Engineering:Kubota engines

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Kubota engines are diesel and spark ignition engines manufactured by Kubota Corporation. Besides gasoline-fueled for spark ignition engines, the company produces dual fuel, LPG-fueled, and natural-gas-fueled engines as well. The engines are widely used in various forms, such as: agricultural equipments, construction equipments, gensets, tractors, and marine propulsion. Beta Marine,[1] an international company providing marine propulsion engines, uses various Kubota engines for fresh water and sea-going boats of various sizes.

Engine Codes

Kubota has produced a wide variety of engines, from single cylinder to inline six engines; gasoline, dual fuel, LPG, and diesel; from the tiny 0.276 liter Kubota OC60-E to the large 6.1 liter V6108-CR-TI. The company follows a simple naming system for their engines:

1. The first characters mainly specify the engine cylinder configuration; however, in some engines, they also specify fuel type, and cooling system:

Code Feature
E Single cylinder diesel, horizontal, liquid-cooled
Z Two cylinder diesel, inline, vertical, liquid-cooled
D Three cylinder diesel, inline, vertical, liquid-cooled
V Four cylinder diesel, inline, vertical, liquid-cooled
F Five cylinder diesel, inline, vertical, liquid-cooled
S Six cylinder diesel, inline, vertical, liquid-cooled
WG Gasoline fueled, vertical, liquid-cooled
DF Dual-fueled (gasoline and LPG), vertical, liquid-cooled
DG LPG fueled, vertical, liquid-cooled
OC Air/oil-cooled single cylinder diesel, vertical
RD Single cylinder diesel, horizontal, liquid-cooled
  • Note: Exception is for V3 Series. For the engines in these series, the first character denotes the cylinder configuration (4-cylinder inline), the first two digits denote engine series (V3), and than the four numbers following the first character (3xxx) denote engine displacement.

2. The next two numbers specify the engine displacement

3. The next one or two numbers - and "-M" for some engines - specify the engine series:

Code Diesel Engine Series
2 Super Mini Series
05 Super 05 Series
02 02 Series (discontinued)
03 03 Series
03-M 03-M Series
07 07 Series
08 08 Series
09 09 Series (introduced in mid-2017)
Code Gasoline/LPG/Natural Gas Engine Series
2 New Super Mini (NSM) Series, based on the Super Mini Series diesel
05 05 Series, based on the Super 05 Series diesel
03 03 Series, based on the 03 Series diesel
WG3800 Gasoline/LPG/Natural Gas version based on the V3 Series diesel

4. The suffix (separated by a dash or dashes) specifies the features of the engine:

Code Feature
T Turbocharged (without this code means normally-aspirated)
DI Direct injection (without this code means indirect injection)
CR Common-rail direct injection system
I Intercooled
B Emission: early industrial diesel and early gasoline
EB Emission: Tier 1 industrial diesel
E2B Emission: Tier 2 industrial diesel
E3B Emission:

Under 19 kW = Tier 4 industrial diesel;

19 to 56 kW = Tier 4 Interim industrial diesel;

Over 56 kW = Tier 3 industrial diesel

E4B Emission:

Under 19 kW = Tier 4 industrial diesel;

19 to 56 kW = Tier 4 industrial diesel;

Over 56 kW = Tier 4 Interim industrial diesel

BG Emission: earlier diesel generator spec
EBG Emission: Tier 1 diesel generator spec
E2BG Emission: Tier 2 diesel generator spec
E3BG Emission:

Under 19 kW = Tier 4 diesel generator spec;

19 to 56 kW = Tier 4 Interim diesel generator spec;

Over 56 kW = Tier 3 diesel generator spec

E Phase-1 gasoline engine
E2 Phase-2 gasoline engine
G(L)-E3 Phase-3 gasoline engine
  • Note: Sometimes some additional suffixes are added. These suffixes usually denote OEM Name (if the Kubota engines are used by other manufacturers) and Version Number. The numbering and/or character choices used in these suffixes depend on each manufacturer's naming or coding systems.

For Example

  • Z482-E3B

Z = two cylinder inline, liquid-cooled diesel

48 = 480 cc (rounded)

2 = Super Mini Series

No "DI" = indirect injection

No "T" = normally-aspirated

E3B = Tier 4 industrial diesel because Kubota Z482-E3B generates less than 19 kW of power.

  • V2607-DI-T-E3B

V = four cylinder inline, liquid-cooled diesel

26 = 2,600 cc (rounded)

07 = 07 Series

DI = direct injection

T = turbocharged

E3B = Tier 4 Interim because V2607-DI-T-E3B generates less than 56 kW of power.

  • V2403-CR-TIE4B

V = four cylinder inline, liquid-cooled diesel

24 = 2,400 cc (rounded)

03 = 03 Series

CR = common-rail direct injection

T = turbocharged

I = intercooled

E4B = Tier 4 because V2403-CR-TIE4B generates less than 56 kW of power.

  • V3300-T

V (first character) = four cylinder inline, liquid-cooled diesel

V3 (first two digits) = engine series

3300 (four numbers after first character) = engine displacement 3,300 cc (rounded)

No "DI" = indirect injection

T = turbocharged

  • V1505-T-E2B-KSR/VMR/ACP

V = four cylinder inline, liquid-cooled diesel

15 = 1,500 cc (rounded)

05 = Super 05 Series

T = turbocharged

E2B = Tier 2 industrial diesel

KSR = code for Kaeser equipments

VMR = code for Vermeer equipments

ACP = code for Atlas Copco equipments

Gasoline / LPG / Natural Gas

WG/DF/DG Series

Unlike most manufacturers that build their gasoline engines and diesel engines based on different platforms, Kubota builds its gasoline/LPG/NG (natural gas) engines based on its diesel engines. The WG/DF/DG engines are solidly based on Kubota's Super Mini Series, Super 05 Series, 03 Series, and V3 Series diesel engines. This makes most of parts are interchangeable between Kubota's gasoline/LPG/NG engines and diesel engines in the equal engine series.

WG752 / DF752

  • 3-cylinder inline, liquid-cooled (740 cc)
    • Bore x Stroke = 68 mm x 68 mm
    • Max Power / RPM = 24.5 hp (LPG = 23.5 hp) / 3,600 RPM
    • Max Torque / RPM = 5.7 kgm / 2,320 RPM (LPG = 5.4 kgm / 2,400 RPM)
    • Dry Weight = 61.7 kg

WG972-G / WG972-L / WG972-N

  • 3-cylinder inline, liquid-cooled (962 cc)
    • Bore x Stroke = 74.5 mm x 73.6 mm
    • Max Power / RPM = 32.5 hp (LPG = 29.5 hp; NG = 27.4 hp)/ 3,600 RPM
    • Max Torque / RPM = 6.9 kgm / 2,500 RPM (LPG = 6.6 kgm / 1,800 RPM; NG = 6.4 kgm / 2,100 RPM)
    • Dry Weight = 74 kg (LPG/NG = 77 kg)

DG972

  • 3-cylinder inline, liquid-cooled (962 cc)
    • Bore x Stroke = 74.5 mm x 73.6 mm
    • Max Power / RPM = 23.6 hp / 3,600 RPM
    • Max Torque / RPM = 5.7 kgm / 2,500 RPM
    • Dry Weight = 72 kg (with rear end plate) / 95.4 kg (with SAE flywheel and housing)

WG1005 / DF1005

  • 3-cylinder inline, liquid-cooled (996 cc)
    • Bore x Stroke = 75.8 mm x 73.6 mm
    • Max Power / RPM = 32.5 hp (LPG = 31 hp) / 3,600 RPM
    • Max Torque / RPM = 7.14 kgm / 2,160 RPM (LPG = 6.8 kgm / 2,160 RPM)
    • Dry Weight = 93 kg

WG1605-G / WG1605-L / WG1605-N

  • 4-cylinder inline, liquid-cooled (1,537 cc)
    • Bore x Stroke = 79 mm x 78.4 mm
    • Max Power / RPM = 57 hp (LPG = 55 hp; NG = 51.5 hp) / 3,600 RPM
    • Max Torque / RPM = 11.98 kgm / 2,450 RPM (LPG = 12.3 kgm / 2,400 RPM; NG = 11.3 kgm / 2,500 RPM)
    • Dry Weight = 119 kg (LPG/NG = 120 kg)

WG2503-G / WG2503-L / WG2503-N

  • 4-cylinder inline, liquid-cooled (2,491 cc)
    • Bore x Stroke = 88 mm x 102.4 mm
    • Max Power / RPM = 61 hp (LPG = 61.7 hp; NG = 56.9 hp) / 2,700 RPM
    • Max Torque / RPM = 17.54 kgm / 1,950 RPM (LPG = 18.2 kgm / 1,400 RPM; NG = 16.2 kgm / 1,050 RPM)
    • Dry Weight = 212 kg

WG3800-G / WG3800-L / WG3800-N

  • 4-cylinder inline, liquid-cooled (3,769 cc)
    • Bore x Stroke = 100 mm x 120 mm
    • Max Power / RPM = 87.2 hp (LPG = 93.9 hp; NG = 87.2 hp) / 2,600 RPM
    • Max Torque / RPM = 26.4 kgm / 1,400 RPM (LPG = 29.8 kgm / 1,250 RPM; NG = 27.5 kgm / 1,200 RPM)
    • Dry Weight = 288 kg

Diesel

Kubota makes both indirect and direct injection diesel. For the indirect injection system, Kubota's proprietary TVCS (Three Vortex Combustion System) obtains an optimum air/fuel mixture by generating three intense swirling air flows (vortexes) within the spherical-combustion (swirl) chamber. The new TVCS added a special concave recess on the piston head to force compression air in the swirl chamber and to smooth combustion gas exhause. The E-TVCS, based on the new TVCS, is aimed at a drastic emission reduction. E-TVCS produces far less soot, HC and CO thanks to a better match between the injection nozzle throat and the concave recess on the piston head. The injection pump and nozzle are better matched with the combustion chamber to reduce NOx emissions.

As for the direct injection system, Kubota has developed several systems; from the conventional direct injection system (DIS) used in the two-valve per cylinder engine range, E-CDIS (Center Direct Injection System) used in the 3 to 4-valve per cylinder engine range, to the Common-Rail Direct Injection System in the latest generation of Kubota diesels to comply the latest emission regulations. The common-rail direct injection engines may be equipped with Diesel Oxidation Catalyst (DOC) or DOC and Diesel Particulate Filter (DPF).

EA Series

The Kubota EA Series is a single-cylinder, horizontal, liquid-cooled diesel engine. Kubota EA Series engines are mainly used for hand tractors and other agricultural equipment.

EA300-E

  • Single cylinder, horizontal, liquid-cooled diesel (309 cc)
    • Bore x Stroke = 75 mm x 70 mm
    • Max Power / RPM = 7.7 hp / 3,000 RPM

OC Series

The Kubota OC Series is a single-cylinder, vertical, air/oil-cooled diesel engine. Unlike other Kubota engines, Kubota OC Series engines rely on oil and air to cool the engines. There is a cooling fan connected to the crankshaft, also fan shroud and ducting to optimize the cooling system further. The Kubota OC Series engines are usually used for small/portable gensets and other light power applications. Some motorcycle enthusiasts use Kubota OC Series engines to power self-built or self-modified small diesel motorcycles due to the light weight and its simple air/oil cooling system.[2]

OC60-E

  • Single cylinder, vertical, air/oil-cooled diesel (276 cc)
    • Bore x Stroke = 72 mm x 68 mm
    • Max Power / RPM = 6.2 hp / 3,600 RPM

OC95-E

  • Single cylinder, vertical, air/oil-cooled diesel (416 cc)
    • Bore x Stroke = 83 mm x 77 mm
    • Max Power / RPM = 9.5 hp / 3,600 RPM

RD Series

The Kubota RD Series is a single-cylinder, horizontal, liquid-cooled diesel engine. Its liquid cooling system does not use a radiator; instead, it uses a hopper style cooling system, in which, a coolant reservoir is placed directly on the engine. Kubota RD Series engines are in both indirect (TVCS) and direct injection forms.

Kubota RD Series engines are mainly used to power hand tractors, rice mills, and gensets. However, due to their versatility, many Kubota RD Series engines are also used for sawmill, propelling small boats/sampans, and even self-built light "trucks" in rural areas in some Asian countries.

RD65H/RD65T

  • Single cylinder, horizontal, liquid-cooled diesel (376 cc)
    • Bore x Stroke = 80 mm x 75 mm
    • Max Power / RPM = 6.5 hp / 2,200 RPM
    • Max Torque / RPM = 2.26 kgm / 1,800 RPM

RD85DI-1B/RD85DI-2B/RD85DIH-1/RD85DI-1S/RD85DI-2S

  • Single cylinder, horizontal, liquid-cooled diesel (487 cc)
    • Bore x Stroke = 86 mm x 84 mm
    • Max Power / RPM = 8.5 hp / 2,200 RPM
    • Max Torque / RPM = 3.08 kgm / 1,800 RPM

RD110DI-2T/RD110DI-2B/RD110DIH-2

  • Single cylinder, horizontal, liquid-cooled diesel (598 cc)
    • Bore x Stroke = 92 mm x 90 mm
    • Max Power / RPM = 11 hp / 2,400 RPM
    • Max Torque / RPM = 3.92 kgm / 1,700 RPM

RD140DI-2T/RD140DIH-2

  • Single cylinder, horizontal, liquid-cooled diesel (709 cc)
    • Bore x Stroke = 97 mm x 96 mm
    • Max Power / RPM = 14 hp / 2,400 RPM
    • Max Torque / RPM = 5 kgm / 1,600 RPM

Super Mini Series

Kubota developed the world's smallest, multi-cylinder high power density diesel engine series, the Super Mini, in 1983. Starting out with just two models, this series remained a long time favorite for twenty years. In 2003, two new models joined this ever-popular 2-, 3-cylinder series. All Kubota Super Mini Series engines are in indirect injection system (E-TVCS).

The Kubota Super Mini Series engines are mainly used for gensets, small agricultural tractors, lawn mowers, and other light power applications. However, some motorcycle enthusiasts also use them to power self-built or self-modified diesel motorcycles.[3] Aixam, a French automobile manufacturers, uses Kubota Z482 to power some of its micro cars.

Z482

  • 2-cylinder inline, liquid-cooled diesel (479 cc)
    • Bore x Stroke = 67 mm x 68 mm
    • Max Power / RPM = 13.3 hp / 3,600 RPM
    • Max Torque / RPM = 3.06 kgm / 2,600 RPM
    • Dry Weight = 53.1 kg

Z602

  • 2-cylinder inline, liquid-cooled diesel (599 cc)
    • Bore x Stroke = 72 mm x 73.6 mm
    • Max Power / RPM = 16.8 hp / 3,600 RPM
    • Max Torque / RPM = 3.9 kgm / 2,550 RPM
    • Dry Weight = 60 kg


D662

  • 3-cylinder inline, liquid-cooled diesel (656 cc)
    • Bore x Stroke = 64 mm x 68 mm
    • Max Power / RPM = 17.3 hp / 3,600 RPM
    • Max Torque / RPM = unknown
    • Dry Weight = 63.7 kg

D722

  • 3-cylinder inline, liquid-cooled diesel (719 cc)
    • Bore x Stroke = 67 mm x 68 mm
    • Max Power / RPM = 18.8 hp / 3,600 RPM
    • Max Torque / RPM = 5.1 kgm / 2,600 RPM
    • Dry Weight = 63.1 kg

D722-T

Turbocharged version of D722. This engine is available only for military use; however, limited numbers of D722-T are available at military surplus.

  • 3-cylinder inline, liquid-cooled diesel (719 cc)
    • Bore x Stroke = 67 mm x 68 mm
    • Max power, max torque, and dry weight are unknown

D782

  • 3-cylinder inline, liquid-cooled diesel (778 cc)
    • Bore x Stroke = 67 mm x 73.6 mm
    • Max Power / RPM = 18.1 hp / 3,200 RPM
    • Max Torque / RPM = unknown
    • Dry Weight = 63.5 kg


D902

  • 3-cylinder inline, liquid-cooled diesel (898 cc)
    • Bore x Stroke = 72 mm x 73.6 mm
    • Max Power / RPM = 21.6 hp / 3,200 RPM
    • Max Torque / RPM = 5.8 kgm / 2,350 RPM
    • Dry Weight = 72 kg

Super 05 Series

Kubota Super 05 Series engines are mainly for light to medium-light power applications. Small Kubota tractors, medium-sized lawnmowers, small excavators, medium-light gensets, and special vehicles or utility vehicles are usually equipped with Super 05 Series engines. Some kit car builders[4] also use Kubota Super 05 Series engines to build fuel-efficient kit cars that can reach 70 mpg (about 29.7 km/l) in average. Other builders use Kubota Super 05 Series to repower light 4x4 vehicles.[5] In addition, the SHERP amphibious all-terrain vehicle or Sherp ATV is powered by a 1.5 liter turbocharged Kubota V1505-T-E3B. All Kubota Super 05 Series engines are in indirect injection (E-TVCS) system. Available in 3 and 4 cylinder inline configurations.

D905

  • 3-cylinder inline, liquid-cooled diesel (898 cc)
    • Bore x Stroke = 72 mm x 73.6 mm
    • Max Power / RPM = 24.8 hp / 3,600 RPM
    • Max Torque / RPM = 5.8 kgm / 2,500 RPM
    • Dry Weight = 93 kg

D1005

  • 3-cylinder inline, liquid-cooled diesel (1,001 cc)
    • Bore x Stroke = 76 mm x 73.6 mm
    • Max Power / RPM = 27.3 hp / 3,600 RPM
    • Max Torque / RPM = 6.22 kgm / 2,600 RPM
    • Dry Weight = 93 kg

D1105

  • 3-cylinder inline, liquid-cooled diesel (1,123 cc)
    • Bore x Stroke = 78 mm x 78.4 mm
    • Max Power / RPM = 26 hp / 3,000 RPM
    • Max Torque / RPM = 7,2 kgm / 2,100 RPM
    • Dry Weight = 93 kg

D1105-T

  • Turbocharged version of D1105.
    • Bore x Stroke = 78 mm x 78.4 mm
    • Max Power / RPM = 32.8 hp / 3,000 RPM
    • Max Torque / RPM = 9 kgm / 2,000 RPM
    • Dry Weight = 97 kg

V1205

  • 4-cylinder inline, liquid-cooled diesel (1,198 cc)
    • Bore x Stroke = 72 mm x 73.6 mm
    • Max Power / RPM = 33 hp / 3,600 RPM
    • Max Torque / RPM = 7.41 kgm / 2,500 RPM
    • Dry Weight = 110 kg

V1205-T

  • 4-cylinder inline, liquid-cooled diesel (1,198 cc), turbocharged version of V1205
    • Bore x Stroke = 72 mm x 73.6 mm
    • Max Power / RPM = 42.5 hp / 3,600 RPM
    • Max Torque / RPM = 9.15 kgm / 2,500 RPM
    • Dry Weight = 114 kg

D1305

  • 3-cylinder inline, liquid-cooled diesel (1,261 cc). Basically, D1305 is a stroked-up D1105.
    • Bore x Stroke = 78 mm x 88 mm
    • Max Power / RPM = 29.1 hp / 3,000 RPM
    • Max Torque / RPM = 8.16 kgm / 2,000 RPM
    • Dry Weight = 95 kg

V1305

  • 4-cylinder inline, liquid-cooled diesel (1,335 cc)
    • Bore x Stroke = 76 mm x 73.6 mm
    • Max Power / RPM = 36.5 hp / 3,600 RPM
    • Max Torque / RPM = 8.3 kgm / 2,600 RPM
    • Dry Weight = 110 kg

V1505

  • 4-cylinder inline, liquid-cooled diesel (1,498 cc)
    • Bore x Stroke = 78 mm x 78.4 mm
    • Max Power / RPM = 35.5 hp / 3,000 RPM
    • Max Torque / RPM = 9.68 kgm / 2,150 RPM
    • Dry Weight = 110 kg

V1505-T

  • Turbocharged version of V1505.
    • Bore x Stroke = 78 mm x 78.4 mm
    • Max Power / RPM = 44.2 hp / 3,000 RPM
    • Max Torque / RPM = 12 kgm / 2,000 RPM
    • Dry Weight = 114 kg


V1505-CR-T

  • The Kubota V1505-CR-T is the Common-rail Turbocharged version of V1505. Introduced in April 23-28, 2018 at 2018 Intermat in Paris, it features a common-rail electronic fuel injection system, Diesel Oxidation Catalyst (DOC), and Diesel Particulate Filter (DPF). The main target of this new engine are special purpose non-road vehicles/machines such as small earth-moving and municipal machines. Although the main purpose of using common-rail electronic fuel injection, DOC, and DPF is to meet the latest emission standard (Stage V Regulation), there are slight increases in both power and torque as well. The addition of those emissions control systems inevitably increases the dry weight of the engine as much as 55 kg. Kubota V1505-CR-T is planned to be fully mass produced in 2020.
    • Bore x Stroke = 78 mm x 78.4 mm
    • Max Power / RPM = 44.3 hp / 3,000 RPM
    • Max Torque / RPM = 12.1 kgm / 2,000 RPM
    • Dry Weight = 169 kg

02 Series

Kubota 02 Series engines are small to medium sized engines built by Kubota. All Kubota 02 Series engines have 82 mm stroke. Available in 3, 4, 5, and 6 cylinder inline configurations, in both indirect and direct injection systems. This series is now discontinued.

D1102

  • 3-cylinder inline, liquid-cooled diesel (1,116 cc)
    • Bore x Stroke = 76 mm x 82 mm
    • Max Power / RPM = 23.5 hp / 2,600 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = n/a

D1302

  • 3-cylinder inline, liquid-cooled diesel (1,299 cc)
    • Bore x Stroke = 82 mm x 82 mm
    • Max Power / RPM = 27.5 hp / 2,600 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = n/a

D1402-DI

  • 3-cylinder inline, liquid-cooled diesel (1,363 cc)
    • Bore x Stroke = 84 mm x 82 mm
    • Max Power / RPM = 29 hp / 2,600 RPM
    • Max Torque / RPM = 9.1 kgm / n/a
    • Dry Weight = n/a

V1502

  • 4-cylinder inline, liquid-cooled diesel (1,487 cc)
    • Bore x Stroke = 76 mm x 82 mm
    • Max Power / RPM = 33 hp / 2,600 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = n/a

V1702-DI

  • 4-cylinder inline, liquid-cooled diesel (1,732 cc)
    • Bore x Stroke = 82 mm x 82 mm
    • Max Power / RPM = 34 hp / 2,600 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = n/a

V1902

  • 4-cylinder inline, liquid-cooled diesel (1,861 cc)
    • Bore x Stroke = 85 mm x 82 mm
    • Max Power / RPM = 40 hp / 2,600 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = n/a

F2302-DI

  • 5-cylinder inline, liquid-cooled diesel (2,272 cc)
    • Bore x Stroke = 84 mm x 82 mm
    • Max Power / RPM = 50 hp / 2,600 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = n/a

S2602

  • 6-cylinder inline, liquid-cooled diesel (2,598 cc)
    • Bore x Stroke = 82 mm x 82 mm
    • Max Power / RPM = 48 hp / 2,600 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = n/a

S2802

  • 6-cylinder inline, liquid-cooled diesel (2,792 cc)
    • Bore x Stroke = 85 mm x 82 mm
    • Max Power / RPM = 54 hp / 2,600 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = n/a

03 Series and 03-M Series

Kubota 03 Series and 03-M Series engines are mainly used for medium power applications. Medium-sized tractors, construction equipment, gensets, and refrigerated containers are some of them. Some automotive enthusiasts use Kubota 03 Series and 03-M Series engines to power old four-wheelers such as Jeep Willys and CJ2s or 1990's light trucks and SUVs.[6][7] Kubota V2003-T, V2203-DI modified with turbo-intercooler, and V2403-M-T are the popular choices. Their compact size, good torque at low RPM, simplicity, reliability, and fuel efficiency (up to 40-45 mpg (17-19.12 km/l) in average) are the strong points making them ideal for engine-swapping.

The Kubota 03 Series and 03-M Series are available in indirect injection system (E-TVCS), direct injection system (DIS), and Common-Rail Direct Injection System (CR). Naturally-aspirated and turbocharged versions are also available. Kubota 03 Series and 03-M Series are manufactured in inline 3, 4, and 5 cylinder configurations. All Kubota 03 Series and 03-M Series engines have 92.4 mm stroke, except D1803s and V2403s that have 102.4 mm stroke; which is basically a stroked-up design of the original 03 and 03-M Series. Cylinder bores are 80, 83, and 87 mm.

The Kubota 03 Series and 03-M Series engines also offer side power take-off (PTO), in response to the trend of increasing hydraulic control devices in industrial machines. It is possible to install a hydraulic pump at two side PTO locations.

D1403

  • 3-cylinder inline, liquid-cooled diesel (1,393 cc)
    • Bore x Stroke = 80 mm x 92.4 mm
    • Max Power / RPM = 31 hp / 2,800 RPM
    • Max Torque / RPM = 9.5 kgm / 1,700 RPM
    • Dry Weight = 148 kg

D1503-M

  • 3-cylinder inline, liquid-cooled diesel (1,499 cc)
    • Bore x Stroke = 83 mm x 92.4 mm
    • Max Power / RPM = 31.9 hp / 2,800 RPM
    • Max Torque / RPM = 9.8 kgm / 1,600 RPM
    • Dry Weight = 148 kg

D1503-M-DI

  • Direct injection version of D1503-M
    • Bore x Stroke = 83 mm x 92.4 mm
    • Max Power / RPM = 33.2 hp / 2,800 RPM
    • Max Torque / RPM = 9.8 kgm / 1,600 RPM
    • Dry Weight = 148 kg

D1503-M-DI-T

  • Direct injection turbocharged version of D1503-M
    • Bore x Stroke = 83 mm x 92.4 mm
    • Max Power / RPM = 43.8 hp / 2,800 RPM
    • Max Torque / RPM = 12.4 kgm / 1,600 RPM
    • Dry Weight = 152 kg

D1703-M

  • 3-cylinder inline, liquid-cooled diesel (1,647 cc)
    • Bore x Stroke = 87 mm x 92.4
    • Max Power / RPM = 35 hp / 2,800 RPM
    • Max Torque / RPM = 10.7 kgm / 1,700 RPM
    • Dry Weight = 148 kg

D1703-M-DI

  • Direct injection version of D1703-M
    • Bore x Stroke = 87 mm x 92.4 mm
    • Max Power / RPM = 36.7 hp / 2,800 RPM
    • Max Torque / RPM = 10.7 kgm / 1,700 RPM
    • Dry Weight = 148 kg

D1803-M

  • 3-cylinder inline, liquid-cooled diesel (1,826 cc)
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 37.4 hp / 2,700 RPM
    • Max Torque / RPM = 11.73 kgm / 1,600 RPM
    • Dry Weight = 151 kg

D1803-M-DI

  • Direct injection version of D1803-M
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 38.1 hp / 2,700 RPM
    • Max Torque / RPM = 11.8 kgm / 1,650 RPM
    • Dry Weight = 151 kg

D1803-CR

  • Common-rail version of D1803-M-DI
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 37.5 hp / 2,700 RPM
    • Max Torque / RPM = 11.83 kgm / 1,600 RPM
    • Dry Weight = 185 kg

D1803-CR-T

  • Turbocharged version of D1803-CR with DPF and DOC
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 49.6 hp / 2,700 RPM
    • Max Torque / RPM = 15.35 kgm / 1,600 RPM
    • Dry Weight = 196 kg

D1803-CR-TI

  • Intercooled version of D1803-CR-T with DOC
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 49.6 hp / 2,700 RPM
    • Max Torque / RPM = 15.35 kgm / 1,600 RPM
    • Dry Weight = 195 kg

V1903

  • 4-cylinder inline, liquid-cooled diesel (1,857 cc)
    • Bore x Stroke = 80 mm x 92.4 mm
    • Max Power / RPM = 41.6 hp / 2,800 RPM
    • Max Torque / RPM = 13.1 kgm / 1,700 RPM
    • Dry Weight = 180 kg

V2003

  • 4-cylinder inline, liquid-cooled diesel (1,999 cc)
    • Bore x Stroke = 83 mm x 92.4 mm
    • Max Power / RPM = 43.7 hp / 2,800 RPM
    • Max Torque / RPM = 13.3 kgm / 1,750 RPM
    • Dry Weight = 180 kg

V2003-T

  • Turbocharged version of V2003.
    • Bore x Stroke = 83 mm x 92.4 mm
    • Max Power / RPM = 59.7 hp / 2,800 RPM
    • Max Torque / RPM = 17.3 kgm / 1,800 RPM
    • Dry Weight = 184 kg

V2003-M-T

  • 03-M Series turbocharged version of V2003.
    • Bore x Stroke = 83 mm x 92.4 mm
    • Max Power / RPM = 59.7 hp / 2,800 RPM
    • Max Torque / RPM = 17.3 kgm / 1,800 RPM
    • Dry Weight = 184 kg

V2203

  • 4-cylinder inline, liquid-cooled diesel (2,197 cc)
    • Bore x Stroke = 87 mm x 92.4 mm
    • Max Power / RPM = 49 hp / 2,800 RPM
    • Max Torque / RPM = 14.7 kgm / 1,600 RPM
    • Dry Weight = 180 kg

V2203-DI

  • Direct injection version of V2203.
    • Bore x Stroke = 87 mm x 92.4 mm
    • Max Power / RPM = n/a
    • Max Torque / RPM = n/a
    • Dry Weight = 180 kg

V2403-M

  • 4-cylinder inline, liquid-cooled diesel (2,434 cc)
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 48.9 hp / 2,700 RPM
    • Max Torque / RPM = 16.2 kgm / 1,600 RPM
    • Dry Weight = 184 kg

V2403-M-T

  • Turbocharged version of V2403-M.
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 59 hp / 2,700 RPM
    • Max Torque / RPM = 16.93 kgm / 1,900 RPM
    • Dry Weight = 188 kg

V2403-CR-T

  • Common-rail version of V2403-M-T with DPF and DOC.
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 65.1 hp / 2,700 RPM
    • Max Torque / RPM = 20.2 kgm / 1,650 RPM
    • Dry Weight = 233 kg

V2403-CR-TI

  • Common-rail intercooled version of V2403-M-T with DOC.
    • Bore x Stroke = 87 mm x 102.4 mm
    • Max Power / RPM = 65.1 hp / 2,700 RPM
    • Max Torque / RPM = 20.2 kgm / 1,650 RPM
    • Dry Weight = 232 kg

F2503-DI

  • 5-cylinder inline, direct injection liquid-cooled diesel (2,499 cc)
    • Bore x Stroke = 83 mm x 92.4 mm
    • Max Power / RPM = 53 hp / 2,800 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = 223 kg

F2503-T

  • 5-cylinder inline, turbocharged liquid-cooled diesel (2,499 cc)
    • Bore x Stroke = 83 mm x 92.4 mm
    • Max Power / RPM = 75.6 hp / 2,800 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = 227 kg

F2803

  • 5-cylinder inline, liquid-cooled diesel (2,746 cc)
    • Bore x Stroke = 87 mm x 92.4 mm
    • Max Power / RPM = 62 hp / 2,800 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = 223 kg

F2803-DI

  • Direct injection version of F2803
    • Bore x Stroke = 87 mm x 92.4 mm
    • Max Power / RPM = 64 hp / 2,800 RPM
    • Max Torque / RPM = n/a
    • Dry Weight = 223 kg

07 Series

The Kubota 07 Series is a totally new concept in engine design developed with various requirements necessary for a wide range of industrial applications. The engine package is smaller than that of the current 2.4L engine but yet the displacement is larger. The improved cooling system with a main water gallery and water passages between cylinder bores as a countermeasure against heat load provides high power density, superior endurance and a reliable Kubota 07 Series. The Kubota 07 Series completes Kubota’s seamless range up to 100 hp.

The New Kubota 07 Series engines have been designed to comply with EPA Interim Tier 4 (Option1) emissions regulations, which are the most stringent in this size range. Meeting emission regulations with minimal additional required devices: NOx is reduced only by mechanical means such as a compactly designed cooled exhaust gas recirculation (EGR) system.

Kubota’s original E-CDIS (Center Direct Injection System) combustion system, renowned for clean combustion in the Kubota V3 (DI) Series, has been renovated. The fuel injection pressure was increased and the combustion chamber was redesigned to achieve a 25% lower particulate matter (PM) level, resulting in a better condition when compared to engines that only meet EPA Tier 3 regulations in this class.

These new engines have been designed to reduce transmitted vibrations and radiated sound, resulting in lower noise levels.

A Side PTO option is available. This engine offers power take-off (PTO) from a gear train located on the flywheel side designed for compact positioning of PTO hydraulic devices. Fan positions are available in two heights to adapt to various equipment configurations.

V2607-DI-T

  • 4-cylinder inline, turbocharged liquid-cooled diesel (2,615 cc)
    • Bore x Stroke = 87 mm x 110 mm
    • Max Power / RPM = 66 hp / 2,700 RPM
    • Max Torque / RPM = 22.43 kgm / 1,600 RPM
    • Dry Weight = 235 kg

V3007-DI-T

  • 4-cylinder inline, turbocharged liquid-cooled diesel (3,053 cc)
    • Bore x Stroke = 94 mm x 110 mm
    • Max Power / RPM = 65 hp / 2.600 RPM
    • Max Torque / RPM = 22.54 kgm / 1,650 RPM
    • Dry Weight = 263 kg

V3307-DI-T

  • 4-cylinder inline, turbocharged liquid-cooled diesel (3,331 cc)
    • Bore x Stroke = 94 mm x 120 mm
    • Max Power / RPM = 74.3 hp / 2.600 RPM
    • Max Torque / RPM = 27 kgm / 1,400 RPM
    • Dry Weight = 268 kg

V3 Series

The Kubota V3 Series engines are available in both naturally aspirated and turbocharged induction systems. The V3 Series also available in indirect injection, direct injection, and common-rail direct injection. For the indirect injection system, Kubota uses E-TVCS (Three Vortex Combustion System) that has been improved. The airflow, combustion chamber and piston recess were optimized to provide a 25% lower particulate matter (PM) level. For the direct injection system, Kubota uses E-CDIS (Center Direct Injection System) with the injector at the center of the cylinder head. The latest V3 Series generation uses Common-Rail Direct Injection to meet the latest emission regulations.

Available only in 4-cylinder inline configuration, Kubota V3 Series engines are mainly used for gensets, medium-large tractors, medium-large construction equipment, forklifts, and special vehicles. Fan positions are available in two heights to adapt to various equipment configurations.

V3300

  • 4-cylinder inline, liquid-cooled diesel (3,318 cc)
    • Bore x Stroke = 98 mm x 110 mm
    • Max Power / RPM = 73 hp / 2,600 RPM
    • Max Torque / RPM = 24 kgm / 1,400 RPM
    • Dry Weight = 241 kg

V3300-T

  • Turbocharged version of V3300.
    • Bore x Stroke = 98 mm x 110 mm
    • Max Power / RPM = 87.4 hp / 2,600 RPM
    • Max Torque / RPM = 29 kgm / 1,400 RPM
    • Dry Weight = 250 kg

V3600

  • 4-cylinder inline, liquid-cooled diesel (3,620 cc)
    • Bore x Stroke = 98 mm x 120 mm
    • Max Power / RPM = 66.8 hp / 2,600 RPM
    • Max Torque / RPM = 22.6 kgm / 1,700 RPM
    • Dry Weight = 264 kg

V3600-T

  • Turbocharged version of V3600.
    • Bore x Stroke = 98 mm x 120 mm
    • Max Power / RPM = 84.5 hp / 2,600 RPM
    • Max Torque / RPM = 30.4 kgm / 1,550 RPM
    • Dry Weight = 275 kg

V3800-DI-T

  • 4-cylinder inline, turbocharged liquid-cooled diesel (3,769 cc)
    • Bore x Stroke = 100 mm x 120 mm
    • Max Power / RPM = 99.2 hp / 2,600 RPM
    • Max Torque / RPM = 33.4 kgm / 1,550 RPM
    • Dry Weight = 288 kg

V3800-CR-T

  • Common-rail version of V3800-DI-T.
    • Bore x Stroke = 100 mm x 120 mm
    • Max Power / RPM = 99.9 hp / 2,600 RPM
    • Max Torque / RPM = 34.5 kgm / 1,500 RPM
    • Dry Weight = 345 kg

V3800-CR-TI

  • Common-rail intercooled version of V3800-DI-T
    • Bore x Stroke = 100 mm x 120 mm
    • Max Power / RPM = 114 hp / 2,600 RPM
    • Max Torque / RPM = 38.3 kgm / 1,500 RPM
    • Dry Weight = 345 kg

08 Series

Kubota 08 Series engine is the largest diesel engine manufactured by Kubota. This engine uses Common-Rail Direct Injection System and 4-valve per cylinder. Turbo and intercooler are standard features. Kubota 08 Series is available only in 4-cylinder inline configuration. Kubota 08 Series engines are used for the large tractors lineup.

V6108-CR-TI

  • 4-cylinder inline, liquid-cooled common-rail direct injection turbo-intercooled diesel (6,124 cc). Up to now, V6108-CR-TI is the largest engine manufactured by Kubota.
    • Bore x Stroke = 118 mm x 140 mm
    • Max Power / RPM = 130 hp, 150 hp, or 170 hp (depends on the engine trim, with 20 hp, 20 hp, and 5 hp power boost respectively) / 2,200 RPM
    • Dry Weight = n/a

09 Series

Kubota 09 Series engine is the latest generation diesel engine manufactured by Kubota by 2017. This engine uses Common-Rail Direct Injection System and 4-valve per cylinder. Turbo and intercooler are standard features. Kubota 09 Series is available only in 4-cylinder inline configuration. Despite of the smaller displacement than the 08 Series engine, the 09 Series generates more power than the 08 Series. Kubota 09 Series engines are used for the large tractors lineup.

V5009-CR-TI

  • 4-cylinder inline, liquid-cooled common-rail direct injection turbo-intercooled diesel (5,000 cc). Up to now, V5009-CR-TI is the second largest engine manufactured by Kubota. However, V5009-CR-TI is the most powerful engine manufactured by Kubota despite of the smaller displacement than V6108-CR-TI.
    • Bore x Stroke = n/a
    • Max Power / RPM = 210.9 hp / 2,200 RPM
    • Dry Weight = n/a

References

  1. ↑ Beta Marine "Beta Marine US Ltd.", 2016.
  2. ↑ DieselBike.net Forum "Honda Rebel Kubota", March 13, 2015.
  3. ↑ DieselBike.net Forum "Kubota Z482 Engine - Low compression", September 19, 2011.
  4. ↑ McCornack, Jack. "MAX: Mother's Automotive eXperiment (a high mileage homebuilt for Mother Earth News), 2008.
  5. ↑ OrangeTractorTalks Forum "Repowered My Jeep with Kubota Turbodiesel", September 3, 2012.
  6. ↑ Bourdon, Stuart. "Diesel Swaps: What About A Kubota? Here's How It Can Be Done", April 27, 2015.
  7. ↑ Diesel Bombers Forum "1999 Jeep Wrangler V2203 Build Overview", April 11, 2014.

External links




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