2si 460

2si 460
Type	Two-stroke aircraft engine
National origin	United States
Manufacturer	2si

The 2si 460 is a family of in-line twin-cylinder, two-stroke, single ignition, aircraft engines that were designed for ultralight aircraft.^[1]

The basic engine was originally designed and produced by JLO of Germany and was later acquired by the AMW Cuyuna Engine Company of Beaufort, South Carolina and marketed under the Cuyuna brand name. Later the engine was marketed by Cuyuna under the Two Stroke International (2si) brand. Cuyuna no longer markets engines for aircraft use although the 460 is still in production as a diesel/multifuel or gasoline industrial, marine and sport vehicle engine.^{[1][2][3][4][5][6][7]}

Development

The 460 is a conventional twin-cylinder engine that weighs 59 lb (27 kg) in its F35 aircraft version. The engine features single capacitor discharge ignition, piston porting, tuned exhaust system, one or two slide venturi-type carburetors, fuel pump, a cast iron cylinder liner, ball, needle and roller bearings throughout. The aircraft version was offered with cog belt drive or a gearbox reduction system. Starting is electric starter or recoil starter.^[1]

Variants

460-F35

Gasoline aircraft engine, single carburetor, 35 hp (26 kW) at 6000 rpm, weight 59 lb (27 kg), out of production.^[1]

460-F40

Gasoline aircraft engine, single carburetor, 40 hp (30 kW) at 6500 rpm, weight 70 lb (32 kg), out of production.^[8]

460-F45

Gasoline aircraft engine, dual carburetors, 45 hp (34 kW) at 6750 rpm, weight 70 lb (32 kg), out of production.^[1]

460 MF

Diesel/multi-fuel engine for marine and industrial applications, 37 hp (28 kW) at 6000 rpm, weight 78.5 lb (36 kg) without gearbox, still in production.^[3]

460F-35

Gasoline industrial engine and sport vehicle engine for auto racing, kart and All-terrain vehicle applications, single carburetor, 35 hp (26 kW) at 6000 rpm, basic weight 55 lb (25 kg), still in production.^[4][7]

460FE-35

Gasoline industrial engine and sport vehicle engine for auto racing, kart and ATV applications with electric start, single carburetor, 35 hp (26 kW) at 6000 rpm, basic weight 55 lb (25 kg), still in production.^[4][7]

460L-50

Gasoline marine engine powering a jet pump, 50 hp (37 kW) at 6750 rpm, still in production.^[5][6]

Applications

• Aero-Works Aerolite 103
• Denney Kitfox
• Fisher Avenger
• RagWing RW1 Ultra-Piet
• RagWing RW2 Special I
• RagWing RW9 Motor Bipe
• Wings of Freedom Flitplane

Specifications (460-F35 aircraft engine)

Data from Cliche^[1]

General characteristics

• Type: Twin-cylinder, two-stroke aircraft engine
• Bore: 69.5 mm (2.74 in)
• Stroke: 60.0 mm (2.36 in)
• Displacement: 455 cc (27.77 cu in)
• Length: 14.5 in (368.30 mm)
• Width: 16.0 in (406.40 mm)
• Height: 16.0 in (406.40 mm)
• Dry weight: 59 lb (27 kg)

Components

• Valvetrain: piston porting
• Fuel type: Minimum 92 octane
• Oil system: premixed oil and fuel
• Cooling system: fan cooled
• Reduction gear: cog belt or optional gearbox

Performance

• Power output: 35 hp (26 kW) at 6000 rpm

See also

• List of aircraft engines
• Hirth 2702
• Rotax 377
  

References

1. ^ ^{a b c d e f} Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page G-2 Cybair Limited Publishing, 2001. ISBN 0-9680628-1-4
2. ^ Two Stroke International (undated). "2si Company Profile". http://www.2si.com/2si_company_profile.htm. Retrieved 2010-02-16. 
3. ^ ^{a b} 2si (undated). "Diesel / Multi-fuel Engine - Model 460 MF - Marine and Industrial Applications". http://www.2si.com/460_mf_spec.htm. Retrieved 2010-02-18. 
4. ^ ^{a b c} 2si (undated). "Engine Models 460F-35 and 460FE-35 Industrial Configuration". http://www.2si.com/460f_460-FE35_ind.htm. Retrieved 2010-02-18. 
5. ^ ^{a b} 2si (undated). "460L-50 Engine & JP-2 Jet Pump Package". http://www.2si.com/460l-50_JP-2_spec.htm. Retrieved 2010-02-18. 
6. ^ ^{a b} 2si (undated). "MARINE ENGINE MODEL 460L-50". http://www.2si.com/marine_engine_mode_460lspec.htm. Retrieved 2010-02-18. 
7. ^ ^{a b c} 2si (undated). "Engine Models 460F-35 and 460FE-35 Sport Configuration". http://www.2si.com/460f_460FE_35%20Sport_%20spec.htm. Retrieved 2010-02-18. 
8. ^ Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 69. BAI Communications. ISBN 0-9636409-4-1