2si 460

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

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

The basic engine was originally designed and produced by ILO-Motorenwerke 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) (discontinued).[1]
460-F40
Gasoline aircraft engine, single carburetor, 40 hp (30 kW) at 6500 rpm, weight 70 lb (32 kg) (discontinued).[8]
460-F45
Gasoline aircraft engine, dual carburetors, 45 hp (34 kW) at 6750 rpm, weight 70 lb (32 kg) (discontinued).[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.[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).[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).[4][7]
460L-50
Gasoline marine engine powering a jet pump, 50 hp (37 kW) at 6750 rpm.[5][6]

Applications

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

References
  1. 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 (n.d.). "2si Company Profile". Archived from the original on 2010-01-15. Retrieved 2010-02-16.
  3. 2si (n.d.). "Diesel / Multi-fuel Engine - Model 460 MF - Marine and Industrial Applications". Archived from the original on 2010-01-15. Retrieved 2010-02-18.
  4. 2si (n.d.). "Engine Models 460F-35 and 460FE-35 Industrial Configuration". Archived from the original on 2010-03-06. Retrieved 2010-02-18.
  5. 2si (n.d.). "460L-50 Engine & JP-2 Jet Pump Package". Archived from the original on 2009-09-01. Retrieved 2010-02-18.
  6. 2si (n.d.). "MARINE ENGINE MODEL 460L-50". Archived from the original on 2013-01-16. Retrieved 2010-02-18.
  7. 2si (n.d.). "Engine Models 460F-35 and 460FE-35 Sport Configuration". Archived from the original on 2013-01-16. Retrieved 2010-02-18.
  8. Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, page 69. BAI Communications. ISBN 0-9636409-4-1
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