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The 2si 690 is a family of in-line three cylinder, liquid-cooled,
two-stroke A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a Thermodynamic power cycle, power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being comple ...
, dual ignition,
aircraft engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many ...
s that were designed for
ultralight aircraft Ultralight aviation (called microlight aviation in some countries) is the flying of lightweight, 1- or 2-seat fixed-wing aircraft. Some countries differentiate between weight-shift control and conventional three-axis control aircraft with ailer ...
.Cliche, Andre: ''Ultralight Aircraft Shopper's Guide'' 8th Edition, page G-3 Cybair Limited Publishing, 2001. The basic engine was originally designed and produced by JLO-Motorenwerke of
Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...
and was later acquired by the
AMW Cuyuna Engine Company 2si was an American engine manufacturer located in Beaufort, South Carolina. The company was a wholly owned subsidiary of the AMW Cuyuna Engine Company, formerly known as the ''Cuyuna Development Company''.Cliche, Andre: ''Ultralight Aircraft S ...
of
Beaufort, South Carolina Beaufort ( , a different pronunciation from that used by the city with the same name in North Carolina) is a city in and the county seat of Beaufort County, South Carolina, United States. Chartered in 1711, it is the second-oldest city in South ...
and marketed under the ''Cuyuna'' brand name. Later the engine was marketed by Cuyuna under the
Two Stroke International 2si was an American engine manufacturer located in Beaufort, South Carolina. The company was a wholly owned subsidiary of the AMW Cuyuna Engine Company, formerly known as the ''Cuyuna Development Company''.Cliche, Andre: ''Ultralight Aircraft S ...
(2si) brand. Cuyuna no longer markets engines for aircraft use although the 690 is still in production as an industrial and marine engine.


Development

The 690 is a conventional three-cylinder engine that weighs in its L70 aircraft and marine versions. The aircraft engine features dual
capacitor discharge ignition Capacitor discharge ignition (CDI) or thyristor ignition is a type of automotive electronic ignition system which is widely used in outboard motors, motorcycles, lawn mowers, chainsaws, small engines, turbine-powered aircraft, and some cars. It w ...
(single in the marine and industrial versions), reed valve porting, tuned exhaust system, three slide venturi-type
carburetor A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meteri ...
s, liquid cooling, fuel pumps, a cast iron cylinder liner, ball, needle and roller bearings throughout. The aircraft version was offered with an optional gearbox reduction dive system and a centrifugal clutch. The current industrial and marine version has an available gearbox with ratios of 2.04, 2.65 or 3.06:1. Starting is electric start only.


Variants

;690-L70 aircraft engine :Gasoline aircraft engine with triple carburetors, at 6250 rpm, weight , out of production. ;690L-70 industrial and marine engine :Gasoline industrial and marine engine, triple carburetors, at 6250 rpm, weight , electric starter mounted on the accessory cover end. Still in production. ;690AL-70 industrial and marine engine :Gasoline industrial and marine engine, triple carburetors, at 6250 rpm, weight , electric starter mounted on the power take-off end. Still in production.


Applications

;Aircraft *
RagWing RW11 Rag-A-Bond The RagWing RW11 Rag-A-Bond is a two-seat, high wing, strut-braced, conventional landing gear, single engine homebuilt aircraft designed by Roger Mann and sold as plans by RagWing Aircraft Designs for amateur construction.Downey, Julia: ''1999 ...
*
RagWing RW19 Stork The RagWing RW19 Stork is a family of two-seat, high wing, strut-braced, conventional landing gear, single-engine homebuilt aircraft designed by Roger Mann and sold as plans by RagWing Aircraft Designs for amateur construction.Downey, Julia: '' ...
*
RagWing RW22 Tiger Moth The RagWing RW22 Tiger Moth is a two-seats-in-tandem, biplane, conventional landing gear, single engine homebuilt aircraft designed by Roger Mann and sold as plans by RagWing Aircraft Designs for amateur construction.Downey, Julia: ''2001 Kit ...
*
Sky Science PowerHawk The Sky Science PowerHawk is a British powered parachute that was designed and produced by Sky Science Powered Parachutes Limited of Tidworth. Now out of production, when it was available the aircraft was supplied as a kit for amateur constru ...
*
St Andrews Viking The St Andrews Viking is a family of American powered parachutes that was designed and manufactured by St Andrews Aviation of Panama City, Florida and later produced by Viking Aircraft Inc., also of Panama City.Cliche, Andre: ''Ultralight Ai ...
*
Viking Aircraft Viking II The Viking Aircraft Viking II is an American powered parachute designed and produced by Viking Aircraft Inc of Panama City Beach, Florida; part of the ''Viking''-series. Now out of production, when it was available the aircraft was supplied c ...


Specifications (690-L70 aircraft engine)


See also


References

{{2si Two-stroke aircraft piston engines Straight-three engines