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Unlike a four-stroke engine, the crankcase of which is closed except for its ventilation system, a two-stroke engine uses the crankcase as part of the induction tract, so oil must be mixed with gasoline to be distributed throughout the engine for lubrication. [1] The resultant mix is referred to as premix or petroil. [2]
This system is commonly used for motorcycles as it eliminates the need of pre-mixing fuel and two-stroke oil. Vespa is an example where pre-mixing of two-stroke oil is required. Automatic lubrication was introduced for motorcycles by Velocette in 1913. [1] An example of application of automatic lubrication system is Suzuki AX100 motorcycle. The ...
The D-400 series engine or the Iron Horse engine was a light-duty two-stroke engine used for powering lawnmowers produced from the 1950s to the late 1970s. D-400 engines were single-cylinder engines designed and manufactured by the Outboard Marine Corporation (OMC; Johnson and Evinrude) for Lawn-Boy [2] and Masport. The D-400 engines displaced ...
The bulbous shape of the exhaust of the Cornet and Boss is an anti-noise two-stroke TWN feature. All TWN motorcycle production ceased in 1957. In 1953 TWN showed the model Duplex at a fair. This 250 cm 3 engine was a 2-cylinder split-single with 4 pistons. This motorcycle was not produced.
Data from Cuyuna & McCornack General characteristics Type: Direct drive two-stroke piston aircraft engine Bore: 2.658 in (68 mm) Stroke: 2.362 in (60 mm) Displacement: 428 cc (26.11 cubic inches) Dry weight: 65 lb (29 kg) Designer: McCornack/Cuyuna Components Fuel type: Regular auto fuel Oil system: 40:1 premixed fuel and oil Cooling system: fan forced air Performance Power output: 30 hp (22 ...
A lag of about 85 deg for the peak suction wave versus about 32 deg for the peak pressure wave. A difference of some 53 deg due to the movement of the gas and piston position. The graph above shows the intake runner pressure over 720 crank degrees of an engine with a 7-inch (180 mm) intake port/runner running at 4500 rpm, which is its torque ...
The reduction drive system available is the G-50 gearbox, with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1, with a cog-belt reduction drive optional. [ 1 ] [ 2 ] The engines run on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil, or optionally oil injection.
Modern two-stroke engines use either Schnuerle scavenging (also known as "loop scavenging") or uniflow scavenging. The scavenge or scavenging port refers to that port through which clean air enters the cylinder, the exhaust port through which the combustible mix leaves.