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Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.
In four-stroke cycle engines and some two-stroke cycle engines, the valve timing is controlled by the camshaft. It can be varied by modifying the camshaft, or it can be varied during engine operation by variable valve timing. It is also affected by the adjustment of the valve mechanism, and particularly by the tappet clearance.
Kick start is a method of starting an internal combustion engine (usually that of a motorcycle) by pushing a ratcheting lever with the rider's foot. Kick start mechanisms were almost universally a part of motorcycle engines before the mid-1970s, and were phased out of production over the next twenty years or so as electric starters became ...
A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
Pressure in cylinder pattern in dependence on ignition timing: (a) - misfire, (b) too soon, (c) optimal, (d) too late. In a spark ignition internal combustion engine, ignition timing is the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke.
By 1889, Day was working on an engine design that would not infringe the patents that Otto had on the four-stroke [4] and which he would eventually call the Valveless Two-Stroke Engine. In fact there was at least one valve in Joseph Day's original design, a simple check valve in the inlet port communicating directly with the crankcase, where ...
Engine Type Liquid-cooled, single cylinder, two-stroke Displacement 249cc Bore and stroke 70 mm × 64.8 mm (2.76 in × 2.55 in) Compression ratio 7.2 : 1 Lubrication System Fuel and oil premixture of 20 : 1 Carburetion Mikuni VM32SS Transmission Manual Clutch, 5-speed Gearshift Pattern 1-down, 4-up Starter Kick Start
The next commercial engine available (from 1867) was the Otto & Langen a non compression, free piston engine, which used atmospheric pressure for the power stroke, and consumed about half the gas of the Lenoir and Hugon engines. It was in May 1876 that Otto developed his engine using the single-acting four-stroke cycle with compression in the ...