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Two-stroke engines often have a higher power-to-weight ratio than a four-stroke engine, since their power stroke occurs twice as often. Two-stroke engines can also have fewer moving parts, and thus be cheaper to manufacture and weigh less. In countries and regions with stringent emissions regulation, two-stroke engines have been phased out in ...
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]
It is the same simplicity in design, however, that causes a two-stroke engine to be less fuel-efficient and produce high specific levels of undesirable exhaust gas emissions. At the bottom of the power stroke, the transfer ports, which deliver fresh fuel-air mixture, are open at the same time as the exhaust port.
Lubrication is accomplished by adding two-stroke oil to the fuel in small ratios. Petroil refers to the mix of gasoline with the aforesaid oil. This kind of 2-stroke engine has a lower efficiency than comparable 4-strokes engines and releases more polluting exhaust gases for the following conditions:
Bore and Stroke: 66 X 72 mm (2.60 X 2.83 in) Iron Liner 66 X 72 mm (2.60 X 2.83 in) Iron Liner Compression Ratio: 7.5:1 7.7:1 Engine Dry Weight: 26.0 kg, 57.3 lbs 26.0 kg, 57.3 lbs Lubrication: Two-stroke oil/fuel Pre-mix Two-stroke oil/fuel Pre-mix Carburetion: Keihin 34mm PJ05A Keihin 34mm PJ07B Starting: Forward Kick Forward Kick Transmission
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 Fuel Tank Including Reserve
The induction stroke is the first phase in a four-stroke (e.g. Otto cycle or Diesel cycle) engine.It involves the downward movement of the piston, creating a partial vacuum that draws an air-fuel mixture (or air alone, in the case of a direct injection engine) into the combustion chamber.
A Wärtsilä two-stroke marine diesel engine has a bore and stroke of 960 mm × 2,500 mm (37.8 in × 98.4 in), (bore/stroke ratio = 0.384:1). While most modern motorcycle engines are square or oversquare, some are undersquare.
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