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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]
Amount of two-stroke oil injected by the pump depends on the throttle position. A cable from the throttle is connected to the oil pump indicating throttle's position. A tube ensures flow of oil from the reservoir to the oil pump. This system is commonly used for motorcycles as it eliminates the need of pre-mixing fuel and two-stroke oil.
1.0 L (0.22 imp gal; 0.26 US gal) 2 stroke oil The SYM DD50 (also known as the SYM Jolie or City Trek [ 1 ] or in some markets as Super Pure [ citation needed ] ) is a single-cylinder , 49 cc (3.0 cu in), oil injected two-stroke , automatic scooter manufactured by Taiwanese company SYM Motors .
All T-series engines used piston-ported, air-cooled, two-stroke, two-cylinder engines. Lubrication was provided via premix or automatic oil injection depending on the year and model. All models through the 1965 model year were of the premix type while all models from 1966 onwards used automatic oil injection.
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 ...
Diesel engines have the lowest specific fuel consumption of any large internal combustion engine employing a single cycle, 0.26 lb/hp·h (0.16 kg/kWh) for very large marine engines (combined cycle power plants are more efficient, but employ two engines rather than one). Two-stroke diesels with high pressure forced induction, particularly ...
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All models were equipped with "Autolube" automatic oil injection, relieving the user from the need to mix gasoline and two-stroke oil. [2] Rim sizes are 18" WM2 (1.85") front and 18" WM3 (2.15") rear, both being of chromed, wire spoked steel construction. In the UK, rim sizes were 1.60 front and 1.85 rear.