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An engine is described as oversquare or short-stroke if its cylinders have a greater bore diameter than its stroke length, giving a bore/stroke ratio greater than 1:1. An oversquare engine allows for more and larger valves in the head of the cylinder, higher possible rpm by lowering maximum piston speed, and lower crank stress due to the lower ...
For example, motorcycle racing engines can use compression ratios as high as 14.7:1, and it is common to find motorcycles with compression ratios above 12.0:1 designed for 95 or higher octane fuel. Ethanol and methanol can take significantly higher compression ratios than gasoline.
Engine displacement is calculated based on bore, stroke length and the number of cylinders: [1] displacement = π ( 1 / 2 × bore ) 2 × stroke × n cylinders. The stroke ratio, determined by dividing the bore by the stroke, traditionally indicated whether an engine was designed for power at high engine speeds or torque at lower engine ...
The LFV is a direct-injection 1.5 L turbocharged SGE variant, with a 74 mm × 86.6 mm (2.91 in × 3.41 in) bore and stroke for a total capacity of 1,490 cc (1.5 L). Compression ratio is 10.0:1 and the engine can run on regular unleaded-grade gasoline. Maximum engine speed is 6500 rpm. Automatic Start-Stop is available with this engine. Assembly ...
- DXDB-evo2; no kangaroo because is using 2nd air injection for catalyst pre-heating and normal air-fuel mixture. 110 kW (150 PS; 148 bhp) at 5,000 rpm; 250 N⋅m (184 lbf⋅ft) at 1,500–4000 rpm - DNKA-evo2; no kangaroo because is using 2nd air injection for catalyst pre-heating and normal air-fuel mixture.
This action expels the spent air-fuel mixture through the exhaust port. Four-stroke engines are the most common internal combustion engine design for motorized land transport, [1] being used in automobiles, trucks, diesel trains, light aircraft and motorcycles. The major alternative design is the two-stroke cycle. [1]
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The high compression ratio in the auxiliary combustion chamber causes the auto-ignition of the homogeneous lean air-fuel mixture therein (no spark plug required); the burnt gas bursts - through some "transfer ports", just before the TDC - into the main combustion chamber triggering its auto-ignition. The engine needs not be structurally stronger.