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Can someone confirm this..
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[quote][i]Originally posted by SVM 286[/i] [quote][i]Originally posted by Monster[/i] I thought a two stroke engine only sparks every 720 degree's of the crank, hence the name 'two stroke' because it only ignities every 2nd stroke. Proberly wrong though :lol: [/quote] No Monster, a four stroke engine utilises what is known as the 'Otto cycle' that is, induction - compression - ignition - exhaust, the four strokes of the combustion process. Each piston travels the swept volume of the bore and back twice, to complete the cycle. Two up, and two down movements, four in total, hence four strokes. A two stroke engine however completes the process in precisely that, just the two strokes. A lot of 2 stroke units utilise ports rather than valves, this is the case in single cylinder model car engines. They compress and ignite the mixture on one stroke and expel gasses and induce fresh mixture on the other stroke. This is the main reason they are so noisy and smoky, due to the overlap in induction and exhaust and also lubrication being mixed with the fuel. I've probably just confused you more :lol: Sorry. [/quote]
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