Re: Stroke

Posted by MMB on August 22, 2004 at 18:29:11 from (64.42.242.2):

In Reply to: Stroke posted by Martin on August 22, 2004 at 14:59:51:

Actually, every "stroke" is one-half of a full revolution of the crankshaft, for example a 4-stroke engine is really two full revolutions of the crankshaft .... the intake is one-half of a revolution, followed by the compression, followed by the power stroke (after the fuel/air mixture is ignited), followed by the exhaust stroke. In a 2-stroke engine, things are generally condensed somewhat with a lot of overlap. The first stroke (1/2 revolution) combines the last power stroke with an intake stroke (of the next sequence), while the second stroke (1/2 revolution) combines the last power stroke with the next intake stroke. Two stroke engines are usually less efficient with their exhaust emmissions being somewhat less environmentally friendly since less of the fuel being delivered into the system gets totally burned during the power stroke (and is into the exhaust of the exhaust stroke). That's the reason why so many lakes, etc. ban 2-stroke boat engines since so much unburned fuel is expelled into the water.

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