Re: an engine question

Posted by Bill Smith on February 02, 2003 at 17:12:59 from (63.147.130.98):

In Reply to: an engine question posted by Billy on February 02, 2003 at 11:11:26:

A 2 cycle (stroke) engine fires everytime the piston is up. A four cycle (stroke) engine only fires every other time the piston is up. Ussually idle speed is referred to as number of RPM's and not number of cycles or strokes. RPM is the number of revolutions of the crankshaft in one minute. Note that 1 complete revolution of the crankshaft is = to 2 cycles or strokes. Number of cycles per minute would be number of RPM's X 2. Most 4 cycle engines have an idle speed of say 600 RPM's as a ball park figure. 600 RPM's would be = to 1200 cycles per minute. For a 2 cycle engine, a cylinder would fire 600 times. For a 4 cycle engine, a cylinder would fire 300 times. Much more simpler and less confusing to just use the number of RPM's. It is very common and is what people are use to referring to.

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