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Original Message
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| I'm no cam or distributor wiz, but... |
| By Dave Shoe - 06/24/2003 1:42:51 AM; IP 216.243.176.34 |
I've learned that retarding a camshaft causes the valves to stay open later, and at high revs this allows a more complete intake and exhaust exchange to occur. However, at low RPMs power is lost, since the valves stay open later, resulting in the intake valve staying open well into the compression stroke.
Advancing the cam typically offers no high RPM benefits, but it does close the intake valve closer to BDC, resulting in the compression of more fresh air/fuel each stroke, and thus resulting in a stronger combustion cycle.
Advancing a cam will tend to require the use of higher octane gasoline and will show up as higher numbers on the compression testing gauge. Retarding the cam will simply let the engine rev higher before running out of fresh air.
JMO,
Shoe. |
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