Cam timing? - Team Camaro Tech
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post #1 of 3 (permalink) Old Jul 16th, 03, 11:42 PM Thread Starter
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Denis
 
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I learned this week all about ignition timing, vacuum advance, centrifugal advance, ported vs. manifold vacuum, etc.

One item that is seldom mentioned is cam timing.

Two questions come to mind:

What is the effect of cam timing on the timing curve or, more specifically, on what I'm seeing or setting with my timing light?


Is there a way to tell, externally without removing the timing cover, if a given cam was installed with any advance?

Final question: Do any of my questions even make sense?

[ 07-17-2003, 02:20 AM: Message edited by: deejaygee ]
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post #2 of 3 (permalink) Old Jul 17th, 03, 02:43 AM
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John
 
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Cam timing and ignition timing are two different animals. Cam timing has to do with when the valves open and close in relation to crankshaft position, or, more importantly, where the piston is in the cylinder. A change in cam timing will not affect your ignition curve, or the readings with a timing light.

To find out if a cam is advanced or retarded, you'll need to mount a degree wheel on the engine, find TDC, and rig up a dial indicator on a lifter or push rod. You can do it with the front cover on, but it's a lot easier with the engine out of the car.

John
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post #3 of 3 (permalink) Old Jul 17th, 03, 07:31 AM Thread Starter
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Denis
 
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Got it. Thanks.
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