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  #171  
Old 4 Weeks Ago
260Alpine 260Alpine is offline
Third Gear
 
Join Date: Jul 2011
Location: Sequim,WA
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Mike, Cam gear is twice as big as crank gear. Crank gear goes around twice for every time the cam gear goes around once. Open and Close are in crank degrees. ATDC= After Top Dead center. BTDC=Before Top Dead Center. Same for Bottom Dead Center. I think offset key 2 degrees for cam would be easiest. One way would be 4 advance crank degrees, flipped around would be 4 degrees retarded. Another thing to be careful about is, at 10 degrees advance the intake valve is closest to the piston. 10 degrees retarded the exhaust valve is closest to the piston. 10 to 1 or more, even at 4 degrees you should check piston to valve clearance.
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Last edited by 260Alpine : 4 Weeks Ago at 10:03 AM.
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  #172  
Old 4 Weeks Ago
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MikeH MikeH is offline
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Location: Green Cove Springs Florida
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It all still goes back to why wasn't this an issue with past conversions.

Think I finally found something to clear it up.

Remember: The camshaft angle is half of the crankshaft angle, therefore the camshaft will correspondingly advance or retard 1░, 2░, 3░, or 4░.

So moving the cam gear one tooth (5.3 degrees) changes the timing 10.6 degrees at the crank.

Found in the article below.

http://www.compcams.com/(S(yyboabakn.../COMP4-153.pdf
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Last edited by MikeH : 4 Weeks Ago at 10:52 AM.
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  #173  
Old 3 Weeks Ago
V6 JOSE V6 JOSE is offline
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Hi Mike,

There hasn't been a problem with this cam, because there is nothing wrong with it. The problems are because of other reasons. I can't exactly diagnose the problem, because I'm not there to see it for myself, but I can tell you for a fact, the cam is not the problem. Rich Gordon told me a month ago, that he can actually idle his engine down to 600 rpm if he wants. He runs his at 800 rpm, because that is where it should idle.

I would venture to guess it is because of engine assembly.


Quote:
Originally Posted by MikeH View Post
It all still goes back to why wasn't this an issue with past conversions.

Think I finally found something to clear it up.

Remember: The camshaft angle is half of the crankshaft angle, therefore the camshaft will correspondingly advance or retard 1░, 2░, 3░, or 4░.

So moving the cam gear one tooth (5.3 degrees) changes the timing 10.6 degrees at the crank.

Found in the article below.

http://www.compcams.com/(S(yyboabakn.../COMP4-153.pdf
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