Chain Expansion vs Cam Degree
03-20-2002, 03:12 PM
#1
Chain Expansion vs Cam Degree With a non-stock timing chain, where does the cam get degreed in at?
It has been said that the stock timing chain, under running conditions can stretch enough to retard timing up to 2 deg. Most aftermarket cams have a 2 deg advance grind already in place.
I am assuming that an aftermarket timing chain does not stretch as much, and reduces the timing retard induced by a poor timing chain.
As a result, with a non-stock timing chain, and an aftermarket cam with a 2 deg grind advance, shouldn't the cam be degreed in to retard timing 1 or 2 degrees. Otherwise, it seems to me that you will be running a 2 deg timing advance on a cam that is designed to run with no advance.
So where do I degree my cam in for a cam with a 2 deg advanced grind and an aftermarket timing chain?
It has been said that the stock timing chain, under running conditions can stretch enough to retard timing up to 2 deg. Most aftermarket cams have a 2 deg advance grind already in place.
I am assuming that an aftermarket timing chain does not stretch as much, and reduces the timing retard induced by a poor timing chain.
As a result, with a non-stock timing chain, and an aftermarket cam with a 2 deg grind advance, shouldn't the cam be degreed in to retard timing 1 or 2 degrees. Otherwise, it seems to me that you will be running a 2 deg timing advance on a cam that is designed to run with no advance.
So where do I degree my cam in for a cam with a 2 deg advanced grind and an aftermarket timing chain?
03-21-2002, 07:32 PM
#2
TECH Addict
Re: Chain Expansion vs Cam Degree All timing chains end up with some slack, you probably want to install dot to dot with advance that is ground in cam, in effect. Ls1 studies have shown it doesnt like much advance,G.M. even retards stock cams in some applications. I think it is because of intake runner length and connecting rod to stroke ratio. I would only use 4 degrees advance with real big cam, otherwise 2* should be fine. <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
03-22-2002, 10:46 AM
#4
Re: Chain Expansion vs Cam Degree NoGo,
I had to advance my cam 2.5 degrees with a Cloyes Hex-Adjust timing chain set to get an actual 1 degree retard using the intake centerline method. Combine the 1 degree retard with the 2 degrees advance ground in by Comp Cams and I am really at 1 degree advanced.
John
I had to advance my cam 2.5 degrees with a Cloyes Hex-Adjust timing chain set to get an actual 1 degree retard using the intake centerline method. Combine the 1 degree retard with the 2 degrees advance ground in by Comp Cams and I am really at 1 degree advanced.
John
