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Old 01-29-2019, 07:57 PM
darbikrash darbikrash is offline
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Join Date: Oct 2012
Location: So. California
Posts: 381
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Quote:
Originally Posted by Colin70TA View Post
I just finished degreeing my OLD faithful cam (which I had to advance 4 degrees to get at a 107.5 ICL). Confirmed top dead with a dial indicator. Went to install the timing cover and balancer and the TDC timing mark on my Pioneer balancer is lining up at 4 degrees before. Does this make sense? Should I just mark the balance to make a new reference to zero?
I am positive I did TDC right, took measurements on 0.200 on either side of TDC and recorded on degree wheel and found top dead that way.
Just did this degreeing in my stroker 400 using an OF 2 cam ground on a 112 LSA. I used a dial indicator as well, and found it about 4 degrees off. I messed with it for hours, and switched to a hard stop on the top of the cylinder bore to set TDC instead of the dial indicator.

Results within 1/2 degree. Put the balancer on and it was also within 1/2 degree.

The hard stop (metal strap across the cylinder bore with a bolt in the center as a stop) method is more accurate than using dial indicator, this is because at or near TDC the crank can rotate a few degrees with the piston not moving much due to dwell.

Try it with a hard stop and see if things change.

__________________
1964 Catalina 2+2 4sp, 421 Tri-power
1965 GTO, Roadster Shop chassis, 461, Old Faithful cam, KRE heads 305 CFM,
Holley EFI, DIS ignition.
1969 GTO 467, Edelbrock 325 CFM, Terminator EFI
1969 Firebird Convertible
 


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