Posted by Brian in Oregon on Thursday, March 22, 2001 at 12:05PM :
In Reply to: Re: Engine rebuild posted by PapaDean on Thursday, March 22, 2001 at 11:18AM :
When you speak of "camming up" and losing bottom end power, what is actually happening is that as the engine breathes better, it becomes more efficient at higher RPM's and less effecient at lower RPM's.
You can compensate for this in one of three ways...
You can install a Cloyes Tru-Roller timing chain that has extra positions on the crank sprocket for advancing or retarding the cam 2 or 4 degrees. I do not know if Cloyes makes a timing chain for the Dodge flatheads.
You can have the cam dowel pin hole drilled oversize and use an offset bushing to move the dowel pin.
If you are having a custom cam ground you can specify to your cam grinder to advance or retard the cam.
Retarding the cam makes the engine breathe better at higher RPM's, with a resultant loss of power in the lower RPM's. Don't want that, because with a 2800 RPM or so redline, extra breathing above this range is wasted.
Advancing the cam increases power in the lower RPM range, at the expense of power at higher RPM's. A four degree advance will give a noticable increase in bottom end torque.
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