OK, what the heck am I doing wrong?

[Alan Roehrich]

Originally Posted by eddie c

Art; I thought that I understood this,but now I am confused. You state 10 crank degrees equal 20 cam degrees. Since the cam moves half of the crank,wouldn't 10 crank degrees equal 5 cam degrees? help to explain
this please. ed

You're changing the relationship between the camshaft and the crankshaft.

You don't really measure "cam degrees". Everything in an engine measures in "crank degrees".

The cam moves slower than the crank, so, if you retard the cam 10 degrees by moving the cam gear a tooth, the cam falls behind by 20 degrees, since it moves at 1/2 speed.