Timing Gear Drive

Gear drives, noisy/less noisy. Noisy is usually 20 deg. pressure angle(gear talk). Less noisy is usually 14.5 deg.(stronger). In the real world, as timing chains wear, the camshaft becomes more retarded. One need only look at all the tensioners included at the oem. level to attempt compensation of chain wear and "reverse accelleration", especially prevalent in 4 and 6 cylinder engines,(more room between the cam lobes). Let's look at the long term wear of the gen III hemi chain. I have have heard of straight 30 wt. oil will cause them to slap. Onward, ateam.