Quote:
Speaking of HYD cams, a friend of mine just ran his brand new small block with a Comp Cams Hyd flat tappet cam and wiped 3 lobes. As far as I know he did everything right, adjusted the rockers with the right preload, plenty of break in lube, 20 minute break in period, no problems at first, then started losing power, found a cracked lifter and 3 wiped lobes. What could be the cause of this? I've heard of solid cams having problems lately with the zinc issues but never a hyd. cam?
Scott,
Hydraulic flat tappets have had major issues wiping cams.
Was the rpm's varied during break in ? Did
the lifters fit good so they could rotate with
ease ? Their are a number of things that can cause
this. Their were problems with incorrect lifter face finish
and crown early on, crown of the lifter face helps with
rotation and that could also be one of the causes. I've always
used 0 lash and a 1/2 turn to set preload.
Also to add more about preload, the less preload
you use the more power it frees up due to the
amount of HP it takes to turn the motor over
with hydraulics. Less preload frees the motor
up.
logan426
Last edited by Logan426; 07/23/09 02:19 PM.
