Hey All,

Did you know... that cams lashed at 0,0 or on stock cogs clearance
changes when you adjust them>? the LCA moves, so... the clearance
to the cam lobes change in relationship to TDC. What are the risks
envolved in say adjusting them at 0,0 and setting your lashes
then running them at various settings on the same rocker arm
clearance setting you made at 0,0? I usually ran about +4,-2
or +2,-1 or +2, +3 etc.

any thoughts?

my gut feeling is that in a perfect world... when you adjust cams
and find the right setting you should re-lash them after the cam settings
are found on a bone cold motor anyone with any experience
with this and has good daily driven modified results to share
as well as musings... yet lets try and see if we cant figure this
one out?!

I cant help but feel that doing this wrong can damage LMAs,
Rockers and/or valves. Hence, I think it is a noteworthy question
to ask...

What do yall think? I just want to develop a sound procedure.

Mike





[Modified by MikeSarr_GSR, 8:00 AM 7/25/2002]

 

i dont really think cam timing would change that,ive changed my cam gears around alot and ive checked my valve lash a few times,and i dont see any change at all.Maybe my motor is different Can anyone else confirm this???

 

yea, it kinda a hit or miss concept... but it raised an interesting
question in my mind... just want to be sure!

 

cams should be set to TDC for lash adjustment,

so yeah, they may be a little off, eg 5 degrees max or 1.3% of a 360 degree revolution...

so in a perfect world you could maybe measure this - but in reality even a most skillful operator wont notice such a difference,

let alone be able to compensate for it...

t..

 

see? +3 to +5deg is what we dial into the intake cam to make power
and -1 to -3 is what we can dial into CTR/ITR cams to make more
overlap and more power... so if I adjust them to .007/.008 bone cold
and then dial in these settings, that makes the lash at these settings
to be like .0055/.0085 in my estimation... someone show me how this
can actually pan out at the rocker. no doubt these settings are making
power and bringing in different valve timing. But I think there would be
a neg marginal return if the cams were adjusted at that setting...

I say this:

I know +2 on the intake and -1 on the exhaust on my skunk gear makes
the most power. So, I would go an additional crank degree to +2.5 and -1.5 (+5 and -3) and then I should check the lash here bone cold. If it is in the 005/009
range I will only go back to .0065 and .0075 and drive. This would make the setting more like the +2,-1 I need. Anything over ex.008 and under in.005 is really NOT GOOD... just ask my stock LMAs...

musing, as usual...


[Modified by MikeSarr_GSR, 1:26 PM 7/26/2002]