[Fot] Valve Lash While Engine is Hot

[Joe Boruch]

Tyler, it was always my understanding that valve lash should be set while the
engine is hot.  You want the specified lash while the engine is running at
operating temperature and the closest way to get that is with a hot engine.

I think some of my earlier cams had lash of 14 and 16, but as the cams got
bigger the lash got bigger.  Yes with bigger clearances you lose some total
lift, but with bigger clearances the valve opens more suddenly and sometimes
engines respond the that.  Bigger lash is also harsher on the valve train as
the parts are moving faster when they come together. Trying different
clearances on a dyno would best determine what the engine wants.  Joe(B)

---------- Original Message ----------
From: "Tylerpthompson at yahoo.com" <Tylerpthompson at yahoo.com>
To: "fot at autox.team.net" <fot at autox.team.net>
Subject: [Fot] Valve Lash While Engine is Hot
Date: Wed, 11 Apr 2012 20:04:26 -0600

My engine has a Paeco TR-6600 cam.  The cam card calls for a .014 intake/.016
exhaust valve lash.  A little looser than stock, but not by much.  I know
folks running larger clearances on the hotter cams and wonder if these
clearances may be a bit too tight.

That said, In talking with a fellow racer tonight who will remain nameless (I
don't want to name him in case I get a lot of back "lash" from this question)
he thought I should ask the FOT group if anyone has measured lash on a hot
motor after a race.  We expect it to be tighter, and perhaps there is an
optimum clearance we should be shooting for.  Just a thought in case my valve
lash is too tight.

Appreciate your input..

Thx

Ty


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