Well that makes sense.
Just as the lift of the valve is altered by the different rocker ratio, then
so will be the "lost movement" in the clearance.
Interesting discussion!
Guy
----- Original Message -----
From "David Lieb" <dbl at chicagolandmgclub.com>
To: "Guy Weller" <Guy.Weller@kencomp.net>; "Spridget List"
<spridgets@autox.team.net>
Sent: Friday, April 16, 2004 4:21 PM
Subject: Re: valve lash
> No, it isn't measuring the actual cam clearance. It is, however, a
> convenient place to measure. Therefore, the numbers that are published for
> this set the correct clearance for the cam, ASSUMING that you still have
the
> original ratio of rocker arms. This number changes if you change the
rocker
> arm ratio. According to Vizard, this number is derived by multiplying the
> desired cam clearance by the ratio of the arm, therefore, if .012" is the
> correct lash with a 1.25:1 ratio arm, then dividing the .012 by 1.25
yields
> .0096 as the cam clearance, multiplying this by the 1.5 ratio yields a
> "corrected clearance" of .0144 for the same cam when running 1.5:1 rocker
> arms. Since .01" is probably the original cam clearance number (I doubt
that
> it was really .0096), the correct amount of lash should probably be .015".
> David Lieb
> 1972 RWA Midget
> 2002 GTI for Trish to beat me at autocross with
|