[T3] Further research and experimenting material!

[Hal Sullivan <tristessa@pon.net>]

<x-flowed>At 08:32 PM 11/6/01 -0600, Jim Adney wrote:
>The way I see it, however, the biggest contribution comes from the
>differental thermal expansion of the various parts and the fact that
>the cylinders and head studs are steel while the pushrods are
>aluminum (which expands 3x as much as steel.)

Now *this* I want to check out.  I'm using chromoly pushrods in one of my 
aircooled VWs --  I'm going to have to start measuring my valve lash both 
cold and hot, keep a chart of what I find.

I've heard theories that the reason for the valve clearance is due to the 
different expansion rate of the aluminum pushrods relative to the rest of 
the engine.  Following that theory, chromoly pushrods should expand at the 
same rate (or nearly so).  If that's the case, would the 004/.006 clearance 
be as necessary in engines that use chromoly pushrods?

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