RE: 044 magnums

["Jim Adney" <jadney@vwtype3.org>]

On 26 Jun 00, at 12:05, Jake Kooser wrote:

> 0.000" valve clearance, Toby?  Is that a typo, or are you using some
> space-shuttle material pushrods with no expansion here?

I agree that this is a bit confusing. Normally, both the pushrods and 
the cylinders heat up and lengthen, but the pushrods don't heat up 
as much. Most of the difference is made up by the larger thermal 
expansion of the OE alum pushrods (3x that of steel). If you make 
the pushrods of steel, too, then you have to adjust the valves 
tighter when cold so that they will be correct when warm.

Just how much tighter is the big question. This is where hydraulic 
lifters would be really useful.

-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054

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