Re: Spider cylinder head height?

[James Montebello <jamesm@domain.elided>]

On Sat, 23 Nov 2002 AlfaNeely@domain.elided wrote:
> > At 04:30 AM 11/21/02 +0000, you wrote:
> > >It is always good to measure valve to piston clearance.  Put
> > >modeling clay on the piston tops, assemble the engine, time
> > >the cams, gently turn it over a couple of turns, take the head
> > >back off and measure the clearances.

While you're doing all of this, esp. if you're shaving the head and/or
using high-compresion pistons, is to also check the piston-to-head
clearance, which will be least at the rim (the squish area).  Cold,
figure 1-1.5mm of clearance is acceptable.  More is OK, too, unless
it's over 3mm, in which case you're doing something wrong, or you're
trying to build an 8:1 turbo engine.  Less than 1mm and you're risking
the pistons kissing the head when hot at high revs.

james montebello
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