David,
Sharp points become very hot as they have a smaller cross section of metal
through which they can conduct away the heat relative to a large surface
area exposed to the combusting gases. It is less critical with aluminium
since it conducts heat better than iron. It is worth taking away the sharp
edges on the valve reliefs and checking for sharp edges in the head (usually
around the plug hole, valve seats) Also put a small radius on the top of the
bore (Helps get the rings past too) and small radius on the outside corners
of the combustion chamber too.
Since you are building the engine, check the match of the inlet manifold to
the ports (get them both to match the gasket.) I found on new edelbrock
heads and new edelbrock manifold the match was exact on the heads and way
out on the manifold. The manifold holes were smaller so were easy to open
out to match the gasket.
cheers, derek
-----Original Message-----
From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net]On
Behalf Of sosnaenergyconsulting
Sent: Friday, August 06, 2004 5:45 AM
To: Tiger's Den
Subject: Sharp edges in the combustion chamber
Hi again:
I was under the impression that sharp edges within the combustion
chamber could lead to detonation.
If this is true, would there be any point to 'easing' the edges of the
valve reliefs in the tops of a new set of pistons?
Thanks in advance for any input you can offer.
Best Regards
David Sosna
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