[Fot] use of BRONZE GUIDES

[Joe Boruch]

I have been using bronze guides for about 15 years without a problem.  Just
need adequate clearances.  They are easy to machine and shape the way you
want.  I run seals on the intakes and machine the tops to fit the seal.  Got
them from BFE the last time that I bought them.   Joe(B)

---------- Original Message ----------
From: "Enquiries Road & Track" <enquiries at roadandtrack.net.au>
To: fot at autox.team.net
Subject: [Fot] use of BRONZE GUIDES
Date: Fri, 4 Nov 2011 16:42:21 +1000

in our engine shop, we avoid bronze guides unless we really have to use
them such as with some specially coated titanium valves

cast iron guides last for a very long time under very arduous conditions

about the only OE manufacturer that I've seen that routinely uses a bronze
guide is M Benz, and they are a very special product and only used in some
of their engines

not all bronze guides are equal. we have encountered numerous grades. all
of them are notoriously difficult to size. we have special tooling to deal
with them.

there is an argument that some types of bronze guides can run lower
clearances and therfore improve heat transfer from valve stem to guide. i
have never seen any documented or visual proof of this .

IMHO, especially with older cars like TR's, they are mostly a marketing
fad, with unscrupulous vendors appealing to the 'go faster" set

Terry
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