Thanks for all of the comments. As always, they are extremely helpful.
I talked with Carl (Stritz Machine in Oakland, CA). He couldn't have
been more helpful. Apparently, going back to the early years of
unleaded gas, automotive machine shops were having problems with bronze
guides loosening up and sometimes dropping out. According to Carl, it
is mostly due to the bronze alloy and the gasoline changing that has
caused this problem not to have occurred for quite a while. Looks like
the shop I am dealing with had a very bad time way back.
I got my bronze guides from TRF and I believe that they are some of
Richard Good's. They look good and as always, Richard did a nice job.
I will be putting them in.
Thanks again, Jim
-----Original Message-----
From: marty sukey [mailto:trmarty@hotmail.com]
Sent: Tuesday, February 17, 2009 5:28 PM
To: jim hearn; 6 Digest
Subject: RE: [6pack] Bronze valve guides?
Jim, I've ran them for years without them working loose. I do know they
need to get the clearances correct though. I've worked on two engines
where the shop did not allow for enough clearance which resulted in
valve stem binding.
Marty
> From: jimhearn1@comcast.net
> To: 6pack@autox.team.net
> Date: Tue, 17 Feb 2009 13:53:53 -0800
> Subject: [6pack] Bronze valve guides?
>
> I thought I had seen on some posts that bronze valve guides were the
way to
> go with a TR6 so now that I need to do a complete valve job, I bought
bronze
> guides to do it. When I took it to the machine shop (that has a good
rep
> for doing British stuff), I was told that they had quit putting in
bronze
> guides due to the extra heat in the combustion chamber caused by the
new
> fuel with no lead. They said that early on when they were using bronze
> guides with the new fuel, due to dissimilar expansion rates for the
> different metals (head and guides), guides were loosing up and falling
out.
> Has anyone heard this, experienced this, or have any information on
this.
> Is anyone running bronze guides successfully? Mine is a stock motor
but if
> this is true, there doesn't seem to be enough good points for the
bronze to
> risk the calamity. Any thoughts? Jim
>
> [demime 1.01d removed an attachment of type application/ms-tnef which
had a name of winmail.dat]
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