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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