[Fot] Bronze valve guides?

[MadMarx]

My opinion is that bronze valve guids are only useful in aluminum heads. No
need to use them in a cast iron head. The risk to have stuck valve is quite
high.
I would use cast iron valve guides.

Cheers
Chris

-----Urspr|ngliche Nachricht-----
Von: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] Im
Auftrag von jim hearn
Gesendet: Dienstag, 17. Februar 2009 22:55
An: 'Friends of Triumph'
Betreff: [Fot] 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]
Fot mailing list
Fot at autox.team.net
http://autox.team.net/mailman/listinfo/fot