The answer is titanium. the valve keys in alloy valve spring
retainers creep downwards. I pack my valve springs to .060" (the
springs bind when a .060 feeler gauge is inserted) and have seen as
much as .100 of creep after the first race--less after that but they
keep moving. And I don't use particularly strong seat pressure. I
don't remember what it is, but it's not high compared to some racers
I know, probably less than 200#, Bob Yarwood talked me into that and
it's worked fine.
I replaced my alloy retainers with titanium, and no creep. At all.
One brief sting to the wallet and you never have to worry about them
again. No I don't know where they came from, Yarwood found them for
me. I miss that old fart.
Bill Babcock
billb@bnj.com
bnj Website for Babcock & Jenkins, a direct and interactive agency
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On May 8, 2007, at 8:15 AM, Guyots3@wmconnect.com wrote:
> I understand the reasons for fitting alloy valve spring retainers,
> and the
> advantages.
>
> I also know that in the past, I have heard reports of failures of
> those sold
> by Moss, dropping valves into the engine with obviously disastorous
> results.
>
> Looking at what is available on the market these days, from all
> kinds of
> sources.
>
> I see many vendors merely referring to them as 'Alloy', which tells
> us very
> little, whereas one calls them 'Aircraft Alloy' - still a very
> broad cover-all
> term.
>
> One calls them 'T6061', and yet another calls them '7075'.
>
> These are both 'aircraft alloys' and the 7075 has a much greater
> tensile
> strength than the T6061.
>
> Does anyone have any actual experiences, both good and bad of using
> different
> suppliers alloy valve caps?
>
> If you do, then please tell me!
>
> I am afraid that I have little faith in companies that do not give
> proper
> technical descriptions of their products, especially critical ones,
> such as
> valve
> retaining caps and/or cam followers.
>
> Thanks in advance for any help provided.
>
> Best Regards
>
> Lion
>
>
>
>
>
>
>
>
> <A
> HREF="http://community.webshots.com/user/vitesse1963";>http://
> community.websho
> ts.com/user/vitesse1963</A>
>
>
> </HTML>
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