Simon
All very good points. Let me tell you what I've learned.
I've found a valve cup manufacturer that will make them
for what I consider a reasonable price. They will be the
latest technology with modern coatings, etc. Besides the
spring/guide/bore dimensions (resulting in the large diameter)
I've found that the valve cup top surface indicates to the
valve cup manufacturer that the base circle of the cam lobe
is quite large and requires the large diameter. The wear
pattern is nearly the entire dia. of the cup.
Thanks for everyone's support. I've really had a lot of responses.
Steve
Mount Vernon, WA USA
----- Original Message -----
From: "Simon Favre" <simon@mondes.com>
To: "Steve Hammatt" <shammatt@sos.net>
Cc: <WSpohn4@aol.com>; <vintage-race@autox.team.net>
Sent: Thursday, November 30, 2000 6:22 PM
Subject: Re: Clarification on Valve Cup information..
> Which looks easier to do? Have custom cups made, or custom springs?
> Far be it for ME to suggest modern technology, but valve springs
> could be made in any size, or an existing set with the right
> dimensions could probably be had. A nice set of three-piece springs
> in a smaller diameter would make it possible to use smaller cups.
> The key parameters are fitted length, fitted load, compressed length,
> compressed load, and of course, diameter. Making a spring larger in
> diameter actually makes the spring constant lower. It should be more
> than possible to duplicate the original spring constant in a smaller
> diameter.
>
> Simon
>
> Steve Hammatt wrote:
> >
> > Simon
> > You nailed it! The required valves springs need the larger i.d.
> > of the large size cups. No luck so far, but thanks to everyone for
> > the suggestions...
> > Steve
> >
> > ----- Original Message -----
> > From: "Simon Favre" <simon@mondes.com>
> > To: <WSpohn4@aol.com>
> > Cc: <shammatt@sos.net>; <vintage-race@autox.team.net>
> > Sent: Wednesday, November 29, 2000 11:36 AM
> > Subject: Re: Clarification on Valve Cup information..
> >
> > > Oddly enough, the Alfa cups are almost exactly the same size as the
> > > Jag cups (1.377").
> > >
> ...
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