<VV> The Cromwell Method?

[Charles Cromwell]

I have been watching this thread with a considerable
amount of interest. I should have because the cromwell
method is my idea. Yes it works. It has been in use by
several Corvairs. Only one person had trouble with my
heads. He drove a race car with poor cooling. I have
been racing for several years with the set of 140
heads I did. I will have to look up the printed sheet
I posted a couple of years ago.I will post it when I
do.
Chuck


>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>



--- RoboMan91324@aol.com wrote:
> OK Gang,
> 
> As usual, I have lagged behind on my digests, so
> this may have been asked and 
> answered but here goes ........  What exactly is the
> "Cromwell Method" of 
> retaining valve seats?  Where can I get detailed
> info on how to do it?  Most 
> important; is this a proven method like the deep
> seat method or is it just that 
> nobody has experienced a failure with the Cromwell
> method YET?  It was said that 
> it is reliable for someone on a budget.  I am not
> sure what that means.  Does 
> it fail for people who aren't on a budget?  How does
> it know if you are on a 
> budget or not?  (gggggggg)
> 
> Cheap and easy is a good thing if it works.
> Doc
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Message: 7
> > Date: Tue, 20 Apr 2004 23:43:20 -0700
> > To: <virtualvairs@corvair.org>
> > From: Tony <tonyu@roava.net>
> > Subject: Re: <VV> Re: valve seat set screw
> retention/tap sizes
> > 
> > At 1049 04/20/2004 -0400, Bruce Schug wrote:
> > >
> > >This thread has turned into a somewhat
> interesting thread on threads (?). 
> > But, I have to ask, is this a viable way to get
> reliable valve seats in a 
> > Corvair? 
> > 
> > Well, for the folks on a budget who don't mind the
> DIYS methods, yes it is.  
> >  
> > 
> > >I've heard it mentioned from time-to-time but I
> continue to hear that the 
> > best way to solve this problem is to:
> > >
> > >1. Heat the whole head to remove stress (I think
> that's what it does)
> > >2. Remove all the old seats
> > >3. Machine the head for DEEPER seats
> > >4 Heat the head and install the new deep seats
> with a significant 
> > interference fit.
> > 
> > Nice fix, good for the duration, never have to
> worry much about a seat 
> > coming
> > out again.  But...   
> > 
> > How much dos this cost today?   
> > 
> > 
> > >I will add that Bob Coffin installed bullit-proof
> seats in my heads in 1986 
> > when he was still in Mass. I have never had a
> problem with them through all 
> > kinds of driving conditions: rallys, autocrosses,
> VIR in 90+ degree heat, 
> > economy runs, street driving with the
> air-conditioning on, etc. Why try to 
> > invent the wheel, this wheel works fine for me!
> > 
> > I don't think anyone was trying to reinvent the
> wheel, just trying to keep 
> > the existing wheel rolling without going broke.   
> > 
> > I've done the Cromwell setscrew trick and it
> works... and it cost me about 
> > 15 bucks for the hardware to do 4 heads.   Make
> sure the guides are OK and the 
> > seats will stay put.   So far, so good.   
> > 
> > tony.. 
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