healeys
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Re: bj8 restoration

To: BJ8Healeys <sbyers@ec.rr.com>
Subject: Re: bj8 restoration
From: Dave & Marlene <rusd@velocitus.net>
Date: Mon, 03 May 2004 21:43:12 -0600
Steve,

There is nothing wrong with doing the mods if you're so inclined. Peace 
of mind is worth a lot.

You are also correct on the theory. The metal removal is caused by micro 
welds being constantly made & broken.  Lead causes enough joint 
contamination to prevent most of the welding. Dirty joints won't weld.

Dave Russell

BJ8Healeys wrote:
    The cost
> of the no-lead mods was insignificant compared to the total cost of the
> rebuild, so I was happy to pay it for the peace of mind.  I have more than
> 40,000 miles on a non-leaking engine, so I am very happy with his work and
> have just let him do a 1275 Midget engine for me (with no-lead mods).
> 
> As I understand the theory, it's the slight but constant transfer of metal
> between the valve and seat as the valve slams into the seat that causes "valve
> recession".  The lead additives in gasoline provided some measure of
> cushioning effect between the valve seat and the valve mating surfaces.  But
> then, I could be wrong.
> 
> Cheers!
> Steve





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