<VV> 110 vs 140 Heads

[Mike McCrae]

Yes....but most aircraft seats screw in, and are then pinned....they cant 
drop out.

Mike McCrae

-----Original Message----- 
From: jvhroberts at aol.com
Sent: Tuesday, March 25, 2014 7:53 AM
To: 62vair at gmail.com ; corvairduval at cox.net
Cc: virtualvairs at corvair.org
Subject: Re:  110 vs 140 Heads


I always wondered about a different alloy for the seats.
Aluminum has a CTE of about 13 ppm/F.
There's a bunch of steel alloys, such as high manganese steel, molybdenum 
steel alloys, certain types of hardenable cast iron and some cast stainless 
alloys that just about match this in the temperature range of interest. I 
think aircraft engines have taken this approack.
Anyway, something to think about. Seats are simple parts to machine, from a 
CNC standpoint.




John Roberts




-----Original Message-----
From: MarK Durham <62vair at gmail.com>
To: Frank DuVal <corvairduval at cox.net>
Cc: virtualvairs <virtualvairs at corvair.org>
Sent: Tue, Mar 25, 2014 9:41 am
Subject: Re: <VV> 110 vs 140 Heads


Yes, everything is getting old. That has to be a big factor. And you are
correct, heat is heat, and small valve heads will experience the same
issues if they get warn enough, its just harder to get them there in
average coupé or sedan driving.  Since my heads only have 72k mikes on
them, and I still have the original seats, I am probably OK. I only drive
the car 1500 Miles a year. Mark Durham Hauser Idaho.
On Mar 24, 2014 9:30 PM, "Frank DuVal" <corvairduval at cox.net> wrote:




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