<VV> 110 vs 140 Heads

[MarK Durham]

That is incorrect. Some  radial engine designs used screw in seats but most
modern air cooled Lycoming and Continental engine designs since the 1960's
do not. They are an interference fit just like the Corvair. Where do you
think GM got the data from? Aviation. Mark Durham Hauser Idaho
On Mar 25, 2014 9:22 AM, "Mike McCrae" <mmccrae6 at cox.net> wrote:

> 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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