<VV> More on valve seat failures

[Mark Durham]

Yep, I used a freezer and dry ice for the aviation seats and heated the
cylinders to close to 600 degrees, and yes, they fell right in and I
never had one come out. Mark Durham

Sent from my Windows Phone
From: Marc Sheridan
Sent: 5/8/2012 13:53
To: Virtual Vairs
Subject: Re: <VV> More on valve seat failures
I think it all comes down to economy. You do things differently when
building an aircraft engine versus one for an economy car. Years ago I went
to Trusports Indycar shop for an open house. We were told how valve seats
were done in the race engines. The exotic alloy seats were left in liquid
nitrogen, while the heads were heated in an oven. With the two temperature
extremes, the seats simply fell  into place. Once temperatures equalized,
the engine builder told us nothing would get them out. Not even a heavy
crash that ripped apart the engine.

A race engine isn't an aircraft engine, but I imagine they do something
similar.

Marc Sheridan


On Tue, May 8, 2012 at 4:23 PM, Kerwin Nailor <kerwinnailor at verizon.net>wrote:

> How do the air cooled aviation engines, flat and radial, deal with keeping
> seats in place? They get some pretty dramatic changes in temp, like heavy
> rain.
>
>
> Kerwin Nailor
> kerwinnailor at verizon.net
>
>
 _______________________________________________
This message was sent by the VirtualVairs mailing list, all copyrights
are the property
of the writer, please attribute properly. For help, mailto:vv-help at corvair.org
This list sponsored by the Corvair Society of America, http://www.corvair.org/
Post messages to: VirtualVairs at corvair.org
Change your options: http://www.vv.corvair.org/mailman/options/virtualvairs
 _______________________________________________