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Valve seat question..
Posted by: Grandpacorvair ()
Date: January 12, 2018 01:42PM

Can someone educate me regarding Turbo engine valve seats?

When talking about valve seat improvement, I have heard talk about deeper valve seats. When they say 'deeper' what are they referring to? Also where do people buy 'deeper seats'? One person mentioned Porsche seats...

I'm getting a bit confused when hearing things like "staking seats", "threaded seats", "oversize seats" etc..

Kerry Borgne
Birmingham, Michigan

1963 Spyder Convertible

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Re: Valve seat question..
Posted by: vairmech ()
Date: January 12, 2018 06:11PM

You could always call your local person that does the "deep" seats for a straight answer.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Valve seat question..
Posted by: American Mel ()
Date: January 12, 2018 06:21PM

vairmech Wrote:
-------------------------------------------------------
> You could always call your local person that does
> the "deep" seats for a straight answer.


Nice subtle plug there Ken. thumbs upcool smiley

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Valve seat question..
Posted by: vairmech ()
Date: January 12, 2018 06:29PM

As an FYI here are some measurements that I did on stock and deep seats.

Stock valve seat.


Deep seat.


Stock seat


Deep seat.


Side by side



Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Valve seat question..
Posted by: Chilly Willy ()
Date: January 13, 2018 03:35AM

Nice job ken, it doesn’t get much clearer than that 😎
I can’t swear to it, but I believe my heads do have 914 seats in at least half of the holes. I was staring at the heads while my machinist was telling me,so....




The Corvair, Keeping Nader Notorious winking smiley


Will
Northern California

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Re: Valve seat question..
Posted by: BobV66Vair ()
Date: January 13, 2018 08:55AM

Kerry, the differences are clear in Ken's pictures. The reasons for the differences address issues with the seats in turbo engines. The turbo engine gets hotter than their carbureted cousins because of the higher compression the turbo provides. That heat can make the head drop a seat, dislodge it from the head. That can be catastrophic. The best fix is to remove the old, stock seats and install deeper, larger seats that have a larger purchase in the aluminum head. A qualified machinist can remove the required material from the head and install the deep seats. Then finish the valve job. That helps the seats stay where they should. There are also different metals used for the seats that are stronger than regular steel. You probably don't need anything exotic in a street car.

A machinist who works on Corvair heads should know how to accomplish all the work. I suggest using someone with Corvair experience. Not all machinists now the special things about Corvair engines. The local Corsa club (Corvair club) should help you find one. Others on this forum who are in your area can chime in with recommendations. There are several "national" builders but they are usually used for high performance engines.

Bob Vinnacombe
Sandy, Oregon
1965 Corsa 140 stock
1966 Monza Soon to be race car
1968 Monza Parts for now

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