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Did a prototype OHC Corvair Engine ever get built???
Posted by: carolinefx ()
Date: December 20, 2006 01:23PM

Just curious: I've seen a picture (ca. 1965) of the "next generation" Corvair Engine with an Overhead Cam - obviously, this was when the car was still being developed.

I think the pic was in Car and Driver and was talked about for the 68/69 model year. Anyone know if one ever got built and if it might be in a museum (or a garage (g) somewhere??

Caroline, Keene NH
'69 Monza Conv/140

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: Spectre ()
Date: December 20, 2006 02:22PM

Try here:

[www.corvaircorsa.com]

[www.corvaircorsa.com]


David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Warner Robins, GA (15 miles south of Macon)

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: ScottS ()
Date: December 20, 2006 04:22PM

You now, the Honda XR400 air cooledmotorcylce engine has the same bore as the corvair, with 5 valves per cylinder and OHC. Now Ijust need to figure ot how to get 3 of them next to each oher and turn the cams.

Photobucket - Video and Image Hosting
1969 Monza Coupe
1966 Nader Invader !
1966 Monza Coupe
www.vaircooled.com
I love Corvairs
Ohio

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Re: Honda XR400 head
Posted by: Noah ()
Date: December 20, 2006 06:44PM

I thought it was a 4 valve, SOHC. Looks like the chain comes up through an enclosed pocket in the head. Would be sweet though. Hmm... $340 X 6= $2040!
Also it would be a crazy, exotic exhaust system.

Noah
Milwaukee

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Re: Honda XR400 head- oops, wrong size pics
Posted by: Noah ()
Date: December 20, 2006 06:52PM

n/m

Noah
Milwaukee

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Re: Honda XR400 head- oops, wrong size pics
Posted by: carolinefx ()
Date: December 20, 2006 07:47PM


OK, now THIS would be an engine - From the CorvairCorsa.com website: "bore and stroke of 3.56 and 2.94 inches, displacing 176 cubic inches. It was air-cooled, but unlike the production engine, used three tandem centrifugal blowers on a common shaft above the engine to blow cooling air over the cylinder blocks. Designed as a high output unit, the engine produced 240 horsepower at 7200 RPM. Specific power was 1.4 horsepower per cubic inch!

Each side of the engine was fed air and fuel by using a Weber style 3-throat carburetor on a special light alloy head with a single overhead camshaft. The cylinder heads had nearly hemispherical combustion chambers and inclined valves. Camshafts were driven by Gilmer-style belts from the crankshaft

Now, if only I can find six XR 400 cylinder heads, weber carbs, do exotic welding and machining in aluminum and I'd be all set!!! LOL

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: ScottS ()
Date: December 20, 2006 07:52PM

Actually I was going to put 6 Keihin carbs on it and fab some headers ( in my fantasy) the chain drive side of the head could be machined away and the cams connected end to end and driven from one end.

I figure an XR400 makes round 30hp , so 30 x 6 = 180 HP

I as thinking there really was no reason that 3 indvidual heads would not work.

The only restriction to power is in the heads , as the pistons only go up and down. The XR only runs about 6000-7500 RPM anyway.

Photobucket - Video and Image Hosting
1969 Monza Coupe
1966 Nader Invader !
1966 Monza Coupe
www.vaircooled.com
I love Corvairs
Ohio

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: ScottS ()
Date: December 20, 2006 07:58PM

that engne does not look like a prototype to me- it looks fairly well developed.Maybe the 1970 engine ? Man , think what a 72 Corvar would have been like !

Photobucket - Video and Image Hosting
1969 Monza Coupe
1966 Nader Invader !
1966 Monza Coupe
www.vaircooled.com
I love Corvairs
Ohio

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: ScottS ()
Date: December 20, 2006 08:09PM

I can also picture throttle bodies in place of those webers for fuel injection !

Photobucket - Video and Image Hosting
1969 Monza Coupe
1966 Nader Invader !
1966 Monza Coupe
www.vaircooled.com
I love Corvairs
Ohio

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: wcelliot ()
Date: December 20, 2006 08:44PM

Discarding Webers for Fuel Injection? That's just sad. ;-)

Bill

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: ScottS ()
Date: December 20, 2006 09:38PM

I was thinking to meet EPA if it was a production engine.

Photobucket - Video and Image Hosting
1969 Monza Coupe
1966 Nader Invader !
1966 Monza Coupe
www.vaircooled.com
I love Corvairs
Ohio

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: aeroned ()
Date: December 21, 2006 04:48AM

I can picture it in my car....

Dear Santa,
Forget the slippers, ties and sweaters this year...

Ned

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: ScottS ()
Date: December 21, 2006 12:04PM

You know what is driving me nuts is that the heads look like castings and the rocker covers ook like stampings. . Wonder if any of these engines still exist, and/or any tooling used to produce them. What a great way to re-power all the corvairs running around. 3.1 liters , 200+ HP.

Photobucket - Video and Image Hosting
1969 Monza Coupe
1966 Nader Invader !
1966 Monza Coupe
www.vaircooled.com
I love Corvairs
Ohio

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: jjohnsonjo ()
Date: December 21, 2006 02:21PM

If thought about this for a long time since I've had my 79 XLs since new. The 4 valve head really breaths well. Just think how the bottom would look, 12 header pipes coming off the engine! 6 X 500cc=3000cc and 6 X 38hp= 228hp. This would would have really strong torque range. I see these bikes parted out on ebay quite often. But just don't have time for a project like this. Maybe I should move to Alaska.

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Re: Did a prototype OHC Corvair Engine ever get built???
Posted by: wcelliot ()
Date: December 21, 2006 02:37PM

Just as an example of how this could be done... here is a friend's Mini Cooper website where he fit a modern BMW motorcycle head assembly to an ancient British A-series engine... of course he didn't have air cooling to be concerned about...

[www.miniman.com.au]

Bill

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