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Re: Mid "Corvair engine" Build Discussion.
Posted by: OttawaCorvairGuy ()
Date: January 14, 2018 05:35AM

MattNall Wrote:
-------------------------------------------------------
> Everything is upside down to keep it simple....
>
> I've also got the instructions on how to flip just the differential on a PG....
>
> although Warren LeVeque ran his PG upside down as well... and it worked fine...
>
> Sadly much more involved in this mod..


I would like to have the instructions on how to ONLY flip the PG differential and not the PG it self.

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Re: Mid "Corvair engine" Build Discussion.
Posted by: MattNall ()
Date: January 14, 2018 07:58AM

Just search for me and MIDVair I posted several times.





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Mid "Corvair engine" Build Discussion.
Posted by: 66vairman ()
Date: January 14, 2018 08:23AM

Seth Emerson Wrote:
-------------------------------------------------------
> Tony - When the factory built the Corvair
> mid-engined -Think Monza GT - they used a special
> reverse cut Ring and pinion mounted in the same
> case as the regular one. The engine and
> transmission turned as originally designed. the
> output of the differential was the only thing
> reversed. There were a number of those sets
> re-made in the aftermarket. That is the simplest
> way to go mid-engine. Not the cheapest or the best
> "technically", perhaps - It would be nice to have
> a 5-speed! But it allows you to use Corvair parts
> - mostly. If you want to use the Boxster
> transaxle, you would have to reverse the motor
> rotation. From a technical aspect, you should try
> to maintain the greatest number of parts turning
> in their original design direction. That said,
> many reversed motors have been built. The reversed
> ring & Pinion should be investigated to make sure
> oil is going into the correct places during
> operation.

That's interesting Seth. I recall the Kelmark V8 kits had an issue with the ring and pinion since they are turned reverse. Something about not enough slinging oil to the pinion bearing. I think the case was cast to catch oil slung off the ring and guide it to the pinion bearing. Not sure.

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Re: Mid "Corvair engine" Build Discussion.
Posted by: OttawaCorvairGuy ()
Date: January 14, 2018 08:28AM

QUESTION

Is the Ring and Pinion the same in a PG and Manual differential or are they different?

I know it cost $$$$$ to do it. However, It might be easier to do a run of reverse gears. More so if there were enough people to join in to cover the cost.

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Re: Mid "Corvair engine" Build Discussion.
Posted by: MattNall ()
Date: January 14, 2018 08:45AM

R & P are the same... only the case and pinion shaft are different.





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Mid "Corvair engine" Build Discussion.
Posted by: DaveO90s4 ()
Date: January 14, 2018 07:37PM

OttawaCorvairGuy,

I'm the person who quite recently put a mid mount reverse rotation Corvair engine into my Porsche 914 and mated it using Lennedy adapter to my OEM 914 (Type 901) gearbox.

I've only done it once, it all works, but I'm no expert. Any questions you have I'd be pleased to try to answer


Regards

Dave

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Re: Mid "Corvair engine" Build Discussion.
Posted by: OttawaCorvairGuy ()
Date: January 14, 2018 07:51PM

Thank you Dave. I'll be in touch.

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Re: Mid "Corvair engine" Build Discussion.
Posted by: Seth Emerson ()
Date: January 14, 2018 08:33PM

Warren did not (originally) change the powertrain when he went mid engine Corvair in his ex-Formula SAAB car. It was a light-weight Autocross only car. He just turned the complete late Corvair power-pack around. He autocrossed with the transmission shifted into reverse. He replaced it with a modified stick setup later, when the PG "blew up" - as in exploded - after an internal failure of some type. The car - many years and mods later - is now owned by Dave Clemens, I believe. When Warren still had the PG in the car, it was probably the only car in America capable of doing 100 MPH backing up.

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Re: Mid "Corvair engine" Build Discussion.
Posted by: dragvairclark ()
Date: January 15, 2018 03:23AM

Not only will the starter be lower, the engine will be lower. The pinion gear in a Corvair diff is not on the centerline of the ring gear. In standard form the engine is roughly 1.5" above the CL so when you reverse the bell housing the engine will be 1.5" below the CL or 3" lower than stock. Note: the 1.5" is a guess. I don't know the real dimension.

Clark Hartzel, Fraser, MI
1965 Monza coupe

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Re: Mid "Corvair engine" Build Discussion.
Posted by: American Mel ()
Date: January 15, 2018 04:22PM

Seth Emerson Wrote:
-------------------------------------------------------
> Warren did not (originally) change the powertrain
> when he went mid engine Corvair in his ex-Formula
> SAAB car. It was a light-weight Autocross only
> car. He just turned the complete late Corvair
> power-pack around. He autocrossed with the
> transmission shifted into reverse. He replaced it
> with a modified stick setup later, when the PG
> "blew up" - as in exploded - after an internal
> failure of some type.
The car - many years and
> mods later - is now owned by Dave Clemens, I
> believe. When Warren still had the PG in the car,
> it was probably the only car in America capable of
> doing 100 MPH backing up.

Yeah, here is warren's direct quote.
"For a short time I had a powerglide (right side up) in the open wheeler in order to get my wife to drive it. We simplly ran it in reverse gear (1.82:1) which is the same as second in a three speed manual. I had a high stall torque converter to help in the slaloms. It would do 70 in reverse at 6500 rpm which is plenty for most autoctrosses. I also baffled the PG oil pan so that it would work in hard corners.

At an unusually fast autocoss the large planetary reverse gear exploded and tore up the wing, tires, and exhaust. After that I simply ran a 3.27 4 speed, took off in 2nd and never shifted. Same as an automatic and the wife was fine with it."

I was reading somewhere just recently about the Corvair PG and it also said that the Torque Converter starts to "Balloon" at very high line pressures.

.
-----------------------------------------------
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: Mid "Corvair engine" Build Discussion.
Posted by: OttawaCorvairGuy ()
Date: January 16, 2018 10:53AM

Not being a welder or a road course guy. What are the two best (with #1 being the "BEST" ) materials to use to make a frame close to this?





Edited 1 time(s). Last edit at 01/16/2018 10:53AM by OttawaCorvairGuy.

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Re: Mid "Corvair engine" Build Discussion.
Posted by: MattNall ()
Date: January 16, 2018 11:07AM

Mild steel is adequate... Chrome Moly is best... seamless tubing..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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