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V12 in the Back Seat of a Corvair
Posted by: Phil Dally ()
Date: April 02, 2020 06:27PM

Has it ever been done...I know about Jay Eitel's front engine car.

On Saturday I will acquire a spare V12...Pontiac 8 is going in it.

Jaguar V12 comes with TH-400 so I'll have that adapter plate.

Jaguar 5.3 V12 with big car Powerglide and a C5 differential.

Is a Jag V12 any longer than a Mark IV Big Block Chevy V8.

Searched all over and cant find any actual dimensions.

I still have a SuperVair sub frame...perfect Y/N?

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Re: V12 in the Back Seat of a Corvair
Posted by: racingguy2 ()
Date: April 02, 2020 07:16PM

I'll take any dimensions you'd like! I've got a '90 XJS that I'm parting out. I've got the fuel injection off, so it will be easy to measure the long block.

If you want to save length, adapt to a six rib, VW 1980-'83 Vanagon transaxle. It'll take the HP, and KEP sells adapter plates.

It's not a quiet engine, push it as far back away from you as possible.

Eric
Plymouth, Michigan
74 Kelmark GT (Mid engine Corvair 140)
02 Maserati CambioCorsa Spyder
06 Porsche Cayenne
89 Jaguar XJS 12
86 Alfa Romeo Graduate (7200 miles!)
1902 Curved dash Olds
70 Fiberfab Avenger
57 Ford Custom 300 (factory 312Y)
80 Mercedes-Benz 450SL
05 Audi TT
Cylinder head and valvetrain engineer, PhD Nuclear Engineer
Originator of strange ideas and over-complicated solutions!



Edited 1 time(s). Last edit at 04/02/2020 07:18PM by racingguy2.

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Re: V12 in the Back Seat of a Corvair
Posted by: American Mel ()
Date: April 02, 2020 10:55PM

Do it to a Moredoor!
Tint the rear windows, TOTAL SLEEPER! eye popping smiley
Besides, you will have better access to the back to work on that English Beast. grinning 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.
Have; '66 Monza Coupe - 140, 4-spd. Daily driver beater
'67 Monza Vert. - 140, 4-spd. Daily driver beater
'67 A/C Moredoor Monza
Have had; '61 Monza coupe, '62 Monza Wagon, '63 Spyder, '65 Corsa
.
non-vair
'04 Dodge Cummins Quad Dualy, approaching 400K
17'Terry

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Re: V12 in the Back Seat of a Corvair
Posted by: john.jackson ()
Date: April 02, 2020 11:28PM

Phil,

You are a really crazy SOB.

Respectfully,

JJ

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Re: V12 in the Back Seat of a Corvair
Posted by: bertle ()
Date: April 03, 2020 02:21AM

I know of a slightly eccentric chap who put one in a Triumph Spitfire, it was interesting to say the least!

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Re: V12 in the Back Seat of a Corvair
Posted by: 180sret ()
Date: April 03, 2020 07:54AM

I remember researching a V12 mid engine swap some years back. If I recall the Jag V12 weighs in around 780lbs and is around 7-8" longer. Don't quote me as memory ain't what it used to be. A Kelmark setup is what I had planned. Still think a supercharged V12 would be trick! Go for it!

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Re: V12 in the Back Seat of a Corvair
Posted by: Phil Dally ()
Date: April 03, 2020 08:33AM

I cant hardly wait to dig into that "Price of Darkness" fuel injection.

Turns out there is quite the Jag V12 boat powered group in England.

They have come up with a few carburetor alternative manifolds.

Holley...you always know what your going to get from them.

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Re: V12 in the Back Seat of a Corvair
Posted by: cnicol ()
Date: April 03, 2020 08:56AM

Phil, you're a tall guy and as you know, tall guys are challenged in mid-V8 cars.

The 326 cubic inch Jag V12 is a very long engine. I don't see where this is happening unless you install a TH425 Transaxle. With the TH425, the swap is very practical.

Lance Jordan has an 18" bell housing between his 350 and his TH425 primarily to get the blower under the roof. Without that long bell housing, the engine would be way-back in the chassis which would be a plus for that V12.

Note Lance's engine ends up in the normal small-block position. Note where Lance (passenger) ends up relative to the door opening. Lance's daughter (driver) is very short so her seat position is abnormally forward and not relevant here.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: V12 in the Back Seat of a Corvair
Posted by: racingguy2 ()
Date: April 03, 2020 08:58AM

Interesting! Who makes the manifolds?

Eric
Plymouth, Michigan
74 Kelmark GT (Mid engine Corvair 140)
02 Maserati CambioCorsa Spyder
06 Porsche Cayenne
89 Jaguar XJS 12
86 Alfa Romeo Graduate (7200 miles!)
1902 Curved dash Olds
70 Fiberfab Avenger
57 Ford Custom 300 (factory 312Y)
80 Mercedes-Benz 450SL
05 Audi TT
Cylinder head and valvetrain engineer, PhD Nuclear Engineer
Originator of strange ideas and over-complicated solutions!

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Re: V12 in the Back Seat of a Corvair
Posted by: Phil Dally ()
Date: April 03, 2020 09:02AM

I'm familiar with Lance's car and the TH425 is an interesting idea.

That bellhousing pattern is Oldsmobile and or Cadillac right?

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Re: V12 in the Back Seat of a Corvair
Posted by: Phil Dally ()
Date: April 03, 2020 09:05AM

Haven't found who on the manifold yet...search carburetor Jag V12.

These above were in an old expired gumtree.com (UK Craigslist) ad.

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Re: V12 in the Back Seat of a Corvair
Posted by: racingguy2 ()
Date: April 03, 2020 09:16AM

Yeah, did that before I posted, only found the same one. All I can find are Weber and SU conversions.

Eric
Plymouth, Michigan
74 Kelmark GT (Mid engine Corvair 140)
02 Maserati CambioCorsa Spyder
06 Porsche Cayenne
89 Jaguar XJS 12
86 Alfa Romeo Graduate (7200 miles!)
1902 Curved dash Olds
70 Fiberfab Avenger
57 Ford Custom 300 (factory 312Y)
80 Mercedes-Benz 450SL
05 Audi TT
Cylinder head and valvetrain engineer, PhD Nuclear Engineer
Originator of strange ideas and over-complicated solutions!

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Re: V12 in the Back Seat of a Corvair
Posted by: cnicol ()
Date: April 03, 2020 09:26AM

Phil Dally Wrote:
-------------------------------------------------------


"That bellhousing pattern is Oldsmobile and or Cadillac right?"

Craig replies: BOP pattern.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: V12 in the Back Seat of a Corvair
Posted by: Phil Dally ()
Date: April 03, 2020 05:26PM

Wikipedia says, "Four bolt holes and two locator pins are common to the Chevrolet, and B-O-P patterns. Some transmissions take advantage of this by integrating both specifications into a "universal" bolt pattern casting."

Does that mean what I think it means?

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Re: V12 in the Back Seat of a Corvair
Posted by: goatsnvairs ()
Date: April 03, 2020 05:36PM

How long are your legs?

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Re: V12 in the Back Seat of a Corvair
Posted by: joelsplace ()
Date: April 03, 2020 05:57PM

I've seen the dual pattern before on a replacement TH350 or TH400.

Joel
Northlake, TX
5 Ultravans, 114 Corvairs and counting...

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Re: V12 in the Back Seat of a Corvair
Posted by: Ed Dowds ()
Date: April 04, 2020 05:25AM

I think the Jag TH400 has a bolt pattern that is not SBC or BOP.
TH400s were used in other cars (Rolls Royce?) and had cases that were specific to the engines that they were mated to.
Something to check while you are "imagine engineering"!

Ed
Hamilton, NJ
66 500 rear 4.3 V6 Corvair
69 350/350 TH Camaro was RS
30 Model A Ford Streetrod 350/400 TH
88 Celebrity Wagon (Daily Driver)

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Re: V12 in the Back Seat of a Corvair
Posted by: joelsplace ()
Date: April 04, 2020 05:37AM

[i.ebayimg.com]
Yes totally different pattern.

Joel
Northlake, TX
5 Ultravans, 114 Corvairs and counting...

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Re: V12 in the Back Seat of a Corvair
Posted by: Phil Dally ()
Date: April 04, 2020 06:36PM

Quote
Ed Dowds
I think the Jag TH400 has a bolt pattern that is not SBC or BOP.

Indeed it is a completely different pattern that is British.

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Re: V12 in the Back Seat of a Corvair
Posted by: alphasud ()
Date: April 04, 2020 07:54PM

I say go big or go home,

David North Idaho
1965 Corsa Turbo converted to 140
1971 Super Beetle with 2.5L Subaru engine
1965 Corsa mid engine project
1973 Mercedes 280 project

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