Jag V12 bellhousing bolt pattern

[chairchild]

My google-fu is failing me - trying to find the bolt pattern for a Jag V12, but the only thing I can get, are links to adaptor kits, for several hundred $$$


My plan is to fit a jag-sourced TH400 auto to another engine. They can be found for as little as £40, no electronics, good for 400Bhp out of the box, and adapting a Landy LT230 transfer case to fit is easy

But... I need the bolt pattern for the bellhousing to make the adaptor plate.


Can anyone point me out to the info I'm after? Or is it simply not published anywhere?




Have the two pics I'm using for inspiration as pennance:




And the CAD model so far:



Still need to improve the model of the engine block, then I can make a start on the *actual* frame design

[jrevillug]

Belt cover at the rear. Chairchild. L-series?

Sorry I'm no help on the bellhousing, though I'd be VERY surprised if you could get factory drawings of it - you may have to buy one and measure it out...

[chairchild]

Spot on Got the engine spare from my old Rover 220SD - target of 300Bhp


Getting a tool made at work to accurately measure the PCD of the L series bolt patterns (seems to be 3 PCDs, with one just located at a right angle to two of the others) Nothing else is in-line with anything on the L series bellhousing....

[93fxdl]

Seems that apart from the earliest engines, the v12 used a general motors bolt pattern,
Possibly this one?
www.locostusa.com/forums/viewtopic.php?f=4&t=12981
Hope this is of help
Ttfn Glenn
Could be wrong though

[chairchild]

unfortunately - nothing like any of the GM patterns



The jag TH400, uses an exclusively jag v12 bolt pattern Just a PITA that GM TH400 trannys go for a silly amount, even though the internals are identical

[93fxdl]

My bad, I spent ages, a while back looking into jag bellhousings for an aborted project, think the gm pattern is used from bellhousing to gearbox. But could be wrong about that too
Ttfn Glenn

[chairchild]

I'm afraid so again, lol



Bellhousing isn't removable. If it was, my life would be FAR easier! I'd just line up the crank and input with a machined adaptor, and weld plates in to make my own bellhousing

[93fxdl]

Found where my misinformation came from
www.jag-lovers.org/books/xj-s/09-Drivetrain.html
They say the post 93. 6 litre used a Chevy patern
Also the 4x4 version seems to get all sorts fitted to it or maybe I am getting muddled with searching I did for engines to fit an Isuzu box
Ttfn Glenn

[chairchild]

What is less known is that this transmission (through 1992) has a housing designed specifically to mate with the Jaguar V12. Because the GM400 has an integral bell housing, a GM400 from any other car will not fit.

....

As a result of a complete revamp, the 1993-on 6.0 liter V12 has a standard GM engine/transmission bolt pattern. Cars with this engine come with a 4-speed version of the GM400.

OOoooh... so looks like I may be keeping my eye out for the later spec 6L gearbox! Not only does it mean I've got a better chance of getting the bolt pattern, but I'll have an extra gear

[customsinc]

I'd be concentrating on how you're going to get 300hp from a L-series rather than bell housings! Don't get me wrong, great engines and I love them, got a couple I'm building for my own projects but even 180hp can be awkward, think there's a couple knocking on the door of 190/200 but with EGT's through the roof...

[chairchild]

guess who built the turbo that got the original 180Bhp (and yes, I'm still keeping the source of the turbine housing a closely guarded secret). I have many tweaks planned for it, to get a reliable 300Bhp


I've given up posting most of my things on MG-rover.org, as I just get told I'm "wrong", because it goes against what they've read on forums....

Made the tool for measuring the L series bolt pattern yesterday. The dowel hole needs opening up a smidge before I can use it however

[waveman1500]

Wow, I love this project! Can't wait for the build thread. Turbo-diesel semi-recumbent motorcycle with automatic transmission! Is this going to be used for land-speed record type runs, or is it for the street?

When I was at Adelaide University, one of the final year MechEng projects was a bike powered by an Astra diesel engine, which was intended to break a world land speed record. Very interesting project, but unfortunately there was no way that the students involved would have been allowed to ride it! blogs.adelaide.edu.au/mecheng/2011/03/28/honours-students-attempt-to-break-the-land-speed-record/

[chairchild]

hopefully for commuting it's not going to be built for several years yet, but that gives me a lot of time to slowly build up the ideal parts needed, rather than just what I've got to hand, like I've had to do on previous projects....



I've still got to finish the jet engine yet! lol