BP Bellhousing CAD drawing
 

Help!

Has anyone here ever done a cad drawing of a BP bellhousing? Most likely for building a transmission adapter plate... someone here must have done it before I'd think?

I'm trying to put an MR2 turbo trans on my fwd BP, in case you were wondering. I have access to a CNC plasma cutter table (girlfriend's father :)), but I don’t have the tools or skills to accurately measure and draw the bellhousing patterns. If I can get a drawing of each I could combine them into something useful, though.

Please shoot me a PM if you have any drawings available, thanks!

I think there is one floating around....i remember reading possibly m2cupcar or someone who did the TII conversion.


I fixed your sig pic btw.

thanks, i'll search around!

thanks for fixing that... i havent been here in a while, i actually need to update it too. i've since run a 12.28 @ 117, and dynoed 320 whp :D. a couple weeks later i grenaded my transmission... so yeah. 3k miles out of a freshly rebuilt gearbox is unacceptable :(

just upload a new sig pic. should be in the edit signature area.

I'd love to get a copy of it! I did my TII adapter plate by hand :(

how did your plate turn out doing it by hand? ive run into two seperate schools of thought... people like you who've done it by hand with transfer punches and a drill press, and other people who say "that will never work, it needs to have 0.002" tolerances and be made on a CNC".

have you run into any issues after doing the conversion? what was your exact method, how precise were you?

not me- IIRC it was somebody on m.net from FL that planned to build an order of the adapter plates but it never happened.

well if someone can come up with a BP drawing and a TII drawing, maybe i could have some of those plates cut up as well... *wink wink nudge nudge* :)

as i said in my thread on m.net, i'm not an engineer or a machinist, but i do have (very affordable) access to a CNC plasma cutter table... i just need to provide a drawing.

Mine worked out great, but I did have access to a very good drill press and a manual mill.

We made a plate between a VW TDI and a supra 5 speed. Totally by hand (cutting with a plasma, drilling on a drill press) and it worked just fine, the first time.

I'm always lost trying to make measurements like that. Stuff comes out, but I never feel right about it.

If it matters, a friend of a friend has a 418whp mr2 turbo beast that goes through trannys fairly regularly.
Maybe it's his driving style but the threshold for pain in those trannys is somewhere near where he is power-wise.

As far as i've been able to find, the MR2 turbo trannies are some of the most durable compact transverse mount manual transmissions you can get. It must have something to do with his driving style or possibly clutch choice (unsprung hubs and puck discs kill trannies!). I've seen a 700awhp celica gt4's running 10's reliably with a stock gearbox. The awd gearbox is the same as the mr2 gearbox... you can actually convert between the two with bolt-together parts. The MR2 diff and block off plate is replaced by a rear transfer case. Either way, I doubt I'll every clear 400whp and my car is significantly lighter than an MR2 :).

Worst comes to worst I might end up doing this by hand myself. All the machine shops I called today told me "sorry we don’t do that, call someone with a CNC."

If someone has the dimensions I can CAD it up.

I might even be tempted to tackle it.. This is what I did today:

http://abefm.smugmug.com/photos/452041527_a7H9Q-L.png

damn, what is that? looks a hell of a lot harder to draw than a bellhousing pattern :P

getting the dimensions measured accurately i guess is going to be the hardest part. anyone have a spare block or tranny and the right tools to get these guys started? i have parts but no measuring tools...

sixshooter - could you ask your friend what tends to fail in his transmissions? i'm curious if there is a common weak point.

checked with a place who does CMM and they want $250 for each transmission... which would put me at roughly $600 to make this adapter.... no thanks

if anyone has the proper tools to measure and draw this thing i can mail you a bellhousing to measure from...

Huh. I have a tranny. All I need is a large scanner. :-)

hmmm, i cant help you out there unfortunately :(

I have the bell housing/ Transmission just no real way to measure it.

Actually I will check with the machine shop that was originally going to help with the oil gears.

Well, you can always do it with transfer punches. put the tranny on a plate or something semi-soft, and bang with a transfer punch though each hole, being sure not to move it. Worst case you spend some of the bugjet you would have spent having it done doing it this way. If you know the distance from each hole to each other, you can reconstruct it pretty fast. Odds are reasonable most of the distances work out to be something sensible in metric.

At least, after this long I'd be willing to try it. :-)

Huh, not metric, but i have transfer punches at work. And I could make a bushing to get a tight fit. Wouldn't tell me where the output shaft goes, but it would be most of a start, that I could get by other means. Maybe I'll get on that.