 924 turbo transaxle, impossible? |
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| Howard |
 Mar 27 2004, 08:36 PM
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#1
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Incontin(g)ent Member  Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None 
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Could this work in a teener? So many $$$ ideas to replace 901, what to you think?
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| Bleyseng |
Mar 27 2004, 11:35 PM
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#2
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
nah............
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| Malmz |
Mar 27 2004, 11:54 PM
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#3
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CSOBOSC founding member Group: Benefactors Posts: 489 Joined: 22-April 03 From: So. Cal Member No.: 602 |
Not bad if you don't mind push-starting the car everywhere... (no provision for starter) (IMG:style_emoticons/default/smile.gif)
sm |
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| Brad Roberts |
Mar 28 2004, 01:24 AM
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#4
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Use a stock GM starter (it bolts to the block.)
Howard, several GT40 kit car manufacturers use a 944/924Turbo/Audi box. They are not much stronger than a 901. B |
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| Malmz |
Mar 28 2004, 01:35 AM
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#5
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CSOBOSC founding member Group: Benefactors Posts: 489 Joined: 22-April 03 From: So. Cal Member No.: 602 |
"O". Do the ring teeth mesh ok, or do you do something different to the starter gear or the ring gear?
sm |
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| Brad Roberts |
Mar 28 2004, 01:38 AM
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#6
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
They sell a smaller diameter flexplate that the flywheel mounts too. They then use a starter that is offset to match the smaller flexplate. Works pretty slick.
B |
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| eresener |
Mar 28 2004, 05:15 AM
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#7
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Dr. Sawsall Group: Members Posts: 218 Joined: 17-October 03 From: Missouri Member No.: 1,252 |
Brad,
Does this mean that you could put the automatic in the teener? Ed |
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| Howard |
Mar 28 2004, 10:35 AM
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#8
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Incontin(g)ent Member Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None
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Brad, we have to solve this transmission thing in order to produce sbc 914's in any volume. The 901 seems strong enough to handle a stock 350, but final drive ratio is way off too.
C'mon genius, what's the answer? Think cheap and strong. |
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| r_towle |
Mar 28 2004, 10:59 AM
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#9
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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When you put more HP through the 901 tranny, what parts fail?
Is it possible to re-engineer the weak links in the 901 box to make a more reliable tranny? I have never found a clear answer to what exactly breaks??? Rich |
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| ArtechnikA |
Mar 28 2004, 11:36 AM
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#10
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
QUOTE(r_towle @ Mar 28 2004, 08:59 AM) Is it possible to re-engineer the weak links in the 901 box to make a more reliable tranny? of course ! and when you do this exercise - you will have re-engineered - the 915 ! Porsche already went down this path 30 years ago... you can re-invent that path if you like, or you can take advantage of someone else's engineering and fast-forward to what's being used in cars that develop that kind of torque now. what fails? the overhung 1st, R&P, bearings, intermediate plate... Porsche abandoned the 901 with the 2,4-liter engine producing about 150 lbs-ft of torque. |
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| Howard |
Mar 28 2004, 11:51 AM
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#11
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Incontin(g)ent Member Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None
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Otto does 901 modifications (new intermediate plate/gearing/blah blah) to handle 300hp. He quoted me $3500ish, a bit rich for my intention here. Otto?
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| Brad Roberts |
Mar 28 2004, 12:00 PM
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#12
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
The 901 doesnt last (EVER) I dont care who builds it. I'll argue it face to face with "John"
Unless you make a new R+P and increase the size of the pinion bearing and input shaft bearings (on both ends) all you have is a time bomb waiting to happen. The 930 box works because the R+P is the same size as a FORD 9 inch rear end (which is used all over the world in drag racing). The synchros and gear sets in the 930 are the same physical size as a Muncie 4 speed "Rock Crusher". Our answer is the G50 with it's larger bearings, super thick R+P and "Borg Warner" style sychro's. The problem is: it is physically larger than the 930 box which barely fits length wise. I wish I had a magic wand that I could sweep over every 901 and make it strong.. not gonna happen. Their are plenty of mid-engine boxes that will work.. people just wont spend 10k to solve the issue (think Mindeola or Wiseman) B |
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| Brad Roberts |
Mar 28 2004, 12:03 PM
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#13
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Oh.. people where asking what fails:
The pinion teeth leave the building. It is physically too small to handle the torque of a V8. The ring gear normally hangs in there. I have been blowing up 901's behind V8's for 10+ years. I didnt just slap another one in without figuring out what was failing. Oh.. the 901 cases are becoming junk. The main pinion bearing race is loose in over 75% of them. B |
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| Howard |
Mar 28 2004, 12:49 PM
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#14
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Incontin(g)ent Member Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None
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Shit, Brad, don't start an argument with John. I only have one 'Asshole' hat (IMG:style_emoticons/default/laugh.gif)
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| Brad Roberts |
Mar 28 2004, 12:56 PM
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#15
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
It's the only argument I have with John. He actually told me that we where not warming them up correctly... WTF ?? People with daily driver V8 cars dont wamr anything up EVER.
Most of us think one dimensional... what about the guy who downshifts without "blip throttle" ?? The second easiest way to blow up a 914 box.. downshift and let out the clutch on a V8 car with 914 box. B |
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| airsix |
Mar 28 2004, 01:26 PM
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#16
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I have bees in my epiglotis Group: Members Posts: 2,196 Joined: 7-February 03 From: Kennewick Man (E. WA State) Member No.: 266 |
I don't know squat, but here's what I think needs to be done:
1) Use a G50. Upside down. 2) Design a new trunk floor with a hump to accomodate an upside-down G50. 3) Put together a shift-linkage and parts for moving the tranny case vent. 4) Oh, and a tranny mount. Tony could fab that for you in short order. Like the nice mount you see on some of the 914's running 915 tranny's with the standard (not 916-style) rear cover. There. It's done. Nothing is going to break. Cost is around $3-4k per project (if you don't re-gear), and NOTHING is ever going to break whether you run 300hp or 700hp. Oh, and it will shift good. And the synchro's won't wear out. Bottom line is pay $300 for a 901 that's going to break, or pay $3k for a G50 that's not. I don't see many other options that will really work well and hold up to huge power without requiring huge R&D. -Ben M. |
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