Building strong 914 tranny, Which are the most important items? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Building strong 914 tranny, Which are the most important items? |
dkjens |
Mar 8 2009, 11:47 AM
Post
#1
|
Member Group: Members Posts: 159 Joined: 24-November 08 From: Pasadena, CA Member No.: 9,785 Region Association: None |
So, I just picked up another 914 tranny, so now I have the one in my '73 and this newly acquired tranny. I will have a local shop owner and really great friend build me one good 914 tranny with the gear spacing for V8s. What can I do (spend) money on during this transmission rebuild to make it as strong as possible, in addition to the billet intermediate plate?
I figure we'll take both trannys apart, lay out the gears, synchros etc., pick the best parts (hope both 2nd gear sets are in good shape), 1st and 2nd stays stock, reversed 4th becomes 3rd, reversed 3rd becomes 4th and reversed 2nd becomes new 5th. New bearings and synchros if needed, although they work fine in the tranny in my car. So, definately, the billet intermediat plate, there's $400.00, do I need oil cooler/pump and which system would be the best bang for the buck? The car is/will be a fun street car, 911SC brakes all around, Kennedy 9" clutch, at the moment mild Chevy 283 (est. 200-250HP) but later in the year Chevy 350 (400-500HP) so may look for ceramic clutch plate (with springs if possible for a little engage slippage). I have never been on the track so I can guarantee that I am a lot less agressive driver than most on this board (IMG:style_emoticons/default/driving.gif) |
d914 |
Mar 8 2009, 12:07 PM
Post
#2
|
Advanced Member Group: Members Posts: 2,331 Joined: 12-July 03 From: Atlanta, ga Member No.: 904 Region Association: South East States |
Im not a tranny guy but some take first out, others use just to move around the shop or on to trailers,,,,donot use first normally.....you will shear it off..
|
Cap'n Krusty |
Mar 8 2009, 12:44 PM
Post
#3
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
How are you gonna reverse 2nd? You have a 904 mainshaft? Shame to waste that on a conversion ............... The Cap'n
|
dkjens |
Mar 8 2009, 12:48 PM
Post
#4
|
Member Group: Members Posts: 159 Joined: 24-November 08 From: Pasadena, CA Member No.: 9,785 Region Association: None |
I know not to use 1st except for as described. Is 2nd solidly on the shaft? If I do have to waste a shaft it's not a big deal to me, I paid $140.00 for this tranny with axles,
|
SirAndy |
Mar 8 2009, 01:05 PM
Post
#5
|
Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
at the moment mild Chevy 283 (est. 200-250HP) The stock 901 will work fine for that ... but later in the year Chevy 350 (400-500HP) You should consider a 915 or a 930 for that kind of HP. Your 901 won't last long with 500HP, no matter how much $$$ you throw at it ... (IMG:style_emoticons/default/bye1.gif) Andy |
Bruce Hinds |
Mar 8 2009, 03:32 PM
Post
#6
|
V-8 madness Group: Members Posts: 733 Joined: 27-December 06 From: Port Orchard, WA Member No.: 7,391 Region Association: Pacific Northwest |
The wide gear spacing works well with the V8. I think Renegade and others take first out so it won't be used, you can really tear up the box with first. But, you won't want to use first, second with the v8 is like a normal v8 and first gear. That being said, you may find first helpbul in stop and go traffic, starting on a steep hill inching along through parking lots with speed bumps. I've kept mine and I'm glad I have it.
As for the engine swap, I'd just go with a 327 or 350 and you may not want the big motor. The 901 is good for a little over 300HP if you don't drag race and do burn outs. It'll take revs, but not torque. The extra 50-100 hp will cost you big money to go to a stronger box. That being said, 500HP would be a HOOT! B |
ConeDodger |
Mar 8 2009, 04:46 PM
Post
#7
|
Apex killer! Group: Members Posts: 23,587 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
If you are thinking about 500HP you can build a strong transmission like this: First, push all of those 901 parts over to the side of the garage and move a 915 in place of it. Second get the conversion parts and do 'er up... Unless you like expensive noises, in which case you need to report in at the asshat meeting hall (IMG:style_emoticons/default/biggrin.gif)
|
Cap'n Krusty |
Mar 8 2009, 07:27 PM
Post
#8
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Lest we forget, 915s have a nasty habit of exploding the 2nd gear synchro assembly ........
The Cap'n |
Todd Enlund |
Mar 8 2009, 08:06 PM
Post
#9
|
Resident Photoshop Guru Group: Members Posts: 3,251 Joined: 24-August 07 From: Laurelhurst (Portland), Oregon Member No.: 8,032 Region Association: Pacific Northwest |
If you are thinking about 500HP you can build a strong transmission like this: First, push all of those 901 parts over to the side of the garage and move a |
jimkelly |
Mar 8 2009, 08:09 PM
Post
#10
|
Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
are you gonna be running fat rubber ( flared car ) or fat sticky rubber?
i hear big HP and traction will be your transaxle's enemy. i hear a 930 box run upside down is the hot lick for big horsepower and grippy rubber. jim |
Todd Enlund |
Mar 8 2009, 08:36 PM
Post
#11
|
Resident Photoshop Guru Group: Members Posts: 3,251 Joined: 24-August 07 From: Laurelhurst (Portland), Oregon Member No.: 8,032 Region Association: Pacific Northwest |
are you gonna be running fat rubber ( flared car ) or fat sticky rubber? i hear big HP and traction will be your transaxle's enemy. i hear a 930 box run upside down is the hot lick for big horsepower and grippy rubber. jim I hear a 930 box run upside down doesn't oil the pinion properly... I hear you should machine the case to flip the ring. (IMG:style_emoticons/default/confused24.gif) |
Dr. Roger |
Mar 8 2009, 09:18 PM
Post
#12
|
A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
IMHO, the chevy 283 and the rare 302 are the perfect motors for this car.
400+HP will nuke your tranny in short order, intermediate plate or not. my car is pushing about 350 to 375HP and I don't exactly baby it. And still i managed to over stress what i believe to be the intermediate bearings at about 2000 miles. in hind sight, i'd be better off going for a less torquey 327/302/283, or blow some bigger bucks on the 930 or 915 transaxle seen here... http://longisland.craigslist.org/pts/1065158675.html this is what yo really need..... ;-) http://cgi.ebay.com/ebaymotors/ZF-TRANSAXL...sQ5fAccessories ZF tranny for sale http://www.gt40s.com/forum/gt40-parts-sale...saxle-sale.html GT40 6 speed.... http://www.gt40s.com/forum/gt40-tech-power...sa-rebuilt.html more torque requires more dollars to support it. unless you've got some good discretionary/disposable income, i'd stick with the shorter stroke V8's. *EDIT and that 283 will shorten the lifespan of your CV's if you haven't already upgraded.... ;-) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/aktion035.gif) |
dkjens |
Mar 8 2009, 09:26 PM
Post
#13
|
Member Group: Members Posts: 159 Joined: 24-November 08 From: Pasadena, CA Member No.: 9,785 Region Association: None |
Well, looks like I'll just put a little money into building a good 914 tranny, and then build another nice 283, aluminum heads, etc., I am sure I'll be perfectly happy with a good running 283.
Thanks for all you input. EDIT. And Dr. Roger, if I had $8k I'd come up and get your car. |
SirAndy |
Mar 8 2009, 09:28 PM
Post
#14
|
Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
I hear a 930 box run upside down doesn't oil the pinion properly... I hear you should machine the case to flip the ring. (IMG:style_emoticons/default/confused24.gif) I've seen it done either way. Machining the case to flip the R/P is not as big a deal as it sounds. Working out a good shifter arrangement is much more of a hassle ... (IMG:style_emoticons/default/popcorn[1].gif) Andy |
messix |
Mar 8 2009, 09:39 PM
Post
#15
|
AKA "CLUTCH KILLER"! Group: Members Posts: 6,995 Joined: 14-April 05 From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada Member No.: 3,931 Region Association: Pacific Northwest |
Well, looks like I'll just put a little money into building a good 914 tranny, and then build another nice 283, aluminum heads, etc., I am sure I'll be perfectly happy with a good running 283. Thanks for all you input. EDIT. And Dr. Roger, if I had $8k I'd come up and get your car. find an early 327 block [small crank journal] and throw the 283 crank in with some 302 pistons [a little spendy] and then you have a bore that can take heads that will breath and the short stroke to make a high winding lower torque engine. |
Bruce Hinds |
Mar 9 2009, 10:22 AM
Post
#16
|
V-8 madness Group: Members Posts: 733 Joined: 27-December 06 From: Port Orchard, WA Member No.: 7,391 Region Association: Pacific Northwest |
The 283 and 302 are great motors, but you can get a lot more for the less money than spending for the aluminum heads and strong valve train stuff.
I've got an over bored 327 that equals 331 cu in. Comp cam hydrolic cam that comes on at about 1800 rpm and will twist to 6500 with some free flowing heads. When I did this I found that I never really turned it up that high but a few times. Over 5500 you are really stressing the standard valve train and unless you will be spending a lot of time in the +5500 RPM range you won't need the 2.02 intakes. 1.94 valves will serve you much better. Cam is the key and there has been a bunch of discussion in the exhuast area too with how to put in a crossover. Be careful, a crossover will improve torque! B |
dkjens |
Mar 9 2009, 01:59 PM
Post
#17
|
Member Group: Members Posts: 159 Joined: 24-November 08 From: Pasadena, CA Member No.: 9,785 Region Association: None |
So if I'm looking for a 327 block for a small journal 283 crank, what production years am I looking for?
I'm already loooking on Craigslist and there are many 327s available. The 327 would be a 4" bore and 3.25" stroke, correct? |
jmmotorsports |
Mar 9 2009, 02:13 PM
Post
#18
|
Member Group: Members Posts: 308 Joined: 15-August 06 From: Kelso,Wa. Member No.: 6,658 Region Association: Pacific Northwest |
So if I'm looking for a 327 block for a small journal 283 crank, what production years am I looking for? I'm already loooking on Craigslist and there are many 327s available. The 327 would be a 4" bore and 3.25" stroke, correct? I have an early 327 short block assy. I would like to sell. PM or email if interested. Jerry |
yokesman |
Mar 9 2009, 04:52 PM
Post
#19
|
Newbie Group: Members Posts: 5 Joined: 9-February 09 From: vita, ca Member No.: 10,037 Region Association: None |
So if I'm looking for a 327 block for a small journal 283 crank, what production years am I looking for? I'm already loooking on Craigslist and there are many 327s available. The 327 would be a 4" bore and 3.25" stroke, correct? I have an early 327 short block assy. I would like to sell. PM or email if interested. Jerry |
MZM |
Mar 9 2009, 05:05 PM
Post
#20
|
Newbie Group: Members Posts: 36 Joined: 26-April 07 From: San Diego Member No.: 7,692 |
Thinking out of the box, have you looked at the Subaru tranny option? Folks here are doing that with a Suby motor, but why not for a SBC? Many of the conversion issues are already solved. The 5 speed units are easy to get and cheap [relatively]. For big hp/torque, there are gears and rebuilds that hold together with the 500 hp range engines.
Then there are the 6 speed units that will take 500 hp stock. Just another thought for you. Mike McBride |
Lo-Fi Version | Time is now: 16th May 2024 - 11:40 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |