 914 transmission reversability, using a 914 transmission with a rear CCW engine |
|
|
|
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. |
|
|
  |
| llopness |
 Jul 26 2012, 01:38 PM
Post
#1
|
|
Newbie  Group: Members Posts: 3 Joined: 1-April 11 From: York, NY Member No.: 12,884 Region Association: North East States  |
I've been thinking about getting a fiat 850. I like the look of it but I'm not stoked about it being four speed and it has a CCW engine
Would the Porsche 914 transmission I've got in my shop, be strong in reverse? rotating the engine 180 degrees so it's reverse facing and putting a CCW engine on it. thanks, Quentin |
   |
 
|
| ClayPerrine |
Jul 26 2012, 02:05 PM
Post
#2
|
|
Life's been good to me so far..... Group: Admin Posts: 15,520 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
|
QUOTE(llopness @ Jul 26 2012, 02:38 PM)  I've been thinking about getting a fiat 850. I like the look of it but I'm not stoked about it being four speed and it has a CCW engine Would the Porsche 914 transmission I've got in my shop, be strong in reverse? rotating the engine 180 degrees so it's reverse facing and putting a CCW engine on it. thanks, Quentin Running the 901 (aka 914) transmission input shaft backwards reverses the thrust loads on all of the shafts due to the bevel cut gears. That reduces the life of the transmission because those surfaces were never designed to be thrust bearings. That's why they made reverse rotation cams for the corvair engines they installed in dune buggies. The VW transmission needed the input shaft turning the correct direction. |
|
|
|
| Dr Evil |
Jul 26 2012, 03:40 PM
Post
#3
|
|
Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
|
I know nothing about the FIAT. What Clay says is true, but if the FIAT is a light car, it will be less of an issue. Still far from the optimal design, though.
|
|
|
|
| llopness |
Jul 27 2012, 06:07 AM
Post
#4
|
|
Newbie Group: Members Posts: 3 Joined: 1-April 11 From: York, NY Member No.: 12,884 Region Association: North East States |
it is a light car ~1600 lbs. one of it's major laments is that the engine is CCW so one must get a new trans to put anything else in. VW or Porsche 915.
is it possible to flip over the differential in the 901 tranny to make it rear engine-able for a CW engine? thanks |
|
|
|
| Dr Evil |
Jul 27 2012, 06:13 AM
Post
#5
|
|
Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
|
Possible, yes, but all gears and r/p will. Be turning with forces on the wrong side of the gear faces. Not an issue in higher gears, but for the r/p and the low gears it is a lot of strain.
However, 901 boxes are fairly cheap so you may not care about longevity. |
|
|
|
| bulitt |
Jul 27 2012, 08:09 AM
Post
#6
|
|
Achtzylinder Group: Members Posts: 4,188 Joined: 2-October 11 Member No.: 13,632 Region Association: South East States |
My dad bought a 1971 850 new, paid 2100$ for it. Two years later the transaxle had issues and it cost 750$ to repair. Fun car, no rust protection, when I was installing a rollbar found some italian sandwich bags and rubber cement containers left under the rear package ledge. :lol4
I do recall the trans being a very quick, short throw application. |
|
|
|
| Porschef |
Jul 27 2012, 09:47 AM
Post
#7
|
|
How you doin' Group: Members Posts: 2,165 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States
|
QUOTE I do recall the trans being a very quick, short throw application. Quick? Short throw? Whazzat? |
|
|
|
| Dr Evil |
Jul 27 2012, 04:19 PM
Post
#8
|
|
Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
|
What that is is a possibility with a well built 901 with a short shift kit (IMG:style_emoticons/default/wink.gif)
|
|
|
|
| llopness |
Jul 27 2012, 04:59 PM
Post
#9
|
|
Newbie Group: Members Posts: 3 Joined: 1-April 11 From: York, NY Member No.: 12,884 Region Association: North East States |
Short shift as in close gear ratios?
R/P? and was that a yes on differential reversability to replace the rearward CCW engine with a CW engine |
|
|
|
| messix |
Jul 27 2012, 05:08 PM
Post
#10
|
|
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 |
running on the coast side of the ring and pinion is bad too. never designed to run under power that way. that is the weak side of the gears.
i have a chunked front set of diff gears from my jeep to prove that pulling another rig in reverse is bad juju for ring and pinions. |
|
|
|
| Dave_Darling |
Jul 27 2012, 06:14 PM
Post
#11
|
|
914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
|
If the engine can be mounted transverse, check into Honda transaxles. Up through the early 90s at least their engines also turned "backwards".
I don't know of any longitudinal-mounted Hondas that have that same reverse rotation. --DD |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th June 2024 - 11:10 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.