Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> Which 901s had the "GB" mainshaft?, Need some technical expertise from the club!
race914
post Mar 24 2007, 09:18 AM
Post #1


73 914-4
***

Group: Members
Posts: 1,006
Joined: 31-October 05
From: Nipomo, California (Central Coast)
Member No.: 5,027
Region Association: Central California
Need some help from the club with the technical data to identify if a 901 transaxle has a F, GA, or GB mainshaft.

This is a question from a current classified ad

I'm fine tuning my gearset for Laguna Seca, and the F second gear mainshaft in my 73 914-4 901 is too low for turn 11 so I'm looking for a GB mainshaft.

I know I could go to a 904 mainshaft which would allow me to switch out 2nd gears, but that is alot more $$$

Thanks in advance for your replies

From the technical expertise on this site, I know someone probably has this memorized! (IMG:style_emoticons/default/pray.gif)

Thanks again,

Greg
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
davep
post Mar 24 2007, 11:27 AM
Post #2


914 Historian
*****

Group: Benefactors
Posts: 5,143
Joined: 13-October 03
From: Burford, ON, N0E 1A0
Member No.: 1,244
Region Association: Canada
http://members.rennlist.com/chuxter/901&915ratios.htm

Does not indicate the GB was an actual mainshaft combo. That is, I would expect from this chart that GB was a ratio for the 914 mainshaft only.

When obtaining a mainshaft (not 904), you need to get the mating 2nd gear with it.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Martin Baker
post Mar 24 2007, 11:36 AM
Post #3


I just heard I sold my cars!
***

Group: Members
Posts: 1,140
Joined: 11-February 03
Member No.: 290
Region Association: Northern California
Sorry to have caused all this trouble Greg!

And allow me to THANK YOU for being my Instructor at Laguna Seca for my first time there. I learned allot in a short time!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Aaron Cox
post Mar 24 2007, 12:30 PM
Post #4


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
QUOTE(davep @ Mar 24 2007, 10:27 AM) *

http://members.rennlist.com/chuxter/901&915ratios.htm

Does not indicate the GB was an actual mainshaft combo. That is, I would expect from this chart that GB was a ratio for the 914 mainshaft only.

When obtaining a mainshaft (not 904), you need to get the mating 2nd gear with it.


second gear ratios i know of
F, GA mainshafts
H,HA,HB,I second gears you could put in a 4 speed or on a 904 shaft
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bondo
post Mar 24 2007, 12:34 PM
Post #5


Practicing my perpendicular parking
****

Group: Members
Posts: 4,277
Joined: 19-April 03
From: Los Osos, CA
Member No.: 587
Region Association: Central California
I've got an A mainshaft if you want to go 4 speed.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Aaron Cox
post Mar 24 2007, 12:35 PM
Post #6


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
great paperweights, you need any more? (IMG:style_emoticons/default/rolleyes.gif) (IMG:style_emoticons/default/chairfall.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Mar 24 2007, 03:57 PM
Post #7


Custom Member
***************

Group: Members
Posts: 24,574
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
I thought Chris Foley figured out a way to remove the 2nd gear..
It could just be placing the shaft in a lathe and removing it, and then I think, could be wrong...that you can then put on the other gears mentioned..not sure about any of this...but I know Chris knows..

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
race914
post Mar 24 2007, 09:08 PM
Post #8


73 914-4
***

Group: Members
Posts: 1,006
Joined: 31-October 05
From: Nipomo, California (Central Coast)
Member No.: 5,027
Region Association: Central California
QUOTE(Martin Baker @ Mar 24 2007, 10:36 AM) *

Sorry to have caused all this trouble Greg!

And allow me to THANK YOU for being my Instructor at Laguna Seca for my first time there. I learned allot in a short time!



This is all Martin's fault. I was happy 'bogging' out of turn 11 at laguna at 3200 rpm with my Ka 3rd gear until I rode in Martin's car! Boy does his car LAUNCH out of turn 11 in 2nd with his "airport gearset"! (IMG:style_emoticons/default/drooley.gif)

Thanks to everyone for your replys. I'll update this thread with what I find and what I end up with...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
race914
post Mar 24 2007, 09:26 PM
Post #9


73 914-4
***

Group: Members
Posts: 1,006
Joined: 31-October 05
From: Nipomo, California (Central Coast)
Member No.: 5,027
Region Association: Central California
QUOTE(Aaron Cox @ Mar 24 2007, 11:30 AM) *

QUOTE(davep @ Mar 24 2007, 10:27 AM) *

http://members.rennlist.com/chuxter/901&915ratios.htm

Does not indicate the GB was an actual mainshaft combo. That is, I would expect from this chart that GB was a ratio for the 914 mainshaft only.

When obtaining a mainshaft (not 904), you need to get the mating 2nd gear with it.


second gear ratios i know of
F, GA mainshafts
H,HA,HB,I second gears you could put in a 4 speed or on a 904 shaft


Hi Aaron,

The H 2nd gear looks awesome on the gear calculator. I talked with the Carquip.com guys and they do have repro 904 mainshafts and an H gear, but it's big $$$. They sell the GB mainshaft (which after this thread I'm not sure what ratio 2nd it really is...) for $400, but they don't currentlyl have any.

Thanks for the ratio info. Hope to see you at an event this year if I ever wander down south!

Greg
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Aaron Cox
post Mar 24 2007, 09:28 PM
Post #10


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
QUOTE(r_towle @ Mar 24 2007, 02:57 PM) *

I thought Chris Foley figured out a way to remove the 2nd gear..
It could just be placing the shaft in a lathe and removing it, and then I think, could be wrong...that you can then put on the other gears mentioned..not sure about any of this...but I know Chris knows..

Rich


i think he cut off an F second and welded on an I gear.

i guess you could cut it and spline ala a 904 shaft
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bondo
post Mar 25 2007, 01:02 AM
Post #11


Practicing my perpendicular parking
****

Group: Members
Posts: 4,277
Joined: 19-April 03
From: Los Osos, CA
Member No.: 587
Region Association: Central California
QUOTE(Aaron Cox @ Mar 24 2007, 10:35 AM) *

great paperweights, you need any more? (IMG:style_emoticons/default/rolleyes.gif) (IMG:style_emoticons/default/chairfall.gif)


Kinda long for a paperweight.. but it makes a great clutch alignment tool. (IMG:style_emoticons/default/biggrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 17th May 2024 - 05:23 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
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 ...