 Ring and pinion gears., Gear ratios. |
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| Keith914 |
 May 29 2017, 08:24 AM
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#1
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Member  Group: Members Posts: 248 Joined: 29-April 16 From: Laguna Beach, California 92651 Member No.: 19,948 Region Association: Southern California  |
What are the practical (including cost) options to change the ring and pinion gears to "lengthen" all the gears so as to optimize a more powerful engine?
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| Steve |
May 29 2017, 01:35 PM
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#2
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914 Guru Group: Members Posts: 6,028 Joined: 14-June 03 From: Laguna Niguel, CA Member No.: 822 Region Association: Southern California 
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Wouldn't you want a higher ring & pinion to raise the gears? With the 915 Porsche went from 7:31 to 8:31 to raise / lengthen the gears. That sportomatic ring and pinion would lower the gears.
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| Montreal914 |
May 29 2017, 02:07 PM
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#3
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Advanced Member Group: Members Posts: 2,071 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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QUOTE(Steve @ May 29 2017, 12:35 PM)  Wouldn't you want a higher ring & pinion to raise the gears? With the 915 Porsche went from 7:31 to 8:31 to raise / lengthen the gears. That sportomatic ring and pinion would lower the gears. I thought the OP was looking for options for a taller ring and pinion since he has a bigger output engine. Stock is 7:31, and Sporto is taller 7:27. Easiest is what Mark Henri suggested with different ratios. I always think that A-F (first, second) are low for torquey engines, hence taller R&P, but I don't have experience with these types of engine. (IMG:style_emoticons/default/dry.gif) |
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Posts in this topic
Keith914 Ring and pinion gears. May 29 2017, 08:24 AM
Perry Kiehl IIRC there weren't options on R&P only gea... May 29 2017, 09:18 AM forrestkhaag A one-day-newbie to gears with a more powerful en... May 29 2017, 09:33 AM Mark Henry Most Porsche gearing changes are through the gears... May 29 2017, 09:38 AM Mark Henry What is a more powerful engine? A /6? V8?
The 901... May 29 2017, 09:46 AM forrestkhaag My early read is that it is as much an issue of th... May 29 2017, 09:52 AM Steve AFAIK the 901 gear box only supports a 7:31 ring a... May 29 2017, 10:15 AM Steve :bump:
For added Gear Calculator link in above po... May 29 2017, 12:11 PM Dave_Darling If you have a 915 gearbox, there were a couple dif... May 29 2017, 12:30 PM
Chris914n6
The easier way to go is tires with a larger overa... May 29 2017, 04:00 PM Montreal914 What about the 7:27 R&P from the Sportomatic?
... May 29 2017, 12:33 PM Steve
Wouldn't you want a higher ring & pinion... May 29 2017, 08:43 PM Montreal914
[quote name='Montreal914' post='2490876' date='Ma... May 29 2017, 11:47 PM Perry Kiehl I thought the '73 stock gearing worked pretty ... May 30 2017, 05:41 AM Mark Henry A healthy 3.0 can start in 2nd no problem on every... May 30 2017, 05:56 AM rick 918-S Don't forget that part of the cooling on an ai... May 30 2017, 06:26 AM Mark Henry
Don't forget that part of the cooling on an a... May 30 2017, 10:33 AM Steve Good point Rick. Even though my speedo says 80 mp... May 30 2017, 07:49 AM Keith914 Thanks for all your responses. I hope to have my c... May 30 2017, 08:40 AM Steve
Thanks for all your responses. I hope to have my ... May 30 2017, 08:51 AM |
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