<VV> Corvair Powered Porsche

[JVHRoberts at aol.com]

You may want to look at the newer gearboxes, even as new as the G50. These  
Porsches have taller final drives better suited to a Corvair engine. And a used 
 one of these is probably cheaper than regearing a 901 box.
Just a thought...
There are online resources that list nearly all the available ratios for  
Porsche trannies. Such as:
 
_http://members.rennlist.com/chuxter/901&915ratios.htm_ 
(http://members.rennlist.com/chuxter/901&915ratios.htm) 
 
Enjoy!!
 
In a message dated 4/19/2007 10:14:56 A.M. Eastern Daylight Time,  
jwcorvair at aol.com writes:

Because  I have a Porsche 912 with a Corvair engine that I drive frequently, 
I thought  that I would add my observations to the general discussion. My car 
uses a  reverse rotation Corvair engine mated to a 1968 911 901 five speed  
transmission. My engine uses a Rochester four barrel on a center adapter for  
110 heads. (Yeah, this is probably a bit more carb than needed for the 110  
head, but that's the way it came.) Here is the issue with the Corvair engine  
mated to the 911 transaxel: The torque curve of the Corvair engine is not well  
suited to the gear ratios of the 911 transaxel. I can easily start in second  
gear. The gear ratios are so close, my best acceleration is when I make 1-3-5  
shifts, which I can do without bogging the engine. I can have the gear box  
rebuilt with different ratios, but that is an expensive proposition (after  all, 
it is a Porsche gear box). Also, the early 901 transaxel has one of the  
poorest shifting gear boxes that I have ever experience. And it is not  on
ly my gearbox. Every early 901 I have driven is so vague, it is quite  easy 
to nick reverse when shifting from first to second. (The early 901 gear  boxes 
have first to the left and back. Reverse is to the left and forward.  This 
leaves second through fifth in the H pattern.)


 



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