Join Date: Jul 2006
Location: Northfield, Illinois
It's not so much a choice. Most current aftermarket pumps have 9 tooth straight cut teeth. These are not ideal for engines that run faster than stock 2L FI engines, for a number of design / engineering reasons. They are FINE for their intended application. Most of the older higher speed engines and race engine builders prefer the 9 tooth helical pumps, which are no longer made as a quality, after-market product. Below are 2 photos. the first shows a straight cut 2L pump bottom. Note the LARGE live center lathe cut in the main shaft. This can be used to identify a straight cut gear pump without disassembly.
The second photo shows on the left, a main shaft without the LARGE live center cut and 9 tooth helical drive gear. The right in the second photo shows the 2L main shaft end with live center, and straight cut 9 tooth drive gear. These visual clues will give you an idea which pump you have.
Should you need more oil pump information, contact me by PM with your e-mail contact information.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Illinois SNO Alfa Chapter Director
Illinois SNO Ferrari Chapter Director
and sometimes, CONFUSED AND INCORRECT, but Larry helps me out.
Illinois Chapter Director AND Charter Member of THE CONFUSED AND INCORRECT
Last edited by Gordon Raymond; 09-06-2018 at 09:26 AM.
Reason: No photos?