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Scott Clarke Scott Clarke is offline
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Join Date: Apr 2002
Location: Eugene, Oregon
Posts: 1,115
The space cams are different between the two pumps, and they are not interchangeable. I don't know if there is a signifcant difference in the amount of fuel supplied by the two pumps, but it stands to reason that it is likely that the 2.2 pump would be a better choice. Either pump can be tweaked by Gus Phister to be better suited for your 2.5/2.6. I called Gus with the same concern, and he thought that my 2.2E pump would bwe OK in my 2.5 with E cams. He said that the tendency would be for the car to run rich at low RPMs when properly adjusted for high RPM use. I think he said that the internal adjustments he could do would run about $300. I'm going to get the car running and see how it is. Gus did say that the 2.2S pumps seem top work fine on 2.7RS spec motors, so I would think you'd be fine at 2.5 or 2.6.
'70 911E short stroke 2.5 MFI. Sold
'56 Cliff May Prefab
Old 03-23-2005, 08:14 AM
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