Quote:
Originally Posted by AaronM
As long as you don't consider the pistons to be a part of the engine, you're essentially correct. Personally I'd consider the later, higher-compression pistons to be noticeably different. The 10 HP peak difference isn't much, but the overall torque curve feels a little more solid on the later engines.
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North America-spec 944's from 83-87 all had the exact same power output. In 1988 the compression was raised but I don't think it was even 10 hp. In 1989 with the 2.7L the HP was about 160 but torque was substantially improved, if that is the motor you're talking about.
Quote:
=AaronM]
Yes, the car will run as long as the DME and AFM match, but it will not run properly unless you're using the right DME for the engine. Pre-85.5 cars use ML 1.1 or ML 1.2, while post 1985.5 cars use ML 3.1. While the AFM is indeed the primary difference between the two, the pinout does differ for the harness connection, specifically with respect to the altitude compensation signal.
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Didn't know about the altitude signal difference. Good to know.