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Old 11-13-2018, 09:31 PM   #17
Racer Boy
Racer Boy
 
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Join Date: Sep 2015
Location: Seattle, WA
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Quote:
Originally Posted by j.fro View Post
Very interesting! Does anyone have power numbers or Dyno charts showing gains from using the 996 manifold on the 3.2? I'm really interested to see just how much power could be made with our 3.2. Given that the 2.0 in the 1967 911R & 904 made 220, why can't we get 350 from the 986 S motor?
Back in 1967 the HP numbers were gross, not net. The difference is that they could measure the output with no accessories attached, open exhaust, no air cleaners, etc, in whatever temperature and conditions the maker wanted. Now the numbers are far more accurate, because the conditions of the measurement are standardized, and all the accessories are attached and functional.

Your 220 HP in 1967 would probably measure under 200 HP using the SAE net ratings.

You can read up about it here - https://ateupwithmotor.com/terms-technology-definitions/gross-versus-net-horsepower/
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