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Sorry to dredge up an old post, but I am chasing a horsepower issue with my 1982 911SC. It does not have Buckley headers. The engine sounds good and responsive, but is only making 175hp at the rear wheels. The strong cars in class are making 215-220hp at the wheels. After a very exhaustive study of the engine with people who know these engines I am still nowhere.
A/F ratio 14 at idle and 12 at redline - a little rich and I am still working it up a little at a time
Timing 36 btdc on 98 octane race fuel
Compression is 155psi on five of the six cylinders, but cylinder #1 is only 135psi. Leak down was good with the worst cylinder only 3.8%. I am getting ready to pull the engine to change the pilot bearing and throwout bearing and am thinking about a valve job while the engine is out.
Any ideas would be timely as the engine is coming out this week
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