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Join Date: Sep 2005
Location: ny
Posts: 199
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weber carb problem at high rpm's
the engine is a 1970 911t motor. It has webers and a MSD ignition unit. the car starts and idles very nicely. Mid range seems good also, but once i get into the higher rpms the car dogs. any suggestions and is there any more info you need to help me solve my problem.
thanks -Larry
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Love cars lucky i got an early start 1989 911turbo project 1928 rolls royce |
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09-03-2008, 10:05 AM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Check fuel filter, then fuel pump pressure and volume. If filter is located before the test port, that's included. High speed lack of power is a typical symptom for a borderline pump.
A compression test provides a good reference point for engine integrity, just to be sure. Of course, check the easy stuff too (ignition timing, plug wire insulation, dist. cap/rotor, etc.). Sherwood |
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09-03-2008, 10:17 AM
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Location: ny
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what fuel pressure should i be running? there is a fuel pressure regulator on this car that is adjustable.
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Love cars lucky i got an early start 1989 911turbo project 1928 rolls royce |
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09-03-2008, 05:29 PM
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Location: So. Calif.
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I suggest checking fuel pressure and volume with and w/o the FPR. Suggested fuel pressure for Webers is 3.5-4psi. Fuel volume with engine OFF and FP energized is about 1 liter/min. minimum.
Sherwood |
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09-03-2008, 11:21 PM
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Location: ny
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cool ill check that today. I have been running 5psi.
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Love cars lucky i got an early start 1989 911turbo project 1928 rolls royce |
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09-04-2008, 03:58 AM
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Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,468
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next size smaller air corrector jets can help. they get more out of the mains at top end without having to use larger mains.
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09-04-2008, 04:25 AM
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