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Old 10-15-2018, 08:29 AM   #1
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tandem oil pump

so, the 9x7 cars have a vacuum/oil tandem pump. apparently provides better vacuum for brake booster, resonance flapper, etc. from what i can see, 9x6 and 9x7 oil pumps are interchangeable (parts catalogs actually carry a 997 part number for 986 oil pumps).

so, question is - anyone swapped in a later pump on their car for better vacuum?
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Old 10-15-2018, 08:48 AM   #2
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.....hmmm i still haven't even done the little 997 pressure plunger!
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00 986 S....with a few tweaks
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Old 10-15-2018, 08:52 AM   #3
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And I thought on the 986/987 cars the intake supplied vacuum to those users and also vacuum to the crankcase through the AOS.

Edit; After a search I see this as a requirement for a turbo since intake may be pressurized and not under vacuum.

Last edited by 911monty; 10-15-2018 at 08:58 AM.
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Old 10-15-2018, 09:03 AM   #4
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for brakes, resonance flapper, secondary air injection, 9x6 cars got vacuum from intake; 9x7 cars got vacuum from the pump. aos gets vacuum from the intake on both.
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