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Old 07-13-2019, 11:13 AM   #1
donny308
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Default moroso vacuum pump

I have a 3 vane moroso vacuum pump with the relief valve on the pump. problem is that even with the relief wound out to its maximum I'm still getting 17inches of vacuum over the finish line.

should I put another relief on the valve cover or slow the pump down?

I'm aiming for 14-15

Last edited by donny308; 07-13-2019 at 11:14 AM. Reason: forgot
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Old 07-13-2019, 11:53 AM   #2
classracer
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Default Re: moroso vacuum pump

how are you verifying this and if true, change the pulley size.
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Old 07-13-2019, 12:26 PM   #3
Outlaw Bill
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Default Re: moroso vacuum pump

Nothing wrong with 17 in of vacuum i would leave it alone.
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Old 07-13-2019, 12:35 PM   #4
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Is it a wet sump or dry sump engine?

Steve
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Old 07-13-2019, 04:49 PM   #5
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wet sump
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Old 07-13-2019, 04:51 PM   #6
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Default Re: moroso vacuum pump

bigger pulley on the pump too slow down?
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Old 07-13-2019, 06:01 PM   #7
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Default Re: moroso vacuum pump

Remove the relief from the valve cover and slow the pump down.
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Old 07-13-2019, 09:00 PM   #8
Randy Wilson
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Default Re: moroso vacuum pump

I really donít know what the problem is. Iíve seen wet dumps pull 20Ēís with no problem.
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