Re: Vacuum pump
[Re: rickraw]
#3069039
08/17/22 11:10 PM
08/17/22 11:10 PM
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Joined: May 2019
Posts: 712 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 712
Lake Villa Il
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Wet sump? Dry sump? What pump and pulley ratio currently?
I would smoke test it to see if you have any leaks to start.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: Vacuum pump
[Re: dvw]
#3069145
08/18/22 10:50 AM
08/18/22 10:50 AM
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Joined: May 2019
Posts: 712 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 712
Lake Villa Il
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Mine makes about 10-12" with 5 at idle. GZ pump. Same here. I can regulate it for 15 but adjusted to 10.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: Vacuum pump
[Re: rickraw]
#3069173
08/18/22 12:02 PM
08/18/22 12:02 PM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
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I have a 4 vane Moroso on my 575" hemi that pulls about 10" at WOT.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Vacuum pump
[Re: an8sec70cuda]
#3069487
08/19/22 10:43 AM
08/19/22 10:43 AM
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Joined: Jan 2004
Posts: 4,566 Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,566
Motor City
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I have a 4 vane Moroso on my 575" hemi that pulls about 10" at WOT. Same here on my 528" Hemi.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Vacuum pump
[Re: 6PKRTSE]
#3069530
08/19/22 12:05 PM
08/19/22 12:05 PM
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Joined: Jan 2003
Posts: 19,363 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,363
Las Vegas
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I have not had a BB of mine pull less that 15" of vacuum at WOT in YEARS,if it does not its leaking somewhere. Generally all 4 vane enhanced or Star pumps(seem to be a tad better) These are all aluminum block deals and wet sumps. The Stratus pulled 19" with a dry sump and vac pump.the one iron block we did when my son first started racing the dragster as his "training wheels" was a 446" stock block that we pulled 11" at WOT. FWIW the heads up car has seen 19" as a wet sump with a moroso 4 vane on an aluminum block driven by a serpentine belt. But it is a brand X deal.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Vacuum pump
[Re: rickraw]
#3070540
08/22/22 05:24 PM
08/22/22 05:24 PM
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Joined: Aug 2022
Posts: 1 New York
blakeadam
member
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member
Joined: Aug 2022
Posts: 1
New York
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I would have thort, if you had a good pump, you would have to set the relief to control your peak vacuum. I have 5" at idle & 10" at WOT with a Moroso 4 vane pump. As mentioned above, you might have a leak so maybe you need to test your system. I do know my pump is worth 0.12 to my ET. when it had a fail we looked at where the power went & found the pump drive was faulty. Once fixed the missing ET returned.
Last edited by blakeadam; 08/22/22 05:24 PM.
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