Re: How much vaccum
[Re: AndyF]
#2737708
01/29/20 01:27 PM
01/29/20 01:27 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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To bounce off what Andy stated, MOST bracket engines will not be capable of making anywhere near 20" of vacuum, many pumps out there also will not build 20" either, especially with a wet sump oiling system. FWIW we run a Moroso 3 vane on the dragster and make 14-15" my car is an enhanced 4 vane and can see 19-20", we run both unregulated, both were built to run a vacuum pump. The heads up car we can get 22" with a wet sump, that's a very high number on a wet sump. Most bracket engines will be 8-10". Is there power there, that is debatable but you will eliminate any pesky oil leaks for sure.
"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: How much vaccum
[Re: 340Cuda]
#2738024
01/30/20 10:55 AM
01/30/20 10:55 AM
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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 run the Moroso four vane also and set it for 12" . Same here. MUCH better pump than the POS Aerospace pump I had before.
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: How much vaccum
[Re: an8sec70cuda]
#2738673
02/01/20 11:47 AM
02/01/20 11:47 AM
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Joined: Sep 2003
Posts: 1,049 San Jose Ca.
boatracer572
super stock
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super stock
Joined: Sep 2003
Posts: 1,049
San Jose Ca.
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These are the seals I run., double lip...the rear main seal highest qualty seal I have ever used and the seals they offer for jesel drives are just as nice....I run a older moroso 5 stage dry sump pump and a product eng. 5 vain vacuum pump. I’ve seen 23” of vacuum. vacuum =power
Last edited by boatracer572; 02/01/20 12:22 PM.
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Re: How much vaccum
[Re: Sammy]
#2738697
02/01/20 12:34 PM
02/01/20 12:34 PM
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Joined: Sep 2003
Posts: 1,049 San Jose Ca.
boatracer572
super stock
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super stock
Joined: Sep 2003
Posts: 1,049
San Jose Ca.
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My problem I see is when I crank on my vacuum pump knob is the higher the vacuum goes, my ok pressure drops significantly which makes me uncomfortable. to get and maintain high vacuum with out problems, requires a lot more than just seals to seal up the engine. I have never seen my motor ever fall below 85 psi during a run....
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Re: How much vaccum
[Re: Sammy]
#2738711
02/01/20 01:08 PM
02/01/20 01:08 PM
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Joined: Jan 2003
Posts: 31,036 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,036
Oregon
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My problem I see is when I crank on my vacuum pump knob is the higher the vacuum goes, my ok pressure drops significantly which makes me uncomfortable. Your oil pump is still working the same so your bearings still have the same oil pressure, the gauge reference point has just been moved.
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Re: How much vaccum
[Re: 64hemi330sedan]
#2738735
02/01/20 02:13 PM
02/01/20 02:13 PM
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Joined: Aug 2003
Posts: 43,185 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,185
Bend,OR USA
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I try to not run more than twelve. my engine builder is worried that it might pull oil away from the piston pins and rings. I learn a long time ago on wrist pin clearance a tiny bit to tight is no good, IE .0010 clearance or less on any stock BB Mopar wrist pin is to tight On my motors using BB type Chevy rods with .990 wrist pin size I ask the machine shop to make sure they have .0010+ clearances I base this on .0010 oil clearances for each inch in diameter on any rotating wear surfaces in our motors
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: How much vaccum
[Re: dvw]
#2738841
02/01/20 10:18 PM
02/01/20 10:18 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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As stated your oil pressure is not changing. Just the reading is and I find most guys run WAY to much oil pressure anyway. Not that its a bad thing as I have done both just seems most run more than necessary for sure.
"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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