Re: Vac-u-pan effectiveness
[Re: Wirenut]
#2747494
02/28/20 07:07 PM
02/28/20 07:07 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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My car blows the one way valves out in the headers at least once a year. I always carry 2 spares. Engine braking in the shutdown just blows the plastic out.
Its annoying - I'm thinking of switching to the gm air pump For Chevy Express 1500 00-02 GM Original Equipment Secondary Air Injection Pump.
I dont think I have room for a dry sump and just need a little vacuum on my little 383. Will an electric do the trick ? Anybody have any real life experience. I don’t have space for mechanical . G I bought a electric one but havent put it on yet
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Re: Vac-u-pan effectiveness
[Re: MR_P_BODY]
#2747523
02/28/20 08:17 PM
02/28/20 08:17 PM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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They don't look big enough to do it. A 12 volt car vacuum (locate in the car's interior, pulls from hose through the firewall and dumps under the car) is way bigger, cheap, designed for continuous duty.
Boffin Emeritus
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Re: Vac-u-pan effectiveness
[Re: Wirenut]
#2747611
02/29/20 01:06 AM
02/29/20 01:06 AM
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Joined: Mar 2009
Posts: 2,467 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,467
Sydney,Australia
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Could you not run a brake vacuum pump ? Like subaru's run ? Also Aus holden commodores run them , sure be the same on chevys . They will pull up to 20" vacuum . Use an adjustable pressure switch to set . Plus the holden type , hella makes them i think , is quite small
Tex
Last edited by tex013; 02/29/20 01:07 AM.
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Vac-u-pan effectiveness
[Re: tex013]
#2747699
02/29/20 11:28 AM
02/29/20 11:28 AM
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Joined: May 2016
Posts: 630 Ct
Wirenut
mopar
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mopar
Joined: May 2016
Posts: 630
Ct
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Could you not run a brake vacuum pump ? Like subaru's run ? Also Aus holden commodores run them , sure be the same on chevys . They will pull up to 20" vacuum . Use an adjustable pressure switch to set . Plus the holden type , hella makes them i think , is quite small
Tex Hey Tex, Thanks for this. I was not aware that any of these pumps could draw that kind of vac. . Would need to come up with a trap for the oil/water pre pump. I will look into it. Alot of folks run methanol in your parts? G
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Re: Vac-u-pan effectiveness
[Re: Wirenut]
#2747765
02/29/20 03:20 PM
02/29/20 03:20 PM
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Joined: Oct 2014
Posts: 104 Washington
weedburner
member
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member
Joined: Oct 2014
Posts: 104
Washington
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Here's a link to the hybrid pcv/electric evac system I designed, been using it for around 10 years now with no issues. Worth a look if you have a street/strip car like mine... Hybrid PCV/Electric EVAC SystemGrant
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Re: Vac-u-pan effectiveness
[Re: weedburner]
#2747769
02/29/20 03:34 PM
02/29/20 03:34 PM
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Joined: Nov 2009
Posts: 3,082 St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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Here's a link to the hybrid pcv/electric evac system I designed, been using it for around 10 years now with no issues. Worth a look if you have a street/strip car like mine... Hybrid PCV/Electric EVAC SystemGrant Not a deal breaker , but that is a man sized amp draw. Just something to be aware of.
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Re: Vac-u-pan effectiveness
[Re: tubtar]
#2747790
02/29/20 04:28 PM
02/29/20 04:28 PM
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Joined: Dec 2005
Posts: 11,621 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,621
Fulton County, PA
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I'm not seeing any electric units capable of moving the volume of air required to do the job, unless you're just trying to make power brakes work. Maybe my search skills are lacking. As per GZ Motorsports: "At best the electric pumps I've tested are about equivalent to a pan-evac system. I'm not current with the latest electric pumps because I abandoned that approach based on our testing. The Pontiac pump which has a lot larger motor than the Corvette pump would run the battery down very quickly if there was no alternator to keep the it charged. Again most of these pumps are designed for low air volume and an oil free environment, they might work adequately for a while, even as well as a similar to a pan-evac system, but they won't likely last a long time." This was a few years ago, but I don't know that anything has changed... Except for this which I know has been used on Pro Stock motorcycles... https://quartermax.com/electric-vacuum-pump-kit/
If the results don't match the theory, change the theory.
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Re: Vac-u-pan effectiveness
[Re: tubtar]
#2747860
02/29/20 08:59 PM
02/29/20 08:59 PM
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Joined: Oct 2014
Posts: 104 Washington
weedburner
member
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member
Joined: Oct 2014
Posts: 104
Washington
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Here's a link to the hybrid pcv/electric evac system I designed, been using it for around 10 years now with no issues. Worth a look if you have a street/strip car like mine... Hybrid PCV/Electric EVAC SystemGrant Not a deal breaker , but that is a man sized amp draw. Just something to be aware of. Did you notice that it only draws power when making a nitrous pass? Although I power the pump from the car's electrical system, it could easily be powered by a cordless tool battery pack. I have also converted one of these pumps to brushless power to get even more rpm/volt, but the pump on my car still has the stock brushed motor. Grant
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Re: Vac-u-pan effectiveness
[Re: CMcAllister]
#2749236
03/05/20 12:16 PM
03/05/20 12:16 PM
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Joined: Jan 2003
Posts: 13,375 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,375
Marion, South Carolina [><]
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I'm not seeing any electric units capable of moving the volume of air required to do the job, unless you're just trying to make power brakes work. Maybe my search skills are lacking. As per GZ Motorsports: "At best the electric pumps I've tested are about equivalent to a pan-evac system. I'm not current with the latest electric pumps because I abandoned that approach based on our testing. The Pontiac pump which has a lot larger motor than the Corvette pump would run the battery down very quickly if there was no alternator to keep the it charged. Again most of these pumps are designed for low air volume and an oil free environment, they might work adequately for a while, even as well as a similar to a pan-evac system, but they won't likely last a long time." This was a few years ago, but I don't know that anything has changed... Except for this which I know has been used on Pro Stock motorcycles... https://quartermax.com/electric-vacuum-pump-kit/ This is what I found out years ago when I was in need of a vacuum pump for my hemi. I bit the bullet and put a belt driven pump on it. Had some issues w/ the Aerospace pump (didn't pull much vacuum and had 2 pumps fail), but once I got a Moroso pump it's been trouble free. GZ & Star also make good pumps.
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: Vac-u-pan effectiveness
[Re: an8sec70cuda]
#2749248
03/05/20 12:55 PM
03/05/20 12:55 PM
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Joined: Dec 2005
Posts: 11,621 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,621
Fulton County, PA
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Star is top shelf. Aerospace I'm not so fond of whether it's brakes, pumps, whatever.
If the results don't match the theory, change the theory.
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