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Re: Vac-u-pan effectiveness [Re: Wirenut] #2747494
02/28/20 07:07 PM
02/28/20 07:07 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Originally Posted by Wirenut
Originally Posted by 69dart
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
wave

Re: Vac-u-pan effectiveness [Re: MR_P_BODY] #2747523
02/28/20 08:17 PM
02/28/20 08:17 PM
Joined: Oct 2007
Posts: 4,205
New York
polyspheric Offline
master
polyspheric  Offline
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Joined: Oct 2007
Posts: 4,205
New York
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
Re: Vac-u-pan effectiveness [Re: polyspheric] #2747527
02/28/20 08:35 PM
02/28/20 08:35 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Posts: 52,972
Romeo MI
I bought a unit designed for a engine... should pull 8" to 10" on a SB
wave

Re: Vac-u-pan effectiveness [Re: MR_P_BODY] #2747552
02/28/20 09:24 PM
02/28/20 09:24 PM
Joined: May 2016
Posts: 629
Ct
W
Wirenut Offline
mopar
Wirenut  Offline
mopar
W

Joined: May 2016
Posts: 629
Ct
I use methanol and am looking for ways to evacuate moisture. I have seen guys connect a shop vac in the pits after a run. I thought employing an Electric pump on the return road and at the trailer after a pass could help.

Re: Vac-u-pan effectiveness [Re: Wirenut] #2747611
02/29/20 01:06 AM
02/29/20 01:06 AM
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
tex013 Offline
top fuel
tex013  Offline
top fuel

Joined: Mar 2009
Posts: 2,457
Sydney,Australia
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
Re: Vac-u-pan effectiveness [Re: tex013] #2747614
02/29/20 01:14 AM
02/29/20 01:14 AM
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
tex013 Offline
top fuel
tex013  Offline
top fuel

Joined: Mar 2009
Posts: 2,457
Sydney,Australia
Try this

Tex

20190710_093320.jpg20190710_093404.jpg

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
Re: Vac-u-pan effectiveness [Re: tex013] #2747699
02/29/20 11:28 AM
02/29/20 11:28 AM
Joined: May 2016
Posts: 629
Ct
W
Wirenut Offline
mopar
Wirenut  Offline
mopar
W

Joined: May 2016
Posts: 629
Ct
Originally Posted by tex013
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

Re: Vac-u-pan effectiveness [Re: Wirenut] #2747765
02/29/20 03:20 PM
02/29/20 03:20 PM
Joined: Oct 2014
Posts: 103
Washington
W
weedburner Offline
member
weedburner  Offline
member
W

Joined: Oct 2014
Posts: 103
Washington
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 System

Grant

Re: Vac-u-pan effectiveness [Re: weedburner] #2747769
02/29/20 03:34 PM
02/29/20 03:34 PM
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar Offline
master
tubtar  Offline
master

Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
Originally Posted by weedburner
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 System

Grant


Not a deal breaker , but that is a man sized amp draw.
Just something to be aware of.

Re: Vac-u-pan effectiveness [Re: tubtar] #2747790
02/29/20 04:28 PM
02/29/20 04:28 PM
Joined: Dec 2005
Posts: 11,408
Fulton County, PA
C
CMcAllister Offline
Mr. Helpful
CMcAllister  Offline
Mr. Helpful
C

Joined: Dec 2005
Posts: 11,408
Fulton County, PA
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.
Re: Vac-u-pan effectiveness [Re: tubtar] #2747860
02/29/20 08:59 PM
02/29/20 08:59 PM
Joined: Oct 2014
Posts: 103
Washington
W
weedburner Offline
member
weedburner  Offline
member
W

Joined: Oct 2014
Posts: 103
Washington
Originally Posted by tubtar
Originally Posted by weedburner
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 System

Grant


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

Re: Vac-u-pan effectiveness [Re: madscientist] #2749105
03/04/20 11:16 PM
03/04/20 11:16 PM
Joined: Jan 2003
Posts: 1,412
Johnstown
69dart Offline
pro stock
69dart  Offline
pro stock

Joined: Jan 2003
Posts: 1,412
Johnstown
No mufflers. Possibly too many whoomps at the finish line on occasion though. 🤷‍♂️


33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage
Re: Vac-u-pan effectiveness [Re: CMcAllister] #2749236
03/05/20 12:16 PM
03/05/20 12:16 PM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Offline
I Live Here
an8sec70cuda  Offline
I Live Here

Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
Originally Posted by CMcAllister
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
Re: Vac-u-pan effectiveness [Re: an8sec70cuda] #2749248
03/05/20 12:55 PM
03/05/20 12:55 PM
Joined: Dec 2005
Posts: 11,408
Fulton County, PA
C
CMcAllister Offline
Mr. Helpful
CMcAllister  Offline
Mr. Helpful
C

Joined: Dec 2005
Posts: 11,408
Fulton County, PA
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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