Vacuum source
Thread Starter
Race Director
Joined: Feb 2002
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From: Compound in the Grove, Ga.
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St. Jude Donor '16
Vacuum source
Restoring a 72 and have the motor and interior out. Need to rework the complete vacuum system. Looking for ideas or suggestions on what to use as a temporary vacuum source, something that will allow me to operate wiper door head lights and AC systems.
Thanks
Thanks
Team Owner
Joined: Jun 2000
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From: Southbound
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Burning Brakes
Joined: May 2017
Posts: 774
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From: Seattle WA
I have this one: https://www.summitracing.com/parts/sum-760152
Last edited by scottjamison; Apr 27, 2020 at 03:46 PM.
Thread Starter
Race Director
Joined: Feb 2002
Posts: 11,599
Likes: 1,053
From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
2025 C4 of the Year Winner - Unmodified
2024 C4 of the Year Finalist - Unmodified
2020 C3 of the Year Finalist - Unmodified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
St. Jude Donor '16
Thanks Mike, I do have one of them, just did not think it would pull and hold the volume needed for the tank and to also open the lights and wiper door. I'll give it a shot.
aquaroscoe, did not think about using my shop vac, guess with a bit of backyard engineering I could size the line down
As to the summit pump bit to many $..
I had also thought about using the vacuum pump off my ZR-1.
Burning Brakes
Joined: May 2017
Posts: 774
Likes: 375
From: Seattle WA
Thanks Mike, I do have one of them, just did not think it would pull and hold the volume needed for the tank and to also open the lights and wiper door. I'll give it a shot.
aquaroscoe, did not think about using my shop vac, guess with a bit of backyard engineering I could size the line down
As to the summit pump bit to many $..
I had also thought about using the vacuum pump off my ZR-1.
aquaroscoe, did not think about using my shop vac, guess with a bit of backyard engineering I could size the line down
As to the summit pump bit to many $..
I had also thought about using the vacuum pump off my ZR-1.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,170
From: Hermosa
If you have a compressor of decent volume this would work. It’s what I used to use to vacuum down ac systems.
https://www.harborfreight.com/air-va...ors-96677.html
https://www.harborfreight.com/air-va...ors-96677.html
Thread Starter
Race Director
Joined: Feb 2002
Posts: 11,599
Likes: 1,053
From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
2025 C4 of the Year Winner - Unmodified
2024 C4 of the Year Finalist - Unmodified
2020 C3 of the Year Finalist - Unmodified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
St. Jude Donor '16
OK so how much vacuum do I need to pull continuously to operate them I would guess the supply tank will only be good for one open or close?
Last edited by FASTAZU; Apr 27, 2020 at 06:27 PM.
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Melting Slicks
Joined: May 2015
Posts: 2,365
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From: Cape Girardeau Missouri
Be very wary of using low volume, high vacuum vacuum pumps used for A/C. They draw down vacuum far greater than the engine and can damage components. A vacuum cleaner is a more suitable source (high volume, low vacuum) but getting a decent seal for the connection will be difficult 
It takes a few minutes but the trusty Mitee Vac drew down the system in my '79 with its FAR larger vacuum reservoir (it's a 6" or so diameter cylinder nearly the width of the car that doubles as a front framing member).
It takes a few minutes but the trusty Mitee Vac drew down the system in my '79 with its FAR larger vacuum reservoir (it's a 6" or so diameter cylinder nearly the width of the car that doubles as a front framing member).
Drifting
Joined: Jul 2006
Posts: 1,259
Likes: 154
From: Deplorableville Nebraska
Perfect solution for your needs is in the following threads from long ago;
https://www.corvetteforum.com/forums...cuum-pump.html
https://www.corvetteforum.com/forums...-corvette.html
Medical aspirators are made for this task. Will power up the entire vacuum system if needed, and gentle enough to check individual components plumbed right. Lots of them on that auction site and in surplus out there.
https://www.corvetteforum.com/forums...cuum-pump.html
https://www.corvetteforum.com/forums...-corvette.html
Medical aspirators are made for this task. Will power up the entire vacuum system if needed, and gentle enough to check individual components plumbed right. Lots of them on that auction site and in surplus out there.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,170
From: Hermosa
You know any vacuum pump that can develop at least 8" to 10" of vacuum would be sufficient. If you use a pump with greater than 18" to 20" of vacuum then just put in a calibrated leak (drill a very small hole in the vacuum supply hose) to drop it to an acceptable level. Use a "T" with a vacuum gauge to see how much vacuum your pulling and adjust the "leak" accordingly to get your desired vacuum.
I not sure a vacuum cleaner can pull the kind of vacuum needed. I don't know for sure because I haven't measured it, but it's more of a volume machine vs a vacuum machine.
I not sure a vacuum cleaner can pull the kind of vacuum needed. I don't know for sure because I haven't measured it, but it's more of a volume machine vs a vacuum machine.