vacume pump

[gearhead]

I have been thinking about running a vac pump set up on my new motor on my 87 GN. I have a electric vac pump off of a LT1 Camaro that I want to try and use. I am hoping that this will stop some of the nagging oil leaks. I plan to kick it on with a hobbs switch ,so it just kicks on under boost.
Have any of you guys done this? Thanks for your input....Frank

[EightSecV6]

I have been thinking about running a vac pump set up on my new motor on my 87 GN. I have a electric vac pump off of a LT1 Camaro that I want to try and use. I am hoping that this will stop some of the nagging oil leaks. I plan to kick it on with a hobbs switch ,so it just kicks on under boost.
Have any of you guys done this? Thanks for your input....Frank


The "secret" is out........

[ekool]

Billy,

For those of us not in the know, hook us up with the knowledge.

Be like Bobby Gallman and let the common man in on the fun.

[Dwayne]

I use a vac. pump from an early 90's GM car. I pull vac from the right side valve cover. I also have a check valve on each valve cover so that when I go to boost I will have a completely sealed motor so the pump is more efficient, kinda hard to explain in words, but I'll try to post some pics this afternoon after work. I also use a hobbs switch that is triggered at 2lbs of boost. There are some tricks that you can do to the pump itself to make it better, like taking out the internal check valve, and takin' the foam out of the pump so it doesn't get oil soaked. I have no oil leaks after doing this (2 years ago).........good luck

[Scott Atk]

I remember reading somewhere that the LT1 air pumps dont last long when pulling vacuum. Any success stories out there?

[TType85]

i've got two of the LT1 pumps sitting on my workbench off low mile cars. I'm going to try and hook one up soon.

[Kansas T]

I remember reading somewhere that the LT1 air pumps dont last long when pulling vacuum. Any success stories out there?

I melted one in less than 30 minute of normal driving. The internals cant take the heat from running all the time. I added a hobbs switch so it only comes on under boost and I havent had any more problems.

[EightSecV6]

On a TIGHT sealed engine, you can pull about 2" of vacuum using the LT1 or LS1 pump. You will onlt have a -10 fitting in one valve cover and the other is not drilled at all. The oil leak thing is sort of a bonus. The pump will aid in sealing the rings as well as creating a negative pressure in the crankcase allowing the piston to be assisted as it travels down on the power stroke. It will sort of act like a poor mans dry sump without the benifit of reduced windage. We run them on the street regularly and have a dropout tank for oil before the pump. It can easily be mounted (hidden!!) in the front left inner fenderwell, behind the bumper. I have never had one fail, maybe it is far enough away from the source???? 2" of vacuum will probably get you 15-20hp. I dont run them on a Hobbs switch as it usually takes 2-5 seconds to build the vacuum up. The only down side is you will have generally 3-5# lower oil pressure at idle (who cares). Thats it, no more explanations..... :frech:

[ekool]

Damn, now I see why you wanted to hold onto the secret. Thats a good nugget of information complete with HP/TQ figures.

Thx Bill, you da man!

[2 Stroke]

Billy,

For those of us not in the know, hook us up with the knowledge.

Be like Bobby Gallman and let the common man in on the fun.

hey yall.....b-o-double-b-y g at the keyboard......bobbys been a way for a while.....see bobby had some problems with "the man" and bobbys smoke smoke harvest..........bobby had to go away for a while.....make some new friends......but see new friends had homosexual ways which is against what bobby stands for.......what bobbys sayin.....it bobby had to raise up and let bobbys new friends that there homosexual ways were wrong........even if locked up with only fellas.......but see it was all good for bobby g for the dpgc.....bobby had "congical visit"........yea good times for bobby and congical visiter....even brought bobby a little smoke smoke to keep bobbys mind right........bobby made new friendZ like bobby does....learned HTML while bobby had some time....talked with bobbys people......started new website.....www.milfhunter.com see bobby is not the milf hunter though......bobby is fella holding the camera.....who sounds like hes been heavy on the smoke smoke....that would be me.....the one and only bobby g.......

yall asked for knowledge on vacuum pumps......bobbys bout to drop knowledge.....ill give yall a minute to grab a pen.........



see its like this....the lt1 vacuum pump is a toy.......like the penis pump......i see metco is making them now too....check it www.metco.com see bobby has a leaf blower in the fendor of his gn........pulls a good 24" of hg on the motor....thats right.....bobby maximizing HP for the common man....but see problem is it will suck all oil through the pump in about 20 seconds.....which is why bobby developed the 7 stage bobby g oil baffle system.....started as a icehouse can....bobby got busy and put his skillZ on the icehouse can....now the 7 stage bobby g oil control system......soon to be available to the common man from bobby g......

hope that helps.......

[Chuck]

Bill sez:
"2" of vacuum will probably get you 15-20hp.
It's known that you don't like to share "SSS", but do you think, as a bit of "Christmas charity", you could let us in on a peek at some dyno info on this "free HP"???

BTW, this :applaus: replaces your :frech:

Happy Holidayz!! :cool:

[GRNDNL]

Bill, With only 2" of vacuum do you still need to flip the seals?

[Quickt]

Bill, With only 2" of vacuum do you still need to flip the seals?

That was going top be my question to. Is there a vacuum pump out there that will pull more than 2" of vacuum. I hear 8"-10" is where you need to be.

[Chuck]

Lonnie, here's the info I have on the subject.

Common values by application: [Gathered from some well known engine builders, and published by Stef's Oil pans.]

Pro stock type engines: 20 - 23in.
Comp elim type engines: 17-19in.
Stock elim type engines: 8-12in.

I'd guess your expectations are not far off, if the above is anywhere close to "reality". :D

A "well known" pro guy here around Atlanta, told me he uses his vac readings to determine the necessity to freshen up the engine... vac drops a particular amt, and the power falls along with it. He said he can tell immediately if the car will slow down. Sounds good to me!!! :arco:

[EightSecV6]

Bill, With only 2" of vacuum do you still need to flip the seals?


No, you will be fine as it is. For anyone running it only part of the time, that would lead to a major mess! Without a dry sump or an external pump, I would think the Buick will really struggle with oil pressure if you ran much more than 8-10"

[GRNDNL]

No, you will be fine as it is. For anyone running it only part of the time, that would lead to a major mess! Without a dry sump or an external pump, I would think the Buick will really struggle with oil pressure if you ran much more than 8-10"


My thinking was to pull through the factory breather on the right side, seal up the PCV and left cover for racing, then put the breathers and PCV back on for the street, disconecting the Vacuum pump. Your not having any problems running the pumps all the time?

Thanks, Keith

[Scott Atk]

Does the Bobby "G" seven stage oil control system only come in ICEHOUSE or can you get it in BUD?? Thanks for the help :joint:

[six shooter]

How much cfm is required to pull 5-7 in. vacuum ( quickly ) in a well sealed Buick engine ?

[EightSecV6]

My thinking was to pull through the factory breather on the right side, seal up the PCV and left cover for racing, then put the breathers and PCV back on for the street, disconecting the Vacuum pump. Your not having any problems running the pumps all the time?

Thanks, Keith

You could do that, probably would work well.As far as the 5-7", I dont know what cfm would be required but I doubt you could get it done with even 2 pumps. I have not had any failures running them on the street, never used one in anything that saw more than weekend driving. We put 2 on a SBC with a Vortech SC and it pull 4.5" at 14 volts.

[Scott Atk]

I don't think you would have any problem pulling 5-10" with a "real" vacuum pump. The LT1 pump is actually an air pump that people are running backwards... I think ???