creating vacuum
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creating vacuum

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    Senior Member skippers WFOT's Avatar
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    Default creating vacuum

    id like to create more vacuum in my engine....does anyone think a vacuum pump from a diesel pickup engine would do the job? i only ask because a racing pump is so expensive?
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

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    Pro Gas Jet RedPearl's Avatar
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    Default Smog pump

    I know a guy that builds serious power with junk yard parts. He would turn old smog pumps into vacuum pumps. Its definitely an option. we put a vacuum gauge on the motor with a check valve on it so you can see what ur max vacuum was on a pass. works great.
    Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!

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    "Need For Speed" Gearhead's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    id like to create more vacuum in my engine....does anyone think a vacuum pump from a diesel pickup engine would do the job? i only ask because a racing pump is so expensive?
    You may want to check a salvage yard for a "smog" pump. Prior ot Moroso and others manufacturing race vacuum pumps, racers were using "smog" pumps. The first vaccum pump I used on my Competition Eliminator engine back in the early '90's was a smog pump from a Ford pickup.

    Gear

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    Senior Member skippers WFOT's Avatar
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    i have a niebor with a wrecked 88 f250 and the vac pmp was already sitink on the fender so it made me think and it would be free. woud a smog pump be better than a vacuum pump?
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    i have a niebor with a wrecked 88 f250 and the vac pmp was already sitink on the fender so it made me think and it would be free. woud a smog pump be better than a vacuum pump?
    Does your engine have excessive blow-by? Is it a fresh build ....and why do you want more vacuum? what rpm range do you run it?

    S CP

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    I had seen some of the late 90's cars (GM, I think) had an electric smog pump. Pretty serious duty cycle and could probably be had pretty cheap. No belt and no bracket

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    almost every 5.0 mustang 87-93 runs a smog pump...

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    Member hollbrow's Avatar
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    Default Vacuum pump

    There exists a certain Delco smog pump that is a heavy duty belt driven unit and actually has about a 3/4" hose barb on it for connections- years ago, a guy I knew was experimenting with them as blow thru superchargers for Go Kart engines. He was getting them from salvage yards. Seems I recall that there was a forum post on the web about go kart supercharging that listed a part number for the desirable pump. I know also that my 94 Camaro HAD a smaller electric smog pump on it- a couple of those- one on each side- may do the job, however they will probably pull quite a few amps if you really get them doing some work.

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    Senior Member Widetrack's Avatar
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    Late model Corvettes offer an electric pump that is set 6-7 lbs works well and cheap too!


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    Senior Member H20MOFO's Avatar
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    A couple quick related questions. Are there any drawbacks...seems like a while back over on the dyno they were discusing how it could create oiling issues. I could be way off but seems like they were talking about starving the wrist pins. Secondly....don't you need special rings to take advantage of the vacuum?....or would any motor benefit?
    Another Hot Boat refugee

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    Senior Member skippers WFOT's Avatar
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    on my first build last yr i was getting alot of blowby in the rocker covers. tore that engine apart and am assymbling a different one. i just want to head off the problems before they are problems. I run 3-5k last yr. hope to get more revs this yr. I had read that with the big cam and tunnel ram there are vacuum issues......
    1977 Charger 17Foot. jacuzzi golden eagle
    402 BBC tunnel ram with dual 660 fuel leaks on the top.

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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by skippers WFOT View Post
    on my first build last yr i was getting alot of blowby in the rocker covers. tore that engine apart and am assymbling a different one. i just want to head off the problems before they are problems. I run 3-5k last yr. hope to get more revs this yr. I had read that with the big cam and tunnel ram there are vacuum issues......

    this is why it's a good idea to ask a few questions before offering up advice.

    FYI, on your engine these are seperate issues, but I'll let someone smarter than me answer them.

    S CP
    Last edited by Sleeper CP; 07-27-2011 at 11:28 AM.

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    Default vacuum pump

    Go Ebay. and look for aerospace components vacuum pump. They sell refurbished pumps for about half $ of new one.
    Last edited by Desperado; 09-01-2013 at 09:37 PM.
    armandshammer

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    Senior Member SoldHondaBoughtHondo's Avatar
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    To answer what i think the op was really asking...Tunnel ram/big cam=less vacuum. Are you having issues with the power brakes? lol

    Vacuum pumps on a diesel is to generate vacuum for accessories and power assist brakes.

    Aftermarket vacum pumps/smog pumps are used to generate negative pressure in the crankcase to reduce friction.

    Yours is just a tune issue, poor idle quality, crappy throttle response from low rpm. Mine makes 4-5" @ idle in gear.

    Blowby in the rockers is a function of how well the rings seal, all motors do it.
    Normal blowby is addressed with a proper crankcase ventilation system.
    Last edited by SoldHondaBoughtHondo; 09-01-2013 at 11:34 PM.
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