vacuum pump on a blown engine
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vacuum pump on a blown engine

  1. #1
    COLE TR-4 BGF MEANSTREAK's Avatar
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    Default vacuum pump on a blown engine

    Any negatives about running a vacuum pump on a blown engine.

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    Senior Member SHAWN DAVIS's Avatar
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    Just a little extra weight, plumbing and a extra belt

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    gn7
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    Quote Originally Posted by SHAWN DAVIS View Post
    Just a little extra weight, plumbing and a extra belt
    Yeah, but his wallet will be lighter



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    Without a boat hondoboat's Avatar
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    He already has the parts. Is there any real drawbacks or for that matter benefits?

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    Ring control maybe.

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    gn7
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    Quote Originally Posted by twoblade View Post
    Ring control maybe.
    thats a negative of using a vacuum pump?



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    Don't know in a blown deal, a friend of mine runs a promod in IHRA, big inch motor, says it alowes them to run real low tension rings, less drag, more power. Pump helps control oil ring? But the parts they run are crazy.

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    Senior Member EVILFORCE's Avatar
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    If it is a drag deal at not at max effort just run exhaust scavenging set up. Vac pump is a bit better. Maybe 20-25 hp or more. Now beat me boys. I have not been spanked in awhile.

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    My friend told me on their motor it is worth 4hp max. But this thing is totally maxium effort!

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    Senior Member SHAWN DAVIS's Avatar
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    Had a friend run on on a pro mod blown wedge, no dyno results to back anything up though.

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    gn7
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    I thought the OP was asking about negatives on a blown deal. Silly me.



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    So short answer, no. Extra costs and more hardware are only downside. Better GN?

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    Quote Originally Posted by gn7 View Post
    I thought the OP was asking about negatives on a blown deal. Silly me.
    are there blower motor specific vacuum pumps to keep up with the extra blowby volume, or do you just over drive or under drive them to the demand of the engine and set your relief valve to desired vacuum?

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    gn7
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    Quote Originally Posted by bowtiebro View Post
    are there blower motor specific vacuum pumps to keep up with the extra blowby volume, or do you just over drive or under drive them to the demand of the engine and set your relief valve to desired vacuum?
    there are larger ones, but you don't need a Pro Mod mondo pump. The drive ratio is variable to a point, but you can only spin them so fast 1/2 crank speed is pretty common.
    Your ability to build a well sealed engine is the most important thing. They aren't a band aid for a leaker.



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