vacum pumps
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vacum pumps

  1. #1
    Senior Member tx-19's Avatar
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    Default vacum pumps

    will it only pull vacum at full rpms?when i start it ,it stays at 0 when i rev it up a little it moves and bounces a little.is it better to take the line off the valve cover when warming up the motor?

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    Glendale Arizona Squirtcha?'s Avatar
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    Have you seen this thead Joey? I read all of it tonight. There's some good info and at least one of your questions is answered.

    Vacuum pumps

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    Senior Member cyclone's Avatar
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    Quote Originally Posted by tx-19 View Post
    will it only pull vacum at full rpms?when i start it ,it stays at 0 when i rev it up a little it moves and bounces a little.is it better to take the line off the valve cover when warming up the motor?
    should pull vacuum at idle

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  6. #4
    B1 Racing cs19's Avatar
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    With everything set up right you should see a few inches at idle. You might have a leak or the pump speed is too low??? I used to have my data logger hooked up to the engine reading vac. I was pulling about 12 inches at the end of a run back then but it didnt go straight to 12 it takes a little while to pump down to 12. I think I saw 3-4 at idle.
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    Senior Member tx-19's Avatar
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    how long does it take at at idle to see vacum?i started it ,but it was only for about 10 seconds.

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    Senior Member cyclone's Avatar
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    Quote Originally Posted by tx-19 View Post
    how long does it take at at idle to see vacum?i started it ,but it was only for about 10 seconds.
    i was thinking about this. if your engine isn't sealed up good and tight (oil pan and valve cover gaskets especially) that might be a reason for it not pulling vacuum. Did you say you blew the dipstick out last time we were at the river? might be your leak right there.

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    Senior Member Hustler's Avatar
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    Quote Originally Posted by cyclone View Post
    i was thinking about this. if your engine isn't sealed up good and tight (oil pan and valve cover gaskets especially) that might be a reason for it not pulling vacuum. Did you say you blew the dipstick out last time we were at the river? might be your leak right there.

    If the pumps not working properly do you think that would of caused the dip stick to push out?

  10. #8
    Senior Member Josh@JBP's Avatar
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    Quote Originally Posted by Hustler View Post
    If the pumps not working properly do you think that would of caused the dip stick to push out?
    Posibbly. If the pump is not creating a vacuum and the engine is sealed up well then some crank case psi could develop and push the dipstick out.

  11. #9
    mo balls than $cents$ IMPATIENT 1's Avatar
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    slip a longstyle plug boot over the dipstick to seal it off
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  12. #10
    Senior Member Futs's Avatar
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    Just a thought here, it could be plumbed with the lines backwards. it would then push into the engine.

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    Senior Member tx-19's Avatar
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    Quote Originally Posted by Futs View Post
    Just a thought here, it could be plumbed with the lines backwards. it would then push into the engine.
    its plumbed just like yours.

  14. #12
    Senior Member tx-19's Avatar
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    Quote Originally Posted by cyclone View Post
    i was thinking about this. if your engine isn't sealed up good and tight (oil pan and valve cover gaskets especially) that might be a reason for it not pulling vacuum. Did you say you blew the dipstick out last time we were at the river? might be your leak right there.
    the dip stick is pretty tight.when i started it,i had the relieve valve adjusted almost all the way out.

  15. #13
    Senior Member Futs's Avatar
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    Quote Originally Posted by tx-19 View Post
    its plumbed just like yours.
    Gotcha. Why are you starting it up with the releif valve open? Just letting the oil warm up before it starts to draw? I warm mine with the belt off if it's sat for a long time, but then it should be good to go. Where are you reading your vacuum from? The opposite valve cover?
    Last edited by Futs; 06-19-2008 at 05:58 PM.

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    B1 Racing cs19's Avatar
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