Vacuum Pump Location
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Vacuum Pump Location

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    Senior Member Ahsumtoy's Avatar
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    Default Vacuum Pump Location

    It seems that most vacuum pumps are mounted on the front of the cylinder head. I am going to drive my vacuum pump of the Lenco driveshaft at the rear of the engine. Yes the pump is setup for reverse rotation. Does it matter how high the pump is mounted? What if I made a bracket coming of a motor rail to mount the pump to, would that cause a problem with the function of the pump?

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    Senior Member Red Rocket's Avatar
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    I have seen them mounted high on the head and low on the motor plate it shouldn't matter.

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    Quote Originally Posted by Ahsumtoy View Post
    It seems that most vacuum pumps are mounted on the front of the cylinder head. I am going to drive my vacuum pump of the Lenco driveshaft at the rear of the engine. Yes the pump is setup for reverse rotation. Does it matter how high the pump is mounted? What if I made a bracket coming of a motor rail to mount the pump to, would that cause a problem with the function of the pump?
    My only thought would be the closer to the valve cover (or wherever you're pulling the vcuum from)the better, but other than that it shouldn't matter. Just make sure there's no movement beween the drive and the pump or your belt won't be happy.
    ETA: The only other thought I had about this is during hard acceleration there may ba more of an accumulation of oil towards the rear of the engine, and the pump might ingest more oil than if it were pulling from the front. Not even saying that it makes much difference, just a thought.
    Last edited by scott foxwell; 09-10-2009 at 05:02 PM.
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    Senior Member Ahsumtoy's Avatar
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    Quote Originally Posted by steelcomp View Post
    The only other thought I had about this is during hard acceleration there may ba more of an accumulation of oil towards the rear of the engine, and the pump might ingest more oil than if it were pulling from the front.
    Any idea what position on the valvecover would be best, given its toward the rear of the engine. For example, top of cover similar to a breather, or rear of cover but as high as possible? How much of the cover is actually filled with oil at WOT?

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    steelcomp was here
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    Quote Originally Posted by Ahsumtoy View Post
    Any idea what position on the valvecover would be best, given its toward the rear of the engine. For example, top of cover similar to a breather, or rear of cover but as high as possible? How much of the cover is actually filled with oil at WOT?
    Probably as high as possible...maybe on the side, toward the intake, or high on the top. I wouldn't put it on the rear of the cover, and definitely not down low. If you can make some kind of baffle it would probably help some.
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    I'm going to be using a CFE sheetmetal intake and a Jesel front drive distributer, so that opens up the intake area where a distributer normally is. What if I picked up off the floor of the intake?

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    Quote Originally Posted by Ahsumtoy View Post
    I'm going to be using a CFE sheetmetal intake and a Jesel front drive distributer, so that opens up the intake area where a distributer normally is. What if I picked up off the floor of the intake?
    You'll still have to run some kind of disrtributor stub shaft, but off the floor of the intake should work. There's still a lof of oil flying around inside off the tops of the lifters so again, a baffle might be a good idea.
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    Senior Member Ahsumtoy's Avatar
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    Quote Originally Posted by steelcomp View Post
    You'll still have to run some kind of disrtributor stub shaft, but off the floor of the intake should work.
    Yeah, a distributor plug to drive the oil pump. I was thinking in that area, not in the exact spot. I have a Star Machine vacuum pump and their baffel, but maybe an additional baffel in the opposite direction over the Star one. That would force the oil to travel in an "S" shape direction. Thanks for the help. Steve

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    If your running an electric fuel pump, get it from the fuel pump mounting boss.



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    Heres my baffle and fitting. Do you think it will work under the floor of my intake manifold and prevent oil from getting to the pump?

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    man... i need a mill

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    Quote Originally Posted by Ahsumtoy View Post
    Heres my baffle and fitting. Do you think it will work under the floor of my intake manifold and prevent oil from getting to the pump?

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    i run a an fitting such as your's in the lower area of my intake floor but it has a tube aprox 4 inches long with a 45 degree cut on the end, the intake is 1'' pipe threads and the an fitting was drilled and 4340 moly tube was press into the fitting and then simply screwed into the floor of the intake near the dist on my bbc. if you need a pic i can e-mail you one.

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    Senior Member Ahsumtoy's Avatar
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    Quote Originally Posted by havasubyou View Post
    i run a an fitting such as your's in the lower area of my intake floor but it has a tube aprox 4 inches long with a 45 degree cut on the end, the intake is 1'' pipe threads and the an fitting was drilled and 4340 moly tube was press into the fitting and then simply screwed into the floor of the intake near the dist on my bbc. if you need a pic i can e-mail you one.
    Yes, I would appreciate it if you could send me a picture. You can email it to me at [email protected] or you could post it here. Question, do you have much oil being picked up with your setup?

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    Quote Originally Posted by Ahsumtoy View Post
    Yes, I would appreciate it if you could send me a picture. You can email it to me at [email protected] or you could post it here. Question, do you have much oil being picked up with your setup?

    here is a couple of pics of the pickup and of location of intake where it is screwed in, yes i pulled the dizzy just for you,

    this was orig made as a pickup for the dry sump with a closed off intake galley,but it worked better as a pcv port on my wet sump, very dry in hose.




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