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Vacuum pumps

  1. #43
    gn7
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    It's definitely a cubic inch thing. Also gear type pumps don't pull the kind of depression a gerotor or lobe type (ROOTS) do. If you can get the numbers without the vac pump, then running one is sensless. But when you look at the C.I. of some of those Pro Mods and the use of a gear type pump I can see why they may need to run both. There no doubt that the Roots type (verdi) pump can pull way deeper than any other dry sump pump out there.



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  3. #44
    Senior Member Red Rocket's Avatar
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    Quote Originally Posted by Warp Speed View Post
    Not sure why you would need to use a vacuum pump in a dry sump to achieve a high (over 18in) level of depression if the system is set up properly??
    I see allot of Pro-Mod cars with them on, and even asked a fast local pro-mod guy what kind of depression they were seeing, he said about 14in??? Not sure if they need a better pump, work on the seals and/or ring seal or it is just the nature of large displacment engines!?! I have never messed with a dry sump big block (let alone BIG one) so I'm not sure.
    I do know an Autoverdi on a properly sealed small block can pull almost an atmosphere, but that is at a VERY low blow-by state (rings, seals ect..).

    Still learnin' this big engine stuff....but DAMN is it fun!!!!!
    I run a vac pump on my dry sump motor in my drag boat, because the oil pump will not pull down the vaccum in a short period of time. Drag cars get to do a burn out back up stage the car and can rev up the motor before staging to pump down the engine.A drag boat gets about 45 seconds from start up to green lite and if you're in jet boat you can't run up the rpm to pump it down. My system is a 5 stage peterson with a Moroso 3 vane no regulater, leaves the starting line at 14 inches and pulls down to 20 by 1/8 mile and holds.

  4. #45
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    Quote Originally Posted by Red Rocket View Post
    I run a vac pump on my dry sump motor in my drag boat, because the oil pump will not pull down the vaccum in a short period of time. Drag cars get to do a burn out back up stage the car and can rev up the motor before staging to pump down the engine.A drag boat gets about 45 seconds from start up to green lite and if you're in jet boat you can't run up the rpm to pump it down. My system is a 5 stage peterson with a Moroso 3 vane no regulater, leaves the starting line at 14 inches and pulls down to 20 by 1/8 mile and holds.
    That's another thing I didn't think about is the short run time. I would bet with some seal work and a verdi pump you could probably loose the vacuum pump even with the short run time. Our engines run (idling at 3200rpm) about 25 seconds before reaching within 4-5in of max depression. That is with pretty small stages (stupid rules!) but a fairly small "crankcase area" also.

    Hopefully I can find out in the future as I would like to go UBFJ racing at some point, but it damn sure aint going to be in the next week or two!$!$!

    What are most running for front/rear main and cam seals??

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  6. #46
    Senior Member Red Rocket's Avatar
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    Yes, the Auto verdi pumps will do it by themselves but they are very expensive and I just couldn't throw down almost triple what my peterson cost me, so I had the vac pump from when I ran a wet sump system and went that route. I am running seals from peterson which are supposed to hold better vac. on both front, rear,and cam.

  7. #47
    Senior Member bp298's Avatar
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    Quote Originally Posted by Warp Speed View Post
    Well, really there is no such thing as vacuum, but an absence of pressure (atmospheric or otherwise). This is called depression or an "atmospheric depression". More commonly (but in the engineering field wrongly) refered to as "vacuum". Therefore, it is actualy inches of depression we are measuring.
    It is about like calling an engine a motor. It is an improper, but accepted statement.

    Hell, that's what I've been told anyway. Tomato-Tomato...you get the point!

    Warp Speed
    "More commonly (but in the engineering field wrongly) refered to as "vacuum"".. engineering field wrongly??? that is hilarious...
    pressure at less than atmospheric is defined as a vacuum, has been called a vacuum for hundreds of years, and defined in texts as such for at least the past 150 years.
    an atmospheric depression is a naturally occuring reduction in atmospheric pressure. it is not "less than" atmospheric pressure, it is atmospheric pressure at the point of reference. if you have some other text reference that supports your view, please provide it.

  8. #48
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    Quote Originally Posted by bp298 View Post
    "More commonly (but in the engineering field wrongly) refered to as "vacuum"".. engineering field wrongly??? that is hilarious...
    pressure at less than atmospheric is defined as a vacuum, has been called a vacuum for hundreds of years, and defined in texts as such for at least the past 150 years.
    an atmospheric depression is a naturally occuring reduction in atmospheric pressure. it is not "less than" atmospheric pressure, it is atmospheric pressure at the point of reference. if you have some other text reference that supports your view, please provide it.
    Damn BP, didn't meen to piss in your corn flakes!

    I guess you told me huh???


  9. #49
    B1 Racing cs19's Avatar
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    I cant download the autoverdi catalog. Did anyone see a vacuum pump for a wet sump engine. NOT DRY SUMP. thanks.
    B1Racing.net

  10. #50
    Senior Member rivertime247's Avatar
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    Default autoverdi

    nice looking pumps!


  11. #51
    B1 Racing cs19's Avatar
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    Still dont see a vacuum pump, those are oil pumps.

    You guys should step up and run an electric vacuum pump.

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  12. #52
    Senior Member Red Rocket's Avatar
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    Are you thinking about changing pumps, not happy with the Moroso?

  13. #53
    Senior Member rivertime247's Avatar
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    Default catalog

    Quote Originally Posted by cs19 View Post
    I cant download the autoverdi catalog. Did anyone see a vacuum pump for a wet sump engine. NOT DRY SUMP. thanks.

    where do you find there catalog...i didnt find it on there site ?

  14. #54
    Senior Member rivertime247's Avatar
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    Default dry sump vac

    Quote Originally Posted by Red Rocket View Post
    Yes, the Auto verdi pumps will do it by themselves but they are very expensive and I just couldn't throw down almost triple what my peterson cost me, so I had the vac pump from when I ran a wet sump system and went that route. I am running seals from peterson which are supposed to hold better vac. on both front, rear,and cam.

    hey mike,
    i know this may sound stupid but this new moroso with anodized clear finish looks nice but is called out for dry sump application......can it be used on wet sump.




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  15. #55
    steelcomp was here
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    Quote Originally Posted by bp298 View Post
    "More commonly (but in the engineering field wrongly) refered to as "vacuum"".. engineering field wrongly??? that is hilarious...
    pressure at less than atmospheric is defined as a vacuum, has been called a vacuum for hundreds of years, and defined in texts as such for at least the past 150 years.
    an atmospheric depression is a naturally occuring reduction in atmospheric pressure. it is not "less than" atmospheric pressure, it is atmospheric pressure at the point of reference. if you have some other text reference that supports your view, please provide it.
    Jeez louise...
    So what's your take on vacuum pumps bp?
    If God is your co-pilot, change seats!
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  16. #56
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    Quote Originally Posted by cs19 View Post
    Still dont see a vacuum pump, those are oil pumps.

    You guys should step up and run an electric vacuum pump.

    I'll have to look those up. Once I push the back seat back 3" this Winter I don't think there will be room in front for one, it will either be put one on the back or that ...hummmmm

    Sleeper CP

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