Accusumps, good, bad or unnecessary
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Accusumps, good, bad or unnecessary

  1. #1
    Distinguished Member David 519's Avatar
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    Default Accusumps, good, bad or unnecessary

    I've been told to consider using an accusump in our flat to deal with oil pressure fluctions, especially on shut down. I've never used one, but I've read up on them a bit and can't really see any downside. That said, I don't know if I've really noticed them in a lot of drag boats. Any feedback would be appreciated. Thanks...
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    Senior Member wagspe208's Avatar
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    No downside but cost.
    Buy a good pan with good baffling and the shutdown thing goes away.
    I had a brand x pan. Always had pressure go to 10 or so at shut down. Bought one of Armondo's pieces. Now pressure drops a little, but never goes below 30.
    At shutdown, no load on motor, no big deal. Drag boat guys are generally to scared to look at the pressure gauge anyway. LOL
    It will solve your problem, but also other ways to skin the cat. I think it is better than 0 oil pressure.
    Now, if you are going to use it to prime before fining, there is another discussion.

    David, what do your bearings look like? That should answer part of the question.
    Wags

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    Senior Member Bubbletop409's Avatar
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    DAVID

    I had one on my Lumina, and it solved my problems. I had a Billet Fab directional shoe box pan, and a Titan georotor oil pump. Allways saw a pressure drop in the shutdown area. Pan had excellent baffles and trap doors, but still had problems. Once during a freshen up I was washing the pan with solvent and tilting it back and forth, and noticed the baffles controlled the solvent quite well, I spoke with both Titan and Billet Fab about the issue. They told me the problem was twofold, one the obvious oil moving away from the pickup, the other was oil trapped in the valve covers and valley from the Titan pump volume, further restricted by valley screens and a Jesel drive. They had two suggestions, return lines from the heads or an accumulator. Since the engine was already reinstalled I went the easy way, end of issue.
    Larry

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  6. #4
    Distinguished Member David 519's Avatar
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    Quote Originally Posted by wagspe208 View Post
    No downside but cost.
    Buy a good pan with good baffling and the shutdown thing goes away.
    I had a brand x pan. Always had pressure go to 10 or so at shut down. Bought one of Armondo's pieces. Now pressure drops a little, but never goes below 30.
    At shutdown, no load on motor, no big deal. Drag boat guys are generally to scared to look at the pressure gauge anyway. LOL
    It will solve your problem, but also other ways to skin the cat. I think it is better than 0 oil pressure.
    Now, if you are going to use it to prime before fining, there is another discussion.

    David, what do your bearings look like? That should answer part of the question.
    Wags
    Steve, I was never scared to look at the gauge, just at what I saw. I've tried several wet sump pans over the years and all of them had issues during shut down. None of mine went to 0, but most went to 20 or so.
    When I put this boat together last year, I didn't put an oil pressure gauge where I could see it so I don't know for sure if we've got an issue now. However, both my previous flats had gauges where I could see them and oil pressure dipped on shut down.
    Good point on the bearings though. In the past, never really had bearing issues. With our new blown deal, after 8 pulls on the dyno, bearings look like new and oil pressure was good. However, short pulls, not full quarter mile blasts....


    Quote Originally Posted by Bubbletop409 View Post
    DAVID

    I had one on my Lumina, and it solved my problems. I had a Billet Fab directional shoe box pan, and a Titan georotor oil pump. Allways saw a pressure drop in the shutdown area. Pan had excellent baffles and trap doors, but still had problems. Once during a freshen up I was washing the pan with solvent and tilting it back and forth, and noticed the baffles controlled the solvent quite well, I spoke with both Titan and Billet Fab about the issue. They told me the problem was twofold, one the obvious oil moving away from the pickup, the other was oil trapped in the valve covers and valley from the Titan pump volume, further restricted by valley screens and a Jesel drive. They had two suggestions, return lines from the heads or an accumulator. Since the engine was already reinstalled I went the easy way, end of issue.
    Larry, what you describe is exactly what I'm concerned about; pumping the oil up to the top during a pass and uncovering the pick up during shut down. Though I've gotten away with it in the past, with the new motor, I don't want to take unnecessary chances.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

  7. #5
    steelcomp was here
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    If you don't mind the weight, I see no problelm with one, but like wags said, a good pan should take care of 99% of it. Besides, IMO 20# showing on shutdown with no load on the engine, I wouldn't really worry too much about. How long did it take to recover?
    If God is your co-pilot, change seats!
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    If it's 20 Lbs it is pumping air.

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    steelcomp was here
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    Quote Originally Posted by Fiat48 View Post
    If it's 20 Lbs it is pumping air.
    That's why I asked how long it takes to recover...
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    When it does it......it will seem like a lifetime looking at the gauge. LOL.

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    steelcomp was here
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    Quote Originally Posted by Fiat48 View Post
    When it does it......it will seem like a lifetime looking at the gauge. LOL.
    PLeeez...pleeez...c'mon....c'mon...ahhhhh....whew!
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  12. #10
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    I guess my home made pan works as go as any other pan. Only problem I have is some seepage.

    Tim

  13. #11
    gn7
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    Bet if you made WOT dead engine shore starts you would have one See qoute below



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