Magnaflow h20 pump too much h20! Help please!
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Magnaflow h20 pump too much h20! Help please!

  1. #1
    Senior Member usual suspect's Avatar
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    Default Magnaflow h20 pump too much h20! Help please!

    I run a magnaflow /glenwood cam driven water pump and the engine runs fairly cold. Does anyone have experience in limiting the flow on one of those pumps? I made orifice inserts for the discharge side of the pump to limit the flow to the engine, but it doesn't slow the pump volume down enough and water has a slow weep from pump, therefore i dont want to go smaller orifice insert. The engine never gets to a good temp and its a PGF 499 ci motor in a hondo runner drag boat. Does anyone have experience with this? I also heard about cutting every other vane on the impeller....has anyone done this with success.? I don't even run a pump on my kboat I just force feed water from the cave plate pickup, but I want to be able to warm the boat on the trailer at the launch ramp and also idle the boat without burning the heads up, and I am not looking to run a closed system like I have seen on other PGF's.
    Any help is appreciated. Thanks

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    Quote Originally Posted by usual suspect View Post
    I run a magnaflow /glenwood cam driven water pump and the engine runs fairly cold. Does anyone have experience in limiting the flow on one of those pumps? I made orifice inserts for the discharge side of the pump to limit the flow to the engine, but it doesn't slow the pump volume down enough and water has a slow weep from pump, therefore i dont want to go smaller orifice insert. The engine never gets to a good temp and its a PGF 499 ci motor in a hondo runner drag boat. Does anyone have experience with this? I also heard about cutting every other vane on the impeller....has anyone done this with success.? I don't even run a pump on my kboat I just force feed water from the cave plate pickup, but I want to be able to warm the boat on the trailer at the launch ramp and also idle the boat without burning the heads up, and I am not looking to run a closed system like I have seen on other PGF's.
    Any help is appreciated. Thanks
    Two questions.

    Magnaflow makes two size pumps, one is a 1 5/8" housing and the other is a 2" housing.
    If you have the 2" housing, the smaller one does pump less water.

    I had heard cutting every other blade would reduce the water flow also. I talked to Gleenwood who makes the Magniflow and he said that is not correct, it would make it flow more water.

    I had the same problem you are talking about on water volume and had the 2" pump.
    They will sell you the smaller housing by itself and you will also need to change to the smaller impeller, but everything else can be used.
    It's a lot cheaper than buying a new pump, if you have the larger pump.

    With that being said, dragboat motors are going to run cold. Mine will go to about 140* with 80* lake water.

    I used a -6 restriction in mine to reduce water flow and it seems to work OK. If your pump weeps, have you tried changing the O-rings and used new ones?
    It also might make a difference on how small your restrictions are, if they are already smaller than -6, I don't have any experience there.
    Good luck.

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    When this was discussed before someone mentioned that restricting the outlet would just let the rubber vanes in the pump fold over and the flow would be reduced but sufficient pressure would be maintained.
    That made sense to me. Maybe try putting a gate valve on the outlet line. Restrict the flow and monitor the block water pressure at different rpm.

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    Quote Originally Posted by Unchained View Post
    When this was discussed before someone mentioned that restricting the outlet would just let the rubber vanes in the pump fold over and the flow would be reduced but sufficient pressure would be maintained.
    That made sense to me. Maybe try putting a gate valve on the outlet line. Restrict the flow and monitor the block water pressure at different rpm.
    That would work, but since the magna flow has dual outlets it would be needed on both sides.
    I'm not a fan of gate valves because they can be accidentally turned and the volume would change. Sometimes it may be the simplest or most logical for some applications.
    There certainly is a greater degree of control with the gate valve.

    I hard lined mine from the pump to the block with -8 stainless and to restrict the water more, I slightly flared a -6 and slipped it inside the -8.

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    I have 2 different size pickup tube for mine. I is about 1/2 id and the other is close to 5/8...summer/winter deal.With same lake
    temp there is about 20* difference in engine temp. Pickup to makes warm up easy, i stick garden hose to the tube with a hose clamp. fill the motor and run a jumper hose from the pickup to the water dump.
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    Or run the thermostat from Rex

    Thermostat Kits & Divider Outlets

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    Default Thanks for the help

    Thanks to all who chimed in on this. After calling Glenwood and Bergeron based on your imput, there are some non conventional ways to accomplish this, such as limiting the water to the pump( not sure how long the pump will last because it cavitates the pump, and potentially creates air /steam pockets in the aluminum heads) and slowing the water flow on the outlet side of engine ( pressure buildup may get past gaskets and seals). I decided to go the safe route...to Go from the 1" pump housing at 60 gallons per minute flow to another smaller housing ....the 3/4" housing at 30 gpm. I can still use the same pump and shaft, but need to change the housing and impeller. I hope this will take care of it. At least I know I won't be risking starving the motor or pump or heads of water going this route. I appreciate all the help.
    Thanks!

  10. #8
    gn7
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    The 3/4 might be the trick for you.
    Never ever restrict a magnflow.
    Just keep in might, pressure is you friend, and you could never hope to create more pressure with a magnaflow than your street car produces with the A/C on in Havasu summer day. I have corked them shut dead, and never put a drop water in the engine.



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