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Ran my Blown gas 509 today to get check for leaks ect. The maganflow pump wouldnt keep it cool, Ended up using the water pump on the superflow dyno and it worked fine. Is this normal?, In an earlier ? I got the understanding that all we needed to do was plumb it into the tower on the dyno which we did to, I am using the 3/4 inch pump per Bob @ glenwood, I have a 1 inch pump as well. Thanks for any info, Tom
 

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You can't or at least probably shouldn't use a magnaflow with a tower. I never have. The tower is built to mimick a radiator. It returns warm, sometimes very warm water to the engine as opposed to 100% loss from a garden hose. The magnaflow just can't move enough water thru the block too cool it if the water is is much over 100*. When was the last time you boated in a lake over 100* Also, when your under that much load, your force feeding the magnaflow, and it will move more water at a higher pressure when the boat is moving. The pump adds little pressure to the inlet pressure. Its the nature of a pump. Its what they do.
Surprised that Bob recommended the 3/4 over the 1 inch for a blown 509. Makes you wonder when he recommends a 1". They were building 1" pumps long before 500" motors were common place. Make you wonder why they thought they ever needed on back then if the 3/4 will handle a blown 509. You may not have any problem with the 3/4, just surprise he suggested it.



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steelcomp was here
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We ran Nelson's all day with no trouble. Not saying anything one way or the other, just sayin...
 

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Discussion Starter #4
You can't or at least probably shouldn't use a magnaflow with a tower. I never have. The tower is built to mimick a radiator. It returns warm, sometimes very warm water to the engine as opposed to 100% loss from a garden hose. The magnaflow just can't move enough water thru the block too cool it if the water is is much over 100*. When was the last time you boated in a lake over 100* Also, when your under that much load, your force feeding the magnaflow, and it will move more water at a higher pressure when the boat is moving. The pump adds little pressure to the inlet pressure. Its the nature of a pump. Its what they do.
Surprised that Bob recommended the 3/4 over the 1 inch for a blown 509. Makes you wonder when he recommends a 1". They were building 1" pumps long before 500" motors were common place. Make you wonder why they thought they ever needed on back then if the 3/4 will handle a blown 509. You may not have any problem with the 3/4, just surprise he suggested it.
I called Bob to settle some plumbing questions, Too many opinions and conflicting info, He told me that the 1 inch pump was designed for motors with logs vs wet headers that dont have but a bit of water volume going out of them and that I might get the motor to hold a bit of temp vs hardly any by using the smaller pump. Being new to this it seems nothing get much temp in it. I agree the Magnaflow pump did not move near as much water as the pump on the Dyno as evidenced by the amount of water I got when I loosened varoius fitting to get the air out of the system. Once we used the Dyno pump things were normal according to my dyno guy. Still wondering how Steel and Nelson got way with it? Motor was at 2 to 3 grand under a bit of a load and the temp kept climbing, The motor is nothing special. We would cool it off and go again until we changed pumps. Your point about inlet temp of water and pressure at the inlet obvoiusly changes thing a bunch. I just want to make sure I dont have a problem lurcking around that will show up at the lake. Thanks Tom
 

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steelcomp was here
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I called Bob to settle some plumbing questions, Too many opinions and conflicting info, He told me that the 1 inch pump was designed for motors with logs vs wet headers that dont have but a bit of water volume going out of them and that I might get the motor to hold a bit of temp vs hardly any by using the smaller pump. Being new to this it seems nothing get much temp in it. I agree the Magnaflow pump did not move near as much water as the pump on the Dyno as evidenced by the amount of water I got when I loosened varoius fitting to get the air out of the system. Once we used the Dyno pump things were normal according to my dyno guy. Still wondering how Steel and Nelson got way with it? Motor was at 2 to 3 grand under a bit of a load and the temp kept climbing, The motor is nothing special. We would cool it off and go again until we changed pumps. Your point about inlet temp of water and pressure at the inlet obvoiusly changes thing a bunch. I just want to make sure I dont have a problem lurcking around that will show up at the lake. Thanks Tom
I'm pretty sure the water tower we were using had circulating water to keep the temp in check, and was not just a tank.
 

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I'm pretty sure the water tower we were using had circulating water to keep the temp in check, and was not just a tank.
He called it a tower and most dyno towers have either waste water replaced by new tap water or water circulating to some sort of radiator. The tower can act like a thrermostat controlled by the amount of either fresh or circulated radiator water introducted to the tower. They are great for stable water temperture control. But if the water in them gets to much warmer than lake water, the enigne will run warm. The Magnaflow just doesn't move that much water. If it did, you would have to restrict the hell out it just to get the engine to temp on the water.
Are you sure you had a 3/4 and not a 1" Magnaflow? Its not determined by the pipe thread size on the pump. They are both 3/4 inlet.

It all comes down to how cool the tower was running. I wouldn't give it a second thought till you have it on the water.

TOMSS1, I agree the 1" pump was made very popular by the turbo ski boats with wet exhaust, and we ran the 3/4 magnaflow and the 3/4 Neovane for years with no issues. Big HP with wet exhaust was the reason for the 1" PUMP.



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