Water Pump Danger.

McRat

McRat

Diesel Hotrodder
Aug 2, 2006
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If you are building a race engine, there is a potentially dangerous problem with our waterpumps. The gear is pressed on the shaft, and on Casper's engine it started to come off and was slipping.

Not sure how often it happens, but I'm hearing I'm not the first. Cheap insurance is to throw a TIG bead around the snout, being careful not to heat soak the entire assy and wrecking the bearing.
 
duramax3388

duramax3388

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couldn't you just use a electric pump that goes on the coolant line to the radiator or from the radiator to the motor or do both if one isn't enough. just a thought
 
McRat

McRat

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There is another issue.

Our waterpump is fairly modern design. At least as good as the aftermarket.

So let's say you need 10HP worth of water pumping done. With an electric, you first convert rotational energy into electric power, then take the electrical power and turn it into rotational energy. You will use perhaps 12HP minimum to get 10HP with electric, assuming a 90% efficiency each time you change energy forms.
 
Josh2002cc

Josh2002cc

That Uncle
Apr 2, 2007
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Oh, I have only seen them on comp use only "race" engines. Didn't know you were talking about a engine that was driven daily on the street. I apologize
 
McRat

McRat

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Josh2002cc said:
Oh, I have only seen them on comp use only "race" engines. Didn't know you were talking about a engine that was driven daily on the street. I apologize
Click to expand...

Not even necessarily daily. You don't even need water in your block for drag racing. And if you keep the HP down, an electric water pump will work in a street car. It might not overheat at 1/2 throttle, but it will certainly get hot if you try to sustain WOT. I'd be surprised if our trucks didn't overheat at 70mph on the freeway with an electric, since they take about 50% more HP than a car to go 70mph.

If you want to keep the pedal down more than 12 seconds, you'll need a "big" waterpump. Now they could make "big" electric pumps, but they weight more and use more HP than the equilivent mechanical pump.
 
dmaxvaz

dmaxvaz

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Nov 22, 2006
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McRat said:
There is another issue.

Our waterpump is fairly modern design. At least as good as the aftermarket.

So let's say you need 10HP worth of water pumping done. With an electric, you first convert rotational energy into electric power, then take the electrical power and turn it into rotational energy. You will use perhaps 12HP minimum to get 10HP with electric, assuming a 90% efficiency each time you change energy forms.
Click to expand...

WHAT IF WE HAVE A gear drive reduction for the electric water pump? kind of like a starter; spin faster with less power consumption
 
Josh2002cc

Josh2002cc

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Apr 2, 2007
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I didn't think about the weight issue, had sled pulling on my mind when I posted this.
 
LBZ

LBZ

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dmaxvaz said:
WHAT IF WE HAVE A gear drive reduction for the electric water pump? kind of like a starter; spin faster with less power consumption
Click to expand...

That would work I think. Good idea. As long as the water pressure wasn't too high I can't see a problem with this.

Hardest thing about this I think would be getting someone to build it.
 
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