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5 replies

Water Pump Output to Cooling Tube Diameter Transition.....

rockyrockyMember
The output of my Stewart Stage 1 Water Pump (and I think, the stock Ford water pump) is 2".

The "expanded neck" on the matching cooling tube is only 1 13/16" - at least on my Stainless Steel tube set.

A piece of Gates Green Stripe that fits the waterpump outlet sure has a big gap where it would join the SS tube.

What do people do?

Just crank it down on the smaller end with dual hose clamps (that's what my PO did - it seemed to work)....

I think I could get a smooth copper reducer from a plumbing supply store to ease the transition... That's more hose clamps, but a pretty minor issue...

Suggestions?

Rocky
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jfb05177jfb05177Member
I think that would be the water pump inlet.

having worked with pumps in other applications, the flow transition into the inlet has a large effect on the pumps performance. You want the velocity to slow down and not be turbulent to reduce suction induced cavitation.

the elbow transition piece for 5177 looks like it was cobbled up at a muffler shop. However it does have a flow straighting vane inside.

If you could streach a straight section of 1 5/8" over the transition and then streach the 2" section over that (doubling up)

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J jb1490Member
Chuck,

The stock Ford water pump inlet is 1.75", and the stainless tube should also be 1.75" (measured on the tube, not the bead).

Try immersing the end of a piece of 1.75" straight radiator hose in boiling water for a few minutes. Remove and immediately force the hose onto the water pump inlet and let cool (may take a couple of tries).

I know that this works for stretching 1/8", but I have not tried stretching the hose 1/4".

John
rockyrockyMember
Guys - Thanks.

JFB - I didn't get this was a hose coupler at first - I thought it was a "hose diameter reducer" that you put inside the body of the hose. Why a person would do that was a mystery to me. It is clear now. Thanks.

Silly me.

To close this one out, I just went and bought the next size smaller hose (the size that fit the SS pipe). I was (easily) able to stratch this over the cast waterpump inlet by soaking it in hot water for a minute.

Thanks again for the advice.

Rocky

Thanks -
Last edited by rocky

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