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Old 04-22-2004, 10:32 AM
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bbc water pumps

I should know the answer to the question but I don't. What is the function of the short rubber hose that runs from the top of the water pump to the front of the intake on a BBC? I'm asking because I've seen some race pumps that don't have this port or the heater ports. What would happen if you ran one of these (Weiand I believe) race pumps on a street car?

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Old 04-22-2004, 10:37 AM
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My guess would be that it's there to prevent air locks. Just a guess though.
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Old 04-22-2004, 10:39 AM
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it's a coolant byepass hose.
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Old 04-22-2004, 11:16 AM
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Is there constantly coolant bypassing the block and running to the intake or only when the thermostat is closed? What would happen if a race pump without this port were used on a street engine?
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Old 04-22-2004, 05:30 PM
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yea i was gonna ask the same kind of question.

i don't use a heater core,can i just plug all the water inlet bypasses on intake and water pump?two at top of pump and two on the intake.
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Old 04-22-2004, 09:48 PM
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The reason I posted this question was that I had one of those Weiand pumps on my car and it ran fine for about 15 minutes on the interstate about 65mph then when I would let off the gas it would puke some water out of the water neck. It wasn't even close to overheating...actually running right along at 180F even. It didn't even overheat after it lost the water. I have a big aluminum radiator and I put a new cap on it (18lb I think). It would only puke water after an extended time on the interstate which means I'm turning around 3000rpm. I'm switching back to a pump with the bypass hose to intake soon so I'll let you know if this solves my problem.
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Old 04-23-2004, 08:14 PM
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it sure is hard to find the proper hose anybody got a part number
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Old 04-24-2004, 04:17 AM
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the bypass hose circulates water when the thermostat is closed, if you plug it off and run on the street you will get steam pockets and hot spots in the heads causing detonation and run on.. if you plug off the hose you must also remove the thermostat to keep the water mooving in the engine.
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