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Cooling/Water capacity per minute ?

Old 08-22-2014, 06:08 AM
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Hotchrome
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Default Cooling/Water capacity per minute ?

A friend works on his '56,265 and he wants to know the cooling ( water) capacity per minute flowing through the system, sure he could try it but if
anybody knows it here?

Thank you
Old 08-22-2014, 08:16 PM
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JohnZ
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Originally Posted by Hotchrome
A friend works on his '56,265 and he wants to know the cooling ( water) capacity per minute flowing through the system, sure he could try it but if
anybody knows it here?

Thank you
The small-block water pump moves 57 gallons per minute at 4000 engine rpm.

Last edited by JohnZ; 08-23-2014 at 04:29 PM. Reason: Typo - changed gallons per hour to gallons per minute
Old 08-22-2014, 09:17 PM
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Originally Posted by JohnZ
The small-block water pump moves 57 gallons per hour at 4000 engine rpm.
Hi John
I'd be interested to know what a 1967 BB water pump moves?
Thank You!
Old 08-22-2014, 10:09 PM
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kingwoodvette
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Originally Posted by JohnZ
The small-block water pump moves 57 gallons per hour at 4000 engine rpm.
That's really surprising. Not even a gallon per minute. Amazing that could keep an engine cool at 4k. Learn something every day when you follow John Z's postings!
Old 08-23-2014, 10:11 AM
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Steve59
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I would think that the physics of heat transfer would require water to move not too fast or not too slow. To fast and it doesn't absorb the heat, too slow, over heats. Probably need the "Goldilocks" speed.
Old 08-23-2014, 11:48 AM
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Originally Posted by JohnZ
The small-block water pump moves 57 gallons per hour at 4000 engine rpm.
Don't you mean gallon /minute?

And, at what head pressure is that rating? The more restriction/back pressure/head, you have in a centrifugal pump, the less it will flow, with enough head, you get no flow at all.

Doug
Old 08-23-2014, 12:59 PM
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Friend and I say thank you for informations !

Best regards,
Hotchrome
Old 08-23-2014, 04:31 PM
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Originally Posted by AZDoug
Don't you mean gallon /minute?

And, at what head pressure is that rating? The more restriction/back pressure/head, you have in a centrifugal pump, the less it will flow, with enough head, you get no flow at all.

Doug
YUP! Gallons per minute - I corrected my original post.

Have no idea what the test head pressure is - the Engineering specs just show GPM, with no other test data.
Old 08-23-2014, 04:32 PM
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Originally Posted by babbah
Hi John
I'd be interested to know what a 1967 BB water pump moves?
Thank You!
The BB water pump moves 82 gallons per minute at 5200 engine rpm.
Old 08-24-2014, 12:36 PM
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Originally Posted by JohnZ
The BB water pump moves 82 gallons per minute at 5200 engine rpm.
Thanks John,
Would it be safe to assume that at 2500rpm that the flow on the BB would be around 40 or so gallons per minute? The flow rate is linear isn't it? Thank You -
Old 08-24-2014, 03:15 PM
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Originally Posted by Steve59
I would think that the physics of heat transfer would require water to move not too fast or not too slow. To fast and it doesn't absorb the heat, too slow, over heats. Probably need the "Goldilocks" speed.
Correct to a point. The formation of nucleate boiling on hot surfaces greatly increases the heat transfer rate of water. Too high of a flow rate reduces nucleate boiling, for example.

Adding a 2000 gal/min water pump (besides having parasitic losses greater than the HP of most of our engineers), would not be a good idea. You want the pump right-sized for best cooling and low parasitic losses, with a little margin for hotter temperature uses.
Old 08-24-2014, 03:31 PM
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Originally Posted by babbah
Thanks John,
Would it be safe to assume that at 2500rpm that the flow on the BB would be around 40 or so gallons per minute? The flow rate is linear isn't it? Thank You -
I don't know - haven't seen the pump output curve.
Old 08-24-2014, 05:21 PM
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Originally Posted by JohnZ
I don't know - haven't seen the pump output curve.
Yup. It's not a steady flow open system.

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