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Using AN lines for radiator hoses

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Old Mar 30, 2018 | 11:23 AM
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Default Using AN lines for radiator hoses

I have a Meziere "race" water pump, it is the heavy duty version and I plan on using it for road racing and some street use. I purchased -16 AN hose adapters from Meziere to make my own radiator hoses and not use the rubber factory lines. Will -16 lines be too small for cooling an LS motor? Is anyone else running -16 lines? I believe factory lines would be equal to -20 AN but this Meziere pump should flow much higher rates, website says 42GPM ive read mixed reviews on a factory LS1 water pump but what ive read its about 25GPM

Any help wold be greatly appreciated, I think I can get -20 fittings from Meziere if needed.




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Old Mar 31, 2018 | 07:10 AM
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Anyone have any suggestions?
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Old Mar 31, 2018 | 05:35 PM
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Use a belt driven pump if you're road racing. The electric deal won't keep up at high sustained rpm.
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Old Mar 31, 2018 | 07:28 PM
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Originally Posted by DietCoke
Use a belt driven pump if you're road racing. The electric deal won't keep up at high sustained rpm.
Meziere seemed to think otherwise when I called them
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Old Mar 31, 2018 | 10:04 PM
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Originally Posted by Buryingthesun


Meziere seemed to think otherwise when I called them
What would you expect them to say?? They sell electric pumps..... and ONLY electric pumps.....
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Old Mar 31, 2018 | 11:22 PM
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Originally Posted by Buryingthesun


Meziere seemed to think otherwise when I called them
Meziere is also in the business of selling product. I actually road race LS engines. Who you going to believe? Your money

P.S. a stock pump at 6500 rpm flows ~120GPM.
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Old Apr 1, 2018 | 07:11 AM
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Originally Posted by DietCoke
Meziere is also in the business of selling product. I actually road race LS engines. Who you going to believe? Your money

P.S. a stock pump at 6500 rpm flows ~120GPM.
I would have run a factory water pump if I were not running a distributor front cover. This thread is not about what pump is best or how truck coils are better than my distributor set up, its about what radiator hoses size will work.
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Old Apr 1, 2018 | 07:12 AM
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I dont think your pump is going to keep up, and either way, the radiator lines arent going to make a difference because thats nowhere close to the smallest point in the system.
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Old Apr 1, 2018 | 07:33 AM
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Originally Posted by DietCoke
I dont think your pump is going to keep up, and either way, the radiator lines arent going to make a difference because thats nowhere close to the smallest point in the system.
Thank you for your input, I honestly appreciate it.
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Old Apr 3, 2018 | 05:21 PM
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-16 ( ~ 1") should have no trouble flowing that little fluid.

Like others have said however, that's probably not the right question to be asking. 25 gpm is a bit less than a half-gallon per second... not a wholehelluvalot.
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Old Jan 12, 2022 | 11:03 PM
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Take a look at a sprint car ,,, they seem to get a lot of cooling done with 4 small hoses.. Their water pump setup is different too.
THey can handle 10K rpm for an hour.... at least.. Lots of nifty bots to be stolen from the dirt side...
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Old Jan 22, 2022 | 04:04 AM
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Originally Posted by pdxmotorhead
Take a look at a sprint car ,,, they seem to get a lot of cooling done with 4 small hoses.. Their water pump setup is different too.
THey can handle 10K rpm for an hour.... at least.. Lots of nifty bots to be stolen from the dirt side...
I'm guessing methanol possibly?

I've never seen a sprint car run for an hour......ever...
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Old Jan 22, 2022 | 11:10 AM
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Originally Posted by LilJayV10
I'm guessing methanol possibly?

I've never seen a sprint car run for an hour......ever...
I don't think a sprinter carries enough fuel for an hour's running.
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Old Jan 24, 2022 | 07:22 AM
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We run -16 radiator lines on our drag-street car with a 55gpm electric pump. The reason for the -16 lines is the same as old school, putting a 3/4" holed washer in line to slow the water down so it has a little longer chance to cool in the radiator. A 55gpm pump will not be the problem. Getting the right sized radiator/fan combo, to handle the heat produced is what is needed. No different than mechanical.
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