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Old 09-15-2012, 04:52 PM   #1
Serkan
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Default Dual pass or Single pass radiator for V mount

I will be tackling custom V-mount project soon. I am at the process of deciding which parts to use.

Setup will be used in a built 2.5L, gt3076r with meth, kelford 264 cams and all other supporting mods.


The reason for V-mount is to gain 300-500 rpm spool (rotated manifold) by reducing the piping.

All the custom work is not a problem. I can weld, cut and fabricate.

Now my question is which radiator would work better for my setup :

A dual pass 31"x16" Northern radiator

or

A single pass 28"x16" Northern radiator


Will a dual pass cause problems in city traffic ?
Or can the water pump handle more flow restrictive dual pass rad ?

Thanks...
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Old 09-16-2012, 06:55 PM   #2
Serkan
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nobody has ideas ?
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Old 09-18-2012, 05:57 PM   #3
shooting
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a buddy of mine is running a dual pass custom rad in his gc8 race car, he just did PPIHC and had no problems keeping it cool, stock water pump moving the coolant, so it does work with suby water pumps. Id almost say the dual pass will HELP in the city for driving. any other thoughts on this anybody?
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Old 09-18-2012, 06:13 PM   #4
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Depends on your power level and the thermal capacity of the core.
There is no cookie cutter way of doing this and to do it the right way you will want to contact the manufacture of the core and ask them for the specs. After that figure out the thermal demand of your motor at the power level you want to hit, and then to keep it at the temperature you want for a given ambient temperature and select accordingly.

This will be a paint, but in a nut shell you need to engineer the system yourself to get the most optimal system for your application. With out doing this, your simply shooting in the dark and hope the core you select can keep up.

Kirill
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Old 09-20-2012, 05:33 PM   #5
reid-o
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Quote:
Originally Posted by RallySport Direct
Depends on your power level and the thermal capacity of the core.
There is no cookie cutter way of doing this and to do it the right way you will want to contact the manufacture of the core and ask them for the specs. After that figure out the thermal demand of your motor at the power level you want to hit, and then to keep it at the temperature you want for a given ambient temperature and select accordingly.

This will be a paint, but in a nut shell you need to engineer the system yourself to get the most optimal system for your application. With out doing this, your simply shooting in the dark and hope the core you select can keep up.

Kirill
RallySportDirect.com
I think he's asking in terms of the coolant flow of the stock water pump in relation to the increased pressure required from a dual pass radiator.
So his question is more about the water pump than the radiator itself.
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Old 09-20-2012, 05:48 PM   #6
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Pressure drop will depend on the density of the core, density and specific gravity of the fluid, the dimensions of the actual heat exchanger, the pipe diameter, along with end tank design.
All this stuff will have effect on pressure drop.
Allot of times when you start going with V mount set ups, guys have to change over to electric water pumps for that reason as the stock pump cant push the volume of flow. But as stated before no easy cookie cutter way to do this other then trial and error or sit down and do math and figure out fluid dynamics and thermodynamic properties of the system.

Kirill
RallySportDirect.com
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Old 09-20-2012, 10:41 PM   #7
Serkan
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Trial and error is the way I am going.

Planning to try the single pass rad and see how the coolant temps during in city driving and track.

Thanks for the info guys.
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Old 09-26-2012, 12:32 AM   #8
reid-o
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Mine is doing fine, but I bought it knowing that it would never see serious track duty since there's no track here in Hawaii any more. Temps are fine in traffic and my motor has 86k on stock water pump.
I do see one problem with going with a smaller dual pass radiator, but it has nothing to do with dual pass. If you go with a smaller radiator in general you limit the fan size and if you place a custom condenser on it you may not get enough flow from the fans to cool the condenser. I'll find out soon but I have my doubts right now.
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