Forced Induction Superchargers | Turbochargers | Intercoolers

Flow direction of heat exchanger?

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Old Aug 24, 2022 | 04:18 PM
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Question Flow direction of heat exchanger?

I'm going to be using this Mishimoto dual pass heat exchanger for my supercharger and it has both the hose fittings on one side, top and bottom... Which direction would I route the coolant? Hot coolant going in at top and out the bottom or opposite? This setup has a 5 gallon trunk tank and high flow pump as well...



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Old Aug 24, 2022 | 04:47 PM
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Usually top to bottom but I don’t think it matters
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Old Aug 26, 2022 | 06:58 PM
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Water coming in needs to go into the lower port.

If you use the top for the inlet you can get air pockets inside.
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Old Aug 26, 2022 | 07:09 PM
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I get what y'all are saying about low speed boost, but I wonder how much of it is old wives tale. Like you used to hear "If your gonna boost, you have to go low compression."

No, you don't.

Here are the towing capacity specs for a F150

EcoBoost® Engine Maximum Towing Capacity;
2.7L Turbocharged EcoBoost® 9,000 lbs
3.5L EcoBoost® 13,200 lbs
High Output 3.5L EcoBoost® 11,100 lbs.

All turbocharged. All 4 tons or more towing capacity.

Last edited by SteveJewels; Aug 26, 2022 at 07:19 PM.
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Old Aug 27, 2022 | 02:07 PM
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Originally Posted by SteveJewels
I get what y'all are saying about low speed boost, but I wonder how much of it is old wives tale. Like you used to hear "If your gonna boost, you have to go low compression."

No, you don't.

Here are the towing capacity specs for a F150

EcoBoost® Engine Maximum Towing Capacity;
2.7L Turbocharged EcoBoost® 9,000 lbs
3.5L EcoBoost® 13,200 lbs
High Output 3.5L EcoBoost® 11,100 lbs.

All turbocharged. All 4 tons or more towing capacity.
Say wat lol
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Old Aug 27, 2022 | 02:09 PM
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Originally Posted by SteveJewels
Water coming in needs to go into the lower port.

If you use the top for the inlet you can get air pockets inside.
Hmmm... look at what Mishimoto said :

Hello Mo,

Thanks for the email.

Typically in cooling systems the feed hose/line (hot) should be installed on the upper portion of the cooler. The return hose/line (cold) is typically on the bottom portion.

Try this application out and see if this works for your build. Let me know if there is anything else I can do for you.

Thank you,


Nicholas Armstrong

Mishimoto Automotive
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Old Aug 28, 2022 | 03:26 AM
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You MIGHT ,, get away with it with coolant, OIL/Trans fluid, hydraulics,, all recommend in the bottom,, out the top, I trust farm equipment manufacturers on this one..
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Old Aug 28, 2022 | 03:33 AM
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Originally Posted by SteveJewels
I get what y'all are saying about low speed boost, but I wonder how much of it is old wives tale. Like you used to hear "If your gonna boost, you have to go low compression."

No, you don't.

Here are the towing capacity specs for a F150

EcoBoost® Engine Maximum Towing Capacity;
2.7L Turbocharged EcoBoost® 9,000 lbs
3.5L EcoBoost® 13,200 lbs
High Output 3.5L EcoBoost® 11,100 lbs.

All turbocharged. All 4 tons or more towing capacity.
and yet dealers even in the current market cant hardly get rid of used ford trucks with those engines,
Trans issues, turbo issues, valves burnt, carbon buildup... Have 3 friends that USED to own them.
Local mountain pass that sees a ton of boat traffic, small turbos dragging 6 to 10k lb
boats end up dead on the downhill side of the 6000 foot pass a lot.

Plus just may take,, the 3.5 pulling any load gets about 12 MPG, Yukon I drove to Alabama from Oregon last year got 22 - 24 at 80 MPH..
Rented the 3.5 to go Oregon to North Dakota you could pass anything but a gas station. All I had in it was my daughters apartment stuff for college, IIRC it was about a 900 lb load total.





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Old Aug 28, 2022 | 11:52 AM
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Originally Posted by pdxmotorhead
You MIGHT ,, get away with it with coolant, OIL/Trans fluid, hydraulics,, all recommend in the bottom,, out the top, I trust farm equipment manufacturers on this one..
PDX, yeah I think I'm gonna go with what you guys said, in the bottom and out the top The pump should not have a problem anyway, it's a Davies Craig EWP150 🙂
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Old Aug 29, 2022 | 06:29 AM
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^^ Ya, that sounds like a plan, given the mfgr said the opposite.
This is nothing more than a pressurized water cooler.
When was the last time you saw an engine rad plumbed with hot water in at the bottom?
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Old Sep 1, 2022 | 06:23 PM
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Originally Posted by Old Buzzard
^^ Ya, that sounds like a plan, given the mfgr said the opposite.
This is nothing more than a pressurized water cooler.
When was the last time you saw an engine rad plumbed with hot water in at the bottom?
You mean an engine radiator with a fill neck on top where the air can be let out?
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Old Sep 1, 2022 | 06:49 PM
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Originally Posted by SteveJewels
You mean an engine radiator with a fill neck on top where the air can be let out?
Lol Ummm ok so since the Heat Exchanger does not have a cap or any kind of vent valve, does this change things??
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Old Sep 4, 2022 | 06:33 PM
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Originally Posted by momofx
Lol Ummm ok so since the Heat Exchanger does not have a cap or any kind of vent valve, does this change things??
Yes, a radiator with a fill neck on top has a place to let air out.

Here are instructions for a B&M transmission cooler. The outlet is up or at the top so air can get out of the cooler.


Last edited by SteveJewels; Sep 8, 2022 at 04:49 AM.
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Old Sep 17, 2022 | 10:34 AM
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Look at how a stock rad works… hot always on top and cool on the bottom. Cool water naturally wants to fall to the bottom and heat will naturally rise and try to warm the upper section.
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Old Oct 17, 2022 | 04:36 PM
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Ok guys I'm getting ready to put the cooling system together. The pic shows how my blower lid aka cooling bricks are routed for cooling. So the hot coming out (red) would go to the bottom of the heat exchanger? I'm guessing the top of the heat exchanger would go to the tank and then the tank outlet goes to the cooling bricks inlet (blue)?


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