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Old 02-06-2020, 04:49 PM   #1
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90 Cummins intercooler question

I recently bought a Cummins 5.9 engine out of Ď90 bus for backup/parts for my same year dodge pickup. Iím debating on using the air to water intercooler off the bus motor to intercool my truck. Just wondering if there are any tips for doing it, any risks, whether itís worth it or not, basically any suggestions or info would be greatly appreciated.
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Old 02-07-2020, 12:50 AM   #2
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I have never fooled with an air to water intercooler.

I have to wonder what the temperature of the air coming out of the turbo that you can cool it with 180F coolant?

That said, the cooler the air the more dense it is and the more power you can make.
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Old 02-07-2020, 11:51 AM   #3
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I have never fooled with an air to water intercooler.

I have to wonder what the temperature of the air coming out of the turbo that you can cool it with 180F coolant?

That said, the cooler the air the more dense it is and the more power you can make.
I havenít either, and have only seen this particular kind on this bus and tractors. Main reasons for wanting to do it this way is that it looked a lot easier than cutting holes and fabbing the front of my truck to accept an air to air intercooler. But after talking to a local mechanic last night he said something along the lines of what you did about the temperature of the coolant. I guess Iíll put on my big boy pants and just do it the right way and possibly do some water meth with it as well. Thank you for responding!
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Old 02-07-2020, 01:28 PM   #4
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Try looking at Av-Tekk on line, I have one of their catalogues and they have plenty of options for air to air inter-coolers. I had to buy one of their inter-coolers for my conversion so I got the largest that would fit my bus since it's hot rod now.
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Old 02-07-2020, 01:40 PM   #5
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Originally Posted by PNW_Steve View Post
I have never fooled with an air to water intercooler.

I have to wonder what the temperature of the air coming out of the turbo that you can cool it with 180F coolant?

That said, the cooler the air the more dense it is and the more power you can make.
They actually work pretty well.

Most systems I've seen were self contained and have their own pump/radiator.

The few that did draw from the engine radiator worked good, as long as your coolant temp isn't ran ragged. Typically, the water at the bottom of the radiator is substantially cooler then that at the thermostat outlet.

And with water having way more heat carrying capacity then air, they work better then most air to air intercoolers, and have a smaller footprint.

Running without an intercooler, you can see inlet air temps close to 300-400 degrees F depending on how much boost psi you're running.

If you plan on making any power at all turbocharged, an intercooler is almost a must. Having your air filter draw from outside air is also a big help.
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Old 02-07-2020, 01:41 PM   #6
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Originally Posted by Codyb1992 View Post
I recently bought a Cummins 5.9 engine out of Ď90 bus for backup/parts for my same year dodge pickup. Iím debating on using the air to water intercooler off the bus motor to intercool my truck. Just wondering if there are any tips for doing it, any risks, whether itís worth it or not, basically any suggestions or info would be greatly appreciated.
Do you have any pictures of this system? I'd like to see them for curiosity's sake.
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