Charge Air Cooler - Diesel Forum -
6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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post #1 of 3 (permalink) Old 05-17-2010, 07:33 PM Thread Starter
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Charge Air Cooler

In other threads the relationship between air density and air temp have been discussed. The colder the air the densor the air, thus more oxygen to burn more fuel producing more power. In the past the CAC resided out front with no way to control the cooling substance(air). This caused the temp of intake air(cooled substance) to vary widely as it was dependant on ambient air temp. In eastern Montana this could be from approximatly -50 to 115 deg. Intake air had to be monitored so the computer could adjust fuel input over a wide range of temps.

The 6.7 CAC uses controled temp coolant as the cooling substance. This temp is approximatly 113 deg. Intake air temp should now vary much less making it easier for emissions control. I have not decided if this is a better,worse or neutral setup for other reasons. Anybody else?

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post #2 of 3 (permalink) Old 05-17-2010, 08:02 PM
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Probably just fine. Anytime you compress air, regardless of ambient temp, it is going to get hot. So at the very least you want to bring it back down as close to ambient as possible.

In some cases, like turbine engines, higher inlet temps improve combustion...
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post #3 of 3 (permalink) Old 05-18-2010, 06:04 PM
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Funny you should mention this. I have a friend on another forum that monitored manifold air temps and did some mileage testing. He found his best results were at around 110 degrees F.

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