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Old 04-03-2015, 08:36 AM   #1
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What are people's thoughts on a cold air intake. Is it worth it ? Waste of time?
Forced air, not? As everyone knows even a half a mile a gal improvement would be huge. Did it on my K5 got two
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Old 04-03-2015, 11:40 AM   #2
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Please explain what you mean by, "cold air intake." Most diesel pushers have the intake drawing from outside air, above the height of rear wheels to limit amount of dust sucked in to the air filter. Pushing more air in will result in needing more fuel to properly mix with the increased air. As long as the intake is as direct and unrestricted as possible I doubt if you'll gain much mpg.
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Old 04-03-2015, 06:43 PM   #3
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On my old 8.1 workhorse chassis pace arrow (2002), I just replaced the stock filter with an AFE PG7 (yellow) reusable filter. It already has a horn style intake behind the grille. Which is gonna be as "cold" as the air gets. Besides, u gotta drive 90mph to force any air in that thing anyway. I did notice some improvement climbing hills and save the $$ and replace the stock mufflers to a free flow design. The 8.1 already has a true dual exhaust so you're good there. If u have a V-10, well.....disregard everything I said. 😬.


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Old 04-03-2015, 06:51 PM   #4
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Quote:
Originally Posted by diesel1204 View Post
What are people's thoughts on a cold air intake. Is it worth it ? Waste of time?
Forced air, not? As everyone knows even a half a mile a gal improvement would be huge. Did it on my K5 got two
Complete waste of time!

If you want economy, you should try a HOT air intake, as it will reduce air density and hence pumping losses at part throttle.

Secondly you'll never get fast enough to generate any useful amount of static air pressure via Ram Air Effect.

If you want to do something useful by making ducting though, it's very useful to make sure air entering the front of the motorhome actually goes THROUGH the

Radiator
Power steering and brake cooler
transmission cooler

instead of AROUND them, as happens after pretty much every RV manufacturer is finished building a front cap.

Your engine will cool better, you may never hear your fan clutch kick in, and your transmission will certainly run cooler
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Old 04-03-2015, 07:04 PM   #5
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While warm air intakes do help a bit at lower RPM, at high RPM, like a V-10 Ford will lose power with a warm air intake. The theory is warm air is less dense, and contains less oxygen, so the ECU opens the throttle further to compensate. The air flows with less restriction, thus a bit more MPG. I'm not a real fan of the concept, in diesels you strive for cooler intake air, thus the almost universal use of inner coolers to reduce intake temperatures after the turbo has compressed it.
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