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Old 02-03-2015, 07:53 PM   #1
Pekenoe's Avatar
National RV Owners Club
Join Date: Jun 2013
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High rear drivers corner air intake

Curious if anyone else has doubts of the effectiveness of that location for engine air intake? Looking at it and visualizing air flow down the side of the rv having the intake opening on the corner curved surface it appears to me there is the possibility of a semi vacuum there rather than any kind of free flow.

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Old 02-03-2015, 08:31 PM   #2
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Location: Cincinnati
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Do you have an air filter gauge? It shows how much air restriction or 'drag' on the intake. A diesel engine is just a big air pump, pulling air in, compressing it, and blowing it out the exhaust. I'd think the engine/chassis designers knew what they were doing. If you design your own 'scoop' or other modification, be careful you're not pulling in too much water in rain or creating new issues. You can dramatically decrease any air flow restrictions by removing the filter and also the muffler. I mean what's a little dust in the turbo???


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 02-03-2015, 09:01 PM   #3
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Location: Western WA
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That's exactly where mine is. Almost 70,000 miles driving all over this great country in all kinds of weather and absolutely no complaints about insufficient air flow or crud being sucked into the air inlet and ruining the air filter.
'07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X
Blue Ox, Aventa
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Old 02-03-2015, 09:12 PM   #4
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On our DSDP there is a lot of intake restriction. A new filter goes to 15 immediately on a hard pull. We have a Banks kit on it and the filter and tubing should feed an ISL with no trouble so not sure why the high reading. Boost pressure did go from 24-25 to 34-35 but that shouldn't be enough to cause a problem.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey
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Old 02-04-2015, 11:24 AM   #5
"Formerly Diplomat Don"
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Location: Moorpark, Ca.
Posts: 7,216
They place them there to pull in cool, clean, and hopefully water free air. I did make some minor changes to my previous coach. When looking into the opening, they had shoved the pipe too high up into the opening where it almost touched the roof of the opening. I sawed some of the pipe off so that there was just about 1" of excess pipe in the opening. (On a lot of coaches, the height of the pipe in the opening is just where the line employee shoved and glued it in.)

I felt my change allowed the pipe to more easily pull air through the opening.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
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