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Old 04-20-2015, 05:33 AM   #1
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Join Date: Jun 2013
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Front air dam install

Has anyone installed a front air dam on the bottom edge of their rig?

From what I understand it can reduce drag by pushing the air around the coach and allowing less air to hit all the obstructions underneath. This is something all the 'eco-modders' do to their cars and trucks to improve fuel economy.
I am going to make one out of plastic lawn edging, that is 5" high and flexible enough to bend if it happens to scrape something.
Also curious to see if it affects the handling at hiway speeds.

2005 Monaco Monarch 30pdd V10
2010 Honda CRV toad
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Old 04-20-2015, 07:16 AM   #2
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Location: Winter John Prince Lake Worth FL
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front air dam install

I have often thought the same thing, The NASCAR stockers appear to be barely an inch of the track in front. I had a 2010 Toyota Prius that was VERY low in front to the point I was often hitting the road on some small deep dips. Does someone know a SAE or NASCAR car builder who KNOWS how much it would help at typical (60-70 mph) motor-coach highway speeds.

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Old 04-20-2015, 07:31 AM   #3
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I was going to put one on our previous coach. I picked up some conveyor belt material to use. It's rigid enough not to deform too much at speed and will bend over when hitting an obstruction and rebound to original shape. I never did get it installed as I sold the MH and bought a new one. After awhile, I may put one on the new coach.
There was a company that made them that would rise and drop with a remote switch
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Old 04-20-2015, 10:23 AM   #4
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Location: Motor City, Mich
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I have added one.

Fuel economy impact? Unmeasureable. Too small a difference to tell.

Handling? I have 20,000 pounds of downforce, almost 7000 pounds in the front. If the airdam makes another 50 or 100 pounds, I'll never know.

Biggest impact? Cooling. My fan used to come on quite a bit, even at highway speeds in normal, 80ish, weather. Since I added the airdam, 7.5 years ago, I think the fan has come on about 10 times, maybe. Never on the highway. It REALLY stabilizes the coolant temp.

Quoting myself from a 2007 post about my airdam addition:

I added a 15" x 8' airdam under the radiator last week. Drove to Florida from Detroit last Saturday. Ambient temps never above 75, but water temp NEVER went over 191 degrees! It's amazing to me that Ford doesn't put any airdam. Perhaps Winnebago's combination of grill opening and hydraulic leveler placement ahead of the radiator hurt my specific coach, but it would seem an airdam would help no matter what the various coach builders do. Workhorse puts an airdam, take a look at the next time you see a Workhorse chassis.

I posted pictures of it somewhere, can't seem to find the post now.

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