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Old 09-20-2013, 10:49 AM   #1
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rear mud flap

I have a Monaco, side radiator, with a full width mud flap. I'm wondering if the full width flap is such a good idea. I know they look great, but I'm noticing how dirty the engine gets. I am wondering if the full width flap creates a bit of back pressure that when driving, dust and dirt, or when wet, spray from the rear tires get forced up into the engine area.

Since my flap isn't perfect, I'm actually considering cutting out the center section of my continuous flap in a effort to lessen the flow of this dirty air in the engine compartment.

I know there may be some loss of protection to a toad, but I'm thinking that close to the rear tires --- I bet most of it goes straight back.So if the portion of remaining flap is in line with the rear dual--- there should be adequate protection.

I wounder if anyone else has actual experience in this area and can advise me?

Loren
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Old 09-20-2013, 11:24 AM   #2
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I have the mud flaps behind the rear wheels, plus the big mud flap along the entire back of the coach. I did have trouble with the rear big mud flap, it was too low to the ground, flinging road trash up onto the toad. I cut the bottom of the flap so that it is 6" or so above the ground, which solved that problem. I have wondered about removing it entirely.

I never thought about the rear mud flap causing the dirty engine. Our engine is absolutely filthy all the time. You raise an interesting question.
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Old 09-20-2013, 12:51 PM   #3
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48 years ago I ordered a new school bus with a 1-piece full width mud flap mounted behind the rear wheels. Because we had a lot of gravel roads back then, the back outside of the bus was always a dusty or muddy mess until I finally removed the full length flap & installed standard mud flaps behind the rear wheels.

** [I also installed anti-sail brackets to keep the mud flaps down & keep dirty road water spray from flying up as much as possible.]

For the motorhome I like the combination of the anti-sail mud flaps behind the wheels and the rear bumper area mount of the full width mud flap with the slits cut every 4" to allow air to flow thru to minimize dirt clinging under & up the back of the motorhome & to offer some protection for the toad.
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Old 09-20-2013, 05:57 PM   #4
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I raised my full length "mud" flap up as high as it would go and still be seen. Now the DIRT can exit below the flap. deSanford PS now the flap doesn't drag on driveways or dirt and gravel campground roads.
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Old 09-20-2013, 09:02 PM   #5
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Thanks for your reply. I also wondered if installing flaps behind the rear dual would be more functional. I'm guessing someone thought the rear one was a good idea, and some else said hey let's put some chrome on it. Then a really good idea was to get the brand name on there, and these do look great.

I have noticed on my rig few opportunities to hang flaps directly behind the dual --so maybe that is partly why the move farther rearward. I like the idea of shortening the full width flap-- for me maybe that is the answer.

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Old 09-21-2013, 07:01 AM   #6
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Now I think I understand your situation. I think you have to put mudflaps behind the wheels. Without them, there will be a tremendous amount of dirt and gravel flying back into the engine. then, the big rear mud flap would make it worse, acting like a huge air dam.
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Old 09-21-2013, 07:16 AM   #7
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No Full Flap

I do not pull a toad but I took my full flap off the back all together and only have small flaps behind the tires. I feel it is more arrow dynamic, less drag and less dirt on back of my rig.
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Old 09-21-2013, 07:46 AM   #8
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Any thoughts on the 22" Brush Shield type flaps? \ken

Industrial Brush 3006155 Splash Stop 22" Brush Shield : Amazon.com : Automotive
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Old 09-21-2013, 08:22 AM   #9
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I have the UltraGuard solid rubber flap in the rear, plus full-width flaps behind the rear tires. I have not had any unusual amount of dirt on the engine. The bottom of my rear flap is about 4" off the ground.
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Old 09-21-2013, 09:01 AM   #10
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I have thought about the brush shield instead of the solid rubber, for now I think I'll take the suggestion of cutting off the bottom of mine and adding the flaps behind each set of rear wheels
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Old 09-21-2013, 09:43 AM   #11
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Quote:
Originally Posted by Firemandave View Post
I have thought about the brush shield instead of the solid rubber, for now I think I'll take the suggestion of cutting off the bottom of mine and adding the flaps behind each set of rear wheels

Dave, I think a big rock will go right through that brush-type guard and put an awful peck in the front of your toad! I can see it being effective on dust, but not so much on larger things! JMHO
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Old 09-22-2013, 08:59 AM   #12
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True, I hadn't thought of the road debris hitting the towed car through the brush type. it already gets black from the radiator blowing out road dirt after a light rain.
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Old 09-22-2013, 09:33 AM   #13
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Just went out and bought this brush style "flap." Initial assessment: It's significantly lighter than the factory "air dam" mud flap, and the bristles are like stiff, small nylon cord; quite hefty. Will install today. Hope that it helps to keep engine cleaner while [still] managing debris hitting the toad. I'll let you know after the next couple jaunts. \ken
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Old 10-11-2013, 07:38 PM   #14
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My first RV had the "bristle type (Dirt Skirt) and my second had a version of the solid type (Rock Solid) that uses vertical rubber strips instead of a solid rubber flap. Both RV's had the smaller flaps behind the wheels as well. Both systems worked well for me and I never had any issues with rock chips on the toads. I don't believe I had any issues with excess dirt ending up in the engine compartment with rear radiator so not sure it should be an issue for you with a side radiator layout.

The one caution I did read somewhere was to make sure the flap does not hit the road as the suspension works since it might well throw up road debris onto the toad. I think min. 2" clearance at ride height was recommended.
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