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Open Roads Forum  >  Tech Issues

 > Keeping water out of revoltuon mh engine air intake

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south

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Posted: 07/23/20 05:29pm Link  |  Quote  |  Print  |  Notify Moderator

The air intake on Revolution MotorHomes is on the side of the coach about 6 ft up at rear of coach on drivers side.
The intake hose goes down to the air filter mounted on side of the frame.
Needless to say water gets to the filter and all the filters seem to be paper, and expensive. Stopping up the filter and possible some water into the engine.
Has anyone found a solution or seen one?

BarneyS

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Posted: 07/23/20 06:00pm Link  |  Quote  |  Print  |  Notify Moderator

Moved to Tech Issues forum from DIY.

Johno02

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Posted: 07/24/20 02:59pm Link  |  Quote  |  Print  |  Notify Moderator

Ford v10s had the same type problem, with rain coming in the front and sucking up into the air cleaner. They made a replacement air intake for a while, but that is not available any more. My local mechanic used a plastic bottle to make a shield to go in front of the air intake, diverted the rainwater, and solved the problem. fastened in place with tiewraps.


Noel and Betty Johnson (and Harry)
2005 GulfStream Ultra Supreme, 1 Old grouch, 1 wonderful wife, and a grouchy, old, tiny dog


down home

south

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Posted: 07/26/20 10:43am Link  |  Quote  |  Print  |  Notify Moderator

The air intake is flat grid on side of the Motorhome. As far as I can find there is no commercial ready made solution. That is why I posted originally in Modifications.
Some kind of shield to fend off water spray during rain and rain while sitting still. Right now I am thinking a roll of duct tape while sitting still if it is going to rain but that stuff s not really great on paint if the sun is on it and that approach is half a.....

ajriding

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Posted: 07/26/20 01:38pm Link  |  Quote  |  Print  |  Notify Moderator

side note: water into the engine is not so bad. Mechanics, and myself, used to clean the cylinders and valves by spraying water into th eintake to give the insides a steam bath. There are engine systems out there that use a fine mist of water sprayed into the intake to help with economy. The water turns to steam, expands and helps spread the fuel particles out over the piston head to give a more powerful burn. These systems are expensive so not widely used.
The downside is water getting past the piston rings and into the crank case oil. I used to spray clean mine right before an oil change just in case.

Wet paper filters is a big issue, but it sounds like you have the right idea to jerry rig something to keep the water away.

STBRetired

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Posted: 07/26/20 02:55pm Link  |  Quote  |  Print  |  Notify Moderator

Friend has a Sportscoach with the air intake on the side like you describe. His has what looks like a little hood scoop covering the intake with the scoop opening facing the rear. Haven't heard him complain about water in his air filter. Scoop has a fairly large opening in the back so it doesn't restrict airflow, I guess.


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BarabooBob

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Posted: 07/26/20 03:21pm Link  |  Quote  |  Print  |  Notify Moderator

I have no experience with these shields but I do have a question. If the shield is tightly mounted against the side of the rig with the opening towards the rear of the vehicle, could it form a venturi effect that decreases the amount of air (pressure) that gets to the intake?


Bob & Dawn Married 32 years
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STBRetired

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Posted: 07/26/20 03:46pm Link  |  Quote  |  Print  |  Notify Moderator

I don't think at highway speeds that much of a low pressure area could develop. IIRC, the opening is about 4" X 7" (maybe 8"). The intake feeds to the turbo through the filter, so I think the turbo would generate way more suction than any venturi effect created by the shield.

lryrob9301

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Posted: 07/26/20 09:14pm Link  |  Quote  |  Print  |  Notify Moderator

Think you should look at the bottom of your air filter canister, there should be a a small water drain hole. I know mine has one.


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JoeH

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Posted: 07/27/20 06:20am Link  |  Quote  |  Print  |  Notify Moderator

On Newmars, the air intake box has a drain so that water flows out before it gets to the filter. I have to imagine your's is the same, otherwise there would have been many people logging issues over the years.
Now, some Newmar owners have discovered that the drain tube may have been sealed shut during manufacture and caused problems.


Joe
2013 Dutch Star 4338- all electric
Toad is 2015 F-150 with bikes,kayaks and Harley aboard

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