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Crank case vent - excess condensation??

This is a discussion on Crank case vent - excess condensation?? within the RZR 900 Engine forums, part of the Technical category; Anyone notice all the moisture developing in the top of the oil fill area and in the crank vent hose? It is much worse on ...


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  #1  
Old February 27th, 2012, 10:00 AM
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Crank case vent - excess condensation??

Anyone notice all the moisture developing in the top of the oil fill area and in the crank vent hose? It is much worse on mine now with the added resistance of extending the vent hose with the snorkels
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  #2  
Old February 27th, 2012, 10:29 AM
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Re: Crank case vent - excess condensation??

I have a filter at the end of the stock hose (where the OG air intake was) and I ride the sand, There are alot of oil fumes that sand sticks to.
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  #3  
Old February 27th, 2012, 10:52 AM
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Re: Crank case vent - excess condensation??

Very tipical to have vapor... Also Polaris put a slit in that line that allows sepage...
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  #4  
Old February 27th, 2012, 12:10 PM
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Re: Crank case vent - excess condensation??

ya, i removed the stock line that had the slit in it.

Just seems crazy that these motors are producing so much vapor/steam. i'm just worried about it backing up into the motor and milking the oil leading to a spun bearing. Our high compression rotax motors build more than stock but this 900 is crazy.

I'm going to pull the bed and separate the canister when I get a chance. I want to see how exactly it is made and see if anything can be done to help.
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Old February 27th, 2012, 06:02 PM
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Re: Crank case vent - excess condensation??

pictures of what I am talking about. The oil itself isn't milking but I'm certain the top of the tank will fill to the point that it will get into the engine oil over time.



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Old March 5th, 2012, 10:40 AM
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Re: Crank case vent - excess condensation??

more pics. I took the bed off and removed the oil reservoir to flush and clean everything. Even the valve cover vent line had this crap backed up in it so I know its on the valve train. I'm in the process of flushing the motor good so everything should be fine.

I rerouted my vent hose right back into the air box so their is no resistance and should eliminate the build up.

FYI, this was from 1 ride.

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Old March 5th, 2012, 10:54 AM
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Re: Crank case vent - excess condensation??

I'm no expert, but that sure looks like "milked" oil to me, or at least oil vapors mixed with a liberal quantity of water vapor; just saying.......

Cheers
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Old March 5th, 2012, 11:04 AM
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Re: Crank case vent - excess condensation??

Neither the crank case or reservoir oil was milked, but technically what you are looking at is "milked" oil. The dipstick pulls clean oil and the oil drained is perfectly clean with not even a streak of moisture. This saturaded oil is only on the venting side of the oil circuit.

There is no doubt that it is from the crank vapors condensating in the top of the reservoir and in the crank case vent line. Motor has not been sunk and water wasn't that deep on the first ride.

I had a loop in my crank case vent plus it was extended to the top of the cage. I always loop my case vents because if they do get sunk at least it will catch the water for me to unconnect and blow out backwards. In this case, it caused to much back pressure and had a negative effect. I have a clear 3/4" line going straight to the air box to test the effects.
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Old March 5th, 2012, 11:20 AM
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Re: Crank case vent - excess condensation??

Quote: Originally Posted by coker6303 View Post
.......

There is no doubt that it is from the crank vapors condensating in the top of the reservoir and in the crank case vent line. Motor has not been sunk and water wasn't that deep on the first ride.
"........The dipstick pulls clean oil and the oil drained is perfectly clean with not even a streak of moisture........." Whew!; had me worried there for a bit!

"......In this case, it caused too much back pressure and had a negative effect. I have a clear 3/4" line going straight to the air box to test the effects.......". Yes, that makes perfect sense to me, since vent-line pressure is so low that it would be easily overcome by line-resistance in a long tube, leading to stagnation. The line going straight to the airbox should solve your problem.

Cheers
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  #10  
Old March 11th, 2012, 05:57 PM
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Re: Crank case vent - excess condensation??

check it out. Here is a video of my 900 idling at operating temp, fan has already cycled. You can see how much blow by and steam I have coming out. On other motors I have been around, we haven't seen this much venting unless we are running 12.5:1 or higher compression pistons.

Still driving me nuts! It doesn't milk the oil or leave traces. but the condestation continuously lines the upper chamber of the oil reservoir.

Motor has not been sunk, this is not the same as milking the oil itself so don't get confused. Motor is bone stock with 500 miles. I am running an advanced tune with each cylinder tuned out using my PC5 and dual autotune.

Notice the white on the threads inside the can, the entire upper will coat itself with a mixture of oil vapor and condensation.


Last edited by coker6303; March 11th, 2012 at 06:05 PM.
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Old March 12th, 2012, 04:58 AM
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Re: Crank case vent - excess condensation??

That's close to what I'm seeing for venting. 95mm big bore and 11.1:1 pistons in mine. Do you notice any oil consumption? How much?
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Old March 12th, 2012, 06:38 AM
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Re: Crank case vent - excess condensation??

I change my oil too much to tell consumption. No haze or puff out the exhaust that I or anyone in the group has seen.

I would expect it on a larger bore higher compression motor.

Is yours causing the upper chamber to build up milky oil on the walls?
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Old March 12th, 2012, 11:06 AM
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Re: Crank case vent - excess condensation??

No, and I check my oil daily. That milky build up has me stumped. Is it cold where you are? Is the machine in the cold when you start it?
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Old March 12th, 2012, 12:47 PM
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Re: Crank case vent - excess condensation??

I'm in Houston, TX so humidity could be an issue. It has been very cold last couple of times I've been riding so condensation could easily have built up but I would expect it to burn off or go away after a while.

I'm confident my original crank case vent hose route caused the condensation build up in the can originally but I have since pulled the oil reservoir and thoroughly cleaned everything. I'll be going no a short ride this week and then a 4 day ride the last weekend of the month. We will see how it does then.
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Old May 21st, 2012, 08:47 AM
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Re: Crank case vent - excess condensation??

The excess condensation was most likely caused by the water pump seal beginning to leak. If you see signs of moisture in the top of your dry sump tank like I did, go ahead and change the $7 water pump seal as a precaution.

See here for my findings
http://www.rzrforums.net/rzr-900-eng...gn-flaw-2.html
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