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Crankcase vent- stinks!

Jethro

Jethro

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I put a fancy air filter on my crankcase vent line and routed it to under the right side frame cover. Man, it look so coooool!! :?

Anyway, the odor that comes form that thing is nasty! Very heavy with the smell of gas. I am 100% sure my petcock and float valves are keeping gas out of the crankcase- is it normal for the vent to smell of gas?
 
Gas? No. Oil vapers yes with maybe a bit of a fuel smell but to really stink of raw gas no. Maybe clean the filter and then pop it back on? Might be something on the element?
 
Long notes
Hey Jethro!!!
I can't figure out what size hose goes on the crankcase vent spigot.
I have a hose on there that is WAY too big but I cut a section out of it lengthwise and duct-taped and epoxied it to the size of the crankcase spigot that sticks out of teh engine.


Cliff notes: What size hose goes on the Crankcase vent?
:lol:


Thanks,
Dm of mD
 
Detman, I'm not quite sure myself, here is how I attached mine- I used the original hose that usually connects to the air box (which both you and I no longer have), then I stuffed a 1/4" hose inside that tube and cinched down with a hose clamp. This allows me to adjust the length of the hose fairly well by sliding it up further inside the other hose.

I'm guessing the size of the hose that clamps on to the breather cover is about 3/4" or so? It's pretty big...

Maybe clean the filter and then pop it back on?
Click to expand...

The filter only has a few hours on it. And on the cold mornings steam pours out of it- I'm guessing that's totally normal due to heat of the engine. The smell isn't like raw gas, maybe it's just what hot oil smells like? I was suprised to have it smell so strong though.
 
Kewl, Thanks Jethro!

I'll have to buy some of both size hoses later...


Dm of mD
 
You may just need to get used to it then. I have mine routed down beside the battery box. My other bike though has it right under the tank and I never noticed any smell or steam? I wonder if that is normal for the 1100? It shouldn't be excessive I wouldn't think?
 
When I first brought my bike home it had a real bad petcock and my crankcase filled with gas. Eventhough I have had the carbs rebuilt and a brand new petcock put on that I am sure 100% doesn't leak with engine off, I have been hypervigilant about checking the crankcase for the gas smell. Which I immediately thought I was smelling, however I had a couple of friends smell it on a little ride and they both agreed that was what hot oil in old engine smelled like.
 
Yes! The answer I was looking for. It's normal.

I've always liked an old, stinky, pig. 8O
 
Jethro also remember the more loose your engine is the more blowby thats going out the vent You probaly did not want to think about it did you ??
 
Jethro,

1/2" ID at the crank vent, fit the filter as needed. Mines a K&N, 3/8" OD. I put a short piece of 3/8 ID hose on the filter and slipped it inside the 1/2". Phew. GS1100ED's don't get loose, just the back tire. :lol:

Chris
 
I have run filterless on both of my GS's...and I got annoyed with the current setup venting crankcase below me under the tank. I ran a 3/8" heaterhose line from Autozone (2 feet was plenty) down under the carbs and out on the right side near the rear master cylinder. So far so good...I think I smell less like crankcase vent gas now. :)

~Adam
 
If I remember correctly, Joe Nardy had run his back under his seat near the rear fender. This was while he was still doing some winter work and it was apart. You may want to PM him Jethro.

Brad tt
 
bradleymaynar said:
If I remember correctly, Joe Nardy had run his back under his seat near the rear fender. This was while he was still doing some winter work and it was apart. You may want to PM him Jethro.

Brad tt
Click to expand...

All I did was 'borrow' Keith Krause's setup. All the credit goes to him. With this setup I occasionally get a whiff of gas but it is hardly noticeable. There is some gunk buildup in the cup that can be dabbed up with a paper towel. All the credit for this setup goes to Keith:

site1039.jpg


Another option is to run the hose all the way back along the frame rail to the rear cowl and forget the filter. This is how the old 1000cc superbikes did it.

Joe
 
stiksave said:
Jethro,

1/2" ID at the crank vent, fit the filter as needed. Mines a K&N, 3/8" OD. I put a short piece of 3/8 ID hose on the filter and slipped it inside the 1/2". Phew. GS1100ED's don't get loose, just the back tire. :lol:

Chris
Click to expand...


Awesome!! THanks for the figures. That makes it much easier!

Dm of mD
 
http://home.comcast.net/~keith.krause/wsb/media/125705/site1039.jpg
Click to expand...

I had mine exactly like that, but then I installed a storage box over the battery. It's now routed right above the rear master cyl, just so that you can see it a little below the frame cover.

remember the more loose your engine is the more blowby thats going out the vent
Click to expand...

Mmm, I didn't want to think of that! But I'm not worried. First, I'm extremely anal about the bike, and I'll bet most people wouldn't even say they smell it too much. Second, I had just completed a valve clearance, and a compression test. All cyls are 175-185. I don't burn any oil between oil changes. I don't think it's too loose, but I guess only time will tell.
 
I was wondering does anybody have a idea to reroute it back to the engine so it wuld no longer be an issue for so many of us ??
 
Its a vent, so you cannot route it back into the crankcase. You could install a pvc hose barb into the side of a couple of your pods and with a Y, feed the fumes into a pair of carbs.

Earl

graham harron said:
I was wondering does anybody have a idea to reroute it back to the engine so it wuld no longer be an issue for so many of us ??
Click to expand...
 
Earl, that's a genius idea. Question is, feed to the outside or inside carbs? Don't wanna cause detonation in the innner cylinders.
 
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