Lack of engine anatomy knowledge.


Information and questions on GL1100 Goldwings (1980-1983)
Post Reply
wlane
Posts: 12
Joined: Mon Apr 01, 2019 11:19 am
Location: Roanoke Virginia
Motorcycle: 1981 Honda GL1100 Goldwing

Lack of engine anatomy knowledge.

Post by wlane »



This hose is attached to the engine block on the shifter side. It's about 5 or so feet long and has oily something in it. The prior owner had it curled up near the air filter. Can anyone tell me what it is and where it attaches?
Attachments




User avatar
dingdong
Posts: 4122
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: Lack of engine anatomy knowledge.

Post by dingdong »

That hose normally connects to a canister with a foam filter that collects oil byproduct residue from the crankcase. Part of the emission system. Another hose from the canister connects to the air filter housing and returns gasses to the combustion system. Another hose from the filter canister goes to the street.
wlane
Posts: 12
Joined: Mon Apr 01, 2019 11:19 am
Location: Roanoke Virginia
Motorcycle: 1981 Honda GL1100 Goldwing

Re: Lack of engine anatomy knowledge.

Post by wlane »

Thank you very much. I'm still trying yo straighten this bike out. It runs great but sat for a while in a driveway.
User avatar
WingAdmin
Site Admin
Posts: 22241
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer

Re: Lack of engine anatomy knowledge.

Post by WingAdmin »

When fuel burns in the cylinders, some of the pressure escapes past the piston rings and into the crankcase. It has to vent somewhere, or else you would blow out the seals in the engine. So there is a vent hose at the top of the crankcase - that's what this hose is that you see. The hose routes the burned or semi-burned hydrocarbons (which are extremely polluting) back into the intake manifold, through the air filter chamber. From there, they get sucked back into the engine and re-burned with new fuel.

One of the byproducts of combustion is water. This water vapor, along with oil mist, also ends up in the air filter chamber. The water vapor can condense into liquid. This oily wet mess has to go somewhere, it can't go into the engine, so it drains into the reservoir. That reservoir should be emptied periodically.

GL1100 Crankcase Breather
GL1100 Crankcase Breather



Post Reply