trans hose?

[Deleted]

Fox, I could go into a multi-page write up of emissions controls from design, engineering, function and repair but that is not the function of a forum.

However I will touch upon a few of the emissions controls and what they do. IF after reading that and doing some research reading on your own, you do not agree that having them function properly is in the best interests of a scooter or any vehicle owner, then you are free to continue with your practices.

Crancase Ventilation: this system is needed to remove contaminants from the engine oil that reduce its ability to function. These are generated through blowby gases. Some of the things found in blowby gases are unburned fuel, water (condensation from moisture in the air), dirt and ACID.

Excess blowby gases are created by (fill in blank) __________________________________.


Gear oil: vapors here contain water (condensation), and hydrocarbons from the oil.


Fuel Vapor Recovery: vapors from the fuel are captured in a charcoal cannister and recycled to the combustion chamber typically during periods of high load when even minute amounts of added fuel will not upset the performance, but will aid it.

P.A.I.R. : this system pulses fresh air into the exhaust with the intent to aid oxidation of the unburned hydrocarbons in it. A side benefit of this system is that it cools the engine and in particular the exhaust valve since the fresh air is directed at the valve stem (P code Chinese engine cylinder head).

Some people (especially parts sellers) call the P.A.I.R. an EGR head but that is wrong, an EGR system injects spent mixture into the combustion chamber though the intake side NOT the exhaust.

If you want to learn more about emission controls most states offer some type emissions inspector training and education program. These typically can range from a few hundred dollars to several thousand depending on subjects and depth

EDIT: I did want to add one thing to this discussion for everyone, especially parts sellers and repair shops in California. Please read the story at this link to understand:

bloodycars.com/california-arb-fines-hs-performance-1m-for-selling-illegal-aftermarket-diesel-performance-parts-in-california/

[Fox]

Yes I am aware of the difference between a p.a.i.r. and an egr. I have seen the p.a.i.r. called an s.a.i.s. as well. I had my own repair shop for about 7 years specializing in Chinese scooters. Many PAIR equipped scooters that I saw either had the hoses routed wrong or vacuum leaks due to unqualified people messing with them or the hoses were deteriorated and came off themselves. I found it easier and cheaper for my customers to just remove all that crap. I would also re-route the crankcase vent tube so instead of shooting all that oily watery stuff into the air box it would vent out the back into the atmosphere. I feel that before all this emissions stuff came into being the crankcase vent was there to give the blow-by gasses somewhere to escape so you don't pop your crank seals and I also feel that it doesn't need to be connected to the intake to do it's job. Personally, I prefer not to have oily watery stuff traveling through the air filter then onto the carburetor throat and into the cylinder but opinions vary.

On my first scooter, a 139QMB, the crankcase gasses were so hot that it partially melted my air filter element and made it all oily and filthy. That is what convinced me that it is not a good thing.



This setup which catches the oily watery stuff is better but the gasses still get sucked into the carb and if the owner is ignorant that you have to drain the catch tube periodically then it simply fills up and then the oily stuff gets sucked into the engine anyway so it's not fool-proof either. You can remove the drain plug and let it run out all the time but that gets the bottom of the engine and rear wheel all greasy and filthy so that's not really a good option.



Some guy posted this pic years ago. No air box so what do you do? Oil catch can. Simple!



For me the best method is to run the vent line up the frame and out the back end of the scooter so it vents to the atmosphere. The uphill climb keeps the oil in the engine where it should be and the gasses go bye bye. These are pics of that first scooter after it melted my filter where I routed the tube out the back. The yellow line represents the hose. I used fuel line and routed it down the inside of the rear mud guard so it's out of view. The gasses are expelled and the engine and wheel stay clean. I have seen forum members do the same thing but they terminate it near the tail light and put a fuel filter on the end of the hose.

[FrankenMech]

Strange... The crankcase vent hose emits fumes which are mostly water vapor for a long time after the scoot is shut down. It seems like those fumes could be drawn into the gear box while it cools off, -thus dumping water into the gear oil, not to mention, gasoline, acids, and other nasty things also. (puke)