Hose Routing with Air Pods

[sam98177]

Thanks for all the replies. This next weekend, I'll be ready to install the pods; (should have the new jets in the next couple of days).

I was hoping someone could post some pics of their pod setup, so I can get some good ideas for hose routing and such, inorder to be prepared to install mine.

Thanks,

Sam

[Ivan]

I would think, actually, that filters are unecessary on crancase breathers.

What we should have in there is a pcv valve. Normally speaking there is no flow INTO the motor on those breathers. The one-way check (pcv) valve would negate any intake, yet still allow pent up pressure to escape.

I believe a secondary function of a pcv valve is to allow a small amount of crancase pressurization to negate anything from entering through any opening, and to allow a small amount of counter pressure for the nominal blow-by past the rings?

A PCV valve is not to control pressure. In a PCV system, vacuum is applied to the crankcase via the engine, usually on one side of the valve cover, or one side of the engine. The other side of the engine or valve cover will have a filtered inlet so the vacuum doesn't suck dirt into the crankcase. The PCV valve is in the suction side to prevent intake backfires from igniting the blowby and grenading the engine. Usually this would happen on a cranks but no start condition. I have seen a bypassed PCV valve blow a valve cover off a Chevy small block.

On a draft type crankcase vent system, the PCV valve would cause a pressure build up in the crankcase, which is a bad thing.

The purpose of the PCV system is to evacuate blowby from the engine before it can contaminate the oil. Acids and moisture degrade the oils much faster than fresh air. So basically, you can run more miles before an oil change is needed, and the oil works better, so the engine lasts longer.

[sam98177]

A PCV valve is not to control pressure. In a PCV system, vacuum is applied to the crankcase via the engine, usually on one side of the valve cover, or one side of the engine. The other side of the engine or valve cover will have a filtered inlet so the vacuum doesn't suck dirt into the crankcase. The PCV valve is in the suction side to prevent intake backfires from igniting the blowby and grenading the engine. Usually this would happen on a cranks but no start condition. I have seen a bypassed PCV valve blow a valve cover off a Chevy small block.

On a draft type crankcase vent system, the PCV valve would cause a pressure build up in the crankcase, which is a bad thing.

The purpose of the PCV system is to evacuate blowby from the engine before it can contaminate the oil. Acids and moisture degrade the oils much faster than fresh air. So basically, you can run more miles before an oil change is needed, and the oil works better, so the engine lasts longer.

This is interesting about the PCV, but with all due respect , I think my thread got hijacked and off track. Anyways, anyone have any detail pics of their Air Pod setup or details about how they routed their hoses, secured the carbs from falling off without the airbox and such.

Many thanks,

Sam

[Ivan]

I'll see about getting a pic of what I did tomorrow for you.

[Crazcnuk]

Your talking a closed system, which these bikes are not, nor can they be.

I was talking about putting them on the XS11.

"On a draft type crankcase vent system, the PCV valve would cause a pressure build up in the crankcase, which is a bad thing."

All of them used to be this type, and they didn't harm anything. That is why they had a preset spring in them to provide a slight pressure, to keep crap from being sucked in every loose gasket in the engine.

On the new ones, the system is closed with positive vacuum provided by the intake manifold. The pcv valve can be used to limit the amount of vaccum in the system, as all you need is enough to get the blow by gases back in the cylinders where they belong.

The main reason for this is because there is so much unburnt fuel in the bloe by gases that it would build up in your oil if left in there.

Almost all the so called emission controls are designed to capture and reburn unburnt fuel.

[sam98177]

Ok, should I:

1)plug up the crankcase hose with a pcv valve

2)drill out the back of one of the pods (maybe #2 or #3) and push the hose
into the hole so that it would reburn the fumes

3)plug the crankcase hose with an individual filter

4) Tee it with the other two hoses that used to go into the breather box and route all those into an indivual filter or into one of the middle pods


5) just let it hang freely

6) or what else?

Sam

[bikerphil]

#3

[sam98177]

I hope I don't sound like a knucklehead now, but the more I think about this crankcase hose, I'm getting confused.

Does the crankcase suck or blow thru this hose? It looks like where it hooks to the airbox, there's a quad of plastic hoses that dumps straite thru the boots to the carbs. It would appear to me that it blows. So if that's the case, plugging the hose with a small filter would cause too much pressure to build; is that right? Or is there not enough restriction in the small replacement filter to cause that?

Thanks to all for the responses,

Sam

[Ivan]

I hope I don't sound like a knucklehead now, but the more I think about this crankcase hose, I'm getting confused.

Does the crankcase suck or blow thru this hose? It looks like where it hooks to the airbox, there's a quad of plastic hoses that dumps straite thru the boots to the carbs. It would appear to me that it blows. So if that's the case, plugging the hose with a small filter would cause too much pressure to build; is that right? Or is there not enough restriction in the small replacement filter to cause that?

Thanks to all for the responses,

Sam

It blows. The pressure comes from minor amounts of combustion gasses passing by the rings, and it has to have somewhere to escape.

[sam98177]

It blows. The pressure comes from minor amounts of combustion gasses passing by the rings, and it has to have somewhere to escape.

So, would putting a small filter on the end of it be too restrictive and cause a harmful pressure build-up?

[Ivan]

Nah, thats what I did with mine, and haven't had any troubles.

[skids]

Nah, thats what I did with mine, and haven't had any troubles.

They do make washable crank case filters. PS, I had to use a reducer (Hose stuck into a hose) to connect mine to the cut-off crankcase hose.

[sam98177]

I received my jets in the mail today, and dang it!, I misordered. The Main Jets (145.0) I ordered have a smaller head size of 6 mm, Mikuni Small-round Mains N102.221. I reckoned I should have order the ones with the head size of 8 mm, Mikuni Large-round Main N100.604.

Will the smaller head still work ok? I just now left a message for the owner of the site: http://www.jetsrus.com , but maybe I'll get a quicker answer here.

Thanks,

Sam
1978 XS1100E

[sam98177]

I received my jets in the mail today, and dang it!, I misordered. The Main Jets (145.0) I ordered have a smaller head size of 6 mm, Mikuni Small-round Mains N102.221. I reckoned I should have order the ones with the head size of 8 mm, Mikuni Large-round Main N100.604.

Will the smaller head still work ok? I just now left a message for the owner of the site: http://www.jetsrus.com , but maybe I'll get a quicker answer here.

Thanks,

Sam
1978 XS1100E

Never mind. The owner just e-mailed me back and said the smaller head will be just fine. Hopefully, I'll have her on the road by next week.

Sam