Where do they go!
 

I'm working on an F4i engine and we are trying to hook up the lubrication system (oil connections) and there are two hoses that we have no idea where they go to. We have a service manual but it does not show where the hoses go or what they attach to. they are located directly below the fuel injectors. here are some pictures we took.

I'm not familiar with those connections. Judging by the picture, they go into the head below the intake stacks... but this isn't a 2-stroke and doesn't use oil to lubricate the cylinders... so that doesn't look right to me...

thats kinda what we thought except oil is spitting out of the hoses when the engine cranks. and those hoses are present on all of the engines I have seen for sale on E-bay. is there another component that runs on oil somewhere else on a typical bike? Also I was looking on-line and students from MIT's formula SAE team were talking about an oil de-aeration cylinder that helps remove air from the oil which makes sense because we didn't get oil spitting out of the hose on the left. this is a pic off from an ebay page and you can see the hoses there as well.

Look up the PCV system routing... maybe

Here's more info (it's not really bike-specific, but there's pics on page 5 or 6 i think)
http://www.stuntlife.com/forums/443-...-my-636-a.html

Those look like the air intake vacuum hoses. The should go to the underside of the airbox and I think should be one on each side of the air box.

but why does oil come out?

they wouldn't go to to the EVAP purge control solenoid would they?

wait... could those hoses be running to the air cleaner that sits on top of the throttle bodies?

Just by looking at the picture, I think those also go to the airbox on each side

but why would oil spit out of the hoses? This engine is for a Formula SAE car so we are planning on designing our own intake system. what would that mean for those hoses if they were going to the airbox?

I can't say why oil comes out. But since you are doing a custom job, ensure you have the engine mounted at the right angle.

The vacuum hoses (i'm not sure 100% here) running to the airbox are usually part of the PCV (positive crankcase ventilation) system of an engine and also manage the warm/cold air mix. That's from many years ago on old car carb'd engines. The drawdown on the intake header/airbox is used to generate the vacuum running other functions on the engine.

yeah i knocked those off when i was installing a manual ape cct on my bike. they go to the air box. but i do not recall oil spitting out mine, i think something is weird here.

Should I just run it with a catch under the hose and hope that the oil stops coming out? Or could I just cap it? Do I even need the vacuum hoses to run the engine?

Is there that much oil coming out, really sounds wierd. Sometimes a little oil vapour condensation in the hoses might occur but what you say seems like you have an oil line in you hands. How much oil do you have in the engine? Does it start / run ok?

Wierd.

yep it starts but like after 5-10 seconds oil "spits" out its not a constant stream. you think that
it maybe something thats a fluke and if i were to run it longer it would stop? I mean you saw the pics i posted those are the lines. we put somthing like 3.5 quarts in there. Is that to much? I watched the oil window on the side of the engine and stopped in the appropriate spot.

3.5 is about perfect so thats not your problem.

throttle body tubing? http://www.bikebandit.com/assets/sch...a/HJ510045.gif

edit: hell i dont know

actually we found out it was a plug that wasn't in place lower on the the engine, same vicinity so thats why we thought it was the hoses. That problem is solved but a new one has come up... what goes in the hole that I have high lighted in the picture. Oil pours out of this hole, im talking like a steady solid stream. we were thinking an oil pressure gauge but there is noting about a gauge being there in the manual.

Anyone... anyone? Bueller??

maybe an oil pressure sending unit?

i believe that's an oil pressure switch
35500-mj4-024