Oil spewing monster HELP!!!

so after my upgrades my crank case vent spews oil like even with a 2' hose and a valve breather filter.....but only at high rpms or should I say shortly after high rpms.......is there a way to valve it to not spew oil or let it breath and use the oil pressure to feed the oil into the cams?? What would high pressure in The crankcase result in?? Or like a siphon valve ( pardon the poor spelling think ) to let of breath and port it into the valve cover to drain the oil over cams...........never had a problem with the airbox flooding with oil so I know that its not because of to much oil being in the motor
any thoughts
-rye

 

sounds like ring blow by.

 

I have sort of the same problem but only smoke. Would capping off the vent tube result in any negative effects?

 

I would do a leak down test or a simple compression test on your cylinders to see if your rings and pistons are in bad shape. If the compression is low and you squirt oil in and it goes up alot your rings may be bad. You should not have so much pressure building up to blow oil out like that. How many miles do you have and what kind of oil are you running?. The engine needs to breathe so I would not plug it off the pressure will have to go somewhere it could blow out your seals. Good Luck

 

its an xj700, pushing 32k miles just rejet, pods, and pipes....until the upgrade never had a problem with the crankcase vent.....no smoke out of the pipes so can't imagine my rings are gone doesn't seem to be burning oil....just when high rpms then fall ( like running through the gears getting up to speed off the line ) few seconds after the rpms fall it comes out....!?!?!?!

and its hot hahaha on my leg

 

So where is your oil level ?
Changed your filter lately ?

 

nah didnt do an oil change during upgrade, I'm waiting for an adaptor so that I can switch over to spin on filters so I didnt bother changing it when I rejet and whatnot....so the oil is spec to my service manual ( changed it like a month ago )

 

Is the valve cover on the xj700 high pressure or is it just the bottom case? I'm thinking if its not I'll set it up so the excess oil pores onto the cams, and set the vent up like a syphon break so the pressure will still be vented......unless the valve train is at pressure to then I'm thinking I will set up like an overflow res. for the vent so that it won't spew the oil just move I to the res. and vent it there the crank pressure there....both would allow the oil to drain back into the motor and keep the crank pressure down.......any thoughts????

 

Do you have the crankcase vent hooked up to the air box??
Did you actually checked the oil level?

 

Oil level is fine I think didnt have a problem with the airbox flooding and the airfilter was not oil saturated before I pulled it out to put on the pods....no more air box...pods....crankcase vent on a hose up to valve height and a matching pod on it...

 

The crankcase pressure has to be coming from somewhere. I would not rule out worn valve guides or pistions and rings. The key here is to pin pinpiont the culprit. I checked my black 750 and there is oil in the air box but not bad. just a light coating. If I start it up with the oil cap off there is alot of air coming out. It has 13K on the odometer but I think it has way more. The guy I bought it from i think swaped the speedo/ tach out from another bike. I would bet I have 30 plus K on this one. So I'm going to get my friends Snap On Leak Down tester and see where this engine is at. Air cooled running lean and hot at one point or another could have done some damage.

 

well havent done a leak down, but checked compression on all the cylinders without dropping oil and the after dropping oil into the cylinders and the pressure stayed the same so i doubt its ring blow by....or worn rings...i wonder if its a possibility that the pressure is higher than normal given the performance upgrades...?? that would be why stock i didn't have any problem with the amount of oil in there sprayin my airbox but now im all hopped up the ammount of oil i should keep in there may be lower??on another thread i read that for close to the same set up it way too much oil ( the factory recommended ) than what i need? that seems a bit odd to me though? ?