OK guys little info on the car and what I use it for.
99 civic with a b18c block( fully built) with a b16 head fully built also everything is fresh 13.8:1 comp pro 3 cams. Broken in and tuned by King motorsports.
I race on a circle track (oval pavement 1/3 mile slight bank.)

Problem I had is while running a 10 lap race I had oil blowing out of the catch can. Catch can is located in stoxk battery spot with 3 filters on top.can is mounted higher and filters are outside the hood. The filter on the left side was soaked and oil had sprayed out onto the fender and tire. There are 4 lines coming from valve cover and 2 coming off the block. Nothing is wrong internally as the motor has 295 psi across all cylinders. Have tried to research this problem but haven't found a straight answer to it. Do I need to get rid of the 2 line of the block. I'm never off the throttle so they never go under vacuum. Motor is always between 5000-9000rpm. Any help would be appreciated. The stock pvc system is completely gone. This isn't a street car just a racecar. Thanks

 

Is the valve cover baffled properly? If it is not baffled where the hoses plumb in, oil from the cylinder head can be sucked/pushed into the lines. Over filling the engine with oil can cause this too. You do not want to delete the two lines on the block, as that is where the oil drains back to the engine from the catch can. Could be that they are clogged or not working. Is the catch can filling up with oil, or is it just excessive oil vapors? You can always take off/block a couple of lines to see if you get the same results. Either the 2 lines in front of the valve cover or the 2 in the rear. I would make sure oil is draining back to the block though. Which way are the turns on the track you are on? Maybe the can is not able to drain back to the block? Maybe I am over thinking this??

 

The turns are to the left like nascar. The problem is the 2 lines only drain back into the block under vacuum when the throttle is let off. I don't really left off the throttle at all and the rpms are always higher. I will check the valve cover bungs but pretty sure they are both under baffles. Everything is brand new. This was first race on the entire setup so they aren't clogged

 

May need to a pump or something to force oil out of the catch can and back into the block. Have you talked to anyone at the track? I would think someone is running a similar set-up and has seen this issue before.

 

Noone at my track runs a honda besides me.

 

Is the car turbocharged?
Are you leaking mostly a mix of vapor oil residue? Or straight up oil?
How are the lines routed at the catchcan? Make sure the lines coming from the valve cover are near the top of the catch can, and the 2 coming from the block are near the bottom of the can. If the lines coming from the block are at the top, the can won't be able to drain as they're gravity drained. This would cause the can to fill up and drain while you're turning.

 

The car is n/a. The top 4 lines off the valve cover go to the top of the can and the two off the block go to the bottom. I took the lines off the block tonight those seems to have more oil and not vapor residue the top lines had more of the vapor residue. There was strict oil that leaked out of the can. This is the type I have.


Thats not my exact catch can buy i have all 6 lines on mine.

 

What size lines are you running? The smaller diameter the line, the faster velocity the blowby travels, the more oil the blowby carries with it. I'd run -10 AN if you aren't already.

Make 100% sure the lines going down to the block are always on a smooth downward slope, and there's absolutely no area where it has any "uphill" travel.


Is the can baffled?

 

The lines are -10an. I took the lines off the block for now ND capped the ports on the can and the block. I'll run the car on friday and see if I get the oil spilling again. A guy told me that when he ran 2 of the block and he would be in the burn out box for drag racing banging the Rev limit for a while oil would come out of the catch can. My last race I hit 9k down the straights 2 each lap for 10 laps. I think the high rpms just sucked all the oil that was draining back into the block from the head.

 

Yeah the back ports tend to allow a lot of oil to come out temporarily. In a drag setup where we are only in high rpms for short amounts of time, the can has s chance to drain back. Since you are at high rpms for a majority of the time, that may be what's stopping the can to be able to flow back into the back of the block.

Is the can baffled?

 

Yes the can is baffled. I don't mind having to empty the can between races just can't have it pour out while racing