Topic: Intek 31 cube oil overflow

[Michaelgc7]

Any advice would help a lot here since i havent had this probleme yet  Basically i have a briggs 31 cube without any performance parts but built with old school tricks. So i have not had an intek that had oil overflow out of the breather but this one does a lot. I currently have a catch can connected to a tube that runs to the stock breather. The problem is that my catch can filled up to the point of spewing everywhere during a ten lap race. I was wondering first of all if this is normal since i know many of you do run catch cans, secondly what the best catch can setup would be, thirdly, whether or not i should remove the steel flap in the breather and lastly if i should run a return line back into the block or a ideal location. Thanks in advance 

[Michaelgc7]

And while we're at it what is the exact cause of the oil overflow through the breather? is it because of the higher rpm's?

[coon B14]

If u add to much oil it will blow out till it finds where it wants to run normally 1 qt of oil

[Mowerpar]

could be a blown head gasket too
right in the pushrod area is the usual culprit spot

[leadslead]

Did u modify the oil hole in the block??? So oil can return to sump quicker ... I only run a qt when I had my singles also I made a aluminum plate for it with. A 90 deg elbow ... Put a hole on it with fuel filter so no dirt would get in ther

[foolnhismoney]

If your oil level is right, your head gasket is not blown and you haven't monkeyed with the breather assembaly you should have no problem.  With that said the biggest reason to push that much oil out the breather is to much crank case pressure. That happens when you have more air being pushed out then being drawn into the crankcase. The most common thing is rings are plane worn out and when cylinder is in compression stroke the air pushing by the rings is creating a pressure in crank case instead of a vacume behind the piston. Then right after that on power stroke you are still in a pressuere mode. it has to be equal in and out of breather. On the intek singles the biggest problem can be a blown head gasket but I'm pretty sure you checked that when you did your oldschool tricks. First rule of thumb on small engines check head gaskets in my opinion.

[GRUBDIGGER]

If your oil level is right, your head gasket is not blown and you haven't monkeyed with the breather assembaly you should have no problem.  With that said the biggest reason to push that much oil out the breather is to much crank case pressure. That happens when you have more air being pushed out then being drawn into the crankcase. The most common thing is rings are plane worn out and when cylinder is in compression stroke the air pushing by the rings is creating a pressure in crank case instead of a vacume behind the piston. Then right after that on power stroke you are still in a pressuere mode. it has to be equal in and out of breather. On the intek singles the biggest problem can be a blown head gasket but I'm pretty sure you checked that when you did your oldschool tricks. First rule of thumb on small engines check head gaskets in my opinion.

AND IF ITS NOT THE HEAD GASKET IT WILL BE THE RINGS.

[Michaelgc7]

this engine was built new this spring and gapped properly, it does have more compression than stock... could that do it? is it serious? i put a catch can with a return to the engine but it does have the recommended amount of oil with is a liter and a half if i remember right..

[BIG AL 202]

HEAD GASKET

[Huffy044]

I had one do this, I moved the hose for the catch can to the top of the valve cover, welded a 1/8" nipple at the higest point, got it out of the oil mist as far as I could.

[BIG AL 202]

IF YOU DON'T WANT TO TAKE IT APART YOU WILL NEED TO DO A LEAK DOWN TEST. DO A COMPRESSION TEST THEN PUT A SMALL AMOUNT OF OIL INTO THE CYLINDER AND SEE IF THE COMPRESSION GOES UP. IF IT GOES UP IT'S RINGS, IF IT DOESN'T EITHER VALVES OR HEAD GASKET.

[rotten ron]

Leaking valves won't cause crankcase pressure

[Michaelgc7]

thanks for all the help.. could it simply be too much oil with high rpms and the breather in line with the internal mist? Valves were gapped properly and rings also.. they are like new.. (when i built it this spring i have a race on it)

[foolnhismoney]

I am going to go by your avitar and assume your a Briggs MST, I am as well. So i would believe your rebuild is solid. It has to be a simple thing you are over looking. Like a breather issue or something like that. Without any way to put our hands on it and look at it my opinion would be look at breather set up. Otherwise you need to do all the test they teach you in small engine repair to figure out the problem.  it shouldn't be to hard  to get a handle on this. Someone already suggested the compression and leak down test all part of basic small engine repair. Those two things will tell you almost everything you need to know. Or at least an area to recheck.

[Michaelgc7]

Yes i am a master tech and i will do a leak down test, thanks for all the advice. If everything comes up positive then i wont worry about it since i put a catch can and a good oil return. It doesnt come out at the breather when i run it without racing, only after some ten intense laps, it might simply be too much oil for 6000rpm..