Blow-by - And just generally oil up the shiznit

[BobWrinkle]

Ok I believe my car suffers from hardcore blow-by which then causes it to hunt and stall durin idle when warm. And there is also oil all over the place around the drivers side front corner of the engine.

So 2 questions.

What could cause blow-by? (I do have a shitty eBay oil catch can hooked up to both lines from the rocker cover)

And what is the most likely thing to leak on that corner of the engine?

Cheers
Cade

 

[aurace]

rocker covers are notorious for leaking. too tight and you strip them - too loose and it leaks.

is your intake piping gunked up with oil?

 

[BobWrinkle]

no, my intake pipe is a custom jobby that goes straight from aircleaner to turbo, no valves for oil.

The lines from the rocker cover go straight to the oil catch can witch is vented. But it is cheap and nasty.

 

[EVO-00X]

A lot of the engines I've seen show first signs of oil leaks (apart from the sump) on the drivers side corner above the gearbox because of the angle of the motor and because the headgasket needs retensioning/replacing. If its not between the head and the block, look up to check a good seal around the crank angle sensor and rocker cover.

To improve crankcase ventilation and alleviate pressures under the rocker cover you can cut off the stock small piping from the rocker cover to your catch can, and re-tap it for a larger diameter fitting and thicker hose to your can :wink:

 

[JAP63]

Put a catch can on your VR4 and it will stink
Modify the engine and run more boost and it will really fukin stink.

Check your dipstick isnt popping off,if it is,it means your pressurising your sump cos of ur less than optimal E-Bay catchcan.if its not then thats a good thing,but if your can is filling up every 5 days uve got excessive ring blowby,but id doubt it.

The spring on ur PCV valve regulates the amount of oil or oil vapour that goes into your motor from the bottom end,the spring closes at top end rpm so as not to dump oil shit in when ur at full load,if so u might detonate,it only opens at idle or under 2000 rpm or so.Id say your setup has no spring in it right?

you wouldve removed it....?
So ur letting more crancase gas out than normal,which stink like shit,and i have seen the oil blow everywhere,on the bonent over the rocker cover,gearbox,etc,so if ur prob is a light film on everything its from ur catchcan.
If not its probably rocker cover gasket leakage down the side of the motor.
I have seen a headgasket leaking.
On my old car.
But its not likely.

 

[BobWrinkle]

Put a catch can on your VR4 and it will stink
Modify the engine and run more boost and it will really fukin stink.
[\quote]
I am running 16psi and it doesn't stink..too bad which makes me think its not working very well.

Check your dipstick isnt popping off,if it is,it means your pressurising your sump cos of ur less than optimal E-Bay catchcan.if its not then thats a good thing,but if your can is filling up every 5 days uve got excessive ring blowby,but id doubt it.
[\quote]
No neithe rof these things are happening. I have had the catch can for a month or 2 and its still almost empty.

The spring on ur PCV valve regulates the amount of oil or oil vapour that goes into your motor from the bottom end,the spring closes at top end rpm so as not to dump oil shit in when ur at full load,if so u might detonate,it only opens at idle or under 2000 rpm or so.Id say your setup has no spring in it right?

you wouldve removed it....?
So ur letting more crancase gas out than normal,which stink like shit,and i have seen the oil blow everywhere,on the bonent over the rocker cover,gearbox,etc,so if ur prob is a light film on everything its from ur catchcan.
[\quote]
Where is this spring you talk about?

All i did was take the hoses off the intake pipe and manifold and put them on the catch can. Musical hoses thats it.

If not its probably rocker cover gasket leakage down the side of the motor.
I have seen a headgasket leaking.
On my old car.
But its not likely.

Will degrease and look out for rocker cover/head gasket leaks.

Cheers

 

[maccavr4]

do a comp test bob

that will cancell a big part of the eqasion out

you give it a hard time too dont you lol

 

[boost_lover]

i had my dip stick popping out everytime i gave it a hit, but in saying what i am about to say is no means the same.

My problem was that i melted my pistons, and there fore f@#ked up my rings all because my vacuum hose on the actuator of the turbo came off and i was running unlimited psi.

Air was passing by the piston and into the bottom end.

do as maccavr4, get a comp test, and then go from there.

 

[3 pebbles]

My dipstick was popping out and heaps and heaps of blow by = broken ring lands on all pistons .

 

[GSRSOL]

If all this stuff has appeared AFTER installing your catch can, why dont you just take the catch can out of the equation, put the stock hoses back on and see if that fixes anything?

 

[BobWrinkle]

150 exactly in all cylinders. That seems fine to me.

And yeah macca I wouldn't say I am kind except that I always warm it up and cool it down.

I really don't want to put the stock piping on because it would be a pain in the ass :S

What is the chance of a standalone ecu fixing the problem?

 

[matress]

i dont see how a standalone ecu will fix the problem...

 

[EVO-00X]

From Road Race Engineering: http://www.roadraceengineering.com/instructions/catchcaninstructions.htm

And from a DSM forum:

PCV valve re-route

--------------------------------------------------------------------------------

The PCV (pressure crankcase relieve) valve is what screws into the left, rear side of your valve cover. It's purpose is to relieve excess crank case pressure (aka: blow by) via a hose, into the intake manifold. Not only is this route unecessary, it is messy and over time, this valve can become clogged which will cause your oil dipstick to pop out, or like me, may cause you to smoke a bit under boost. So I will give you a few simple alternatives to bypass the stock route of the PCV valve.

Option 1 (recommended)

Parts needed:

1- 2' or 3' section of rubber vacuum/fuel line (I believe its either 3/16" or 5/16", but just to be sure, take your PCV valve with you and test fit the tubing)

1- Oil catch can with two inlets

OPTIONAL 1-new PCV valve

First begin by unscrewing the PCV valve from the valve cover. Proceed by removing the reroute line from the intake manifold and remove the PCV valve and line from the car. Disconnect the line from the PCV and set the line aside (your not done with it). I would recommend cleaning the PCV valve with solvent or brake fluid. I did this with mine and removed alot of gunk from the inside. If you do, notice that when you pour liquid into the smaller side (valve cover screw in side) that liquid will flow all the way through. Now try the larger side (line side), notice liquid does not come through? That is how your PCV valve is supposed to work. :thumb: When I first began cleaning, liquid came out neither side

After your done cleaning, go get your PCV reroute line where you left it. It should be an "S" shape, and cut it in half so it looks like an "L". Make sure you take the side that comes off the intake manifold nipple. It is larger on that side and youll cuss a storm when your trying to fit the smaller portion of the line on the intake mani. nipple. Take a bolt laying around and jam it in the smaller opening nice and tight (use sealant if desired). Then place the hose back on the nipple, this is your seal for that nipple. You can always use a nipple cap if you have them, but I did not so I just did this and it works fine.

Now take your rubber vacuum/fuel line and place that on your PCV valve. Screw the PCV valve back on the valve cover and route that line to your oil catch can. While your at it, route the line comming from the left side valve cover nipple to your catch can as well. Now no more messy IC pipes.

Option 2

Follow the above steps, except simply route the tube down to the ground instead of a catch can. Keep in mind you may not get away with this at the track and the emissions peoples may not think to highly of you. So do it this way at your own risk.

________________________________________________________

I have been informed that the PCV valve opens under vacuum only. To resolve this, go to a local plumbing/hardware store, pick up a nippled barb that is match threaded and will screw into the back of the valve cover and run the line from that instead of your PVC valve.

 

[JAP63]

________________________________________________________

I have been informed that the PCV valve opens under vacuum only. To resolve this, go to a local plumbing/hardware store, pick up a nippled barb that is match threaded and will screw into the back of the valve cover and run the line from that instead of your PVC valve.

I think its meant to only open then...To stop oil vapour entering at high rpm.

Correct.?

But with the catchcan u'd want it open all the time....right?

 

[SIVART]

I have had the same problem but my dipstick only pops alittle after a drive and Im not getting any oil in my catch can

but I never get any oil over the engine at all and compression was 160,162,160,162

could a oil leak on the sump cause any probs too, and the other line is connected to the air intake pipe to the turbo