36 replies to this topic

[dumfunk]

ok, i know some will say this has been done and i should look for it, but i have tried and not found the info i require....

i need a catch tank for my tubby.... i have quite a lot of oil coming out of my air filter....

i dont want to spend a stupid amount for a pro alloy or forge one.... as long as it does the job it s good by me..

now,,,,the ones i've seen have 2 pipes,some have 2 pipes and a baby air filter... do i vent it out of the car with just a pipe, do i fit the baby air filter to one of the pipes ??? i know i need to blank off the air intake pipe entry, but if there are 2 pipes on the catch tank, one is for the rocker cover vent and the other is to go to the intake, but i dont want it venting back to the intake do i? can i put a filter on that exit pipe or just vent it out of the car? will it suck back any crap??

also what size pipes do i need?

i have these in mind, but i dont know which will be best...

 

http://www.ebay.co.u...=STRK:MEBIDX:IT

 

http://www.ebay.co.u...=STRK:MEBIDX:IT

 

http://www.ebay.co.u...=STRK:MEBIDX:IT

 

any help in this department would be much appretiated.....

[Ormes]

Sorry this doesn't directly answer your question and if this question isn't welcome, but I'd be concerned if I was losing a great deal of oil through my air filter!  What is the root cause?

[dumfunk]

i dont know the route cause. Liam at MMG noticed it a few months ago, did a compression test and all was fine. He wasnt that alarmed about it said i needed to fit a catch tank. as for the amount of oil coming out i dont actually know, i may be seeing a build up from a long time. some say its a normal occurrance, some think there is a problem. items i've read sudgest its fairly normal, more so on a turbo running higher than stock pressures. also its got 85k miles, which other articles would sugest is making it more prone to it, and the amount of commercially availible tanks out there would also lean towards it being a natural occurance. when i get one i'll be able to measure how much is being expelled over a set period of time and then ask if it is cause for concern if its an abnormaly large amount.

i will however get off my rear end in a few mins and measure my pipes.

 

[dumfunk]

have measured pipes and they're 19mm id.....

 

[siztenboots]

mbes2 will be along in a minute with some good* news *or very bad

[dumfunk]

any news is welcome, as long as its constructive, and if it guides me to a problem then i really dont mind bad news.

[mbes2]

Oil from the head breather pipe return is not great (depending on how much) for a test you can 

run the current pipe to a coke bottle, at least you will see how much is coming out the engine.

 

Do you have the compression test output?

 

I filled up half a bottle in 2 laps on track, turned out to be a blown piston oil ring.

 

Met another owner at the car limits event yesterday who had same problem as mine needing a engine rebuild, his map was to lean and his piston looked the same as mine.

 

Block the air intake pipe hole with something for now (rubber bung etc)

 

Pipe size bigger the better, 19mm +...  I now just run the outlet to a filter, on track sometimes spot the pipe breathing but mostly nothing these days.

 

Mine was due to crack in the piston ring but I believe worn Valve stem seals can cause this too (also had a few of mine replaced)

 

85k is not too high but does depend on the life it had getting to there.

 

I would also suspect you will be having blue smoke from the exhaust if your burning oil.

 

You could just be seeing the effect and not spotted the cause 

 

Those catch tanks listed are fine but I found problems finding somewhere to fit it after installing the PA chargecooler exp tank.

Edited by mbes2, 20 October 2014 - 10:03 AM.

[dumfunk]

thanks for that mbes2.i do have to say the only blue smoke ive seen is when pulling away from a junction on the initial release the clutch and rev drop there is a slight puff of blue, but this seems to clear as the engine gets to temp and it doesnt smoke on hard throttle.

liam did a compression test when i was there last and it was noticed and he said it was fine, thats when he sugested the catch tank(and not one of his own,so not touting for extra spending with him) how do you check if the valve stem seals are worn, stripping down or would that show in the compression test?

 

[mbes2]

Bad valve seals will show themselves during prolonged idling at stop signs or traffic lights in congested city conditions. When the vehicle sits at idle for prolonged periods, high levels of vacuum at the intake manifold result because the throttle valve remains closed. The high vacuum attracts oil in the heads to congregate around the valve stems. Upon acceleration, the oil gets sucked past the eroding seal and down through the valve guide, where it burns in the exhaust. Huge clouds of blue-white smoke exit the tailpipe after each acceleration from a stop. The burning smoke will disappear during cruising or highway speed.

 

Evidence of valve seals being compromised will show up during off-throttle braking, especially when descending a steep downgrade where the accelerator pedal remains static. With the creation of high intake manifold vacuum, coupled with the downward slant of the engine, oil collects toward the front of the valve cover over the head. Upon pushing the accelerator after a long coast, burnt oil will exit the tailpipe in copious amounts. The engine will continue to burn the oil longer in this case, but it will still be a temporary condition until finally the smoking stops under normal cruise.

 

Oil Consumption

Bad valve seals will cause excessive oil consumption. In an otherwise normal engine with good compression, rings and valve guides, bad seals will cause a loss of oil that can be detected on the oil dipstick. By keeping an accurate record of oil level on the dipstick, a noticeable oil reduction due to the oil being burnt along with the fuel will be discovered. Bad seals will be confirmed if no oil leaks can be found on the engine to account for the loss.

 

Excessive Smoke

If the valve seals have deteriorated enough, the blue-white exhaust smoke will last longer after start-up and acceleration. Yet the smoke will eventually disappear after long engine operation or during periods of hot weather. Bad valve seals nearly always show an intermittent problem of oil burning, whereas worn piston rings and valve guides will smoke during all times of engine operation and never disappear.

[dumfunk]

ok, so from that i could jump to the fault being valve stem seals as your descrption seems to fit the symptoms, bugger........

thats an expense i really dont have the funds for, i assume its a top end strip down?

 

[mbes2]

yep, but most older high mileage cars do this and shouldnt do much harm short term 

 

I had mine replaced 2009 and some early 2014... 

Edited by mbes2, 20 October 2014 - 11:29 AM.

[dumfunk]

is 85k considered high enough to do this?

[mbes2]

Mine had 30k when it needed them, then 58k.... 

 

So depends on its life, parts wear quicker now I track it more but its part of the fun 

[siztenboots]

you don't have to take the head off to replace them, it can be done in situ

[mbes2]

Image from google

 

[dumfunk]

I dont track mine but it is driven quite hard depending on conditions etc...

[mbes2]

Keep this thread updated with your finding Good luck

[dumfunk]

will do, got a blanking plug coming and going to vent the breather into a bottle while i get the catch tank sorted.will see how much is coming out.will clean the air filter and maf and hopefully things will improve.

[siztenboots]

take a video showing how much it is pushing out the return pipe to the intake

[mbes2]

Example