Help: Rb20 Oil In Intake, Over Fill Oil Catch Can, Smalll Knock Nois

[dreadr31]

ok i did a winton drift day on the weekend,

every 15min of drift i would lose about 1L of oil into the catch can then all down the side of the car and so on

kepted toping it up so the oil levels was always was up seem to work ok

no smoke came out of the exhoust at all

then at the end of the day it was a small knock nois that seem to come from the motor, sounded like a big end

last night we pulled motor out check the berrings and they seemed to be fine

i didnt get a chance to do a compresion test

im guessing it might be piston knock or some thing

but there is no oil smoke comming out the exhoust

im running about 19psi in a old rb20 tuned to 235rwkw

befor i go pulling the head off has any one had this problem and how u fix it

any help would be good thanks

[grippy]

ok i did a winton drift day on the weekend,

every 15min of drift i would lose about 1L of oil into the catch can then all down the side of the car and so on

kepted toping it up so the oil levels was always was up seem to work ok

no smoke came out of the exhoust at all

then at the end of the day it was a small knock nois that seem to come from the motor, sounded like a big end

last night we pulled motor out check the berrings and they seemed to be fine

i didnt get a chance to do a compresion test

im guessing it might be piston knock or some thing

but there is no oil smoke comming out the exhoust

im running about 19psi in a old rb20 tuned to 235rwkw

befor i go pulling the head off has any one had this problem and how u fix it

any help would be good thanks

It's normal for a RB20DET to blow alot of oil out the breather when revved hard and cornered hard. 19psi of boost will do that.

As for your knock, you will have to do some serious listening and be sure it is a knock from the motor. The RB20 is pretty hard to kill so I doubt your engine is gone. If your engine is out take a good look at your flywheel to be sure it has not got any loose bolts and not warped.

You could be having piston slap but smoke would be evident out the xsorst. Check your belts and pulleys. If engine still in car try it in and out of gear when running to identify sound.

I have been trying to control the oil from the breather on my RB20 for years now and it still keeps blowing oil into my intake. I have tried everything, baffled catch can, oil restrictor in block, catch can return line to sump, and it still does it when I go to the track.

Good luck with your troubleshooting. Compression test all the cylinders but if no smoke you should have no problems.

If you can get a hold of a stethoscope you can hold against the block to listen for the noise and target where it is coming from.

Rgds,

Grippy

[dreadr31]

thaks grippy

yer the flywheel seems to be good and just machened, only the harmonic balancer bolt seemed to be a bit lose and the cam belt case was a bit lose

[Moodles2]

What oil do you use in your RB20 and does thicker oil help reduce the blowby? 10w50, 20w50, 10w60, 20w60 etc

[dreadr31]

10w50

[grippy]

I use the same 10w-50w but I have used 20w-50w and the same result. This is my 3rd RB20 that I track and they have all behaved the same with breather oil. Only happens when the car is cornering hard. Must be oil pickup and surge in the sump.

I am building a new engine that will have a baffled sump so we will see if that finally fixes it.

Grippy.

[dreadr31]

found the problem full melted piston and burnt out valve

[STATUS]

i reckon you killed a slug. Check your injectors i bet it will be your intermittant cylinder drop.....

[STATUS]

found the problem full melted piston and burnt out valve

shit should have read the whole thing first.

make sure you find out why it was dropping a cylinder before you thrash it again. make sure its not a injector connector as an injector intermittantly cutting out under load will melt a cylinder quick smart.

[Dan_J]

^ pics ??