Oil Blow bye - cause ??

[jezzrrr]

Been experiencing some blow bye on both my babies lately (33 &34), I suspect its because I have raised the boost and I do have catch cans on the way but can anyone tell me, technically (but not too technically), why this is happening ?

Also is there any way I can get the oil out of the FMIC etc ?

Jeremy

[wreckedhead]

take the cooler off and drain it. blow by usually happends casue of high revs, and thrashing.

drop the boost down.

[gtrken]

First sign of piston rings/pistons starting to fail or getting worn.

Can quickly deteroiate to oil mist mixing with the incoming fuel charge which degrades the octane rating causing detonation and definate piston ring/piston failure followed by hammered big ends and bent cranks.

High hp/boost on a less than perfect GTR engine can very quickly end in tears...

Pushing the boost limits /timing on stock engines without CAREFULLY monitoring knock is very risky.

have seen more than enough atm in both RB25 and RB26...

Cheers

Ken

[Gav]

Ken

sounds like you just described how I abused my old motor to a tee:

* Strap on a pair of big terbs onto a tired motor with low compression.

* Wind up the boost to compensate for low compression.

* Periodically drain the oil from the dual purpose induction air heat exchanger/oil catch vessel (aka intercooler).

* Ignore intermittent knock warning on the PFC 'cause your half way through opening a can of "woop ass" for some knuckle dragger who thinks his new Genie headers make him unbeatable.

* Continue to ignore the dull wop-wop thud that happens at a characteristic 3,000 rpm.

Bloody amazing that I only cracked a crank and spun a bearing or two. Tough things them RBs, all things considered!

[jezzrrr]

Shit - the R34 has low k's and I am only running 1.3 bar boost at max.

The R33 about the same, bit more wear and tear on the motor though