Spitting Out The Dip Stick

[FAST-XR]

54,000kms BFMK11, it never did it on the std crossover....

I’d say because you have your breather hooked up to the dose pipe, when you back off the throttle the turbo pressurises the engine. I’d guess and say that your PCV (Positive Crankcase Ventilation) valve is stuffed… That’s my thoughts any way!

please explain, why should there be a difference in connecting the breather to the crossover, dose pipe, or under battery intake, I didnt think it mattered, its all air intake from in front of the turbo!

[seeman]

I have the exact same problem, its happened to me 3 times in the last 5 thousand kms, I dont no either, its doing my head in.

[FAST-XR]

I dont know if it will happen again, but in either case ill be putting a soft extension spring from the fuel rail to the dip stick to hold it down, maybe I did hit a bump, who knows... or maybe put in a fatter o-ring to seal it off better...

[ratter]

If it is crankcase pressure causing the problem, forcing the dip stick to remain in will cause the pressure to be releived elsewhere, possibly a gasket or a seal will blow.

[dashturbo]

Er... I agree with Kissy...

There should be a one way valve somewhere along or at either end of the 'oil breather' to stop pressure from the inlet entering the crank case..

Otherwise the boost and dose pressurizes the oil chamber and fires the dipstick out... the best thing that could happen really, better than a seal, gasket or other.

So look at the original or I can look at my FG to find the one way valve, the crank case vent is only meant to allow blow by (explosions past piston rings) and smoking oil to go back into the inlet to be re burnt then emitted out the exhaust, ironically this is to stop a pressure build up in the crankcase (chamber where the oil is circulated) Yours is not preventing over pressure but causing it.

Its also possible that the your oil breather should run before the turbo in the inlet rather than after? best to check the original setup. this way the crankcase should never get boost! Unless of course you have removed the blow off valve, which you have... hmmmm that could cause it if there is no one way valve..

the length of the hose makes no difference, and if it was a worn engine and blow by it wouldn't happen during dose; when the engine has massive vacuum, this is when blow-by goes the other way!

My recommendation;

disconnect the current oil breather from the crank case (engine) and block the hose to the manifold.

This way your manifold is sealed but the nasty emissions from the Crankcase vent to the world (bad for the enviroment, good for power). Until you can work out how to fix the problem.

Although be careful of the possibilithy of a little oil or smoke from the hole in the crankcase (under power)

Edited 26/11/09 11:45 PM by dashturbo

[FAST-XR]

doesnt the breather just go straight into the crossover with no valve? why would putting the breather into a shorter air intake change things?

I have my BOV vented to atmo, I dont think that should effect things...