- Posts
- 11,020
- Location
- North of the Wall
My engine rebuild is burning oil and it looks like most of it is going through the intercooler.
Anyway, it's got me thinking about the pressures in the air intake, rocker box etc.
I'm getting a bit of pressure/chuffing out of the oil filler hole.
When the engine is running and so pulling air through the air filter and through the intake pipe to turbo, this must also be pulling on the pipe from the cyclone breather? So, this must mean there is negative pressure through the cyclone. How do I feel positive pressure out of the filler cap? There must be a greater pressure differential in the rocker cover than is pulling through the cyclone. Presumably, when the turbo spools up, it's be sucking harder through the cyclone? There must be a reasonable amount of resistance caused by the air filter, so once the turbo is pulling hard might it be pulling more air through the cyclone than through the air filter? I Haven't had cause to contemplate this before. @Brown mentioned a valve in the TD5 breather pipe, but I'm sure the 300Tdi doesn't have one. What does this valve do?
Anyway, it's got me thinking about the pressures in the air intake, rocker box etc.
I'm getting a bit of pressure/chuffing out of the oil filler hole.
When the engine is running and so pulling air through the air filter and through the intake pipe to turbo, this must also be pulling on the pipe from the cyclone breather? So, this must mean there is negative pressure through the cyclone. How do I feel positive pressure out of the filler cap? There must be a greater pressure differential in the rocker cover than is pulling through the cyclone. Presumably, when the turbo spools up, it's be sucking harder through the cyclone? There must be a reasonable amount of resistance caused by the air filter, so once the turbo is pulling hard might it be pulling more air through the cyclone than through the air filter? I Haven't had cause to contemplate this before. @Brown mentioned a valve in the TD5 breather pipe, but I'm sure the 300Tdi doesn't have one. What does this valve do?