Quote:
Originally Posted by SoguRacing
that still doesn't explain the pcv valve function under boost. sil85, blow by is when combustion chamber gasses blow by the rings into the crankcase..not the other way around. still doesn't explain oil consumption for an untuned car.
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If the car wasnt tuned and it cracked a ring land it would consume oil like crazy.
That simple,
I don't understand what you are debating with me? lol
PCV Valve fucntion under boost is to CLOSE itself and not allow pressure into the head and crank case. The PCV valve is on the intake manifold side of the SR valve cover.
The crank case vent is something different. That is the hose coming up on the exhaust side of the sr motor and connecting to a catch can and then the valve cover T and then the Intake Pipe in front of the turbo.
If this is not connected properly and the car is not tuned properly (ie it is bogging and under a lot of stress and wierd load conditions) you will see a bit more burn off from funky pressure zones in the crank case. It is really simple, when a motor is running very rich or has wierd very sporadic load due to very bad tuning on the motor you will get wierd load cells being hit in the map in the computer and the engine will be put under a very sporadic and random load events which in theory could cause more stress and more wierd pressure or vacuum surges in the crank case, rather than a motor running 100% smooth with stoich off boost map with no fuel leaking by rings an with perfect crank case equilibrium and steady load conditions in all gears (with no wierd surges or rough tough load patches)...
I actually had this happen when I first started tuning a haltech once. Once we got the motor running good it stopped eating through a quart of oil (tired bottom end on a customers car) and then finally once we re-cired the crank vent it was totally gone. was eating a quart of oil every couple of weeks and you could see the burnoff on the dyno when the car would hit funky load regions or wierd tractive effort load cell zones where it wasnt tuned right, you could actually see more burnoff sneaking through the crank vent t intersection
You must have the vacuum hooked up to your crank case VENT, not your PCV. PCV is almost irrelevant in this case. As long as it is working condition of course