Quote:
Originally Posted by docnabimmer
Thank you Xelo for your input.
I know you have doubts about this MOD since 2019 (post #253,) did you actually do the MOD and the corrections you suggested, what were the results if you dont mind sharing?
and would you change to the PCV1124DL before measuring the vacuum. We dont use the FRAM 345.
And if indeed there is a a reduction in vacuum, would connecting the F connector to one of the rear unused ports at the back of the intake manifold be as effective?(this is the port that is used by the O2 Pilot Mod)
thank you
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No, PCV1124DL is too restrictive for the volume of airflow needed. You need to keep *at least* the diameter of the OE hoses for the blowby to be properly evacuated. Fram PCV meets the exact size of OE hoses (16mm) and is already used in engines with a displacement much larger than M54, so there are no worries regarding flow of gasses.
Secondly, you need to vent the crankcase, not the intake. Connecting F to back of intake (02pilot port) is senseless, that will make the vacuum past TB suck air after MAF, increasing the amount measured by MAF and increasing mixture adaptations.
F port is already connected to the intake by the hoses merging to brake booster.
Third, I indeed had this CCV-to-PCV modification done, as presented in previously posts. Kept OE hose size all over, exiting VC with 19mm to catch can, then 16mm from CC to Fram PCV and continuing with 16mm to vacuum distributor above intake keeping all original ports for proper distribution of vacuum to all cylinders. Kept original hose plugs for look and proper sealing.
Capped vaccum port at the back of the intake.
Then connected the F port to the oil dipstick old CCV port, but installed a one way valve between (not letting the oil being sucked into intake if something backfires; crankcase sucks filtered and *already measured* air from the intake elbow).
Car runs great, fuel trims at max +/- 2-3%, baffled catch can does its job, not able to make a definitive oil consumption assesment as not moved much on highways with these COVID restrictions.
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