Quote:
Originally Posted by mwebb
the runaway issue is not ever going to be an issue for your engine
with 1 0z per 6500miles
boost bled into crankcase is not a good idea ,
(1 bar of boost can pop out the rear crankshaft oil seal - ask me how i know that )
you could use a check valve to allow flow when boost is not present
like a
crankcase vent valve / PCV valve -
and the newer TDi dumps the oil back into the crankcase after the cyclone portion of the crankcase vent valve so no nastiness ends up wasted , it all gets sent to the combustion chamber
to be
combusted ...
so
PCV "catch can"
no engine should ever need a PCV Catch can , if yours does , that is one indication that your engine has bad piston rings or a sloppy seal at the turbo center bearing
or
the piston rings may just be frozen with carbon in the lands because the engine has been operated with
poor quality oil for many moons
(you can use VW 507 oil in that engine)
so
stop using poor quality oil ,
identify the problem (s) and repair it (them) , which will
improve your fuel economy and make the use of a PCV Catch can
UN necessary / irrelevant
having said that
i know many posters on this forum are on the balls of their butt
financially ... and have no disposable funds to be used to repair those problems ...
if that applies - a catch can is still a bad idea
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I'm actually not sending boost pressure directly to the crankcase. I bleed a VERY small metered amount of boost air from the lower intercooler downstream of the crankcase but upstream of the cyclonic separator. This bleed ensures that I have no significant amount of oil accumulation in the intercooler, and helps to aid the effectiveness of the cyclonic separator. I am getting a little more than 1 ounce per 10K miles.
The other benefit of the system is that it provides visual feedback of turbo oil seals and also the CCV oil throughput. The other benefit is that it helps reduce EGR valve clogging a small amount. I wouldn't swear to it, but my gut tells me I may have increased my mileage a small amount with the addition. I'm at 60 MPG in Florida city traffic for the last 4 tanks of 800 miles each tank-Plus it's darn cool!!