When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I'm sure this has been covered but can't find a straight answer. I currently running the MM wild catch can on my 02 c5z that has an A&A V3 t-trim. As of right now, my "clean" line is going to the intake on the S/C and the "dirty" side is from the oil fill cap. Is this correct and if not, what's a better option? Thanks in advance.
I have an older .pdf for the Rev Extreme piece, and it looks like this is their intent for LS6 with centri.
For my LS1-based rig, it is a bit more complex and I have two one-way check valves instead of one with my CoSpeed piece. Come to think of it, they also recommended and then sent some sort of in-line restrictor for mine as well.
I have the MM pcv can. Intake manifold to can pcv, passenger valve cover to can 10 an line and ls6 valley barb to fresh air in supercharger filter. Drivers valve cover is blocked off.
I have my MM can setup as in the MM pic but I put a small filter on the valley barb for fresh air into the motor.
That sounds like a vacuum leak... Intake manifold vacuum sucks air through the can and engine, from the atmosphere, coming in that filter. Granted, not a large vacuum leak, but wouldn't it be better to run a hose from the valley barb to a fitting located downstream of the MAF sensor? Then the engine would only pull in metered air.
That sounds like a vacuum leak... Intake manifold vacuum sucks air through the can and engine, from the atmosphere, coming in that filter. Granted, not a large vacuum leak, but wouldn't it be better to run a hose from the valley barb to a fitting located downstream of the MAF sensor? Then the engine would only pull in metered air.
Wouldn't that pressurize the crankcase when it's no longer a vacuum but positive?
I think the proper way TBH would be to run the valley barb to the air filter pre-SC?
Wouldn't that pressurize the crankcase when it's no longer a vacuum but positive?
I think the proper way TBH would be to run the valley barb to the air filter pre-SC?
Well, damn... I was picturing my Subaru's setup where the MAF is upstream of the compressor. With a blow-through MAF there is no place that's both downstream of the MAF and upstream of the compressor. Moving the valley barb to the pre-SC pipe would only fix the metering problem if the MAF upstream of the fitting.
You have a point there. I was picturing my Subaru's setup where the MAF is upstream of the compressor. With a blow-through MAF there is no place that's both downstream of the MAF and upstream of the compressor.
I'm SD as are a lot of other blower guys so the MAF doesn't factor in anymore.
IIRC MM said the basic concept was to get dirty fumes out / clean air in. The driver's side valve cover should be the clean air input but mine has a grommet. I figured the valley cover barb would do for now for air intake.
There's a line from the MM catch can to the intake but it the can has a check valve on it to prevent boost from reversing the air flow.
That sounds like a vacuum leak... Intake manifold vacuum sucks air through the can and engine, from the atmosphere, coming in that filter. Granted, not a large vacuum leak, but wouldn't it be better to run a hose from the valley barb to a fitting located downstream of the MAF sensor? Then the engine would only pull in metered air.
Originally Posted by NSFW
Yeah, SD makes vacuum leaks kind of a non-issue. Maybe I shoulda kept my trap shut.
The valley cover connects to the crankcase, not the intake manifold or charge piping. There is no vacuum/boost on that port that can leak. Drawing clean air into the crank case is not drawing air into the cylinders.
Last edited by Turpid porpoise; 05-17-2018 at 06:13 AM.
a pcv system is a controlled vacuum leak when possible helps the computer to have read this air through the maf, but if boosted maf not possible and if SD no maf.
there are also times when you simply cannot or do not want to connect to the main air filter tract, so, knowing the above, a separate filter can be used.
The valley cover connects to the crankcase, not the intake manifold or charge piping. There is no vacuum/boost on that port that can leak. Drawing clean air into the crank case is not drawing air into the cylinders.
And what draws the air into the crank case? Intake manifold vacuum. So the air goes into one head (the one with the filter), through the crankcase, out the other head, and into the intake manifold... and from there, into the cylinders.
For MAF-based fueling, that'd be pulling in unmetered air - also known as a vacuum leak. But he isn't using the MAF anyway, so it's no big deal.
Last edited by NSFW; 05-18-2018 at 10:51 PM.
Reason: draw -> draws
I had my tb off last night to reroute wiring under it while putting in a new mafkess pipe and saw that there is oil entering the intake via the pcv with the current system I have. While I'm sure that's fine and no different from factory function, therein is the frustration... No difference from factory function. The tank is certainly not full either.
I had my tb off last night to reroute wiring under it while putting in a new mafkess pipe and saw that there is oil entering the intake via the pcv with the current system I have. While I'm sure that's fine and no different from factory function, therein is the frustration... No difference from factory function. The tank is certainly not full either.
even the best cans are not 100% efficient, and it goes down from there!
if you are looking to improve on your current situation i'd love to help!
05-15-2018, 12:33 AM
Catch Can routing on Boosted C5
