Quote:
Originally Posted by ZL1...SON
Is there a horsepower or boost pressure at which this solution is inadequate and you recommend going to a MM wild catch can setup or similar? I purchased this upgrade from you but want to make sure it is still adequate after I have the joker race port done.
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Good Morning, Obviously there is still a ton of misinformation/misunderstandings regarding crankcase breathers and catch cans.
First you must know they are not one in the same, they are separate jobs and should be handled as such.
There are 2 sides to the PCV system and each are active depending on what the engine is doing at the moment.
And there are other factors to keep in mind, like the fact that we have a MAF in play which has to SEE all the air entering the engine either through the Air filter or through the PCV.
The PCV system is active more than 90% of the time, and is a sealed system.
This is when vacuum pulls fresh air in through our AKA breather hose, it captures all the moisture and gases that collect in the crankcase and enter through the 1 way Positive Crankcase Ventilation Valve on in to the intake track where they can be burned in the combustion process.
This is where we would introduce a
SEALED catch can on engines Not Equipped.
Our LT engine have one from the factory, The black Box.
The air that enters the Crank Case Breather hose is measured air flow by the MAF and accounted for in the fueling calculations.
When you go to full throttle or Cross the 95Kpa threshold, or the engine switches from Vacuum to Atmospheric pressure or boost, the PCV valve closes and the direction of flow changes direction in the Crankcase Breather Hose and exits in the MAF pipe where there is lower pressure than what is in the crank case which creates a pressure differential which helps ring seal.
This is also a Sealed system so the MAF can see all the air flow in to the engine.
At this point your eyes may be glazing over LOL
The amount of Crankcase breathing that is needed is direct relation to the engines ability to keep the combustion process in the cylinder and not past the rings.
There will always be a small percentage Hopefully 3-4% or less that goes by the rings, The OE breather system with the addition of the larger hose and fittings does a great job.
We are and have run it at 1300 HP because our engines have good ring seal and our tuning avoids detonation.
Detonation will unseat the rings and create excessive blow by.
In the case of detonation it is easy for the Crankcase Breather system to be overwhelmed and push out seals and ultimately oil.
There is no denying that as cylinder pressure rises, AKA increased HP, that 3-4% leak is a larger volume at higher HP Levels.
Which is the Reason we increase the size of this Breather hose in the first place.
Open Breathers should be left for pure race cars running on the edge of Detonation.
So to answer your question your system is more than adequate providing you stay out of detonation.
There is a lot more to talk about but I will leave that for another day.
Merry Christmas,
Ted.