Mike@Forge
Go Kart Champion
actually i did thank you if you read a few posts back =)
I genuinely must have missed it. Very sorry.
Mike,
I understand this kit requires removal of some stock parts. Which stock parts are these, the low pressure fine oil separator (cyclone), and the high pressure separator that's near the crank case?
Also, what did you size your catch can outlet line off? Did you mimic the factory line going to the intake manifold, or the one going to the turbo inlet? I'm just trying to get an idea what kind of flow rates to expect from this thing, and how much vacuum it will pull in the crank case itself. My concern is if the outlet line is much larger than stock it will pull a hefty vacuum in the crank case / valve cover area, and might end up sucking in more oil than the stock system would. I don't know the outlet orifice size of the cyclone either, but since that's the ultimate flow restriction, if you remove it wouldn't you expect a much higher flow rate?
Thanks!!
I have covered all of this already.
The only thing this removes is the PCV assembly on the top of the valve cover. There is no PCV assembly on the block. There is a channel integrated into the block and head that allows the pressure from the lower portion of the block to come up and equalize with the pressure in the head, all within the PCV assembly. Our Africa plate retains this feature via the fan-shaped cutout on the underside of the plate.
Our tank serves as a replacement for any oil separation that was a part of the OEM PCV assembly, which had minimal effectiveness anyway, due to how much oil, fuel and water vapor that gets through the stock system back into the intake manifold and the turbo inlet. You are simply replacing one type of oil separator with another, arguably more efficient one.
The stock PCV has two hoses, but the crankcase pressure is only ever vented through one of them at any given time. It goes through the front hose to the intake manifold when the manifold is in vacuum and when the manifold sees pressure, a check valve closes and switches to the rear hose to the turbo inlet. Once you have removed the intake manifold connection, and use the turbo inlet as a dedicated vacuum source, only one outlet is needed.
The crankcase will only ever see 1-3 PSI of pressure even at wide open throttle and full boost. The turbo inlet is always under at least 2-3 inches of vacuum at idle, and more at wide open throttle, though it will vary slightly based on the intake used, so it is more than enough to actively draw out the crankcase pressure through the tank, regardless of the hose size being used. The hoses do not need to be a large diameter to vent a mere 3 PSI of crankcase pressure. We sized them sppropriately given the various constraints of the application.
The outlet fitting on our Africa plate is strategically positioned over a baffle already integrated into the valve cover that will prevent liquid oil from being picked up by the fitting and sent to the tank. If it were not positioned at this location, there may indeed be a higher chance of picking up liquid oil, but we proactively considered this very early on in the development. It will suck up no more oil than the stock system would. Perhaps even less.
The main advantage is that this setup is also removing fuel and condensation vapor that can lead to oil dilution if left within the system, and it bypasses the unnecessary intake manifold connection and minimizes the possibility for buildup on the intake valves.