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After getting in the ZZP Phenolic spacer and new bolts, it was time to drill and tap the head to the correct bolt size. This is easy enough to do and after having the correct bolts in I would recommend not to hang the manifold and supercharger off the head with the wimpy LE5 bolts.
The lower manifold support bracket (if used at all) doesn't provide the support necessary.
I also machined the head to include the LSJ hole for the PCV. I used to channel the gaskets but after putting a borescope into the head I saw the room was there to create the same opening as the LSJ rather than relying on the small 2.4 hole which if you look into isn't even open all the way.
To increase the PCV flow I also made the holes in the PCV valve 25% bigger based on a wire gauge set to help support the 20% larger displacement and then some.
To increase the PCV flow I also made the holes in the PCV valve 25% bigger based on a wire gauge set to help support the 20% larger displacement and then some.
I remember we had a big discussion on how the PCV valve functions and you insisted that the check valve wasn't just a check valve but a fine tuned active metering device. So is the check valve actually an elaborate metering device or is the flow rate metering primarily accomplished via the orifice size and the check valve is really just a simple check valve?
I remember we had a big discussion on how the PCV valve functions and you insisted that the check valve wasn't just a check valve but a fine tuned active metering device. So is the check valve actually an elaborate metering device or is the flow rate metering primarily accomplished via the orifice size and the check valve is really just a simple check valve?
I do have a catch can installed in between my valve cover and intake tract which is inline along the stock flow path though I really don't know if it does much. I just didn't want to risk getting oil in my throttle body and supercharger. So far I haven't so I haven't deleted it.
I'd like to modify my PCV system to bypass the intake manifold altogether though I don't know enough about the intricacies successfully do so. I would think you could do it with some sort of external pump that could pull whatever vacuum necessary. I just don't know the specific flow rates at different operating conditions or crank case pressures. I definitely wouldn't be comfortable boring out the orifices that meter the flow. I have read enough to know that if you have too much pull on the crank case it can lead to excessive oil consumption, at least in general, I don't know about our cars specifically.
I'd like to know more details about our PCV system. However I have yet to find a definitive resource on it.
I have a PCV vacuum tool and it was measuring slightly low. Most likely due to the 20% larger displacement and the 2 liter PCV valve. I purchased 2 new valves (only $19.00 ea.) so I will be measuring the PCV flow after installing the first modified one. Mathematically it should be within specs for the changes made. Without measuring your crankcase vacuum your guessing. You could also use a slack tube manometer which has multiple uses.
05-14-2018, 01:23 PM
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