LE5 to LSJ manifold threads and PCV port - Cobalt SS Network



2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque
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Old 05-14-2018, 01:23 PM   #1  
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LE5 to LSJ manifold threads and PCV port

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.


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Old 05-14-2018, 01:35 PM   #2  
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Not gonna show the part of the head that you machined?
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Old 05-14-2018, 01:42 PM   #3  
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When I take the manifold back off I will take some pics.
I take it no one has bothered to do this?
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Old 05-14-2018, 01:56 PM   #4  
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They have
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Old 05-14-2018, 01:57 PM   #5  
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Ok... no need to post pics then. Haven't seen it done. I could barely find any good pics of the LSJ port to see if there was casting in the way.
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Old 05-14-2018, 02:13 PM   #6  
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I used a dremel to grind out a path in the intake manifold flange but I am interested to see how yours looks.
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Old 05-14-2018, 04:13 PM   #7  
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Quote:
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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?
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Old 05-14-2018, 04:19 PM   #8  
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the latter
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Old 05-14-2018, 04:39 PM   #9  
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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?
Are you still using a catch can?
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Old 05-14-2018, 07:59 PM   #10  
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Not gonna show the part of the head that you machined?

Pic without flash looked like a black spot. Flash shows the casting and threaded hole boss.


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Old 05-15-2018, 06:38 AM   #11  
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Are you still using a catch can?

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.
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Old 05-15-2018, 10:04 AM   #12  
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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.
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Old 05-15-2018, 05:59 PM   #13  
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Pic without flash looked like a black spot. Flash shows the casting and threaded hole boss.


So thats just pcv dead space behind the intake flange? Good to know.
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Old 05-15-2018, 10:03 PM   #14  
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Time to open the inlet....

I pulled the AN-6 fitting I put in the breather and at first glance it looks like I went backwards... Until you turn around the OEM fitting.







Finished what I set out to do and turned down an AN-8 fitting to press fit into a larger 13 mm opening.







I can just about fit the OEM fitting into the AN-8 opening



Last edited by HGT; 05-15-2018 at 10:10 PM.
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Old 05-16-2018, 10:44 AM   #15  
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Is that just an interference fit or are you using a sealant?
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Old 05-16-2018, 11:00 AM   #16  
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Interference with loctite sealer
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Old 05-16-2018, 02:56 PM   #17  
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OEM breather fitting VS AN-6 and AN-8


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