To delete the pcv or not delete the pcv
Thread Starter
Joined: Apr 2002
Posts: 15,342
Likes: 103
From: Raleigh
To delete the pcv or not delete the pcv
So in a hunt for a good catch can I emailed Saikou Michi and asked him what the best setup would be, which he responds with
Hi!
I have heard about the smoking issue on the S2000s before. It is very prevalent during during aggressive driving and/or track sessions.
It has to do with the valve cover design. Under heavy turns, the oil will just slosh around and get pulled out of the PCV hose.
I know capping the PCV seems like a no-brainer, but that is modifying the emission routing, and eliminating the best source of vacuum for the fumes in the valve cover.
My personal recommendation would be to get a nice big single OCC, and just detour the PCV hose into that tank.
It will catch the oils, which create the smoke, and still maintain the original routing.
I'll recommend the larger S3-OCC. It would go somewhere with extra space, like the H-frame that holds the stock airbox.
The PCV will just detour into that, and then return to the intake manifold. It would be built with 3/8" OD fittings.
If I don't care about the car being road legal (about to drop the tag and insurance on it anyway) does the PCV have anything to do with engine reliability or longevity?
Hi!
I have heard about the smoking issue on the S2000s before. It is very prevalent during during aggressive driving and/or track sessions.
It has to do with the valve cover design. Under heavy turns, the oil will just slosh around and get pulled out of the PCV hose.
I know capping the PCV seems like a no-brainer, but that is modifying the emission routing, and eliminating the best source of vacuum for the fumes in the valve cover.
My personal recommendation would be to get a nice big single OCC, and just detour the PCV hose into that tank.
It will catch the oils, which create the smoke, and still maintain the original routing.
I'll recommend the larger S3-OCC. It would go somewhere with extra space, like the H-frame that holds the stock airbox.
The PCV will just detour into that, and then return to the intake manifold. It would be built with 3/8" OD fittings.
Community Organizer
Joined: Jun 2007
Posts: 31,070
Likes: 566
As mentioned in OP and in my experience trying this for a few thousand miles, the pvc is there to recycle unburnt fuel that finds its way into the crank case, vac pulls it out and into the manifold where it can be burnt and allows for the contaminants a place to go rather then continuing to collect and mix with the engine oil and more quickly deteriorating it. I notice just this, the engine oil became fumey and dark colored much quicker after bypassing the pvc system, I would not recommend doing this at all without keeping the vac source in place with a catch can, rather then venting to just atmosphere as being eluded here. More frequent oil changes would have to be a must if this was done. And I would check in with Blackstone regularly for oil analysis to understand exactly what new change intervals would need to be done, or you will no doubt shorten engine life. Also in my experience the ap2 valve cover has a better baffle design, making it less apt to have this issue. Also the largest issue in not oil coming out of the pcv side, but rather the front breather. This can easily be bypassed with no oil contamination issues. I just run a filter on mine to bypass from the intake. I run stock PCV. Never had an issue at the road course running this config on 255/295 extreme summers.
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Registered User
Joined: Mar 2003
Posts: 14
Likes: 0
From: Brevard
I ran an OCC on the car when I tracked it. Stopped the smoke issue that used to occur occasionally with hard cornering. I was amazed at the amount of oil that collected in the OCC. What collected in the can was much dirtier than what was running in the engine at the time so I would recommend an OCC over just plugging the PCV hose. Difficult part is finding a place to mount it and still being able to access it to drain the waste oil. You will see slots on the air intake housing where I had mine mounted. Don't need anything fancy just a can with two fittings to attach your hoses and a drain plug. Bonus to have the additional tube on the side to monitor the oil level in the OCC but not needed. Unfortunately, I got rid of the OCC a while ago otherwise I would send it to you.
Thread Starter
Joined: Apr 2002
Posts: 15,342
Likes: 103
From: Raleigh
I ran an OCC on the car when I tracked it. Stopped the smoke issue that used to occur occasionally with hard cornering. I was amazed at the amount of oil that collected in the OCC. What collected in the can was much dirtier than what was running in the engine at the time so I would recommend an OCC over just plugging the PCV hose. Difficult part is finding a place to mount it and still being able to access it to drain the waste oil. You will see slots on the air intake housing where I had mine mounted. Don't need anything fancy just a can with two fittings to attach your hoses and a drain plug. Bonus to have the additional tube on the side to monitor the oil level in the OCC but not needed. Unfortunately, I got rid of the OCC a while ago otherwise I would send it to you.
