General > General Technical Chat
Ok to pull the ozone generated in an ignition distributor trough the PCV system?
BrokenYugo:
No.
ELS122:
--- Quote from: BrokenYugo on July 26, 2023, 01:36:42 pm ---No.
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Didn't have to get into so much detail as to why...
AVGresponding:
--- Quote from: ELS122 on July 26, 2023, 01:48:52 pm ---
--- Quote from: BrokenYugo on July 26, 2023, 01:36:42 pm ---No.
--- End quote ---
Didn't have to get into so much detail as to why...
--- End quote ---
Largely because the quantities involved will be insignificantly small.
--- Quote from: Circlotron on July 25, 2023, 10:47:25 pm ---Interesting subject. Some race engines use a vacuum pump to keep the crankcase in negative pressure. Helps keep the rings from moving away from the lower ring lands as the piston decelerates at top dead centre. As for the original question, I’d say put a check valve in the line from the dizzy cap to the crankcase so no fumes can ever flow back into the cap unexpectedly. And given the amount of ozone produced would be small compared to the total airflow in the crankcase I’d say it’s not going to cause a problem. But yes, ozone is reactive. Would the antioxidants in the oil also work with ozone? Actually, does ozone support combustion? If it speeds it up while maintaining the same AFR that might be beneficial.
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This is more of a beneficial side effect; the primary reason is to reduce aerodynamic drag on the crank.
John B:
I think I see the argument here now. He's suggesting the air movement is from:
presumably post airflow meter > crankcase > intake manifold
I suggest plumbing the PCV with clear PVC for a while to see where it turns a nice shade of brown from the oil vapour. I'm also unsure of how you hope to plumb a distributor in an airtight way, but I would expect unmetered air to be entering the manifold. And lastly I would suggest there's a reason why literally noone does this.
Circlotron:
Back in 1978 the brother in law had a Suzuki LJ80 4WD and it had a distributor cap with an air inlet and outlet although I think this might have been more to do with keeping the inside of the cap dry after splashing around in wet conditions.
The issue of unmetered air entering the inlet manifold is something I hadn't thought of. The inlet to the distributor would need to be downstream of the airflow sensor as John B alludes to. And maybe a bead of silicone around the bottom edge of the cap.
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