Frits,
I find it difficult to get my message across in 'written only' conversations and so I tend to use 1000 words to describe even the simplest thing properly! so forgive me !
I guess you answered the question in the second part also, - I wasn't actually trying to describe swirl in the cylinder.
What I was meaning really was the 'centrifuge effect' (not swirl) caused by the curvature of the ports just before it enters the cylinder- obviously you get that in any curved duct (depending on the speed of the flow), but due to the fact that in your FOS system the opposing flows of the 'in and out' gasses would actually come in contact and the transfer flow (now in a in a vulnerable "stratified" ?? form) would be a sitting duck for being dragged into the exhaust especially the outer layers consisting of oil and petrol.
Regarding the situation in the cylinder ie in a normal Schnurle type engine, whatever flow type (either swirl or tumble) is being employed, it surely must be a confused and cramped situation! and there can be no escaping the fact that the two charges will mix!
Whereas in the OP engine, there is room for separation of the charges and even a puff of air in between them. as Neil suggested a long time ago!
So, in the case of OP, (using 'tumble flow') - Is there the possibility of a slower moving 'slug' of mixture, maintaining its integrity as it moves down the cylinder to push out the remaining exhaust gas without actually mixing with it?
And yes, my "statements/questions" could be seen as amusing of course (and I don't mind that at all) - but question is, can you see any validity in them?
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