Afterburner.. i have to disagree with you on the whole fresh air thing..
First of all, its a one way valve... If you tried to blow air in, air does not go in. So, having filter or clean air is pointless. If it was where air is being sucked into the nipple then I could say you make sense.. But as I made a point earlier that I've seen bad oil jets that blow both directions.. which means they are bad.
Second, there was a SAE article about the 99 oil jet vs older... Let me see if I could find that info:
Quote:
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Apex seal lubrication has become a critical issue. In a race engine, oil supply to the rotor housing by means of injection was precisely monitored and controlled, whereas in the production unit, a larger amount is supplied, just to be on the safe side. Some of the lubricant is fed into the trochoid chamber through a metering nozzle. The previous nozzle's oil passage was 2.0 mm (0.08 in.) in diameter. Negative pressure created in the rotor chamber would cause all the oil within the nozzle to be sucked out. When the engine accelerated rapidly, oil supply could not keep up with the speed. To prevent oil starvation, the previous system supplied a larger amount of oil to be on the safe side. In the new metering nozzle, the passage diameter has been reduced to 0.08 mm (0.003 in.), halving its volume of 0.0005 L (0.03 cu. in.). A new rubber seal is also inserted to fill a gap within the nozzle body where oil used to be sidetracked. Now, there is still some oil left within the nozzle after each suction, so that the lubrication system responds to the apex seal's requirement.
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This article points out the importance of oil metering system for rotary engine... Again, Mazda would not go to an extent to change nozzle opening if they didn't think its important.. This article also talks about the oil left in the nozzle.. which the jet/nozzle is being served as a reservoir of oil. Again, the vacuum pull of the nozzle could help faciliate the oil being filled properly during higher load on the engine.
Again, the point I'm trying to make is even slight vacuum created by intake before the turbo will help facilitate the proper working of the oil metering system. And actually thinking about it, big negative pressure would be BAD for the nozzle.. Again, putting filter or no filter doesn't matter as its one way valve... Check it yourself.. And as always, I could be COMPLETELY wrong about this as I'm no engineer... but it makes sense to me
