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Ok.. Well, again, i have to put a disclaimer as I'm no expert..
But you have to look at the reason of oil metering and why mazda would have gone extensive length to put a "jet" and vacuum lines to a intake source.
To start, we all know as rotor spins and after apex seal passes exhaust port, it start creating vaccum (expansion of combustion area) to suck in air/fuel. If you look at the position of where oil metering jets are, its just before the primary fuel injectors and intake (I think??). By this, oil is drawn easily into the chamber by vacuum created by the engine. We also know as higher the load and engine speed more oil is needed. This was one of the reasons of why Mazda has been spending money on R&D... and why Renesis had 4 oil jets instead of 2 on 13b-rew (someone told me new one has 6!). I believe that the reason for vacuum source on the jet is to provide and control oil level flow.. As more air is being sucked in thru the intake passage, it creates higher vacuum pressure, causing higher flow of oil to be injected into the engine. By not using the vacuum source for the jets, you might not gain the benefit of increase oil flow thru the jets.. I guess you could get away by premixing.. but why pre-mix and go thru more hassle when just simple vac lines could do similar job.
bottomline, I think certain things mazda did it to save money and certain things mazda did it so it will increase the life span of the engine.. In this case, we could clearily see the reason behind the jets, location of the jets, and why mazda put it. Otherwise, why would they increase the number of jets to 4 (6) on the new engine?? That's more money for them and labor they have to pay...
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