Are there any professionals here that understand the operation of the oil injection system with EFI?



The oil injector nozzles have a check valve and air tube. The check valve is supposed to prevent air from "escaping" from the rotor or manifold. The other end of the air tube is connected to the throttle body. This would only allow air flow when the manifold or rotor is lower pressure than the point at the throttle plate... What function do the air tubes serve? Do they improve the spray pattern? Do they prevent siphoning oil during decel.? Is there a path from oil to air?



The picture below shows the air tubes for an S5 turbo, PN: 14-606 to 14-609, 14-616, 14-617

I've seen air tubes listed on all EFI rotaries...[attachment=40076:attachment]

 

oh boy, we figured it out once, but its weird and i was a couple of years ago.



i think its to keep a steady pressure at the injector, or across the injector. we had a car locally where the vacuum lines were hooked up in front of the turbo, so it was under vacuum all the time, and it smoked a lot. if you cap em off, they flow less oil.



if you think about it, it sorta makes sense, but its a brain teaser

 

I added some tubing to them and hooked it below the supercharger so they would see boost and vacuum. The people at Atkins said that is the way to do it.



When I rev up the engine, you can see tiny bubbles pushing up from the injectors and into the lines, then when the engine returns to idle, the bubbles and lots of oil get sucked into the injectors under vacuum.

 

the turbo and non might get a different hookup, lol, you're timing is good, i dont have an injected rotary at the moment!

 

I'm pretty sure, atleast on a S4 NA that they draw air before the throttle plate, not seeing vacume ever.

 

I forgot to add:



I'm pretty sure they are there so that the OMP actually,.. meters oil,.. and the motor doesnt "suck" oil under vacume screwing up the metering. So if the vacume is more then the ammount the OMP is feeding, air is sucked in the bleeds insted of sucking additional oil through the pump.