B/t the oil injectors on the intake manifold, there is a single vacuum nipple. What is its purpose in life??? The passage after the nipple, is to exit the intake manifold and split into two passages of about .040 in dia.that are in the intermediate housing. They lead to the primary fuel injectors *air bleeds*. They exit into the middle of the air bleeds almost exactly even with the bottom of the fuel injector pintles. Why??????? Again, the path is FROM the throttle body where it draws in filtered air from a quarter inch hole in front of the throttle plates, to the nipple in between the oil injectors, to a .040 hole inside the *air bleeds* for the primary injectors. And before there is a misunderstanding, the vacuum is FROM THE AIR BLEEDS, NOT FROM THE THROTTLE BODY. We know the path, just want to know why the air bleeds need filtered air from the throttle body. Thank you.

 

Bump

 

Bumpin'

 

This air bleed setup is bizarre, i admit.

However, there is an apparent need to disturb the fuel spray from the injector and reflect/dispurse it using the air bleeds.

The hole you speak of provides a "bead" of air that assists in the atomization/diffusion process.

The oil fom the oil injectors is no doubt mixed with fuel using this setup.

 

If you ran pre-mix, could you do away with this line?

 

If you ran premix, you COULD do away with the whole OMP setup from pump to injectors.

What a hassle though.

Your inviting disaster, AND you same NOTHING but the physical appearance of the engine by removing these parts.

 

Shammrock.....Maybe I am miscommunicating. The hose b/t the two oil injectors has nothing to do with the oil injectors. It just feeds filtered air from the throttle body(not vacuum) to the plastic AIR BLEEDS that the primary injectors sit in. For some reason Mazda wants to mix a little air along with the injected fuel. I've no idea why. Now its the large nipple on the back of the throttle body that supplies clean filtered air(not vacuum) to the four way spider that goes to the OIL injector nipples. If you leave the oil injectors in the housings, and leave this line off, then you are feeding unfiltered air into the engine. Not a good thing. If the injectors are removed and the injector holes pluged, you could remove the larger line at the back of the throttle body. Or if you were premixing, you could cap the air nipple on each oil injector to prevent unfiltered air going in, and then remove the large line at the back of the throttle body. Or.........

 

Hey HAILERS,

It's not your communication, it's my comprehension!:o
I just thought that the air bleeds (along with the lines to the oil injectors) primary purpose might be to add turbulence to promote air/fuel/OIL mixture in the intake charge. The fuel seems to be pretty finely attomized right out of the injectors. Wonder why the air bleeds are necessary? Is there something peculiar to the rotary that requires this?


Gregg