Fitness Stain

ok ... ive got some vaccum leaks that im in the process of fixing, and while we were trying to test the car, we noticed that the oil injector lines arent dirty at all ..

i bought all new ones and some look like oil has flowed thru them and others (maybe like one or two) look just as clean as before they were installed (brand new) ...

my question is would vaccum directly affect how much oil is sucked up thru these things ... i assume they would as they have a vaccum source directly hooked to them ... im basically asking this cause im hoping my **** isnt messed up or clogged .. i doubt it as the mechanical OMP's rarely fail ...

so anyway ... any concrete help on this would be much appreciated ..
thanks

=-dustin

Fitness Stain

just noticed i mistyped the subject ... its supposed to say how much will vaccum AFFECT oil injectors ...

if mods see this please change it for me

HAILERS

The vac line on top of the oil injector does not put a vacuum on the injector. That line is a source of filtered air from a source before the throttle plates i.e no vacuum.

There is a vacuum though. It's from the intake stroke of the rotor.

It might be noted that if you block off the oil injectors your removing a source of air for the idle.

Outside of that I know not how oil injectors work. It's a mystery to me. It's been explained to me but it didn't take so to speak.

Fitness Stain

damn ... if hailers doesnt know im screwed

LongDuck

On the 1st Gen oil injectors (84SE), same as 13b 6-port engines, the oil injectors operate through vacuum port pressure, since they are a one-way valve.

As the vacuum from the 'spider' splitter is pushed/pulled against the one-way valve, it pushes a tiny bit of oil through the oriface; the one-way valve prevents it from being 'pulled' through to the spider, however. In effect this creates a pulsing squirt that goes into the intake air path.

On my 84SE, the vacuum source for the spider comes off the Dynamic Chamber which is in anti-phase to the intake port pulse - likely increasing the pressure differential and helping the 'squirting' action to work better.

FSM tests for the injector is to blow and push air, suck and not move air - this is with the vacuum line, obviously, not the oil line. HTH,

HAILERS

The last time I looked, if you take the spider *vacuum* hose off the intake nipple, and put your finger on the line FROM THE SPIDER, you will feel a suction. That suction comes from the rotor intake via the oil injector.

If you put your finger on the metal nipple that the spider feeds off, on the intake manifold, there will be no vacuum felt.

There is no vacuum being pulled FROM the direction of the intake manifold.

I'm in a rush right now. Maybe I read the post above wrong. Probably did. But do it yourself. Idle the engine. Pull the vac line for the spider off the intake manifold. Feel and you will find the vac comes FROM THE oil injectors.Later. In a rush.

NZConvertible

Hailers is right, the vacuum created in the chamber or intake manifold pulls air through the oil nozzles. I've never heard the confirmed reason for this, but the most likely theory is that it helps distribute the oil more evenly as it leaves the nozzles. So that the air entering the nozzles is both metered and filtered, they're connected by hoses to a nipple on the UIM that is fed from before the throttle via internal passages within the UIM, spacer and TB. It should be obvious which nipple on the UIM to connect the oil nozzle splitter hose to, because it's the only one big enough.

FYI, the fuel injector air bleeds work in exactly the same way.