Because I am repairing an old harness on the FD I had to remove the inlet manifold with the throttle boddies and GREEDY elbow.

So since it was off why not re polish it. While I was taking it apart I realised that 3 out of 4 inlet tubes ( going down to the rotors ) where covered in the usual black mix of a bit of everything ( co2 , oil , combustion chamber deposits , oil return .... )

One of the 4 tubes though was very clean as if never used. This was on the engine side. So I flipped the inlet manifold upside down only to see that on the inlet manifold side 3 out of 4 tubes where covered in the greese mentioned above but one of the tubes ( the one closest to the front of the engine ) was very clean as well

I will upload some photos to demonstrate what I am writting

Also I notised that there are two small injectors on the rotors ( one for each rotor ) and both have vacum lines and oil feeds on top. So I saw that one of the two had a cracked but not completely destroyed vacum hose on . How bad is it

Never the less that car runs fine , iddle is fine and it pulls strong through all gears

Thanks for your time reading and any suggestions are welcome...

 

I read on the forum that these injector nipples need to operate under vaccum and not boost...

I saw that on my engine so some reason both nipples where connected together with a T piece but instead of vacumm the other side of the T piece was plugged into the inlet manifold

So instead of vaccum , the injectors saw boost as well . How bad is it?

 

k those "vaccum" lines connected to the OMP injectors are not meant to see boost nor vacuum... they are meant to be t'd together and connect to the primary turbo's plastic intake elbow. it is just meant for fresh intake air. the injectors should be fine even tho they where connected to the uim. however, you should do one of the two when you put this back together. either leave them completely unplugged, and vent to atmosphere (which some people have had issues with oil being sprayed on the underside of the UIM, because they were running crazy high boost with a single turbo), the other option is to route it as mazda intended.

Follow the dark blue line in the vac diagram posted. goes from the primary turbo's intake air elbow and t's to each OMP injector.

 

Would running under boost cause them to work improperly or inject more oil that needed

What I am trying to say is have I caused any problems to my engine due to the fact they saw boost as well?

 

What about the inlet tubes. Would it be normal for 3 out 4 to be covered in black greese ( what ever that is ) and the last tube to be almost clean?

Both on the engine side and manifold side. All 3 black , One clean

I will post some photos...

 

Dunno whats up with the inlet tubes on the uim with one not being as dirty as the other 3...

As far as the oil injectors, the "vacuum" line that connects to the injector does not effect the way these injectors fire at all (as in it does not control the ammt of oil the injectors fire, the OMP pump does this, IIRC these injectors run at x psi controlled by the omp pump and the injector just has a certain size hole in it which is how the ammt of oil injected is metered)...

So, the answer should be no you should not have damaged your engine. However, you should definitely not leave these connected to a source that is vacuum + boost, just run it to the oem spot when you put it back together. If the oil injectors were not injecting the proper ammt of oil into the rotor housings, this would cause excessive wear of your apex seals, and also not let the apex seal make a proper seal. So, If you are really concerned about the health of your engine, do a compression test with the engine at proper operating temperature.

 

This is a photo of the inlet manifold upside down. You can clearly see that 3 out of 4 tubes are pitch black . Any reasons why one could be suspiciously clean???

Thanks



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