T04Rx-7

Im no expert, I've only rebuilt 1 motor. But I would check all the parts that stayed constant in all the failures. Stationary gears? Rotors, especially the apex seal groove clearance? You have problly already checked these but Im just tryin to help out.

I hope you figure it out man. Keep us updated.

93 R1

You still haven't told us who built the motor.

rxrotary2_7

i believe Ito did.

93FDGT3540

right now we are looking at all possabilities. Right now I would like to test the oil metering jets/sprayers to see if they are clogged. I have been racking my brain tryin to figure this out. I talked to the engine builder and he has some ideas. I will keep the thread posted once some things are investigated further.

1Revvin7

What are these ideas of his?

93FDGT3540

Things like apex seal spring pressure, injector spray patterns etc. Very preliminary

93FDGT3540

anyone have info about oil metering pump failures and oil sprayer failures and the results? Oil cooler failure or tstat failures for oil cooler?

93FDGT3540

looks like everyone is hiding. I am now putting EGT gauges in both runners before the turbo in the Exhaust manifold. Also swapping out the ECU and goin to put a timing light on it under WOT on the dyno and track the timing and see where it goes. Alsp thinking about taking off 3 ohm resitors. This has been mentioned to me and i am toying with the idea.

j9fd3s

typical oil metering failures would be stuff like: apex seals and housings wear fast, ive seen one that was great on one rotor, but the rotor with the metering failure had chips in the rotor housing chrome.



if the oil is too hot i think you're gonna see things like: failed rotor oil seals/ o rings. apex seals will be worn on the sides (not the tip so much). maybe detonation? remember oil too hot = rotor too hot. maybe some oddbal bearing wear, but i think that would show up if you really cooked it



maybe an oil temp guage would be good? racing beat recommends oil temp going into the motor should never go over 210f. they are very conservative about temps.

93FDGT3540

Ok had Steve Kan make me a test map for the PFC and while on the phone with Demitrious we checked the timing with a light and with a linear timing map ran the motor up to 7krpms in neutral. The timing was solid all the way through. it didnt jump around or move. It stayed right where the map was. So it rules out there being an issue with timing wandering or doing something funky under rpms with either interfearance or Ign amplifier causing an issue.



I am ordering a manifold from Sean at A-spectuning in chicago with 2 EGT;s 1 in each runner BEFORE the turbo. This will give me accurate EGT temps to further trouble shoot. So far the Fuel and the timing have been verified to be stable and performing properly. Also a Guy named RUSS in Florida is having a similar issue with his motor. He has a GT40R turbo with a T4 flange. So the backpressure theory doesnt seem to fit. His rear rotor seals are seeing the significant damage while my front apex seals are seeing the brunt of it. This is interesting and makes me wonder why its reversed. He has a new ported motor from Pettit Racing mine is from JR's Rotary Performance.



Russ is also seeing his crankcase getting pressurized by cumbustion pressure and like mine causing oil to spray out of the dipstick. This has happened to me on my last 2 rebuilds of the same motor. He is having his motor torn down by pettit and I am curious to see if these motors have the same issues Internally with the apex seals damage.