whitebeau
02-07-2008, 02:06 AM
I don't think this has been covered.
I got a new engine due to the side seal on the 2nd (rear most) rotor failing. My 2004 8 was purchased with 65k miles on it, so likely hood is who knows what the previous owner did for maintanance.
I ran 5w30 Royal Purple at the time of pickup, and the engine failure just recently occurred, or signs of failure I guess started Mid December 72k. (long starts on cold, bellowing white smoke for 30 seconds, CEL light due to 2nd rotor mis-fire). After changing he plugs, and getting a new battery, I dropped it off since the above symptoms never cleared up, it was just able to startup without issue, also i noticed water coolant consumption increased drastically needing to be topped off within 2 weeks of the coolant light coming on.
So to the theory:
The omp manages 2 injectors that are designed to lube the side seals on the rotors right? (Crap cant' find the white paper by Mazda in one of the threads that linked to it.)
So would going to a heavier oil (5w3 0) cause issues, especially in the upper rpm band since the heavier oil would have a thicker viscosity as temp increases in ratio to rpm increase. I know the OMP is suppose to increase flow in a matched ratio to rpm's.
I'm trying to reason why the sideseal would fail, this seems to be a pretty common occurance, but since Mazda N.A. requires engines to be sent back for diagnosis, there isn't a solid database publicly available to track the failures.... unless you happen to be working at the rebuild facility on the East Coast.
I'm sure other failures like apex seals, or the o-ring on rotor itself failing, hell since these rotors are pressure cast i'm sure some have probably cracked under the high rpm tolerance. It just sucks, and also in MNAO smart move to keep failures under lock and key.
Thoughts?
yes i've read the sticky wickies.
though not on the rx-7 board :)
I got a new engine due to the side seal on the 2nd (rear most) rotor failing. My 2004 8 was purchased with 65k miles on it, so likely hood is who knows what the previous owner did for maintanance.
I ran 5w30 Royal Purple at the time of pickup, and the engine failure just recently occurred, or signs of failure I guess started Mid December 72k. (long starts on cold, bellowing white smoke for 30 seconds, CEL light due to 2nd rotor mis-fire). After changing he plugs, and getting a new battery, I dropped it off since the above symptoms never cleared up, it was just able to startup without issue, also i noticed water coolant consumption increased drastically needing to be topped off within 2 weeks of the coolant light coming on.
So to the theory:
The omp manages 2 injectors that are designed to lube the side seals on the rotors right? (Crap cant' find the white paper by Mazda in one of the threads that linked to it.)
So would going to a heavier oil (5w3 0) cause issues, especially in the upper rpm band since the heavier oil would have a thicker viscosity as temp increases in ratio to rpm increase. I know the OMP is suppose to increase flow in a matched ratio to rpm's.
I'm trying to reason why the sideseal would fail, this seems to be a pretty common occurance, but since Mazda N.A. requires engines to be sent back for diagnosis, there isn't a solid database publicly available to track the failures.... unless you happen to be working at the rebuild facility on the East Coast.
I'm sure other failures like apex seals, or the o-ring on rotor itself failing, hell since these rotors are pressure cast i'm sure some have probably cracked under the high rpm tolerance. It just sucks, and also in MNAO smart move to keep failures under lock and key.
Thoughts?
yes i've read the sticky wickies.
though not on the rx-7 board :)