So this is where i need get my feet wet, lol.
I recently bought a RX8 with problems from neglect. Now i know that scares the most of you but i am a biker hand have dealt with more engines than i have had hot dinners and i feel this information needs be out their on the internet.
The rotary engine seems to be damaged particularly by lean conditions.
The list for these conditions is very long as this engine has very little parts internal to it but in fact they are all external and the internals are actually quite sensitive.
Any solenoid (thats a rotary solenoid, very different to ordinary solenoids for potato engines) are critical. The 3 valves which are controlled by vacuum for two of them and a motor for the third are critical for operation.
The front so called O2 sensor is NOT an O2 sensor but and AF sensor which is in fact two O2 sensors back to back measuring a wide band fuel mixture. The rear O2 sensor which most Diag tool read is in fact the one stuck in the middle of the cat.
Do not rely on these readings from this sensor it is a after cat deal.
you have 3 ports that affect fuel trim on this engine and the downstream O2 sensor wont help you. AFR readings are what you need seen as this engine uses wideband sensors. If you have a engine issue and you keep running the engine you will destroy your engine diagnosing it as many garages do and also as many MOT stations are guilty for destroying this engine. These procedures are wrong, very wrong.
The engine is a simple pump burn and out engine like a 2 stroke motor so two stroke oil in the tank will burn out the AF/O2 sensor which is not an O2 sensor i just said that so you know what i talking about.
The cat is one of the best CAT's out their but is not indestructible so be ware.
Getting a perfect running car through the MOT emissions is like trying to do surgery on an animal without anaesthetic. You drop it off walk away to come back to a very damaged car. Rotaries are not to be idled for long or revved at constant fixed revs(part of the MOT test).
Every MOT test damages your rotary car, simple.
As soon as you feel a rough idle have everything checked such as fuel pressure, vacuum leaks, exhaust leaks, backfires and popping(this kills apex seals but sounds cool for short time), fuel trims, sensors, vacuum solenoids and so on.
Fail to do this and the engine will suffer. I just had the MOT station screw my RX8. It has a limited slip diff and they run a standard rear break roller test, run the engine for over 40 min without a fan to cool the engine and on top of that flooded it 3 times then did a emission test which failed.
The MOT tester warped my battery cells by cranking the engine so much while trying to pump the accelerator pedal to start it, i had to tell him to stop and just try without padding the accelerator and it started.
Am I the only one who wants to kill the MOT tester?
Anyone who owns an RX8 must pay attention to all these issues immediately before it is too late. Stay and wait for your MOT never drop it off and leave and come back.
2 Stroke engines don't need a CAT so why should rotary engine?
They both have no valves, cam shafts and need cylinder pre-mix by pump or in tank...
You cant fix stupid. MOT testers are stupid.
Pinking damages these engines by the second so you need know how to detect it, marbles rattling in the housing is primary sign, check your exhaust and learn to drain old fuel.
I recently bought a RX8 with problems from neglect. Now i know that scares the most of you but i am a biker hand have dealt with more engines than i have had hot dinners and i feel this information needs be out their on the internet.
The rotary engine seems to be damaged particularly by lean conditions.
The list for these conditions is very long as this engine has very little parts internal to it but in fact they are all external and the internals are actually quite sensitive.
Any solenoid (thats a rotary solenoid, very different to ordinary solenoids for potato engines) are critical. The 3 valves which are controlled by vacuum for two of them and a motor for the third are critical for operation.
The front so called O2 sensor is NOT an O2 sensor but and AF sensor which is in fact two O2 sensors back to back measuring a wide band fuel mixture. The rear O2 sensor which most Diag tool read is in fact the one stuck in the middle of the cat.
Do not rely on these readings from this sensor it is a after cat deal.
you have 3 ports that affect fuel trim on this engine and the downstream O2 sensor wont help you. AFR readings are what you need seen as this engine uses wideband sensors. If you have a engine issue and you keep running the engine you will destroy your engine diagnosing it as many garages do and also as many MOT stations are guilty for destroying this engine. These procedures are wrong, very wrong.
The engine is a simple pump burn and out engine like a 2 stroke motor so two stroke oil in the tank will burn out the AF/O2 sensor which is not an O2 sensor i just said that so you know what i talking about.
The cat is one of the best CAT's out their but is not indestructible so be ware.
Getting a perfect running car through the MOT emissions is like trying to do surgery on an animal without anaesthetic. You drop it off walk away to come back to a very damaged car. Rotaries are not to be idled for long or revved at constant fixed revs(part of the MOT test).
Every MOT test damages your rotary car, simple.
As soon as you feel a rough idle have everything checked such as fuel pressure, vacuum leaks, exhaust leaks, backfires and popping(this kills apex seals but sounds cool for short time), fuel trims, sensors, vacuum solenoids and so on.
Fail to do this and the engine will suffer. I just had the MOT station screw my RX8. It has a limited slip diff and they run a standard rear break roller test, run the engine for over 40 min without a fan to cool the engine and on top of that flooded it 3 times then did a emission test which failed.
The MOT tester warped my battery cells by cranking the engine so much while trying to pump the accelerator pedal to start it, i had to tell him to stop and just try without padding the accelerator and it started.
Am I the only one who wants to kill the MOT tester?
Anyone who owns an RX8 must pay attention to all these issues immediately before it is too late. Stay and wait for your MOT never drop it off and leave and come back.
2 Stroke engines don't need a CAT so why should rotary engine?
They both have no valves, cam shafts and need cylinder pre-mix by pump or in tank...
You cant fix stupid. MOT testers are stupid.
Pinking damages these engines by the second so you need know how to detect it, marbles rattling in the housing is primary sign, check your exhaust and learn to drain old fuel.
So i need get my feet wet...
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