The role of the oil in the rotary engine..
07-11-2003 | 01:23 PM
#26
Prodigal Wankler
Joined: Nov 2002
Posts: 1,761
Likes: 2
From: Austin, TX
Originally posted by rotarygod
It has been electronic since 1989!
It has been electronic since 1989!
But seriously, were even the last of the RX-7's OBD-II compliant, and if so, did they throw a CEL if you disconnected the pump?
07-11-2003 | 01:34 PM
#27
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Joined: Apr 2003
Posts: 9,134
Likes: 25
From: Houston
Even the 2nd gen '89+ cars went into ecu default mode when the oil metering pump sent it a weird signal. This mod doesn't change the way it functions or hooks up. The computer won't see it. We are just changing the physical location that the oil is routed from not the pump itself. I doubt that the RX-7s were OBD-II compliant. Not back then but I don't see how that would be relevant to the mod. Who knows? Maybe Mazda really changed things around. I guess there's only one way to find out!
07-14-2003 | 05:48 PM
#30
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Joined: Apr 2003
Posts: 117
Likes: 3
Originally posted by rotarygod
The Renesis uses the rotor housing location but instead of just one per rotor there are now 2 per rotor. They are side by side. This location allows oil to directly touch the apex seals as they pass by. The side by side location on the Renesis enables oil to get to much more total area of the apex seals than just one can provide. This in turn lets less oil be injected into the engine since it is being used more efficiently. This is what makes the side port exhaust possible.
The Renesis uses the rotor housing location but instead of just one per rotor there are now 2 per rotor. They are side by side. This location allows oil to directly touch the apex seals as they pass by. The side by side location on the Renesis enables oil to get to much more total area of the apex seals than just one can provide. This in turn lets less oil be injected into the engine since it is being used more efficiently. This is what makes the side port exhaust possible.
07-17-2003 | 09:22 AM
#31
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Joined: Jul 2003
Posts: 114
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From: Boston, MA
Originally posted by neit_jnf
I was wondering that instead of disabling the oil-metering system and using premix, what if someone custom made a small oil tank and installed the oil metering pump there? Then it could be possible to use 5w20 non-synthetic oil in this tank while using full synthetic in the engine. If the small tank was say 1-2qt size then it would need to be refilled every 10-20k miles and since the oil was solely for metering it will never get contaminated and never need to be changed. Of course the engine oil still needs to be changed and everything. I think this would be optimal because the lubrication and oil metering system would operate as Mazda designed it. Anyone thought of this before or even did it?
I was wondering that instead of disabling the oil-metering system and using premix, what if someone custom made a small oil tank and installed the oil metering pump there? Then it could be possible to use 5w20 non-synthetic oil in this tank while using full synthetic in the engine. If the small tank was say 1-2qt size then it would need to be refilled every 10-20k miles and since the oil was solely for metering it will never get contaminated and never need to be changed. Of course the engine oil still needs to be changed and everything. I think this would be optimal because the lubrication and oil metering system would operate as Mazda designed it. Anyone thought of this before or even did it?
www.rotaryaviation.com sells a kit that you attach to the factory oil metering pump. You attach your own reservior to that piece. That way, you get fresh oil supply. Synthetic engine oil, 2 stroke oil, or marvel mystery oil works.
Maybe they will make a kit for the RX-8.
07-21-2003 | 10:58 AM
#32
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Joined: Jul 2003
Posts: 41
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From: Ocean State
Mazda, under Ford influence, is recommending 5w20 solely to make the EPA happy.
Synthetics aren't recommended by Mazda because they got screwed out of sponsorship money. It never had anything to do with carbon buildup BS. I have 100k miles on a '91 on synthetic with no problems or carbon buildup.
Owner neglect is the main reason why rotaries die. The Renesis will share the same fate as any other rotary---stupid/lazy/cheap owner = early death for rotary!
Mazda claims that the Renesis burn ~quart every 10k miles. I burn 5 quarts in the same time along with additional tcw3 premix as added insurance.
It is too much of a hassle to convert to external reservoir oil injection. Mazda would've did this if they could teach idiot owners how to pop the hood and top off fluids.
Bankruptcy is why the RX7 was discontinued. It had nothing to do with OBD2 and everything to do with taking it up the a$$.
Dirty oil will kill the oil metering pump and clog the injector/lines.
Remember this when you kill your motor because you thought that 3k changes is OK.
Synthetics aren't recommended by Mazda because they got screwed out of sponsorship money. It never had anything to do with carbon buildup BS. I have 100k miles on a '91 on synthetic with no problems or carbon buildup.
Owner neglect is the main reason why rotaries die. The Renesis will share the same fate as any other rotary---stupid/lazy/cheap owner = early death for rotary!
Mazda claims that the Renesis burn ~quart every 10k miles. I burn 5 quarts in the same time along with additional tcw3 premix as added insurance.
It is too much of a hassle to convert to external reservoir oil injection. Mazda would've did this if they could teach idiot owners how to pop the hood and top off fluids.
Bankruptcy is why the RX7 was discontinued. It had nothing to do with OBD2 and everything to do with taking it up the a$$.
Dirty oil will kill the oil metering pump and clog the injector/lines.
Remember this when you kill your motor because you thought that 3k changes is OK.
07-21-2003 | 12:07 PM
#33
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Joined: Mar 2003
Posts: 1,277
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From: Around
Originally posted by deadrx7conv
It is too much of a hassle to convert to external reservoir oil injection. Mazda would've did this if they could teach idiot owners how to pop the hood and top off fluids.
It is too much of a hassle to convert to external reservoir oil injection. Mazda would've did this if they could teach idiot owners how to pop the hood and top off fluids.
07-21-2003 | 12:11 PM
#34
Prodigal Wankler
Joined: Nov 2002
Posts: 1,761
Likes: 2
From: Austin, TX
Originally posted by deadrx7conv
Dirty oil will kill the oil metering pump and clog the injector/lines.
Remember this when you kill your motor because you thought that 3k changes is OK.
Dirty oil will kill the oil metering pump and clog the injector/lines.
Remember this when you kill your motor because you thought that 3k changes is OK.
07-21-2003 | 03:48 PM
#36
Registered User
Joined: Jul 2003
Posts: 2
Likes: 0
From: Jacksonville, FL
If you wanted to know for sure if 3k was to long for an oil change you could pull samples at 2k & 3k, after break in. That would take the guess work out of it. I work on ammonia compressors and we use them to tell when a unit is getting close to needing a oil change or a rebuild.
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