Separate oil-injection resevoir?
 

I've seen this brought up a few times and it sounds like a great idea - a separate resevoir to feed the oil injection system. That way it gets pristine oil and could be filled with a lubricant specifically tailored to the task. Has anyone seriously considered this as a modification? Not having gotten the vehicle yet, or the service manual I am wondering how difficult it would be.

Also, what would be the proper lubricant? I am assuming some high-end 2-cycle oil but I'm wondering about viscosity and how it might affect the spray pattern for injectors that were designed for (warm) engine oil. Also, would there be drawbacks from injecting cold oil onto hot surfaces?

Of course, an in-dash resevoir level indicator would be a must, and perhaps even a kill-switch.

Most Excellent...
 

That is a righteous mod, good thinking!

It is so obvious that if the engine needs a lube injected, it should be a very good 2-stroke oil.

'Racing Beat' was doing this in the early '70s.

However, disconnecting (or fooling with) the pump on the '8 will get you a Check Engine light, and a voided warranty for sure, and is it really worth it?
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doc

Already been done -

http://www.rotaryaviation.com/oil_in...p_adaptors.htm

Dunno if they have a Renesis application yet, though. It's also hard to say what kind of benefit you'd get.

The reservoir would have to have a float or something to indicate low oil level in the cabin - could be really easy to drain the reservoir otherwise and be running dry.

It's a neat concept, but I don't see it as a practical one. It's also hard to say what you'd really get out of the bargain, not to mention the Mazda dealer would raise an eyebrow quick.

Dale

Clean, combustible, TCW3, independent reservoir.....is the best way to lubricate a rotary. Most 2stroke oils are the same viscosity as motor oil. There is no real spray pattern. More of a leak/drip. The oil injector does not work like a higher pressure fuel injector.

Screw the Mazda dealer. They do not know much anyway.

If the reservoir is large enough, all you'll have to do is top it off weekly, monthly, tankly........which depends on driving style. It shouldn't be hard to figure out by monitoring the usage. Low level indicator, like floats used in windshield washer/coolant bottles, is no big deal.

The original RX7 external versions required gravity, sump, and a block off plate. The plate will need to be fabricated for the renesis. A small electric pump can make up for gravity if the oil level isn't high enough above the MOP.
There is no need to disconnect the OMpump. All you are doing is substituting 2stroke for the motor oil, blocking off the supply of motor oil, feeding a supply of 2stroke. The ECU won't notice a thing.

Geez, reminds me of the old days and two stroke SAABS where you had to pre-mix. I think they came up with an oil reservoir too. Remember when bikes first used a separate oil injector - what a leap forward at the time.

As little oil as the rotary uses (relatively) I don't mind filling the sump. It's just another reason to check the oil level. If you had a piston-engine car over 50k miles, you'd be doing the same thing.

Benefits?
 

I think the biggest benefit of it all would be the ability to use high quality full synthetic 2-cycle oil for the reservoir and motor oil for the engine!!

but again, as a street driven car the benefits are... not huge.

it's not that it isn't a good idea, or that it wouldn't help, but at the added cost (which is really the big issue) and complexity of fudging the whole system, is it worth it??

if you think so, cool. if not *shrug*

btw, others have simply mixed 2-stroke into their tanks at fillup after disabling the oil metering system and sealing all the synthetic goodness inside the motor itself (well, with the normal drains and holes and whatnot :p).

Hey Dick you are right about the pre-mixing in the Saabs. My first car was a '67 Saab Sonnet . It had a three cylinder-two stroke engine. It was always a sight to behold (at least for other drivers) when I pulled into the local Hess station to fill up. You had to carry a five gallon gas can, put in a can of oil then fill with gas. Then you had to shake that damn thing like you were mixing a martini! Shit was that thing heavy, Then you poured the mix in the tank! Damn this brought back some serious memories!