Magic8

For those interested in the oil metering pump, this the message I got from the company that makes the pumps, PCV Technologies.

"Thanks for your inquiry.
I would very much like to make an adapter for the RX8 engine, however, I need to find access to a car or an engine which I have not had at this time. As soon as I have the necessary information, I will start working on it."

Here is the link to the distributor website:
http://www.rotaryaviation.com/oil_in...p_adaptors.htm


I guess the current design will not work in new Renesis.


Magic8

KWS

This will allow you to add an external oil source so you use a 2-cycle oil instead of sucking engine oil.

Hi,

yes I have, and it is in stock. The price is $ 94.00, including shipping in the US.

Richard Sohn
8029 HWY 1087
DeFuniak Springs, FL 32433
unicorn@gdsys.net

dgrx8

i'm reviving this one!!!!!!!!
anybody done something like this... seems like a great idea rather than lugging around a trunk full of 2-cycle oil for all our fillups!

Razz1

Just have Racing Beat upgrade your pump!

http://www.racingbeat.com/FRmazda4.htm

tuj

AFAIK, the RB OMP mod does not have a seperate oil reservoir, which would be very nice.

KWS

Richard Sohn
8029 HWY 1087
DeFuniak Springs, FL 32433
unicorn@gdsys.net

I never attempted the mod but I tracked him down via this web site: http://rotaryaviation.com/oil_inject...p_adaptors.htm

If you take this on, please plan on doing a DIY.

Zoom510

Yeah but then what happens when you run out of oil and toast your motor.


Now here is another question, whats wrong with the engine sucking motor oil? I use reg ol 5W30 on my RX8 but even RP or Mobil 1 are cheaper/qt than a Decent 2 stroke oil

dgrx8

awesome!
it sounds like a great DIY...
w/ all the talk about using premix in all the other threads... i'm surprised this thread hasn't blown up!

swoope

iTrader: (5)

replacing the pump will not change anything unless you change the map that controls the pump.


beers

KWS

Cool, good luck with the mod. Here's a couple of related links you might want to check out:

https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/2-stroke-oil-mod-your-metering-pump-46088/

http://www.rx7club.com/showthread.ph...=1#post3770671

demob05

For going through with the entire Mod for this separate set up, how much of a benefit is gained, as opposed to the Standard-stock engine motor oil (5W20 stuff) feeding the MOP??

yiksing

A lot can be gained, the synthetic oil debate will end and you can use oil for longer extended period instead of changing oil every 3000 miles. Secondly the engine idles and runs smoother and no more black exhaust tips. Engine life would surely increase.

PeteC

Some bold claims there just from switching the oil injection method. I'm not looking to start a flame-fest but what are you basing that on? I've got lots of experience with two stroke motorcycles and oil/oil pumps on them. Which is pretty much the same concept as the RX-8 injection pump.

The exhaust tips being black is a classic symptom of a rich running engine (fuel/air ratio). Why would simply changing from engine oil to a two stroke oil in the injector change the fuel mapping of the car?

yiksing

The way I see it, rotary engines requires an engine oil change in a shorter interval because you don't wanna inject dirty engine oil to lubricate the seals. Even if synthetic engine oil was used, it would have accumulated quite a bit of crap after a couple of thousand miles, by completely separating what gets injected into the combustion chambers (now a fresh dose of 2 stroke oil) an extended period of oil change is no longer as harmful. You can call these BS coz I have nothing to back it up but I believe what RG had told me about these or I might have misinterpret what he meant.

As for a smoother idle, it was apparent to me when I tried the premix myself but it might be just placebo effect. The lesser black exhaust could simply be cleaner combustion from the engine due to the 2 stroke oil but it might have been me cleaning the car way too frequently that time.

olddragger

iTrader: (3)

this is interesting.
olddragger

rotarygod

I have done this to my RX-7's and love it. I had a 2nd generation RX-7 that came with this adapter block when I got it. Great piece. I did the homemade conversion to my 1st generation RX-7 that is described on the 7forum and had nothing but problems with leaking. It was a pain in the butt.

As someone has already pointed out, you have less of a chance to get carbon deposits from oil in the combustion chamber as opposed to injecting motor oil. My main concern though is with the amount of crap that is in the oil. As it gets older and has more and more contaminants in it, they also go into the oil metering system. I don't like this idea.

It's not much of an issue to keep a separate reservoir filled full of 2 stroke oil. If it's large enough, just fill it when you get your oil changed. What happens if you run out? You didn't take care of your car!

SGPguy

I kinda like the looks I get at the gas station when premixing the 7, haha.

KWS

I read somewhere of someone who was able to creatively use a wave runner oil reservoir that included a low level warning light that was easy to adapt.

TRexRampage

I rigged this upgrade on my 2nd gen Rx7 back in 93. I can say from personal experience that it is worth it! My motor is still kicking and its 20 years later.

Reasons I believe the mod is better than premixing...
We all know the omp injects oil based on rpm's... the faster you go the faster the pump injects oil. The engineers of these motors tuned these pumps to deliver the correct amount of oil based rpm's... who am I to argue with them. Based on that knowledge alone by using the adaptor or moding yourself, you will be feeding the motor the correct amount of 2 stroke oil based on the omp controlled by the rpm's. I read a few post where people asked why 2 stroke and not oil from the pan... easy! Do an oil change and compare the new oil with the oil drained... need I say more?
If that isn't enough reason then do research on 2 stroke oil and your standard oil based on cumbustain. Cleaner! Less left behind in the motor to cause fouling!

For those of you who do premix this just saves you time at the pump and ensures the perfict mix. No more running to rich, or with out enough.

Another thought to keep in mind is if you do premix make sure to remove omp and plug oil injector ports. If you don't you will be over doing it.

There is also a manual adjust adaptor you can purchase for those of us that have project cars where you need to run a little richer than usual. :-) (Race application)

End of the day we all have our own habbits, but commen sense goes a long way.
BTW: I just bought my first Rx8 today and couldn't be happier. Still love my Rx7's though.

THANKS FOR POSTING THE LINK TO THE ADAPTOR.... RICH SOHN you rock! Saved me a headache and I will be purchasing one of them for my Rx8. So glad I do not have to mod myself! Love them bolt ons. :-))))))

wcs

iTrader: (2)

Thanks for contributing. (really)
But your about 6 - 10 years late to the party.
Look at the post dates.

But nevermind that...
I'm not sure how the OMP is setup on the 2nd Gen's but the OMP is not RPM based on the Renny.
The tables exposed using ATR are Calculated Load vs RPM and Throttle Position vs RPM so not just RPM.
Well at least the OMP control position for the quantity delivered at any given moment.

I would suggest reading this entire thread and enjoy how it unravels.
But here's a link to page 12 ... look for post from a dude called Delmeister.
https://www.rx8club.com/series-i-maj...120276/page12/


There is also a huge premix thread with is much like a holy war.
Likely a better place to express your opinion about pre-mixing there..

The SOHN is an awesome bolt-on.

Welcome to the club ... have fun finding out all the differences with the Rensis.

https://www.rx8club.com/new-member-f...t-here-202454/

https://www.rx8club.com/new-member-f...rx-8-a-233937/

https://www.rx8club.com/new-member-f...ot-8-a-202548/