01Racing

For those of you that still believe it is the way to go, this is what is going through your fuel system every 12-15 hours of running time. This is mixed at 100:1 ratio. My advantage is I can take apart and clean my "fuel injection" lol carburetor and my fuel pump etc, you cant. These are pics from the carb when its apart and the residue that came out of it. We also have a couple of sticking apex seals and I bet they will be coked up too. You can say what you want etc, this is the cold hard fact of adding oil to your fuel system instead of where the factory intended it to go. If you look at the premix going in with the fuel it is crystal clear and you cant even tell its there.....................but it is.....!

Footman

iTrader: (2)

What brand/model of premix are you using? What is it's certification rating?

01Racing

Footman I have used everything on the planet from just plain 2stroke oil to redline/amsoil premix etc. Each one makes the promise of "no residue etc etc, bottom line is everytime the car starts to run worse we tear apart the carb and fuel pump, find all the build up and clean it out. There is a reason Mazda came up with oil injection instead of running through the fuel system. If i had a computer and steel braided lines I would run the oil injection as well and not dump it in my fuel. The pictures dont lie, if you look at the fuel going through the clear filler tube into the cell the fuel it is nice and clear and clean, but the end result is always the same. I just posted this because this time i finally remembered to take pics when the carb was off, the fuel pump was already reassembled and installed. I dont want to start the whole debate again because I know there all the non-belivers who know better, but this is always the same and has been since 2003 when I started with rotaries and premixing.

livelycorpse

iTrader: (1)

Do not most rx8 premixers go with a ratio more like 300:1? If so these results, while interesting are not strictly relavent to someone premixing at a ratio of 1/3 the OPs 100:1 ratio. Furthermore is it not already a known possibility that there may be some negatives (minor or major depending upon ratio and oil choose) to premixing but a more thoroughly lubed up engine is the trade off? Sorry if I am off base here this is all fairly new to me.

Footman

iTrader: (2)

I think there are both sides to it and it depends on which you want to do. There are reasons like you mentioned Mazda used the oil injection system so it doesn't go into the fuel. Then there are reasons like adding a third oil injector where they wouldn't have to if it didn't help. On one hand if you don't premix you risk premature engine failure. If you do premix like you say there is always a chance of build up and gunk in the fuel pump or clogged injectors.

Its up to the user to decide. I have decided. There are a million threads on this topic. There is a tear down photo thread of premix vs. Non premix and the benefits are also clearer demonstrated by the lack of chatter marks on the housing in the premixed one plus the overall cleanliness and lack of worn down chrome flakes.

wahkupup

iTrader: (3)

Cleaning my fuel system from time to time, VS. replacing my motor.....

I would rather clean my fuel system. But that's just me.

RXeckless

iTrader: (5)

Agree,
I run 4 to 6 oz of Idemitsu per tank @ 75 liters, each spring I use Gumout. Gumout IC is no replacement for a proper injector dismantle & cleaning and new seals, but can't hurt. The reason I premix is in most rotaries the oil injectors / omp get clogged and just don't do the job. Talk to any engine rebuilder and they will say the same thing. All in all dirty fuel injectors or shortened engine life, your choice. IMHO
I call it cheap insurance!
Mazda Approved Premix Rotary Fuel Lube :
http://www.idemitsu-usa.com/h/38/premix.htm

01Racing

Allthe engine rebuilders I know wouldnt use any oil if they had there way. RX8's go through side seals not apex seals so premix would have no affect on that lol.

spacecoast

Yet the mazdatrix web site warns:


Note! Do NOT use with ethanol or ethanol based fuels!

RXeckless

iTrader: (5)

^ Use Shell 91.... 0% ethanol. I believe the warning is for E85 not most pump gas which in Canada may contain up to 15% ethanol.

My 8 I did not premix only sometimes at the track, my 7 I premix 99% off the time. Two different animals but I still believe the 8's with higher mileage (above 60K) will benefit from premixing.

01Racing

Again everyone will do what they believe is right. Tear down your engine and or fuel system and take a look. The results are always same and "hindsight is always 20/20" lol

olddragger

iTrader: (3)

Good points---premixing is a mixed bag. I have cut back myself.
The housing and seals actually dont need that much oil. I think the cooling the oil does is more critical than the lubrication? IDK for sure--I dont think ANYONE will be able to say what to do that will be correct for all driving situations/conditions. Part of the mystery surrounding the rotary --I guess.

fyrious<>

your comparing results of 100:1 (i'm assuming you race it), to what daily drivers are using which is about 4-6oz or 400:1, like half a cup in an entire tank of gas. It is not enough to gum everything up in a short period of time, your fuel system is more likely to go due to age or poor quality gas. Also, the popular seafoam, BG44k, etc can be used to clean out the fuel system periodically.

01Racing

Lol you can dump whatever you want through the fuel system. Brake cleaner has a tough time removing all the deposits that get all through the fuel pump, carb etc. Where we have to tear down every 24 hours at 100:1 what would that make 400:1 lol. Most of you seem to be missing the point which is adding more oil to the combustion process if you deem it important is fine. I am questioning the delivery method you have chosen. It sure would have been much easier for Mazda to just premix it by adding to the fuel instead of direct injection........there must be a reason why they spent $$$$$$$ engineering it the way they did. Oh wait, maybe for emissions, fuel economy, maintenance etc lol.

fyrious<>

lol! Now that's funny. Mazda or any car company worried about maintenance, really that's where they make their big bucks. They did it because of CONSUMER LAZINESS. Lets be honest here, the RX8 is a finicky car to begin with and doesn't have the highest sales in their line up. The last thing Mazda needed was sales to be even slower because the consumer now has to read into ratios of premixing and has to spend $$$ on an oil they have to add too the gas tank to prevent the engine from failing, on top of checking the oil and topping that up once a month too.

Lets also not forget that the new series II RX8 has extra oil injectors in the combustion chamber, now too me if they already did it right in the first place meaning there is enough oil being pumped into the engine there would be no need for extra oil injectors. Obviously, something was not up to par in the first series, and being the owner of a first series i premix a bit. I'd rather pay to replace a fuel pump/filter or spark plugs then an entire engine.