what happens if it's too rich?

 

It will fowl the plugs quicker, clog the cat quicker (if you still have one and I think that is more likely with synthetic 2cyc than with mineral based 2cyc), and since it lowers octane, can potentially cause pre-detonation. Also, just a guesstimate, but you may also lose some HP with a too oil-rich mixture on a street driven car.

Remember, the OMP on our cars can only provide up to a minimum (oil-rich) mixture of 150:1 and generally never reach that spot most of the time.

 

OK thanks for the data. I started using MMO couple of days ago, in addition to the normal 10W30 oil my omp injects. Tried 6 oz in 8 gallons, did seem to run smoother. Today i filled up the tank and put an oz per gallon (10 gallons, 10 oz). Only drove for about a mile after that, but I could swear it was running even smoother. Definitely no loss of power. No perceivable smoke. Only one thing. It was backfiring more than usual. Normally once it's fully warmed up it practically doesn't backfire. After pulling off from the gas station it felt a bit like when I accelerate hard and let go of the accelerator before the car is fully warmed up.

 

<ray green> Yes. still have the OMP hooked-up. The rod is in the upright position so the pump is dead in the water. If 1oz per gallon is to rich, how much should I be dumping in???? I did a search and read that one person was dumping 1oz per gallon... Should I just dump 8 oz for each fill-up? The car hardly smokes... only @ start-up, but not always. Also, oil pressure is always at 60

 

<alien rx7> How much oil should I pre-mix? I do have the cats on, but I am removing them on Thursday. I just installed new plugs and wires the other day and a new fuel filter as welll. I dont want to ruin "new" parts - I may be mixing to rich then. What do you suggest? Remember, no cats and its a turbo II. OMP hooked-up but DOES NOT work.

 

<jtm7878> I went back and did the math. Since there are 128oz per gal, then 1oz of oil per gallon of gas is a 128:1 mixture. Since the OMP only gets down to a 150:1 mixture, it is a little rich.

It would be quite a bit rich if you were running that on top of a working OMP. If my math is right, the OMP is working on the rotary, and it is hitting the 150 mark a majority of the time, then your mixture would be...69.1:1! Which is 1.85 oz of oil per gallon of gas. So one can see why it is not recommended to pre-mix with a working OMP.

So, I am going back on what I stated above about it being too rich. On your application, I see no need to worry. In fact, since it is a boosted engine, this is most likely better for it though I would not run a richer mixture than that since again, adding oil to the gas does drop the octane rating. For your engine, stick with the 93/94 octane with 1oz per gallon and since you're OMP is not working, get a blockoff plate for it.

*all calculations done assuming the use of TC-3w 2-cycle oil.

 

The OMP is hooked-up, but it does not work. I use 93-94 octane always. The OMP does not inject any oil whatsoever - So, I am depending on the OIL within the fuel to keep the apex(?) seals lubricated

 

Someone posted a quote on the subject and it says that the OMP is capable of a minimum output of 150:1. My question is if this is true with the OMP at idle. In other words if this is the output with the linkage to the carb disconected. The reason for my question is that today i am getting my 85 stock 12a with a dellorto carb on it. the mechanic said that the OMP would be conected as far as the oil lines but the linkage to the carb would not. Just trying to figure out how much oil to add to the tank now with this new set up. My mechanic races rx7 and the funny thing is that he told me not to worry about it which is contrary to what i have read here.

david

 

DRY GAS OKAY WITH PREMIXING? I AM RUNNING A 1988 TII TURBO. OMP IS DISABLED. NO CATS. ALSO, OKAY TO ADD OCTANE BOOST ON THIS SETUP? I AM USING 93-94 OCTANE 1 OZ OIL TCD-3 PER 1 GALL GAS. I WANT TO KNOW IF DRY-GAS IS SAFE? FOR THE WINTER

 

No, if the linkage is not connected you're not going to get that much, if any, oil to the mixture.

Even in the book, to test the OMP to see if it is working, you have to run the engine at 2k rpm for six minutes and the amount of oil discharged from both OMP tubes should be a total of 2.2cc!

Also, I mentioned that the OMP is capable of up to a minimum (oil-rich) mixture of 150:1. The actual stock setting for it from factory is 250:1 which comes out to about 1qt. of oil consumed every 2000 miles under normal driving conditions and pedal to the metal would be about 1000 miles per quart consumed.

 

Interesting. So my mixture for a turbo II, 1 oz TCW-3 oil per 1 gallon of gasoline (94 octane) is fine for my car, knowing the OMP is disabled? Would anyone agree?

 

Will Premixing affect emissions? I will disable the omp so the only oil being injected will be the premix? Will this make me run dirtier, cleaner or same?

 

Honestly, I think the car runs better. I had to put in new spark plugs, wires, fuel filter (*) People seem to forget about the fuel filter. I run 93+ octane always and last night added RESTORE FUEL INJECTOR (@ 1/4 tank gas) it ran even better. I dont know about emissions. Do u have your cats still? If so, I HIGHLY doubt it will effect emissions, but I would search more on this.

I have no cats and run 1 oz per gallon. If I dump $15.00 worth of gas @ 1.78 = 8.426 gallons - I will add about 7 oz of TCW-3 certified 2-stroke motor oil

 

Hmm, yeah, I would be running the cats or at least the main cat.

 

<RotaryRevn> It honesly should have no effect with one cat (main) - I am new to pre-mixing - I only see smoke @ start-up and that's on the very cold days - never see smoke during wide-open throttle etc.

 

same here.

 

one ounce of premix per gallon of gas is what we run @ the racetrack! too much premix for street stuff.

go half an ounce per gallon of gas.

 

thanks, I'm gonna try to pass CA emissions with just a main cat and airpump pumping in straight to the cat, no egr or acv and a smog friendly tuned Microtech. I just gotta get lucky with the visual though. Last time I got smogged it didn't seem like they even knew what they were lookinng at, they just wanted to see the numbers

 

<DRIVE FAST 7>1/2 oz per gallon? Hmmm... even on a turbocharged RX7????

 

I guess everyone has an opinion of what to mix etc. I've been dumping 1 oz per gallon and its been fine, but it also has been perhaps 1 month. I found on this club some think its funny to give ****-poor tips, like removing your cats and failing to mention that FLAMES shoot out your exhaust pipes. I just hope the advice people lend are true. My car blows up, heads are going to roll!!

 

I've been adding 8 oz. MMO per fillup (about 10 gallons) but my OMP is still working, so I think I'll cut back to 4 oz.

B

 

I started doing the same couple of weeks ago with OMP working as well, and I've just cut back to 4 oz as well.

 

Yes, but your OMP's are working. Mine is dead, it went to RX7 heaven. So, premixing at 1 oz per gallon I thought was correct.
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Someone posted I should run one main cat or was that directed to someone else? I have no cats.

 

The blue83 has stumbled when starting and run rough a few secs, which I figured was because I'm losing coolant, probably thru the header Orings. But maybe it's fouled plugs from the MMO. It'll prolly be spring before I pull that header, so maybe reduced MMO will help.

B

 

I just wondering.. you fill up your tank and you add what ever amount of oil. next fill up theres still going to be left overs in the tank..so when you add more gas and oil are you increaseing the oil to gas ratio? So that means that you will have to add according to the amout of gas you put in

(just makeing sure)