?

takes an extra 20 seconds at the gas station

 

there was another thread on this issue if you do a search, the consensus was it should have negligible effect on paper filters

 

Don't take this personally, but I'll listen to Chris and Ari over 99.999% of this forum any day

 

Having go-kart racing expierence I can say that 1:50 ratio was getting dangerous in those 2 stroke engines. 1Oz per gallon seem to be least that can be done without OMP.

I also not sure about dillution. Right way to premix would be to mix oil in 1 gallon very good and then pour this gallon while fueling up. Which does make process messy and smelly.

Just putting quart of oil into tank before fueling wouldn't do much IMO. It will take good amount of agressive driving/cornering to mix it a little.

 

again, the mix ratio for a two stroke engine application has NOTHING to do with this, other than the fact some use a similar type of oil

 

Here are some usage results from my car runing a modded OMP and external tank. The car overall with some mild cruzing and some hard running uses around 5 to 6 oz. per tankfull of gas. No premix! I suck at math, but on the high usage of 6oz I figured a ratio of 384:1 of course the omp is off at idle and decelleration I believe and really kicks it up under full boost. So inorder to cover all conditions a premix only would be much higher and in addition to the omp your safe guess is as good as mine?

 

What is the proper procedure for Premixing? Before or after the gas?

Sorry for the noob question.

 

Always before the gas. The pumping of the gas into the tank mixes it. Gas pump pump fairly quick and it really churns everything up in your tank.

 

I always fill the tank half full before adding the oil

 

I use speed bumps at 40 mph!

 

lol, that'll do it too.

 

I went ahead and called Idemitsu today (talked to a guy named Scott Shiotsu) and he said the premix fuel lube ratio was originally intended for non street cars with the OMP deleted to save weight, and also because pre-mix provides more consistent and uniform lubrication of engine internals than the OMP injection ports, which only target certain areas

he was quick to add that many racers use higher ratios, especially for high horsepower (i.e. 400-500 hp) applications, but it's not based on anything scientific

I guess my thought is, with higher horsepower applications, you are also pumping a heck of alot more fuel through the engine per given time increment, so you are effectively increasing the oil dosage

anyway, I'm sticking with 1/2 oz per gallon

 

^You do that.

I'll follow the recommendation of people from Rotary Power, Mazdatrix, Pettit Racing and Racing Beat who have been in this game for longer than my 22 years - 1 oz per Gallon when the factory OMP is not being used.

When refueling, add the premix first so that you get maximum dispersion/mixing.

I always estimate how many gallons I am going to add, add the premix, and fuel up with that many gallons. I usually don't fill my tank as the car isn't daily driven. When I'm filling up, I often wind up adding a couple of ounces after fill up if my original estimate was not sufficient.

 

I DD my car, and have never used premix. Is this something I should do in a DD? I know Rich had mentioned that he still has his OMP connectd, so I would image it is okay, but I was just wondering if there are any long term ill effects.

 

Pettit recommends that rich for racing, not for street use as far as I know, and again, it's not based on anything scientific, all speculation, I've been running 1/2 oz per gallon for almost two years and my engine is tip top, it just blows more smoke when I accelerate to clean off the rotors and plugs when I run it that fat

and before all those guys, people were running 1/2 oz per gallon, see link on previous page

wrong, you put some gas in the container, whether that is a gas tank or a 6 gallon jug, first to accelerate solubilization and improve mixing, why pour it all in first so it sits on the bottom? illogical

 

if you run the OMP you should be fine, but bear in mind four stroke oil was never intended to burn, it's really the wrong tool for the job...Mazda compromised because a separate oil chamber or pre-mix wasn't going to fly

 

b/c when you add gas you are are mixing it all up. it won't just sit there at the bottom. you go and do it how ever you like.

 

Hey all I need to know if it is recommended that I premix. I have a single turbo setup with all supporting mods and its a daily driver as well as weekend warrior.I still have the omp and it works but being a fresh rebuild at 400hp I want to be safe.

 

I looked on the rotary aviation site and I could not find this adapter. Any help?

 

wrong, you put some gas in the container, whether that is a gas tank or a 6 gallon jug, first to accelerate solubilization and improve mixing, why pour it all in first so it sits on the bottom? illogical[/QUOTE]

If you put the premix in first, you already have some gas in the tank as it will never be totally empty and thus it will already start the mixing process as you swipe you card, select your grade, etc. Then, when you are pouring gas into you tank at the rate of 2 to 3 gallons per minute (which is a pretty good flow plus the dropping action of the gas splashing and swirling into the tank). You end up getting a pretty good mix that way.

Also, thanks to the fuel return line, the tank is constantly being churned and the premix should stay well mixed.

 

Try here,

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

Terry7

 

^

Wow. Thanks! How long did it take to install yours?

 

Anyone premixing with the OMP connected? Is there a way to check to see if your OMP is functoning correctly?

 

wait, so you are adding 18ounces of two cycle in ADDITION to you OMP?

 

Redline 2-cycle race oil. Been using it for 20 years. Use it in all race cars which commonly run in 100+ air temps here, Firebird and PIR. Never had any failures. Recommend it for any client FD's before any heavy playing. Due to the fact mazda runs the OMP so lean on the FD3S.