Digi7ech

iTrader: (1)

I bought some 2 stroke oil from Chcker and an getting ready to start the car up for the first time.

I have the OMP on there but don't have the Mech TB to OMP Rod yet. What ratio do think I shoud use.

Will the OMP work at all? I'm guessing it will inject small amounts with the rod no connected.

I've heard 100:1 for blocked off OMP's and about 400:1 with a functioning one.

So maybe 200:1 or 300:1?

I plan to premix for the first week or two just as a precaution while I verify everything is working.

igottafc

iTrader: (6)

i would stick w/ 150:1 ratio to 125:1 ratio just to be on the safe side, anything past idle and the OMP wont be able to inject greater amounts of oil to compensate for the higher engine speed

rxseven

1/2 oz per gallon is what I have used in the past without issues.

86project

half oz per gallon, good call rxseven

Digi7ech

iTrader: (1)

Your probably right. 125 sounds good to me. The only side effect would be smoking if too much right?

So let's see. I generally fill it up 9-10 gallons so add around 10.25ounces? I suck at math so fix it if I'm wong.

10 gallons = 1280 ounces.
for every 150 ounces of gas use 1 ounce premix.
so 10.25 ounces. Sound right?

CRXtoRX7

yeah like 128 oz per gallon, so just do an ounce a gallon and you will be fine. I dont even measure it accurately, i say...that looks like 10 oz's....whatever.

WAYNE88N/A

I wouldn't worry about the smoking too much, Digi7ech- I'm down to an 85:1 ratio (no OMP, of course) with no problems...just make sure the premix has a TCW-3 approval for good dispersion in the fuel

pip

Blush blush, sorry for the delay, let me know if it doesnt get there tomorrow and ill call ups and have them give me the tracking number that I lost.

Digi7ech

iTrader: (1)

I got home tonight to see it sitting in my house,

Thx!

I am still going to run premix though for the first week or two. The OMP on there now came off my car when it was running but I want to just make sure I installed it right before fully relying on it.

Digi7ech

iTrader: (1)

Alright since I have the OMP rod. I will use a ratio of about 350:1

That's like maybe 5 ounces or so if I add 10 gallons per fill up?

West TX RX-7

1 ounce per gallon = 128:1 ratio. I'd suggest mixing up a gallon in a can and shake it around, bout 12 ounces to that gallon and dump it in before you fill up.

1/2 ounce per gallon is 256:1

One more thing I might suggest is using sea doo pre-mix, not the gold label (synthetic), it's too expensive, they have a petrolium based pre mix in a blue bottle thats much cheaper.

Reason I say that is because of the low ash content. Water craft and non burning oil don't make the epa happy. The stuff for watercraft burnes really clean and doesn't smoke.

Sideways7

iTrader: (7)

I'm using marine outboard 2-cycle oil at about 300:1 and it works great. Im going to be taking the OMP off sometime in the next month, and I just want to get into the habit before then.

Digi7ech

iTrader: (1)

I think I got some Castrol 2 stroke stuff.
It's a square-ish white bottle. I'll have to check it out.

MrFC3S

When i go to the pump, i fill the tank with 10oz of 2Stroke, and then fill up 10-11gal of gas and then just pour in alittle more oil to compensate, is that ok to do it that way? am i mixing enough? I have the omp on, but im 85% sure its dead... also i use TC-W3 type 2 cycle.

thanks

Digi7ech

iTrader: (1)

wow. old thread.

yeah I use 1 ounce per gallon right now.

4CN Air

iTrader: (7)

I've used 1oz / 1gallon, but have reduced it to 1/2oz / 1gallon as recommended by some veteran tuners

edit; this is in an FD with no OMP

deadRX7Conv

Amount of oil needed depends on power level.

Those of you who practice premix prior to disabling MOP are doing it the right way. Get into the habit for a few months prior to removing OMP.

1 ounce per gallon is a simple fail safe for most engines. I would only use less on a stock/mild NA(.5 oz per gallon).
More power requires more oil. Hint: 1.5 oz/gal for 300hp, 2 oz/gal for 400hp........

Stick with a 2-stroke oil that has one or more of these certifications: API TC, ISO GD, JASO FC, NMMA TCW3.

Recycling old 'bottles' of drygas/FI cleaners/UCLs will give you variable bottle amounts for your fillups. This way you can keep your funnel and measuring in the garage and not waste time/fumbling at the gas pump.

4CN Air

iTrader: (7)

I'd say your numbers are on the high side, but to each his own. Better to error on the high side.

ErixHvn

Go get a 2 cycle mixing bottle at the boating supply or even Walmart. They carry a bottle w/ markings for ratios up to 100:1 oil-gas. Then it would just mean mutiply gas by 2 to get 200:1, by 3 for 300:1 Etc.
EZ and no guessing.

Turblown

iTrader: (12)

So you recommend 3 oz on a 600hp engine?

How many engines have you ran and disassembled to conclude to those ratios?

deadRX7Conv

None, my engines don't blow up. Not too many reliable 600hp 13b's in this website. How many reliable 600hp dyno runs are here? Plenty of fools blowing up 200-400hp engines on a regular basis here.
I plan on running my 13b forever without a rebuild.

Use whatever ratio you want. I don't care. I gave my personal opinion.
More power needs more oil. More RPM needs more oil. If you want to run it lean, go for it. Hell, I've heard of people not running ANY oil with OMP disabled. I wonder what the life for those motors are.

BTW, an ounce of motor oil has more oil in it then an ounce of TCW3. Most TCW3 oils are ~20% distillates(kerosene) used to keep those engines clean.

And, some 2-stroke oils need to be run at certain ratios to be effective.

Its up to you to research the brand you choose and to determine what the most effective ratio is for your application.

I'd personally lean toward a little rich then a little lean. Better be safe then sorry.

J-Rat

iTrader: (2)

Shoot,

I run 1 oz per gallon on my 350 RWHP car...

Sideways7

iTrader: (7)

I believe Carx7 ran 1 oz. per gal on his 450+ HP car. You can get the mixing bottles at autozone as well.
And I never did take off the OMP. lol

4CN Air

iTrader: (7)

no need for measurment bottles. Most 2 cycle oil has a view finder in the side. I get it in pints. Mix half the bottle (8 ounces) to a fill up (~15gallons).

More power/rpm requires more FUEL, which in turn brings more OIL!

I made 425whp at KDR. I was mixed 1oz:1gallon, WAY too much smoke when doing hard pulls. Dave recommended 6 oz per fillup. I'm sticking with 8oz's for now.

RotaryEvolution

iTrader: (30)

1oz per gallon is a good rule of thumb for any application with no OMP, richer may cause more spark plug fouling issues but it is safer for the motor.

with the OMP in place a good number is .5oz per gallon but it is all personal preference. less oil=more wear.