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Premix

Old 06-07-11, 08:36 AM
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Premix

Hello,

Wondering what a good amount of premix is to run in my fuel.
Removed the stock oiling system on my race car.

What is everyone running? I'm assuming at a certain point it will start messing up my octance level.

Andrew.
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Old 06-07-11, 01:41 PM
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I run regular 87 octane, and use 4 oz of 2 cycle oil for every 5 gallons of gas.
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Old 06-07-11, 05:04 PM
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1oz per 1 gallon. Valvoline 2 cycle multi-purpose. No OMP.
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Old 06-07-11, 06:03 PM
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I run 100:1 (250 ml for 25 L). I have a handy 250 ml container left over from some additive which I fill and upend into a 25L fuel jug before filling. Between blending 50%50% C16 and 94 octane premium and the oil I feel like a mixoligist.

-Trent
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Old 06-08-11, 08:28 AM
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I'm with Trent.

100:1 with 94 octane

No OMP.
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Old 06-08-11, 09:01 AM
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Old 06-08-11, 09:49 AM
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Perfect, thanks gents.

I mixed in about 100:1 with my 94 (good guess!), car smokes a little on idle wasn't sure if I had too much.

Thanks,
Andrew.
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Old 06-08-11, 03:29 PM
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128:1

1oz per gallon...
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Old 06-10-11, 06:15 AM
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I've found performance increases all the way up to about 1:70 (roughly 2oz/gallon), haven't tested any richer than that.

Even this amount should not cause smoking at idle. But, the way I see it, if power keeps going up, that must mean that internal friction is going down, and if internal friction is going down, that must be better for the engine.

I wouldn't run it that rich on the street, mind you. I run about 1:200 on the street.
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Old 06-10-11, 01:56 PM
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When I was using RA super seals I ran 50:1 premix (quart on fill up) and the stock OMP set to go to max on a turbo car.

Seals still wore the holy hell out of the housings, but I had minimal smoking with the right premix (I like Mercury Quicksilver) and man the engine so clean on the inside, very light carbon in exhaust ports only @25k miles.

Cause of death- egt probe broke/melted off and pinched cornerseal.

Only time I had an issue with too much premix is when I put in a quart, drove to the gas station and put in 10+gallons of gas. The short drive of 20:1 premix fouled the trailing plugs and I had to rotate them into lead position. BTW, not much smoke.
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Old 06-14-11, 07:09 PM
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Originally Posted by BLUE TII View Post
When I was using RA super seals I ran 50:1 premix (quart on fill up) and the stock OMP set to go to max on a turbo car.

Seals still wore the holy hell out of the housings, but I had minimal smoking with the right premix (I like Mercury Quicksilver) and man the engine so clean on the inside, very light carbon in exhaust ports only @25k miles.

Cause of death- egt probe broke/melted off and pinched cornerseal.

Only time I had an issue with too much premix is when I put in a quart, drove to the gas station and put in 10+gallons of gas. The short drive of 20:1 premix fouled the trailing plugs and I had to rotate them into lead position. BTW, not much smoke.
that because you used SUPER SEALS classics dont.
I run 1:1
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Old 06-17-11, 03:43 AM
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1:1??? so you put gallons of 2 stroke oil in?
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Old 06-17-11, 12:20 PM
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Originally Posted by Bakemono7 View Post
1:1??? so you put gallons of 2 stroke oil in?
128:1 typo
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