87 in ope?

[The motor guy]

Is it mainly compression that makes them call for 89 or higher octane in 2 cycle equipment? I tried it one time in my old echo trimmer and the would misfire and stall randomly. I'm not sure if that was the fuel or just the trimmer because it was already a bit finicky since it was so old. Does the fact that they make them run so lean cause them to need higher octane to?

 

[Ohle_Manezzini]

2 stroke have loee compressio ratio, but have crown buildup problem... If it doesn't ping or knock at wot bursts whem warm, I'd use a good detergent add 87. What they cover is the fact that ope runs all the time near wot, if it knocks, destroy itelf like a MI, msg, in 5 eeconds...

 

[BrianF]

I use 87 all the time in 2 strokes and 4 strokes. I have tried 91, which is ethanol free and found no difference in performance. I drain all my 2 strokes for the winter and use a healthy dose of stabil for the 4 strokes and drain the carbs if they have a shut off.

I have yet to run into any octane related issues. Ever.

 

[DemoFly]

87 in everything.

 

[BrocLuno]

+1

 

[Donald]

In NY the E0 is always high test. So all my OPE gets high test since I want E0. Or premix.

 

[Rickey]

93 E-0 runs much better in my 2-stroke equipment. (two weed whackers)

With 87 E-10 there is audible pinging and some sputtering in the exhaust at WOT.
The pinging is pronounced enough to be audible in spite of the exhaust noise.

I speculate that the oil gas mix results in a slight octane reduction.

The Echo unit actually specifies 89 or better in the owners manual.

There is also less "bogging" upon application of throttle with the E-0.

 

[The motor guy]

Well I was trying to cut costs, I think i'll just stick with 89 octane. I have properties where I'm running full throttle for an hour or two. I'm pretty sure our high octane has ethanol just like the rest of the grades where I'm at.

 

[bubbatime]

The way I understand it, when you add two cycle oil to the gasoline, it lowers the octane. So while the engine really needs a 87 to run correctly, if you start off with an 87 octane and then mix it with two stroke oil, you now have something like 85 octane. That is why most 2 stroke equipment calls for 89 octane fuel at least.

 

[lexus114]

i dont use 87 octane in anything i own.

 

[Dominic]

I run 89 E-10 or 87 if Ethanol Free. The risk of octane loss in E-10 is high because the ethanol acts as an octane additive to the fuel and easily evaporates or gets water saturated. No issues so far.

 

[hatt]

I run 90 octane non ethanol. If that were not available I'd run 93. I can't imagine why the average person would cheap out on 2 stoke OPE gas. There's no meaningful cost saving to be had.

 

[dave123]

VPracing 4-cycle SEF and blend my own 2stroke mix don't get any better.

 

[BigCahuna]

Been using 87 octane in everything I've owned for at least 20 years. Cars, motorcycles, lawn mowers , weed wackers, leaf blowers, and my generator. So when am I gonna start having problems with 87 octane gas?.,,,

 

[Michael_P]

87 for everything, 89 if its going to be stored for 6-12 months or more.

 

[bmwpowere36m3]

87 is fine... I use 89, since my main DD takes that. Fill a few gallons into the car, before filling the container.