Performance test: E10 vs Ethanol Free vs Trufuel

I tested these three fuels and timed my cuts and checked the cylinder temp.

 

I'd love to see some 87 in there to beat 'em all

 

Nice to see that the E10 runs well, but I'm more worried about the shelf live. I'll stick to burning E free.

BTW that 261 really rips. Is it all stock? What B and C?

 

Surprising results. I normally run ethanol ...have a tough time finding fuel without the alcohol in it.

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E10 lasts a lot longer than people expect. You've got several months. Now, I only buy a gallon of gas to use for saw use a at a time, but even if I have a lot left over, I use it in my weed wacker. It didn't seem to care.

 

It's not surprising to me. Stock saws are designed to run e10. That, and ethanol makes more power than gas.

 

I think e free does have a better shelf life. I usually tell people don't let it sit more than a month. I read something from Stihl or a reputable source that said you could use it for up to 2 months. The big thing with e10 is how you store it. I see people storing it in cans with out lids. I've noticed that if I pour some out in a bottle to pour in a problem engine, that gas in the bottle goes stale (at least smells like it) very fast, like in hours, especially if the sun is shining on it.

The 261 was running a 16' 3/8LP bar with PS3 chain and a 8T sprocket. The saw has a muffler mod and that is it.

 

Maybe I'll do 87 vs mid vs 92 in the future. Actually didn't Redbull do that?

 

I primarily run E10. I was driving past this station so it was convenient to get the e free gas. I have about dozen more saws than I need so some do not see as much run time as others. I've never had gas related problems. Recently I have started draining the tank, so when I go to use that so I don't have to dump the gas an waste it.

Yes it does. I also found out in my car that E10 does not kill mileage like people claim. I picked up about 1/2 MPG burning more expensive from a gas station that is out of my way.

 

Nicely done.

But you'll ruin your high performance saw.

mdavlee did I believe.

 

I run 90 octane ethanol free fuel because it's the closest gas station to me, it's a marina less than a half-mile from my house. Along with the 90 octane ethanol free fuel I use Stihl synthetic 2-cycle oil at 50:1.

 

Thanks, I run premium gas because I feel it has better shelf life. I did a little looking and Sunoco says 87 is good for 3 months and 93 is good for 9 months.

Sunoco Race Fuels

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I run the ethanol free for the same reasons as everyone else. The phase separation that occurs from sitting and plus I am not convinced that the alcohol is not harder on the diaphragms inside the carb.

Plus the ethanol will attract water which will corrode carbs too. It is good to know that the performance is there but I will stick with my ethanol free fuel and 32-1.

 

E85 does. My flex fuel Taurus dropped 20% on E85 vs E10

 

It technically doesn't make more power but it does.
Ethanol per volume does not carry or have the same BTU of energy as regular gas.
You need more of it for the same output. You also technically need a richer stoichiometric ratio Wich means you burn even more ethanol to reach lambda.
A 10% mix is such a small amount the mpg difference is hard to see in a car.

Ethanol has cooling properties as it burns and vaporizes, Wich increases hp.

If I had to guess the mtronic is like speed density. It's present to run on ethanol blend, but can't tell the difference between e free or not. So if I had to guess it runs leaner and meaner on ethanol. I'd be really interested in seeing an arf guage between the two fuels to verify.
I can tell you on cars/trucks it shows the air difference in afr.

Why 32-1?

 

I’m with you. I mix up 2.5 gal of 93 with ethanol and between saws, weed whacker, and blowers I burn through it in less than a month. I put a little sea foam in and have never, ever had a problem.


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Yes, so how is it "tuning for Max power"? Has there been any information on how mtronic actually works or just the same marketing jargon?
Where is a software engineer/coder when you need one!

It works(the description you just gave), Just like speed density. My point is that it uses preset conditions to "find" Max rpm. It's not really calculating much of anything. There is no feedback sensors other than map and rpm.

Stihl says it adjusts for fuel quality but what does that mean? There are no fuel sensors or 02 or knock sensors......so... It means if it's not pulling the correct rpm it defaults to x table. A preset table. If that doesn't work it changes spark to y table.
Just like speed density. There are several speed density systems that run the same way. 4-5+ tables for different conditions.

 

Figured it was modded, cuts a lot faster than my 260!

 

I prefer the 32-1 because on some saws the bearings in the bottom end can use it. Especially when I am taking a saw that is made to run at 11,000 rpm's and cranking them up to 13,000 rpm's.
I have no problems with excessive smoke or with carbon on the piston or rings. It is a personal preference and I am not advocating that anyone else does it.