MS462

[Evansaw]

Yah ... the best “mod” is often a sharp chain lol ... that being said a righteous ported saw and a sharp chain WILL outproduce a stock saw with a sharp chain by a considerable amount at the end of the cutting session at the expense of using more fuel ...

Of course! Porting must be an addiction! I don’t have a ported saw but now I want to learn to port them! Lol

 

[Dub11]

I think I bought 91 octane e free in NY at a station near gtg.
Runs good in my saw

I buy 102 at $8 a gallon just for storage reasons lol.

 

[Evansaw]

I buy 102 at $8 a gallon just for storage reasons lol.

That’s very CHEAP in addition of what i m paying in this country with 2€ per liter but still not guaranteed quality of original 100 octane. Lol.

 

[frank rizzo]

Of course! Porting must be an addiction! I don’t have a ported saw but now I want to learn to port them! Lol

For some folks yes ! It’s not rocket-science though some can Make it seem so ... Lotta secrecy and incantations using chicken-gizzards and black-lights !

 

[smokey7]

This thread has taken some weird turns and bumps. But I just found a new source for effete gas yesterday. It’s 89 for 3.39 a gallon. I’ve been driving to the east side to a marina to get 87 or 91 the 87 was 4.50 and the 91 was 5.09 or something like that. I’m stoked to be able to get mid grade e free at a busy station for a good price. For ,y highly modded skis I’ve been running turbo blue at 8.50 or 9.00 per gallon. I have no choice in those motors as I built them to need the fuel and they will melt down quick from deto if I don’t run it.

 

[RI Chevy]

Your lucky you can get it.

 

[Wonkydonkey]

All the high octane is trying to do is to keep the fuel stable and not ignite before spark happens.

Yeh, it burns slower, but how much slower idk.

 

[Dub11]

Yeh, it burns slower, but how much slower idk.

I'm sure their is some fancy Maths and all but its above my paygrade

 

[Bigmac]

Yeh, it burns slower, but how much slower idk.

New race gas doesn’t burn slow, but is resistance it predetanation is high, it is formulated for high compression, once lit it burn fast...so they tell me! Lol

 

[Bigmac]

For some folks yes ! It’s not rocket-science though some can Make it seem so ... Lotta secrecy and incantations using chicken-gizzards and black-lights !

Not rocket science....black art! Lol

 

[AlfA01]

Yeh, it burns slower, but how much slower idk.

Not sure how much slower, but much like a diesel engine, high compression and heat are required to ignite the AV gas. This may be where saws are lacking in that they are smaller displacement engines and may not build enough heat, or have enough juice from the coil to get an efficient burn of the AV gas. My guess is that saws burn it, but with a lot more waste gases from unburned fuel. Higher octane doesn't boost performance, per se, as much as it is the anti-ping/knock properties that is necessary for high compression engines.

Also, higher octane fuels perform better at high altitude. If you travel to some places that are mountainous, such as Colorado, Wyoming and Montana, you won't find low octane (economy) gas at any station, as the cars just aren't able to burn it well at those elevations. AV gas is designed to be burned pretty high in the atmosphere, where temps and atmospheric conditions vary greatly and impact fuel burn quality much more so than at sea level and low level areas. Aircraft have controls for leaning and richening the fuel mix to correspond to altitude changes so they can accomplish an efficient burn no matter what altitude they are flying at. Much like our screwdrivers for carb tuning, except it can be done from the cockpit or via computer on newer A/C.

For some folks yes ! It’s not rocket-science though some can Make it seem so ... Lotta secrecy and incantations using chicken-gizzards and black-lights !

That's funny!

 

[Evansaw]

Not sure how much slower, but much like a diesel engine, high compression and heat are required to ignite the AV gas. This may be where saws are lacking in that they are smaller displacement engines and may not build enough heat, or have enough juice from the coil to get an efficient burn of the AV gas. My guess is that saws burn it, but with a lot more waste gases from unburned fuel. Higher octane doesn't boost performance, per se, as much as it is the anti-ping/knock properties that is necessary for high compression engines.

Also, higher octane fuels perform better at high altitude. If you travel to some places that are mountainous, such as Colorado, Wyoming and Montana, you won't find low octane (economy) gas at any station, as the cars just aren't able to burn it well at those elevations. AV gas is designed to be burned pretty high in the atmosphere, where temps and atmospheric conditions vary greatly and impact fuel burn quality much more so than at sea level and low level areas. Aircraft have controls for leaning and richening the fuel mix to correspond to altitude changes so they can accomplish an efficient burn no matter what altitude they are flying at. Much like our screwdrivers for carb tuning, except it can be done from the cockpit or via computer on newer A/C.



That's funny!

Another interesting and useful approach. Made me think

Just thought i could try canned fuel from R/C models. It was mixed when i was young ready to go. Don’t know the oil/fuel ratio though.

Still in Greece with 95,98,100 ron fuels Stihl Motomix is the best you can get cutting trees between 800-1500meters altitude.
And the CLEANEST fuel by far! The saws love it. They rev sky high.
Afterward comes a good 100octane fuel. Then the “economy” 95ron.
Mountains love octanes and M tronic seems to love them too


But have to say for chainsaw stihl mix: no unburned fuel exhaustion. Prolly that has to do with the difference of heat and humidity at the atmosphere cause actually planes fly at well below zero temperatures at the altitude so you have fuel existing unburned in liquid form when chainsaws operate at whatever temperature you start that day Summer or Winter.

And the new high rated fuels burn instantly by the way.

 

[Deets066]

Canned fuel isn’t going to change rpm in an Mtronic saw

 

[Evansaw]

Canned fuel isn’t going to change rpm in an Mtronic saw

Not changing the limit number.
throttle seems more responsive and instantly rev.

 

[Evansaw]

https://www.popularmechanics.com/ho...-small-engines-from-the-wear-and-tear-of-e10/


Found this article which resumed as “get as high octane as you can for small engines”... he recommends 93ron. Must be considered good gasoline in US market. For my country is useless as “economic” start at 95ron. That’s believing product is pure at pump.

So “boutique fuel” as they call it is also their best recommendation.

Anyway i ll call a few people from Petroleum Market i know. Chemical Engineers will enlighten things.

However I cannot believe Stihl not making a good product which should operate at Indonesia, North Pole, Europe etc almost same.

Avgas is for propelled engines, very low end tech so it resembles chainsaws. Nothing to do with jet fuels.

 

[Deets066]

You should read some of the threads on this site. Some people have done some very extensive testing. Specific to chainsaws

 

[T.Roller]

You should read some of the threads on this site. Some people have done some very extensive testing. Specific to chainsaws

But deets, chainsaws are like airplanes.

 

[AlfA01]

Canned fuel isn’t going to change rpm in an Mtronic saw

Yep.

 

[Deets066]

But deets, chainsaws are like airplanes.

I’m gunna put a prop on my 066. Be like a hand held jet pack

 

[AlfA01]

I don’t know if such low octane is available at this part of the world.

Yes it is available. Under a different method of octane rating.

87 Octane US = 91 Octane EU.
91 Octane US = 95 Octane EU
93 US = 98 EU
and so on.....

US fuels are not rated using RON. They use Pump Octane as the rating.