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Tool Talk Discussion Forum

Hi-Test for chainsaws?

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Kent in NB

02-07-2006 16:11:04

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Some debate around here as to using Hi-test or regular unleaded fuel, when mixing up oil and gas. The manual is not specific. I am using HUSQAVARNA saws and working in hardwood. Hugh McKay, here's your chance!

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Ken in Mich

02-08-2006 15:52:28

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

I just checked my Husky manual, and it says to "always use a fuel with a minimum octane of 90". I have always used prenium in it. Its a Husky 268.
You should have a page in your manual called "Fuel and chain lubruication", thats where I found the above.

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wfw

02-08-2006 07:06:11

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

this chain saw sight should have all th info you neew. I've always run regular in my huskie, but maybe I need to switch to hitest?

http://www.acresinternet.com/cscc.nsf/673d78ec01557aea88256b00005457e6/d8d083a8d741e3db88256c9b00780d89?OpenDocument

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barnrat

02-08-2006 04:19:33

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

I always use Premium gas in my saws one Stihl one Jonsered. I can't even remember what the manual says. I do know that the Honda gx160 engine on my feed cart has lasted 5 years using only premium gas. When my father inlaw had it he used 87 octane he could only get a year and a half out of the same model engine.

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MarkB_MI

02-07-2006 19:42:21

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

You can't hurt your saw by running too high octane fuel, but you can sure hurt if the octane is too low. Seems to me that my Stihl specifies minimum 91 octance, but it doesn't specify whether that's Research, Motor, (R+M)/2 or some other system. So I just run premium to be sure; the cost difference isn't enough to worry about.

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TomTX

02-07-2006 19:32:42

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

My Stihl manual calls for minimum octane of 89. I use 92 and have never had a problem.
Tom

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Logan in SE Tex.

02-07-2006 19:13:19

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

I do not know about chainsaws but I bought a new Stihl weedeater last spring and due to EPA emmision requirements it has to have 91 octane and sales guy told me it would harm it to run lower octane. Cost is not a factor as I burned less than 3 gallons all of last year....it will never have anything but 91 octane.

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Butch(OH)

02-07-2006 17:44:31

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

You didnt say which model you have so a person cant be very specific but current Husky manuals call for 87 minimum octane. I have one heck of a time beliving that they would reccomend fuel that would screw up their own motors but what do I know. I bet that old gas and "mixed by guess" ruins a whole lot more saw motors than all other problems combined, including fuel octane.

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buickanddeere

02-07-2006 17:26:35

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

As long as the fuel doesn't contain alcohol which is a lube oil solvent. For all the fuel a chainsaw burns, the savings of running 87 octane tractor gas over 91 octane is ziltch. A chain saw engine is prone to detonation which is what burns holes through pistons or pinches rings lands and causes cylinder wall scoring. It may look like a lubrication failure but a high HP engine working hard with those little air cooling fins clogged with sawdust run awful hot. Hotter yet and more prone to detonation should the main mixture be set a wee bit lean. Too much oil in the mix can actually lean the mixture contributing to detonation. And oil has a low octane rating compared to gasoline, the more oil, the lower the octane of the air/fuel mixture. So yes, run run 91+ octane as saws, outboards and snowmobiles have lots of compression to squeeze more power out of the little engines.

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treeboy

02-07-2006 16:56:17

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Re: Hi-Test for chainsaws? in reply to Kent in NB, 02-07-2006 16:11:04

my 2 cents, they are designed to run on 87 oct, but hitest poss. gives them a little more um,. & airplane fuel gives em even more UMP, i use 2 gallon of fuel on lots of days & have put lots of hours on saws running regular old 87 octane, clean fuel & a clean air filter w/a sharp chain mean more than the fuel type. ps i like to see people w/ chaps & hardhats too!

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