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Ford 9N, 2N & 8N Discussion Forum
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OT Octane booster

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Rob

08-08-2005 05:35:13




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Anyone have experience with octane boosters? What do I look for or stay away from or should I just keep two grades of gasoline.
My chainsaw manual says use high test (90+) gasoline and maybe that"s what I amm suppose to be using in the other 2-cycle engines; have not checked the manuals yet. If they start easier then that is what I want to use, for sure.
I have 87 octane and I am thinking I can mix some octane boost when I prepare the fuel mix for the two cycles. Seems that would be handier than keeping two grades of gasoline around. Is there good stuff, bad stuff, it does not work...what?

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RoNofohio

08-08-2005 12:19:31




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 Re: OT Octane booster in reply to Rob, 08-08-2005 05:35:13  
Don't know if it helps, but I've always heard that you can mix equal parts 87 and 93 to get 90. That being said, I was surprised to read that your 2-cycle engine recommends an octane level that is made primarily for high compression engines. I'm going to have to check the specs for my chain saw and weedeater now..Ron



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Rob

08-08-2005 12:32:13




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 Re: OT Octane booster in reply to RoNofohio, 08-08-2005 12:19:31  
The is a Husqvarna 345. Real nice nice saw till now it won"t start. I think I need a spark plug. I was looking at the book to make sure the fuel mix was right and I noticed it says use 90 octane or better. I"m like you, I need to check my other stuff now.
The fuel line was cracked, almost busted in two, and now that"s fixed it still won"t start. I don"t know what"s wrong it started first or second pull last year and before. I got a spark but maybe it isn"t good enough. Maybe some more octane will make the difference.

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Dean

08-08-2005 12:57:42




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 Re: OT Octane booster in reply to Rob, 08-08-2005 12:32:13  
Do not use fuel stabilizer in 2-cycle mix. It will attack the plastic fuel lines and the synthetic flapper in the carb causing either hard starting or no starting. Even without stabilizer, 2-cycle mix will last a year or more.

Dean



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Rob

08-08-2005 13:31:45




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 Re: OT Octane booster in reply to Dean, 08-08-2005 12:57:42  
I don"t use a fuel stabilizer. Except, I got Poulan, Craftsman, and Lawn Boy 2-cycle oil all claiming to have an added fuel stabilizer.
Is that flapper underneath the diaphragm or where? Cause this saw should start. I had the diaphragm off once and it"s getting gas and looks nice under there.
The small engine guy gave me a package of "any ratio" 2-cycle oil mix and says "try this.". Don"t matter what ratio, that one package to a gallon is all you need; so he says. I used it and the saw ran but now after burning that gallon and near a year later the saw won"t start. I don"t know if that has anything to do with it. The first problem was the fuel line. The fuel line wasn"t rotted but it was tore. The tear was up in there I can"t see how it happened but there it was, tore and split clear through more than half way around. Hardly room for a mouse to get up in there and no teeth marks so I don"t believe a mouse chewed it.
Anyway, fuel line is fixed and it won"t even try to start. Sputtered a few times before I found the fuel line problem and a couple times right after I got it fixed. But now...nothing. Not even when I pour some gas in the carb. Made fresh fuel, twice. Does 2-cycle oil go bad in a sealed can? Must be 3 or 4 years old.
Ding dang 2-cycle PITA engines.

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TIMW(PA)

08-08-2005 09:31:41




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 Re: OT Octane booster in reply to Rob, 08-08-2005 05:35:13  
1-2 oz.'s of Acetone is a quck and easy octane booster. It also have heard that it will give about a 3 MPG increase in your gas mileage with 2 or 3 oz.'s in each fill up



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Gaspump

08-08-2005 12:04:05




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 Re: OT Octane booster in reply to TIMW(PA), 08-08-2005 09:31:41  
I would shy away from that one. Acetone would not stay in gasoline. It would vaporize very quickly and make for a ticking small bomb of your gas tank. Put an ounce of acetone in a small tin can and watch it evaporate. I used to buy the stuff by the tank truck full and was ever so happy to see the product replaced by a safer one in the early 1980's. Never had a serious fire nor serious explosion with acetone but our people were skilled in using it and always handled it with due caution.

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souNdguy

08-08-2005 05:44:55




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 Re: OT Octane booster in reply to Rob, 08-08-2005 05:35:13  
Octane boost does exactly what it says.. it boosts the octane number.. Your old tractor was around when octane numbers were lower.. like high 70's I'll guess. The higher the octane number.. the more resistant the fuel is to early combustion.. or 'cooking off'.. (knocking.. etc.. ).. Perhaps those air cooled engines what the higher oct fuel to prevent just that.. pre-detonation.. etc.

Soundguy

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Ole Country Boy

08-08-2005 06:21:22




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 Re: OT Octane booster in reply to souNdguy, 08-08-2005 05:44:55  
Shoot, never even considered it on my 2 cycle engines. I use 4 different ones and all use plain ole regular fuel mixed with 50-1 oil. All run great! I do dump the ole mixture at end of eason and mix new next year.

In my humble opinon, those additives are a waste of money.



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