110 octane fuel

Joined
Apr 28, 2013
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186
Have you ever heard of anyone using 110 octane not that i need the extra power but its like 7 a gallon my dad use to put like 5 gallons in his tank is it cleaner will it hurt the engine will it idle just as good. I was thinking about putting half 110 in mine does it have ethonol
 

Howard Sterndrive

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Re: 110 octane fuel

Octane isn't power. Higher octane = lower volatility - less likely to detonate in high compression engine. You probably wouldn't notice any difference over 87 octane.
 
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Re: 110 octane fuel

Octane is power you notice the difference believe me if a 5.7 chevy has 135 compresion isnt that higher than a boat motor i was just wondering about if its cleaner and a more pure gas cause i only have to ride 30 min to get the gas its like putting nitro on car almost but really only 108 octane i like i know there has to be someone who knows about it cause alot of racers use it
 

tazrig

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Re: 110 octane fuel

Unless your engine is specifically designed to run on higher octane all you are doing is making your engine run hotter. The higher the octane the hotter the spark has to be to detonate or explode the gas and the hotter your engine will run.
 
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Re: 110 octane fuel

I figured the higher the octane the lower the spark would have to be cauae its more flamable so wouldnt take as much spark and have you ever heard of anyone spacing the spark plug with washer where the spark will line up with vaule just right
 

Autotech1

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Re: 110 octane fuel

Higher octane does not make more power. Higher compression and more spark advance makes more power and requires higher octane (slower burning) fuel.
 

tazrig

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Re: 110 octane fuel

have you ever heard of anyone spacing the spark plug with washer where the spark will line up with vaule just right

Stop trying to out think the engineers that designed your motor. You will end up damaging it or at the very least shortening it's life. It was designed for 87 octane not jet fuel.
 
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Re: 110 octane fuel

Ok i read up higher octane burns cooler but is harder to detanate so ill probly leave that alone i believe the 110 is leaded. But wonderung about to line up the spark with vaule
 

Autotech1

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Re: 110 octane fuel

Its called sparkplug indexing. Unless your motor is a four stroke you don't have intake valves.
 

boobie

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Re: 110 octane fuel

The only 2 stroke mtrs I know of where the plugs need indexing are the Evinrude DI's and the E-Tecs.
 
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Re: 110 octane fuel

I was just asking cause i heard of guys doing that are car engines and it will gain not much horse power but was wondering about it my motor running a little high idle and i cant lower the idle cause it will jerk dont know what would cause that i adjusted the screws and got it to lowest idle where it would be smooth but still a little high and i dont know how to check points and coil to see if any problem are there
 

Chinewalker

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Re: 110 octane fuel

So, it's a 1971 40hp. Point of note, those Big Twins were never the smoothest idling motors - lots of mass moving about inside.

As for the "jerk", it's possible it's running lean at idle. Opening up the low speed needle valve a hair might help.

Also, what are your compression numbers? Good to get a baseline reading so you don't chase false issues later...
 

The Famous Grouse

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Messages
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Re: 110 octane fuel

Octane is power you notice the difference believe me if a 5.7 chevy has 135 compresion isnt that higher than a boat motor i was just wondering about if its cleaner and a more pure gas cause i only have to ride 30 min to get the gas its like putting nitro on car almost but really only 108 octane i like i know there has to be someone who knows about it cause alot of racers use it

Octane alone does not produce more power. Boy Racers will tell you anything and everything produces "more power'.

Show me their dyno printout comparing outputs at different octane levels. Untill I se the numbers, it's all just BS.

The truth is that higher octane can only be a benefit when the engine is designed and calibrated to run on that octane. In aviation, high-octane fuels of up to 145 are common, but as many Boy Racers have found out, if you put 130 green into a car, rather than getting "more power" what they get is a car that runs like crap.

Also, where are you getting this 130 octane? If you ARE getting Av Gas (and I suspect you are) you should know that it is illegal in many states to use that fuel in anything except an aircraft because it contains lead. And yes, in some states this DOES include watercraft.

Please leave the Av Gas to the people who know how to use it properly.

Grouse
 
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Apr 28, 2013
Messages
186
Re: 110 octane fuel

I have to ride to indiana to get the gas but is the lead in it good for the values its actually 108 octane i figured more pure and might help with my idle issues but if i do get any it will be half and half just to see how different it will run .i remember the difference it would make in a car but could make my motor idle worse has to be cleaner than the stuff at bp with all the aditives im just learning about the new gas now
 
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Apr 28, 2013
Messages
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Re: 110 octane fuel

To chinewalker the wierd thing is when i had the old gas like 5 years old it was idleing just fine i could turn all the way down and it would still run barely putting then next day the problems started so i got new gas and didnt help thats why i think it has to do with points or coil ive adjusted fast idle and low about a turn and a half out but i had running so smooth the day before u couldnt hardly see motor move it wants to back fire or u can tell one cylinder isnt getting fire if i rev up high then let off fast it will do that. Takes a sec to smooth out does this motor have timing advance when reved up i know i should start new thread
 
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