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post #1 of 22 (permalink) Old 07-26-2010, 01:29 PM Thread Starter
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High Octane fuel

Some of you guys that are running high octane fuel or something besides pump gas what are you running, where do you buy it, what are you paying. Just never seen much on here about that issue and was just wondering if there was many doing anything besides pump gas for some of you guys that have the high compression, big horse power engines.

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post #2 of 22 (permalink) Old 07-26-2010, 03:26 PM
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Merlin can probably answer this better than me. I know he runs it and his engine temps lowered when he switched to it. I will be running it 50/50
93 octane/ race fuel . That is, when I start riding again... It has been just to damm hot .

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post #3 of 22 (permalink) Old 07-26-2010, 06:19 PM
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Originally Posted by bigdaddy View Post
Some of you guys that are running high octane fuel or something besides pump gas what are you running, where do you buy it, what are you paying. Just never seen much on here about that issue and was just wondering if there was many doing anything besides pump gas for some of you guys that have the high compression, big horse power engines.
I run VP fuel from time to time but normally 92 is the norm.
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post #4 of 22 (permalink) Old 07-26-2010, 07:45 PM
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we found a few places that sell ethanoyl free gas. usually run that.

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post #5 of 22 (permalink) Old 07-26-2010, 09:37 PM
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Unless your having detonation issues then 87 is best. Higher compression pistons require it sometimes



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post #6 of 22 (permalink) Old 07-27-2010, 07:57 AM Thread Starter
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Why would 87 be better than 93 or higher

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post #7 of 22 (permalink) Old 07-27-2010, 08:58 AM
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I think the guys that usually run race gas have engine work done. The guy that built my quad years ago said a good rule of thumb is 10 octane per 1 compression. The Compression on the quad was like 10:1 or somerhing so I ran VP 110 octane with 91 octane at a 50-50 ratio making about 100 octane. Im not sure what the compressionn on the Teryx is but I have just filled my gas cans with 91 octane. I do know that higher octane can help reduce engine temps, allthough I dont know by how much. Price differnce on 10 gallons will ony be a buck or so
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post #8 of 22 (permalink) Old 07-27-2010, 01:03 PM
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There are way to many factors that determine octane requirements. Static compression, running compression, cam profile, combustion chamber shape, piston design, cylinder bore size, cylinder coating, ambient out side air temp, elevation, humidity, jetting, type of fuel.... etc. etc. etc. just to name a few.
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post #9 of 22 (permalink) Old 07-27-2010, 02:35 PM Thread Starter
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There are way to many factors that determine octane requirements. Static compression, running compression, cam profile, combustion chamber shape, piston design, cylinder bore size, cylinder coating, ambient out side air temp, elevation, humidity, jetting, type of fuel.... etc. etc. etc. just to name a few.
That might be going just a little to far for me, since temp and humidity can change in Louisianna every time the wind blows.
I will be running 12.5-1 compression ratio with plus 4 valves, 39 mm tbs, Glenn at AMR done a nice job on my heads and I will probally just run a good 104 to 108 octane fuel, I might try mixing that with 93 octane. I want to see what some of the different fuels or fuel combos will do to engine temp. Just something else for a big over grown kid to play with.

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post #10 of 22 (permalink) Old 07-27-2010, 05:51 PM
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That might be going just a little to far for me, since temp and humidity can change in Louisianna every time the wind blows.
I will be running 12.5-1 compression ratio with plus 4 valves, 39 mm tbs, Glenn at AMR done a nice job on my heads and I will probally just run a good 104 to 108 octane fuel, I might try mixing that with 93 octane. I want to see what some of the different fuels or fuel combos will do to engine temp. Just something else for a big over grown kid to play with.

+4mm valves and chamber work could actually drop that pistons stated static compression by 2 points. The best way to know for sure what your actual compression will be is to assemble the motor taking very careful measurements and divide it all out and see what you end up with.

On a 450cc based motor 12.5 is the limit of 91 octane fuel. I am not referring to a 400ex or raptor motor, but yfz's / 450r's etc.

This motor I would need to spec it out for a better idea of actual running compression vs. actual octane requirements, and I have not done so.

IMO based off what I do know of this V twin motors set up, your 12.5 static will be fine on a 98 octane at sea level in 90* + heat.

High rev cams will bleed off more compression thus lowering a motors octane requirement.

Valve and combustion chamber work will also make the cc of the combustion chamber larger then stock thus lowering the need for higher octane.

Depending on the piston top design and features can also help fight det and help the motor. I'm not sure if the pistons in these kits are running such features yet or not. Ring material, ring end gap, anti det grooves, altered squish bands, piston top flame front designs......

Like I said lots can be gained or lost in compression and fuels with a motor.
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