Mixing "race fuel" with pump gas-

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Ducati Monster Forum > Moto Board > General Monster Forum (Moderators: ducpainter, bigiain, Speeddog) > Mixing "race fuel" with pump gas-

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Topic: Mixing "race fuel" with pump gas- (Read 5357 times)

Speeddog

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Re: Mixing "race fuel" with pump gas-

« Reply #15 on: November 20, 2010, 12:32:54 PM »

Quote from: mac900 on November 20, 2010, 11:44:38 AM

I understand the need to run leaner mixtures at higher altitudes but why on earth would octane have anything to do with that? Octane basically deals with how fast the fuel burns and when it starts burning. Lower octane igniting sooner than higher octane and all that.

At higher altitudes, peak cylinder pressure is lower, much like with a lower compression ratio at low altitude.


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Radar

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Re: Mixing "race fuel" with pump gas-

« Reply #16 on: November 20, 2010, 03:30:41 PM »

I'm not running a 796, and I don't live at high altitude...

I'm on the West Coast... very low altitude, and I ride an 05 S4R-

I'm not sure how the confusion came about.

Sunoco has various fuels available--leaded and unleaded and oxygenated and non-oxygenated... Octane ratings start at 110-


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ducpainter

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DILLIGAF

Re: Mixing "race fuel" with pump gas-

« Reply #17 on: November 20, 2010, 03:49:31 PM »

All the altitude controversy aside...

race fuels can be very corrosive and require special care for the motor after every time it's run.

I'd avoid them for a street bike.


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Re: Mixing "race fuel" with pump gas-

« Reply #18 on: November 20, 2010, 04:45:53 PM »

The only additive your gas needs.

coffee


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Re: Mixing "race fuel" with pump gas-

« Reply #19 on: November 20, 2010, 05:32:28 PM »

im not going to lie, if you gave me a 5 gallon jug of race fuel, id drop 1 gallon for every 2 gallons of regular fuel and use it as is just because its free gas!


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Re: Mixing "race fuel" with pump gas-

« Reply #20 on: November 20, 2010, 07:03:18 PM »

Quote from: Buckethead on November 20, 2010, 04:45:53 PM

The only additive your gas needs.

coffee

http://www.gixxer.com/forums/showthread.php?t=226570


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Duc796canada

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Re: Mixing "race fuel" with pump gas-

« Reply #21 on: November 21, 2010, 04:30:06 PM »

Quote from: Radar on November 20, 2010, 03:30:41 PM

LOL...you caught that one too...I think the 796 reference came from me recommending the use of the 89-91 and I ride a "796," so subsquent postings went that way. DOH!!! Shocked


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Re: Mixing "race fuel" with pump gas-

« Reply #22 on: November 21, 2010, 06:30:35 PM »

Quote from: Speeddog on November 20, 2010, 12:32:54 PM

At higher altitudes, peak cylinder pressure is lower, much like with a lower compression ratio at low altitude.

Makes sense now that you put it that way.


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Re: Mixing "race fuel" with pump gas-

« Reply #23 on: November 22, 2010, 01:51:57 PM »

Quote from: Buckethead on November 20, 2010, 04:45:53 PM

The only additive your gas needs.

coffee

I use a blend (highly secret ratio) of Mentos and Brawndo in my S4RS. No problems so far, but it is tricky to handle. I have to make sure I don't spill in on any grass, and to keep it away from any Diet Coke.


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Randy@StradaFab

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Re: Mixing "race fuel" with pump gas-

« Reply #24 on: November 22, 2010, 03:35:48 PM »

I may be dead wrong but I believe detonation is more about ignition timing than compression. You can have an engine with 8:1 compression ratio and make it ping if the timing is advanced too much.


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ducpainter

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DILLIGAF

Re: Mixing "race fuel" with pump gas-

« Reply #25 on: November 22, 2010, 03:55:18 PM »

Quote from: RMartin on November 22, 2010, 03:35:48 PM

I may be dead wrong but I believe detonation is more about ignition timing than compression. You can have an engine with 8:1 compression ratio and make it ping if the timing is advanced too much.

Not entirely.

While it's true that advanced timing can cause a low compression engine to ping...

You can retard the timing on a high compression engine and it may still ping if the octane rating is too low.


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Re: Mixing "race fuel" with pump gas-

« Reply #26 on: November 22, 2010, 09:50:58 PM »

Quote from: RMartin on November 22, 2010, 03:35:48 PM

I may be dead wrong but I believe detonation is more about ignition timing than compression. You can have an engine with 8:1 compression ratio and make it ping if the timing is advanced too much.

Compression ratio, timing, volumetric efficiency, combustion chamber design, air fuel ratio running temperatures, ambient air temperature and altitude will all affect detonation.