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Old 04-28-2009, 07:59 AM   #1
Racer997
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Understanding Octane and Race Fuels

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Old 04-28-2009, 08:33 AM   #2
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nice read.
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Old 04-28-2009, 08:57 AM   #3
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....good find!! Thanks for posting this!!
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Old 04-28-2009, 09:56 AM   #4
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good read, but if i remember right the pro's been running mr-pro 4.1 race fuel which was running up to 35 to 40 dollars a gallon and dam does it smell good.
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Old 04-28-2009, 10:31 AM   #5
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It's funny once in awhile on rides when we fill up someone will ask why I'm putting 87 octane in my bike and not 91 or 93. I tell them because that's what the manual recommends and as long as it's not detonating why spend the extra on higher octane if you don't need to.

There really is a big misconception about octane. Octane is a 'Detonation inhibitor' which means it slows down the burn of the fuel. Instead of a bang you have more of a puff. It's amazing how many people don't know this and they will not take the time to simply pull it up on the internet and research it. Instead they rely on word of mouth from someone that thinks they know what they are talking about. Just my little rant is all.
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Old 04-28-2009, 10:33 AM   #6
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It will depend in the racing.
AMA Flattrack - Spec fuel VP C12
AMA Supercross - Most teams run C12 or C16
AMA Superbike - This season is a Spec Sunoco, but in 2008 every championship was won on VP MRX01, and before that VP MR9.
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Old 04-28-2009, 01:05 PM   #7
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Which fuels can't be left in the tank/carb?
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Old 04-28-2009, 01:41 PM   #8
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Quote:
Originally Posted by Pre-K View Post
Which fuels can't be left in the tank/carb?
In the early days of oxygenated fuels, such as VP's U4, leaving them in the tank would be bad for certain types of rubber o-rings, seals and various plastics. John can confirm, but recent fuels don't have this problem and are safe to leave in the tank from race to race or weekend to weekend. Because fuels are inherently hygroscopic (meaning they pull water from surrounding evinronments) due to ethanols/methanols used, it's a good idea not to leave fuel in a tank for any extended amount of time, but not for the same reason as fuels attacking seals and o-rings. This answer is 4-stroke specific as 2-strokes sometimes depend on the oil's ability to mix with (and stay mixed with) with the fuel.
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Last edited by mekrew; 04-28-2009 at 02:17 PM.
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Old 04-28-2009, 01:47 PM   #9
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The old VP U4, was unsafe to leave in the tank for long periods of time. VP even stated this warning. Then they developed VP U4.2, this fuel is safe to leave in your tank as it does not corrode like the old stuff.
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Old 04-28-2009, 03:00 PM   #10
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There's few things in life that I am absolutely sure of.

1 of them is the fact that I'm not faster on the track is has nothing to do with me running good old fashioned pump gas...
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Old 04-28-2009, 03:07 PM   #11
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Great information. Thank you!!
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Old 04-28-2009, 03:43 PM   #12
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I often run one gallon of race fuel to 4 gallons of gas, just b/c i like the smell. is this good or bad or doesnt matter/ i know I have an addiction so leave me alone
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Old 04-28-2009, 03:47 PM   #13
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I LOVE the smell of U4

best smelling gas around imo lol.
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Old 04-28-2009, 06:29 PM   #14
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Old 04-28-2009, 07:38 PM   #15
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I ran 93 octane pump gas in my twin turbo LT1 at 16 psi with no issues.

Like guitarman said, you only need an octane rating high enough to inhibit detonation. Too slow a burn can be as bad as too quick, at least in the power production end.

Granted it smells good, but unless you find some unleaded race gas, the leaded versions can add their own set of problems.

Plus the pump blends have more oxygen in them, which usually will give a hotter burn and add a little power.
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