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A Good Octane Boost?

A Good Octane Boost?

Old 04-30-2009, 04:56 PM
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Toluene when mixed with pump gas works well as a knock retardant on low to moderate boost applications. It is not a substitute for race fuel or safe to run on high boost applications on pump gas only.
We run 10% toluene to our 93 octane mix up to 8 lbs of boost or so running 565ci inner cooled high helix 14-71s and then inject methanol or run straight race fuel beyond that.

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Old 04-30-2009, 07:50 PM
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Default octane boost.....

Octane boost is almost a scam, or it should be; Example if your running 91.0 octane then add 104+ it will only change the octane rating to like 91.104. This test has been in HOT ROD, and CAR CRAFT magazine many times, the octane is added AFTER the decimal point.
( this has been explained in lamens terms so if anyone has the more tech explenation all comments welcome) So technically it does increase the rating, but you wont ever notice the difference. Ill Say it again " all you cowboys spend tons of cash on bling, then cheap out and skimp on oil, filters and more important- fuel !!

Anyway thats the basics, if I offended anybody well sorry. But it's the truth.
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Old 05-01-2009, 07:19 AM
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Last year I melted a piston, motor builder thought it was fuel. Rebuilt motor to 760 hp, he said 93 may not be quite enough. I have questioned whether I'm always getting 93, so I just want to be sure I stay around 93. What would the maximim octane I could be at and be safe? Thought about adding enough to allow if the fuel would happen to be 89?
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Old 05-01-2009, 07:24 AM
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Originally Posted by boatguy94 View Post
Last year I melted a piston, motor builder thought it was fuel. Rebuilt motor to 760 hp, he said 93 may not be quite enough. I have questioned whether I'm always getting 93, so I just want to be sure I stay around 93. What would the maximim octane I could be at and be safe? Thought about adding enough to allow if the fuel would happen to be 89?
We bump the 93 up to 100 and still start spraying Methanol at 6lbs of boost ... good luck
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Old 05-01-2009, 08:10 AM
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So their is no detrimental effect running toluene up to 30%?
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Old 05-01-2009, 09:58 AM
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TETRAETHYL LEAD

http://www.batterystuff.com/fuel-treatments/OS6q.html

Last edited by Back4More; 05-01-2009 at 10:12 AM.
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Old 05-01-2009, 07:19 PM
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Originally Posted by kennyo View Post
So their is no detrimental effect running toluene up to 30%?
know guys running it for years with no problems,and even spraying it at 9lbs boost plus
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Old 05-01-2009, 10:50 PM
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Found this...
Toluene can be used as an octane booster in gasoline fuels used in internal combustion engines. Toluene at 86% by volume fueled all the turbo Formula 1 teams in the 1980s, first pioneered by the Honda team. The remaining 14% was a "filler" of n-heptane, to reduce the octane to meet Formula 1 fuel restrictions. Toluene at 100% can be used as a fuel for both two-stroke and four-stroke engines; however, due to the density of the fuel and other factors, the fuel does not vaporize easily unless preheated to 70 degrees Celsius (Honda accomplished this in their Formula 1 cars by routing the fuel lines through the muffler system to heat the fuel). Toluene also poses similar problems as alcohol fuels, as it eats through standard rubber fuel lines and has no lubricating properties as standard gasoline does, which can break down fuel pumps and cause upper cylinder bore wear.

Last edited by Back4More; 05-01-2009 at 10:52 PM.
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Old 05-05-2009, 03:43 PM
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I just priced a drum from my local Sherwin Williams. $7.25 a gallon in 55 gallon drum. Has anyone else priced it lately? I can by racing fuel for that kind of money.
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Old 05-05-2009, 04:01 PM
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So what % Toluene would raise 89 octane fuel to 93 octane?
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