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05-23-2012, 06:47 AM
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Join Date: Aug 2010
Location: Rochester, NY
Posts: 174
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A few of the guys in our chapter use the 1 gal of 100 LL to 5 gal 87 octane mogas strategy. There's nothing wrong with it.
Coming from a motorsports background I've been suggesting this product: http://torcoracefuel.net/pro-accelerator.html.
Unlike the "octane boosters" you find on the shelf at your local O'reilly Napazone, this stuff actually does increase the detonation resistance of the fuel. I first ran into this stuff on the rally circuit. Guys were using pump gas to make race fuel with it to put into their very expensive, very high compression ratio rally cars.
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05-23-2012, 08:40 AM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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$20/qt
My experience is that many of the octaine boosters as so expensive that you're better off adding some 100LL as suggested. I think you'll acheive the same result for a lot less $$. The EtOH is another story...
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05-23-2012, 09:47 AM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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Be Very Careful!!!!!!!!!!
...Many or most of the octane boosters contain chemicals like toluene, tulitane, ethane, naphtha, acetone, Xylene, Methyl-tertiary-butyl-ether, Methanol or Isopropyl alcohol as well as a vast array of other compounds. Aside from most of these dangerously lowering the vapor pressure, being very expensive to use and having very little effect on octane (2 to 3 points at best). The part you really need to be most concerned with is there ability to soften, remove or destroy your tank sealant, as I have had this problem in the past. If you decide you want to do this, here is the formula for what we found on the Dyno to work as well or better than all commercially available products we tested and at a fraction of the cost. Best all, Allan.... 
...How to make your own octane booster (this is the basic formula of one of the popular octane booster products). To make eight 16 ounce bottles (128 oz = 1 gal):
100 oz of toulene for octane boost
25 oz of mineral spirits (cleaning agent)
3 oz of transmission fluid (lubricating agent)
This product is advertised as "octane booster with cleaning agent *and* lubricating agent!". Diesel fuel or kerosene can be substituted for mineral spirits and light turbine oil can be substituted for transmission fluid.
.....Disclaimer: this intellectual property is offered to users at no charge. Use it at your own risk. The Anti-Splat-Aero LLC is is not responsible for any damage or problems associated with use of this information. This information is for use by owners on their own personal vehicles and may not be used for profit or sale.
__________________
Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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05-23-2012, 11:15 AM
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Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
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Thanks Allan,
You actually measured an incraese in octance using this mixture?..How did you actually measure detonation resistance?
Where does one buy toulene?
Frank
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05-23-2012, 11:39 AM
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Join Date: Aug 2011
Location: Austin TX
Posts: 347
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just found some on google, 65$ for 5 gal.
Quote:
Originally Posted by frankh
Thanks Allan,
You actually measured an incraese in octance using this mixture?..How did you actually measure detonation resistance?
Where does one buy toulene?
Frank
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05-23-2012, 11:40 AM
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Join Date: Oct 2005
Posts: 1,516
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I want to know more.
Please tell us more Allen.
Thanks.
__________________
Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 600 plus hours
Running on E10 mogas
Don't believe everything you know.
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05-23-2012, 02:49 PM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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Quote:
Originally Posted by frankh
Thanks Allan,
You actually measured an incraese in octance using this mixture?..How did you actually measure detonation resistance?
Where does one buy toulene?
Frank
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...In the dyno cell we have knock sensors integrated with our information gathering system that record detonation and its intensity. When the engines are under load it is relatively simple to alter timing in very small steps to check the engines detonation threshold. I used Francisco fuels to purchase most of this type of product in the past. I think they are now out of business here in California due to EPA and whatnot. I am sure a search will produce some sources. Allan.... 
__________________
Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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05-24-2012, 02:35 PM
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Join Date: Nov 2006
Location: Boise, ID
Posts: 1,095
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Allan,
Thanks a bunch for that information! That is more than I expected. I think it would also be helpful to know how much to add to your gas tank. Would it be one 12 oz. bottle per tank of 87 Octane auto fuel?
Just to be clear, this formula works well with the parts in our RV fuel systems, correct? Toulene, for example, won't eat my mechanical fuel pump seals like ethanol will?
edit: One quick follow up...I'm also interested in whether you have a quantified increase in octane rating. I'm very curious as to what my "new" octane rating would be after adding 12 oz (for example) to a wing-full of 87 Octane.
__________________
Sonny W
Boise, Idaho
RV-7A Flying!
Last edited by lostpilot28 : 05-24-2012 at 02:37 PM.
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05-24-2012, 05:04 PM
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Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,766
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Diesel is very counter productive to octane rating as is oil. You want the octane increase, stick with straight toluene which is a major component is most race gasolines. 20-25% 100LL is a lot easier, safer, cheaper and convenient though. Plenty of solvent action in toluene as well.
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06-21-2012, 09:37 AM
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Join Date: Jan 2005
Location: Sedona Arizona
Posts: 349
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Other than what I have read above regarding the effect of the first small amounts of lead, the effect of other octane boosters is simply based on the ratio of the added fuel or other additive.
I notice on the advertisements on the sides of the miracle octane boosters that they do not say how much that small bottle of stuff will increase the octane of a tank of gas. I think Not Much!
Check out the octane calculators available online to make sure your mixture will provide the octane rating needed for your engine.
I studied this stuff for awhile and came to the same conclusions as Ross. That is the best octane booster available to us is 100LL.
Toluene is 114 octane but availability, cost, and potential harm to components easily rule it out in favor of 100LL.
The idea of purchasing lead as a sepaarate additive is interesting though...
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