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Homebrew Gasoline Octane Boosters

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Original published in:

GS-Xtra

1213 Gornto Road

Valdosta, GA 31602

(912) 244-0577

Editor: Richard Lasetter, president Gran Sport Club of America (GSCA)

Formula #1 - Toluene

R+M/2.........114

Cost...........$2.50/gal

Mixtures with 92 Octane Premium

10%...........94.2 Octane

20%...........96.4 Octane

30%...........98.6 Octane

Notes: Common ingredient in Octane Boosters in a can. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Often costs $3-5 for 12-16 ounces, when it can be purchased for less than $3/gal at chemical supply houses or paint stores.

Formula #2 - Xylene

R+M/2.........117

Cost...........$2.75/gal

Mixtures with 92 Octane Premium

10%...........94.5 Octane

20%...........97.0 Octane

30%...........99.5 Octane

Notes: Similar to Toluene. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Usually mixed with Toluene and advertised as *race formula*.

Formula #3 - Methyl-tertiary-butyl-ether (MTBE)

R+M/2.........118

Cost...........$3.50/gal

Mixtures with 92 Octane Premium

10%...........94.6 Octane

20%...........97.2 Octane

30%...........99.8 Octane

Notes: Oxygenate. Very common in octane booster products. Has lower BTU content than toluene or xylene, but oxygenate effect makes the gasoline burn better and produce more energy.

Formula #4 - Methanol or Ethanol

R+M/2.........101

Cost...........$0.60 - $1.75/gal

Mixtures with 92 Octane Premium

10%...........94.3 Octane (Methanol)

10%...........94.7 Octane (Ethanol)

20%...........Not Recommended

Notes: Methanol is wood alcohol. Ethanol is grain alcohol and found in Gasohol in 10% ratios. Both alcohols are mildly corrosive and will eat gas tank linings, rubber and aluminum if used in excessive ratios. Main ingredient in "Gas Dryers", combine with water.

Formula #5 - Isopropyl Alcohol and Tertiary Butyl Alcohol

R+M/2.........101

Cost...........$0.60-$1.50/gal

Mixtures with 92 Octane Premium

10%...........94.5 Octane

20%...........Not Recommended

30%...........Not Recommended

Notes: Similar to Methanol/Ethanol. Isopropyl Alcohol is simply rubbing alcohol.

Sample Mixture

To make your own octane booster, it is easiest to make up a large batch, and then bottle it up in "dosage-size" uses.

Below 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 toluene 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. Color can be added with petroleum dyes.🙂

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I didn't see TETRAETHYL LEAD in the home brew menu. This is the additive that made ethyl ETHYL. Boosts octane and provides valve guide lubrication and some say provides a cushion for the valve seat to valve impact.

# TREAT RATES R+M/2

# 0.6Ounces OB-130 to 1 gallon/fuel……….2.0 point octane increase

# 1.2Ounces OB-130 to 1 gallon/fuel……….3.5 point octane increase

# 1.8Ounces OB-130 to 1 gallon/fuel……… 5.0 point octane increase

# 2.4Ounces OB-130 to 1 gallon/fuel……….6.5 point octane increase

# 3.0Ounces OB -130 to 1 gallon/fuel…….…8.0 point octane increase

# 6.0Ounces OB-130 to 1 gallon/fuel……..11.0 point octane increase

# 18Ounces OB-130 to 1 gallon/fuel……..16.0 point octane increase

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So 18 ounces of OB-130 added to 1 gal of 92 octane gas only raises it to 93.6?

13 oz of Toluene raises it to 94.2...

Somethings not right, I think my math is off.

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So 18 ounces of OB-130 added to 1 gal of 92 octane gas only raises it to 93.6?

13 oz of Toluene raises it to 94.2...

Somethings not right, I think my math is off.

18 oz of OB-130 added to 92 octane + 16points = 108 octane

keep in mind that octane is only to suppress knocking ( predetionation). There is no go fast here, only anti knock. You can get knock from a high compression piston. A high compression piston will make you go fast.

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lead also dirties up engine parts, and is not recommended to use, unless you are going to be cleaning your top end alot. it also seems to stick to the 250x's head, so it raises your compression as well :D j/k

you forgot to say, oxygenated fuels, need to be jetted up or they do nothing for you and might even lower your hp output because of the lower btu, but since it has oxygen, it can be run richer with the same air/fuel ratio gaining you power, like a topfuel dragster 🙂:worthy:

I didn't see TETRAETHYL LEAD in the home brew menu. This is the additive that made ethyl ETHYL. Boosts octane and provides valve guide lubrication and some say provides a cushion for the valve seat to valve impact.

# TREAT RATES R+M/2

# 0.6Ounces OB-130 to 1 gallon/fuel……….2.0 point octane increase

# 1.2Ounces OB-130 to 1 gallon/fuel……….3.5 point octane increase

# 1.8Ounces OB-130 to 1 gallon/fuel……… 5.0 point octane increase

# 2.4Ounces OB-130 to 1 gallon/fuel……….6.5 point octane increase

# 3.0Ounces OB -130 to 1 gallon/fuel…….…8.0 point octane increase

# 6.0Ounces OB-130 to 1 gallon/fuel……..11.0 point octane increase

# 18Ounces OB-130 to 1 gallon/fuel……..16.0 point octane increase

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Octane Supreme 130 # OS130

"Boosts octane from 2-16 points when added to fuel."

One point from an octane booster = .1 on the octane rating....:D

I think you've be fooled by the advertising...🙂

If you want to run a leaded fuel go with avgas LL100. Mix one gallon of LL100 with 3-4 gallons of 92 octane gas.

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I was at walmart the other day and saw a bottle of lead additive for gas on the shelf... don't recall the brand or anything...

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VP racing Fuel spec sheet shows lead in some of there fuels,so they like lead.

Have you heard of VP?

Property MR11 MR10 MR9 MR8 MRX01 MR

PRO4.1 C12 U4.2 U2E MS

103 MS

109 MS

109E SB

100

Spec Gravity @ 60ْ F .749 .741 .718 .730 .717 .758 .717 .784 .724 .743 .722 .805 .746

Motor Octane 90 86 87 107 98 89 108 102 98 99 101 99 96

Reid Vapor Press. 9.65 11.47 11.22 6.69 9.73 9.95 7.3 6.32 7.34 2.9 6.17 8.43 6.8

Distillation Fْ - IBP 85.6 95.8 95.9 103.4 94.7 103.0

10% Evap. 117.1 103.8 112.0 144.0 121.5 110.1 131.0 141.6 136.8 190.0 147.0 137.7 148.0

50% Evap. 145.8 128.7 135.9 203.7 151.8 141.4 194.0 174.3 159.7 210.4 167.8 161.8 210.0

90% Evap. 222.4 316.5 240.1 218.0 214.5 319.6 228.0 225.8 262.9 217.1 213.3 309.6 216.0

E.P. 247.6 323.4 328.6 237.3 230.0 346.7 233.3 258.2 389.5 225.7 263.8 364.3 238.0

Lead Yes Yes Yes Yes Yes No Yes Yes Yes No No No No

Oxygenated Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes

Color Yellow Pale Green Clear Yellow Pink Pale

Blue Green Blue Pink Clear Clear Yellow Orange

This did not paste in a Table form, but MR11, MR10, MR9,MR8, MRX01 all have lead

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