Home Brew Octane boosters
Posted 06 December 2006 - 02:55 PM
TOLUENE - Some Basic Questions.
Q: Will my car benefit from octane boosting?
A: Consumer organizations have effectively emphasized the larger markups that oil companies charge for high octane gasoline, implying that for most vehicles higher octane fuel is a complete waste of money. It has been quite a long time since the consumer alert was issued. Since then engine technology has evolved greatly, while people's perceptions generally have not.
Modern vehicles now use computerized engine management systems that can react to engine knock and retard ignition timing if low octane fuel is being used. Consequently cars are now being manufactured with very high compression ratios that appear to give good fuel economy and at the same time good performance. This combination does assume that fuel of adequate octane is being used.
Q: Why bother to boost octane at all since my engine can run just fine on lower octane fuel?
A: For a high compression engine to run on low octane fuel, the engine management system will need to retard the ignition timing to prevent preignition or pinging. Retarding the ignition timing means that the firing of the spark plug is delayed until a later moment in the compression stroke. It does not take much to see that a later onset of combustion means that the combustion is less complete, which in turn mean less power and poorer fuel economy. It is possible that the casual driver will still come out ahead in terms of saving money by using low octane fuel, but the retarded ignition advance also means a rougher running engine and a much duller throttle response. Thus octane boosting is not necessarily of interest to all motorists but rather the enthusiasts.
For turbocharged or supercharged engines, insufficient octane will also lead the engine management system to curtail the amount of boost which in turn defeats the purpose of these engines.
Q: How did you discover using toluene?
A: Sometime ago I came across a web page that described various DIY home brew octane booster formulas. One of which used toluene as its main ingredient. As a Formula 1 racing fan of many years, I recalled that toluene was used extensively in the turbo era in the 1980s by all the Formula 1 teams. The 1.5 liter turbocharged engines ran as much as 5 bars of boost (73 psi) in qualifying and 4 bars (59 psi) in the actual race. Power output exceeded 1500bhp, which translates into 1000bhp/liter, an astronomical figure.
A motorsports journalist, Ian Bamsey, was able to obtain Honda's cooperation for his book "McLaren Honda Turbo, a Technical Appraisal". The book documents the key role that the toluene fuel played in allowing these tiny engines to run so much turbo boost without detonation. The term "rocket fuel" originated from the Formula 1 fraternity as an affectionate nickname to describe its devastating potency. Thus I concluded that I should focus my research on using toluene for my octane boosting project.
Individuals with good long term memory will recall that when unleaded gasoline was first introduced, only low octane grades were available. While it is not entirely clear that high octane super unleaded gas came about as a result of the advances in fuel technology in Formula 1, there is every reason to suspect that this is indeed the case, since many of the major oil companies were involved in the escalating race to develop increasingly potent racing fuel during this era.
Q: Why do you think toluene is better than other types of octane boosters?
A: Several reasons:
Mindful of the evil reputation of octane boosters in general, toluene is a very safe choice because it is one of the main octane boosters used by oil companies in producing ordinary gasoline of all grades. Thus if toluene is indeed harmful to your engine as feared, your engine would have disintegrated long, long ago since ordinary pump gasoline can contain as much as 50% aromatic hydrocarbons.
Toluene is a pure hydrocarbon (C7H8). i.e. it contains only hydrogen and carbon atoms. It belongs to a particular category of hydrocarbons called aromatic hydrocarbons. Complete combustion of toluene yields CO2 and H2O. This fact ensures that the entire emission control system such as the catalyst and oxygen sensor of your car is unaffected. There are no metallic compounds (lead, magnesium etc), no nitro compounds and no oxygen atoms in toluene. It is made up of exactly the same ingredients as ordinary gasoline. In fact it is one of the main ingredients of gasoline.
Toluene has a RON octane rating of 121 and a MON rating of 107, leading to a (R+M)/2 rating of 114. (R+M)/2 is how ordinary fuels are rated in the US. Note that toluene has a sensitivity rating of 121-107=14. This compares favorably with alcohols which have sensitivities in the 20-30 range. The more sensitive a fuel is the more its performance degrades under load. Toluene's low sensitivity means that it is an excellent fuel for a heavily loaded engine.
Toluene is denser than ordinary gasoline (0.87 g/mL vs. 0.72-0.74) and contains more energy per unit volume. Thus combustion of toluene leads to more energy being liberated and thus more power generated. This is in contrast to oxygenated octane boosters like ethanol or MTBE which contain less energy per unit volume compared to gasoline. The higher heating value of toluene also means that the exhaust gases contain more kinetic energy, which in turn means that there is more energy to drive turbocharger vanes. In practical terms this is experienced as a faster onset of turbo boost.
Chevron's published composition of 100 octane aviation fuel shows that toluene comprises up to 14% alone and is the predominant aromatic hydrocarbon. Unfortunately composition specifications for automotive gasoline is harder to pin down due to constantly changing requirements.
Chevron's web site also describes the problems of ethanol being used in gasoline.
MTBE(Methyl-tertiary-butyl-ether) was heavily touted as a clean additive several years ago, and became a key ingredient in reformulated gasoline that is sold in California. But recently new studies arose that showed that MTBE was far more toxic than previously imagined. Organizations such as oxybusters have formed around the country to eliminate the use of MTBE in gasoline and several states, including California have passed new laws to eventually outlaw MTBE.
Q: Why not simply use racing gasoline or aviation fuel?
A1: Most types of aviation fuel have very high lead content, which would rule out cars equipped with catalytic converters. Most piston engined aircraft burn leaded fuel. Also aviation fuel has a very different hydrocarbon mix to optimize volatility properties at high altitude.
A2: Racing gasoline could be a much more convenient way to run high octane fuel compared to having to constantly mix in toluene with each fill up. There are, however a few caveats:
You don't know for sure if you are really getting what is being advertised. You should find out if the fuel inspectors verify the actual octane of the racing gasoline in addition to ordinary gasoline. If you paid $3/gallon and only got 94 or 95 octane instead of 100 octane you may conclude erroneously that your car does not benefit from octane boosting.
You don't know what octane boosters are used in the racing gasoline. The worst case scenario is buying leaded racing gasoline without knowing it. Unleaded racing gasoline may still contain damaging octane boosters like MMT or methanol. A very high alcohol content will lead to fuel line erosion, accelerated fuel pump wear, very poor fuel economy and possibly lower performance, as alcohols have a less impressive MON rating than aromatics.
It takes smaller quantities of toluene to achieve the same octane boost compared to 100 octane racing gas. I have not seen unleaded racing gas for sale that exceeds the octane rating of toluene.
Since toluene is not officially sold as a fuel, gas taxes do not apply. Also racing gasoline tend to have higher markups being of interest to the performance minded enthusiast and thus is very likely to be more expensive to buy and use long term than toluene, which is typically used in more mundane applications like paint thinner.
Q: Will toluene damage my engine or other parts of my car?
A: A 5 or 10% increase in the aromatic content of gas will most likely be well within the refining specifications of gasoline defined by ASTM D4814, which specify an aromatic content of between 20% and 45%. What this means is that if the 92 octane gas that you started off with had an aromatic content of say 30% and you increased it by 10% to 40% you would still be left with a mix that meets the industry definition of gasoline. So the above question would amount to: "Will gasoline damage my engine or other parts of my car?"
Even in the unlikely event that the 92 octane gas has a aromatic content of 45% the resulting mix would still be within the bounds of gasoline sold in other countries.
Q: Isn't toluene an extremely toxic substance?
A: The common perception of toluene's toxicity far exceeds reality. Fortunately there is an ample body of information available that specifically addresses this question. Toluene is more toxic than gasoline but it is certainly not agent orange or cyanide. See the Agency for Toxic Substances link below in the reference section.
Mobil's spec sheet for toluene even goes as far as saying that "Based on available toxicological information, it has been determined that this product poses no significant health risk when used and handled properly."
Q: Isn't toluene an active ingredient of TNT (trinitrotoluene) and is thus deadly?
A: In the same way that cotton wool is the base ingredient of nitrocellulose (guncotton) which in turn is the main ingredient in modern smokeless gunpowder. Using this reasoning one could conclude that cotton wool is a deadly substance. This question reflects a poor understanding of basic chemistry but unfortunately it has been asked often enough.
Q: Can I just dump in 100% toluene into the tank like the F1 racers? vroom vroom vroom
A: First of all, the F1 racers did not use 100% toluene, but 84%. The other 16% in their brew is n-heptane, which has an octane rating of zero. The reason for this strange combination is because the F1 rocket fuel was limited to the rules to being of 102 RON octane. The n-heptane is "filler" to make the fuel comply with the rules.
Because toluene is such an effective anti knock fuel it also means that it is more difficult to ignite at low temperatures. The Formula 1 cars that ran on 84% toluene needed to have hot radiator air diverted to heat its fuel tank to 70C to assist its vaporization. Thus too strong a concentration of toluene will lead to poor cold start and running characteristics. I recommend that the concentration of toluene used to not exceed what the engine is capable of utilizing. i.e. Experiment with small increases in concentration until you can no longer detect an improvement.
Q: Ok, what is the catch?
A: It should be mentioned that in the US, efforts are underway to reduce the aromatic content of gasolines in general as a higher aromatic content leads to higher benzene emissions. Benzene is an extremely toxic substance. However it should also be noted that the proportions that is being discussed in this FAQ is relatively small and in the grand scheme of things is probably insignificant. Moreover, the industrial standard for defining gasoline composition allows plenty of leeway in aromatic content and the proportions present in US gas is already lower than most other countries. I therefore feel that the information provided here is useful to a performance minded car enthusiast while not being significantly detrimental to the environment.
Links on toluene
http://www.icisprici... ... oluene.pdf
Posted 06 December 2006 - 02:57 PM
It's Typed Version of the Article:
Octane boosters are popular in the performance scene because they often regain power last through detonation. Sold for around $25 in a handy bottle, theyâ€™re a convenient fuel additive and horsepower helper. But with so much brands on the market, you may be fooled into thinking theyâ€™re all as effective as each other. Which theyâ€™re not! Differing chemical compounds, additives and even volumes, mixed in with a good percentage of advertising, â€˜independent" testing and testimonials all conspire to confuse the consumer away from the single most important paint: does it improve the octane rating?
Letâ€™s see whatâ€™s worth it in octane boosters.
DO I NEED AN OCTANE BOOSTER?
The boys at "The Macquarie Library" describe detonation as: "Excessively rapid burning of the fuel mixture, often caused by auto-ignition due to excessive temperatures in the combustion chamber, incorrect ignition timing, lean mixtures, too high a compression ratio or unsuitable fuel," â€“ as in too-low an octane rating.
Heard as a faint, metallic rattle, detonation is accompanied by a loss of power and can cause serious damage to piston crowns.
The significance of detonation is such that many companies produce fuel additives designed to increase the inherent octane rating of a given fuel. The proliferation of octane boosters has in part come about in recent times thanks to low quality Australian fuels. White or "Super" leaded fuel has been reduced from 98 to 95-96 octane, Premium Unleaded has also dropped to a minimum of 95 octane. And this presents a problem for high-performance cars designed to run on higher octane European or 100 octane Japanese fuel. Japanese import performance cars, Subaruâ€™s STI WRX for example, runs an ECU program for 100 octane, but sometimes detonates on our Australian PULP.
All engines are different though and with Hondaâ€™s S2000 2.0-litre engine running a high 11.0:1 compression ratio, it relies on advanced engine management as much as quality fuel. But it can sustain its power on PULP. And of course any turbo owner who has experimented with boost will know if you run too much, it will detonate, so improving the octane is vital for maximum performance.
We must state that unless an engine is detonation through low RON fuel, octane boosters have little use. However, in a turbo or high compression application, the inclusion of a better grade of fuel allows the engine management system to optimize ignition timing and fueling.
For this test we tracked down nine different makes and models of octane boosters, two fuel "additive," a straight race fuel and a drum of Toluene. Where there were several different "levels" of octane boosters in the one brand, we chose the strongest version.
The biggest claims the bottles have is the amount of "points" they claim to increase. This is ambiguous as a "point" can relate to either 1.0 RON (Research Octane Number) octane points, or 0.1RON octane points.
The list of entrants in our octane Olympics included:
STP Octane Booster
Wynns Octane 10+ Power Booster,
Amsoil Series 2000 Octane Boost,
Super 104+ Octane Booster,
VP C5 Fuel Additive,
ELF HTX 330 Racing Fuel Stabilizer,
Nulon Pro Strength Octane Booster,
PowerFuel Super Street Nitro Based,
PowerFuel Max Race Nitro Based,
NF Octane Booster Racing Formula,
NOS Octane Booster Racing Formula,
VP Motorsport 103 Unleaded Racing Fuel
To conduct these tests we contracted independent laboratory Intertek Testing Services, who would test our products on a knock engine.
We had to also find a base fuel to add our boosters to so we went to the closest public petrol station, a Shell on the outward-bound side of the Westgate Bridge in Melbourne.
Being a performance-based test, we chose premium unleaded fuel as this represents the most common high performance fuel (ie: if you start with regular unleaded, youâ€™re wasting money!). We should add that "some" boosters would have improved the octane rating of regular unleaded proportionately more than our tests with PULP.
With a RON rating at a minimum of 95, we first established the exact octane of the PULP. The biggest surprise was our randomly select Shell resulted in a quite high 96-8 RON.
We precisely measured and mixed each additive to the PULP, according to each manufacturerâ€™s recommendations and specs and poured each into the knock engineâ€™s tank. The compression ratio was then slowly increased until it started to knock, gaining a threshold of detonation and subsequently a maximum RON rating.
Of less importance but still worth mentioning is the design of the bottles: since most people will be pouring it straight into a tank, the design of a bottle is important to prevent any spillage on paintwork causing damage.
So letâ€™s look at the results!
BASELINE OCTANE 96.8
Itâ€™s very easy to confuse octane ratings as there are a number of separate international standards. MON (Motor Octane Number) is the number derived from a fuel when itâ€™s applied to a test engine run at 3000rpm rather than 600rpm and higher inlet temps and ignition advance. The Australian importer of 104+, Andrew Holdsworth, suggested MON is seen as a more real-world test.
Though none of the fuel companies promote the MON figure which is normally between 7 and 10 numbers less than RON (Research Octane Number).
Intertekâ€™s Graeme Marks believes RON provides the general public with an idea of which additive works more effectively. And being the most commonly-used reference, weâ€™ve used RON for all our tests.
PowerFuel Super Street Nitro Based
946ml treats 35 litres RRP: $35
Right from the start, we were told PowerFuelâ€™s additives werenâ€™t necessarily octane boosters, but horsepower helpers. We kept this in mind when testing both the products, but of the two only the Super Street claimed it was specifically designed to increase the octane rating of PULP. With a 20-percent nitro mix, Super Street Nitro-Based still improved octane ever so slightly (0.2RON) but the real test for these two would come on the dyno runs.
OCTANE IMPROVEMENT: 97.0 (+0.2 RON)
PowerFuel MaxRace Nitro Based
946ml treats 35 litres RRP: $45
Containing another 15 percent more nitromethane than the SuperStreet formula, MaxRace doesnâ€™t claim to increase octane, but the verbal recommendation was the same, ie: its main characteristic is to boost horsepower, not octane. For a fair comparison of these two additives, you need to look at the power they produce. As for octane, it proved very similar toe the SuperStreet formula bumping up octane ever so slightly.
OCTANE IMPROVEMENT: 97.0 (+0.2 RON)
STP Octane Booster
350ml treats 57 litres RRP: $10.95
One of the cheapest of the group, the STP was also one of the hardest to find. Auto stores either didnâ€™t stock it, or had simply run out! Claiming to increase the octane 2-5 points, in a well-designed-for-pouring bottle, the STP â€“ used in the ratio determined by the label - improved the octane marginally by just over half a point. A little disappointing unless you interpret STPâ€™s claim actually meant 0.2-0.5 points. Then itâ€™s a good result!
OCTANE IMPROVEMENT: 97.4 (+0.6 RON)
Wynns Octane 10+ Power Booster
325ml treats 60 litres RRP: $10
The Wynns was the cheapest of the lot and claimed an increase between two and five points, again not actually listing what a "point" related to. Strangely though the 10+ could indicate 1RON and if this is the case going by our tests it almost lived up to its name. It didnâ€™t quite live up to its claims however, increasing the octane rating by 0.8RON.
OCTANE IMPROVEMENT: 97.6 (+0.8 RON)
Super 104+ Octane Boost
473ml treats 83 litres RRP: $25.95
The acknowledged winner of all previous testing in this country, Super 104+â€™s bottle stated we should expect an increase between four and seven point. With a new formula introduced about 12 months ago, identified by an "Eagle" logo on the back of the bottle, the Super 104+ seems to have lost its edge with a marginal gain of just less than 1.0RON.
OCTANE IMPROVEMENT: 97.5 (+0.9 RON)
VP Racing C5
355ml treats 75 litres RRP: $19.95
VP has a strong reputation with fuels and its high octane formulas are very popular (VP?) with drag racers. VP Racingâ€™s C5 Fuel Additive lacked any indication of contents nor claims, but the C5 additive still provided a reasonable increase of 1.3RON.
OCTANE IMPROVEMENT: 98.1 (+1.3 RON)
NOS Octane Booster Racing Formula
355ml treats 60 litres RRP: $28
NOS, a relatively new octane booster, comes in "1/10th" scale bottles designed to emulate the actual nitrous bottles of its successful NOS systems. The Racing Formula is the strongest of three concentrates and containing Hydrotreated Aliphatics and Methylcyclopentadienyl Manganese Tricarbonyl (try saying that 10 times in a row), it contains a lead replacement which NOS claims increases the octane rating by as much as seven points. Obviously not recommended for street use, it also included with a handy pouring spout. In testing, it proved a good result improving the octane rating by almost 2RON.
OCTANE IMPROVEMENT: 98.6 (+1.8 RON) as much as 7 points
Posted 06 December 2006 - 03:01 PM
ELF 330 Fuel Stabilizer
1000ml treats 50 litres RRP: $45
"If you spill it on your paintwork, donâ€™t rub it off â€“ rinse it with water" were our works of warning. We were also told to "pre-mix" the ELF before adding it in a fuel tank (which with this test we were doing anyway) as the ELF has a tendency to settle to the bottom of fuel if itâ€™s either not mixed properly or left to sit. This was made somewhat more difficult by the design of the bottle, which tends to drip when pouring. With some nasty stuff known as Aniline, the ELF doesnâ€™t claim any numbers, and provided a decent 1.8 RON point improvement.
OCTANE IMPROVEMENT: 98.6 (+1.8 RON)
Amsoil Series 2000 Octane Boost
354ml treats 57 litres RRP: $23
Recommended for off-road and racing use, the Amsoil Series 2000 claimed to increase the octane rating by up to seven points. It came up a little short, but still proved surprisingly good with a full 2.0RON improvement. And good enough for the bronze medal in our Octane Booster Olympics.
OCTANE IMPROVEMENT: 98.8 (+2.0 RON)
20 litres treats 100 litres RRP: $48
Since toluene (pronounced toll-you-een â€“ also known as methyl benzine) isnâ€™t a commercially advertised octane booster. We were unsure of exactly what ratio to mix the clear Toluene to the fuel, with recommendations between 10 and 30 percent. From personal experience, we have seen high percentages increase octane even further, though 30 percent is considered the maximum. Available only from various fuel distributors (it is a special order through services stations), under advice we ran a 20 percent mix (quite a lot more than the others) and saw an impressive improvement of 2.5 RON, for the silver medal.
OCTANE IMPROVEMENT: 99.3 (+2.5 RON)
NF Octane Booster Racing Formula
250 ml treats 80 litres RRP: $29.95
Time for an Aussie-made product. From Perth, the NF Octane Booster Racing Formula was the smallest bottle in the field, but looking at the mixing ratio, also the strongest NF relies on an incredibly small dose â€“ a mere 3 percent! Claiming to increase octane as much as 6.0 RON, NF took the gold medal in a surprising tie. If it were a split decision based on concentration though, it would be the clear winner.
OCTANE IMPROVEMENT: 99.6 (+2.8 RON)
Nulon Pro Strength Octane Booster
500 ml treats 60 litres RRP: $20.95
Note: Also available in four-litre container for $110
The Australian-made Nulon Pro Strength Octane Booster is the top of the range Nulon fuel product, claiming to boost octane "up to seven number". The Pro Strength gained a test-winning, gold-medal-gaining and Nf-equalling 2.8RON increase. And at $21, itâ€™s good value too!
OCTANE IMPROVEMENT: 99.6 (+2.8 RON)
VP Motorsport 103 fuel
Used straight fuel (20-litre minimum) RRP: $70
Purely for interest, we decided to also test a straight racing fuel. While there are a number available (such as ELF) for no particular reason we chose VP. The highest octane VP fuel which was still totally street-legal was the Motorsport 103. Working out at $3.50 per litre and "designed for maximum power and throttle response", the VP was very impressive with an octane rating of 107RON â€“ more than 10RON points more than PULP. Obviously more expensive than the boosters, if octane is problem, racing fuel like VP may be the answer.
OCTANE IMPROVEMENT: 107 (+10.2RON)
As the name suggests, a knock engine is designed to test the detonation or anti-knock rating of fuels and fuel additives. Itâ€™s a slow revving engine capable of running most fossil fuels through an adjustable compression ratio. As the comp ratio increases, it accurately measures the intensity of the knock and determines the fuelâ€™s octane rating.
The world standard is a one-cylinder two-valve four-stroke engine with exposed valve gear. Archaic in appearance, a carby is fed from any one of three fuel bowls to allow three different fuels to be run back to back. The mixture is actually controlled via gravity feed and by raising or lowering the float level of each bowl!
Run under load via a belt-drive linking the flywheel and load system, it ensures a real world situation and ensuring minimal variation between tests, oil temperature, intake air density and air temperature are all monitored and controlled.
The engine is somewhat agricultural, however its unique ability to vary the compression ratio while running between 5.0:1 and 15.0:1 is quite amazing. The operator simply winds a handle and the entire head and cylinder assembly moves up and down relative to the crankshaft.
A knock sensor measures both the frequency and intensity of the ping (as displayed on a knock metre). Figures are then cross-referenced on a chart using the information provided by the knock meter, plus the height of the head and barrel.
Finally, knock intensity is figured in and the fuelâ€™s octane rating determined.
Taking two hours to warm, this $200,000 engine is super robust and rarely needs rebuilding. Individual tests can then proceed at approximately $120 per test sample.
Being subjected to so much detonation, you can only imagine how much maintenance an engine of this nature must need. Interestingly, this isnâ€™t the case as the piston and rod assembly are rejects from a monstrous ship engine (just kidding)! Theyâ€™re frigging huge with the incredibly thick piston crown contributing to a combined gudgeon pin and piston weight of 1794 grams! Likewise, the rod weighs an astonishing 1929 grams. The bottom line is these engines which have replacement value of over $200,000 and almost never require rebuilding.
Ultimately, the role of an octane booster, is to regain horsepower lost through detonation or ******ed ignition timing due to detonation. But two of our products, the nitro additives, werenâ€™t specifically designed to increase octane. Instead, they contain a mix of nitromethane (the petrol Top Fuellers run) in a "percentage" concentrate. Power Fuelâ€™s Super Street and Max Race additives has 20-percent and 35-percent nitro respectively, and the Australian importer specifically claimed they would increase power, not necessarily octane.
So, we took those two products, and the two best-performing octane boosters to MRT Performance for some Dyno Dynamics dyno testing. Interestingly, we were going to use MRTâ€™s rally Civic, which normally runs on avgas. On PULP â€“ even with the booster â€“ it was pinging too much, so a Jap-spec EF Honda Civic was used with a 1.6-litre VTEC and about 10.0:1 comp ratio.
The graphs tell the story though, and to be fair to the products, with variables such as heat soak, the results werenâ€™t as conclusive as could be gained from an engine dyno. But that is not to say the products donâ€™t work. As our test prove, they do, but itâ€™s not as easily measured on a chassis dyno. Plus the Civic had no detonation problems on PULP, further hampering the "apparent" effectiveness of the boosters.
With changes too small to accurately measure, we would suggest if your engine is sensitive to octane, a booster is for you. If not, try the nitro or racing fuels.
Both the Nulon Pro Strength and the NF Racing Formula rated the best octane boosters in our test. And considering that less NF was needed than Nulon, it evens out a little with a slightly higher cost. Still, both proved extremely effective at increasing octane, even outranking Toluene, which needs much higher levels of concentration. The VP Motorsport 103 fuel was an interesting exercise, and if a little more effort (ie: buying it from the selected outlets) is worth the octane, itâ€™s a good representative of what to expect from straight racing fuel. As for the nitro additives, if youâ€™re not experiencing any type of detonation, theyâ€™re definitely worth a try. So whether you detonate or not, weâ€™ve found a fuel additive for you!
Material courtesy of Fast Fours Magazine Nov/Dec 1999.
Posted 06 December 2006 - 03:08 PM
Mixtures with 92 Octane Premium
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.
Mixtures with 92 Octane Premium
Notes: Similar to Toulene. 12-16 ounces will only raise octane 2-3 *points*, I.e. from 92 to 92.3. Usually mixed with Toulene and advertised as *race formula*.
Mixtures with 92 Octane Premium
Notes: Oxygenate. Very common in octane booster products. Has lower BTU content than toulene or xylene, but oxygenate effect makes the gasoline burn better and produce more energy.
Methanol or Ethanol
Cost...$0.60 - $1.75/gal
Mixtures with 92 Octane Premium
10%...94.3 Octane (Methanol)
10%...94.7 Octane (Ethanol)
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", combines with water.
Isopropyl Alcohol and Tertiary Butyl Alcohol
Mixtures with 92 Octane Premium
Notes: Similar to Methanol/Ethanol. Isopropyl Alcohol is simply rubbing alcohol.
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