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Topic: Octane

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  Howstuffworks "What does octane mean?"
The compression ratio of your engine determines the octane rating of the gas you must use in the car.
Eighty-seven-octane gasoline is gasoline that contains 87-percent octane and 13-percent heptane (or some other combination of fuels that has the same performance of the 87/13 combination of octane/heptane).
In the case of AvGas, 100 is the gasoline's performance rating, not the percentage of actual octane in the gas.
auto.howstuffworks.com /question90.htm   (642 words)

  octane number. The Columbia Encyclopedia, Sixth Edition. 2001-05
The octane number of a sample of fuel is determined by burning the gasoline in an engine under controlled conditions, e.g., of spark timing, compression, engine speed, and load, until a standard level of knock occurs.
Octane numbers higher than 100 are found by measuring the amount of tetraethyl lead that must be added to pure isooctane to duplicate the knocking of a sample fuel.
The third octane rating, which federal regulations require on commercial gasoline pumps, is an average of research octane and motor octane.
www.bartleby.com /65/oc/octanenu.html   (395 words)

 M-AUDIO - Octane - 8-channel Preamp and A/D Converter with ADAT Lightpipe
The 8-channel Octane preamp is specifically designed to enhance the front end of any multitrack digital recording system.
Octane is ideal for miking drum kits or bands—and the two mic/instrument channels are great for guitar, bass and other instruments.
Octane even has analog preamp (direct) outs for each channel, making it the perfect upgrade for any digital audio interface or mixer.
www.m-audio.com /products/en_us/Octane-main.html   (396 words)

 SuperchargersOnline.com :: The Mystery of 'Octane' Finally Uncovered
An octane rating (87 vs. 89 vs 92, etc.) is a measure of a gasoline's ability to resist detonation, which manifests itself in a pinging or "knocking" noise.
Because of the nature of octane as being resilient to detonation, all fuels are compared to 100% octane as a benchmark fuel, from which an "octane rating"can be obtained.
High octane fuel does not burn cleaner, it does not clean your engine, it does not increase horsepower or torque (unless you are experiencing knock), it does not smell better, it does not increase fuel economy (unless you are experiencing knock) and is not better for the environment.
www.superchargersonline.com /content.asp?id=105   (859 words)

 Octane Information And Calculator
Octane rating number is defined as a value used to indicate the resistance of a motor fuel to knock.
Octane numbers are based on a scale on which isooctane is 100 (minimal knock) and heptane is 0 (bad knock).
The octane number is determined by comparing the characteristics of a gasoline to isooctane (2,2,4-trimethylpentane) and heptane.
www.csgnetwork.com /octaneratecalc.html   (794 words)

 The Low-Down on High Octane Gasoline   (Site not responding. Last check: )
Octane ratings measure a gasoline's ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders.
The octane rating of gasoline marked "premium" or "regular" is not consistent across the country.
One state may require a minimum octane rating of 92 for all premium gasoline, while another may allow 90 octane to be called premium.
www.ftc.gov /bcp/conline/pubs/autos/octane.htm   (687 words)

 Octane   (Site not responding. Last check: )
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www.octanepr.com /site/webpages/services.html   (1289 words)

 Gasoline FAQ - Part 3 of 4
The octane rating of hydrocarbons is determined by the structure of the molecule, with long, straight hydrocarbon chains producing large amounts of easily-autoignitable pre-flame decomposition species, while branched and aromatic hydrocarbons are more resistant.
Octane distribution was seldom a problem with the alkyl lead compounds, as the tetra methyl lead and tetra ethyl lead octane volatility profiles were well characterised, but it can be a major problem for the new, reformulated, low aromatic gasolines, as MTBE boils at 55C, whereas ethanol boils at 78C.
The most significant determinant of octane is the chemical structure of the hydrocarbons and their response to the addition of octane enhancing additives.
www.faqs.org /faqs/autos/gasoline-faq/part3/preamble.html   (4231 words)

 FCC Octane MON Versus RON   (Site not responding. Last check: )
An octane number is a quantitative, but imprecise measure of the maximum compression ratio at which a particular fuel can be utilized in an engine without some of the fuel /air mixture "knocking" or self igniting.
In practice the octane of a gasoline is reported as the average of RON and MON or R+M/2.
The octane benefits are a result of the conversion of low octane n-hexane (RON=24.8) to isohexane (RON=80) and the generation of isopentane (RON=93) and isohexane (RON=80) from the bulk reformer feed.
www.refiningonline.com /EngelhardKB/crep/TCR4_29.htm   (1186 words)

 Howstuffworks "What does octane mean?"
Eighty-seven-octane gasoline is gasoline that contains 87-percent octane and 13-percent heptane (or some other combination of fuels that has the same performance of the 87/13 combination of octane/heptane).
Airplanes are still allowed to use leaded gasoline (known as AvGas), and octane ratings of 100 or more are commonly used in super-high-performance piston airplane engines.
In the case of AvGas, 100 is the gasoline's performance rating, not the percentage of actual octane in the gas.
www.howstuffworks.com /question90.htm   (640 words)

 Wrenching with Rob--Chemical Soup: The Meaning of Gas.
Here's why: Octane, an arbitrary number which is calculated as the average of the Research Octane Number (RON) and the Motor Octane Number (MON), and is only an indic ation of a fuel's sensitivity to knock, which is typically pressure-induced self-ignition.
Octane, as you can see, is not a measure of how much power--or, more correctly, specific energy--is contained in a fuel.
The knock tendency (and hence, the Octane rating) of a fuel is a function of the amount of free radicals present in the fuel prior to ignition and can be reduced by the addition of tetra ethyl lead, aromatics and other additives.
www.motorcycle.com /mo/mcnuts/rt-fuel1.html   (1030 words)

 Octane Production
Assuming you are referring to octane as part of a motor fuel, it is far less expensive to acquire it from oil than it would be to "manufacture" it from other hydrocarbon-based materials.
Octane is just a small structure which can be built by man or nature.
The word "Octane" as applied to gasoline, refers not to the chemical family but to a valued effect of that chemical in the context of high-compression internal-combustion engines.
www.newton.dep.anl.gov /askasci/chem03/chem03287.htm   (739 words)

 Fuel Rating - Octane Comparison — Dyno Tests Graphs — Hot Rod Magazine   (Site not responding. Last check: )
Doubling the dose of octane booster to 4 ounces in the 2-gallon fuel cell (like putting two 16-ounce bottles in a 20-gallon tank), and leaving the timing set at 38, we gained 1.5 hp.
The octane level was not the operative here—rather it was the superior hydrocarbon content and vaporization characteristics of the racing fuel.
Wusz said, “An engine does not know what the octane rating of the fuel is, unless it is too low”; note that we made less power by adding booster to 91-octane fuel.
www.hotrod.com /techarticles/fuel_octane_rating_comparison/index.html   (2030 words)

 Octane   (Site not responding. Last check: )
The octane shortage was confirmed by the sticker on the filler cap that stated that 93 octane fuel was needed.
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.
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.
www.gnttype.org /techarea/misc/octaneexplained.html   (3411 words)

 The Octane Myth
Octane ratings are a measure of a gasoline's ability to resist engine knock.
Remember, octane is nothing more than a measure of anti-knock quality...use the lowest octane fuel which provides you with knock-free operation.
If the octane sticker is missing from the pump, or if you are concerned about the accuracy of a posted octane level, call the bureau of weights and measures in the Suffolk County Executive's Office of Consumer Affairs at 853-5730 to register a complaint or get more information.
www.co.suffolk.ny.us /webtemp3.cfm?dept=3&id=2049   (580 words)

 A Consumer's Guide: Gasoline Octane for Cars   (Site not responding. Last check: )
Octane is a measure of a gasoline's ability to resist knock or pinging noise from an engine.
The stabilized octane requirement may be 3-6 numbers higher than when the car was new.
Modern computer-controlled engines adjust spark timing and air-fuel ratio to compensate for changes in barometric pressure, and thus the effect of altitude on octane requirement is smaller in these vehicles.
www.chevron.com /products/prodserv/fuels/gas_qanda/api_octane.shtml   (678 words)

 Octane: A Simple Walkthrough with the Octane Tester Console
An important part of the Octane toolkit is a standalone utility to help you interact with compression algorithms, and an OctaneTester class to support this utility.
OCTANE v1.01.15 - august 8, 2003 - http://octane.sourceforge.net Commands are case-sensitive (to use as commandline arguments separate with ';') Compression and Decompression 'compress $inputfile [$outputfile]' to compress a file+compressor.
When the Octane tester utility launches it displays a brief list of commands and then lists the 'Registered Compressor Types' (in our case there are 2 compressors registered), as well as any 'Instantiated Compressors' (we start with no compressors instantiated).
octane.sourceforge.net /doxygen/walkthrough.html   (1621 words)

 octaNe - RPG Reviews - GameWyrd   (Site not responding. Last check: )
octaNe has been around for a while and GameWyrd struggles to keep up with the flow of new releases - but sometimes a game is good enough to scroll back, ignore the waiting list and take a look at.
OctaNe is one of those few games where I after reading the PDF I want to go out and buy the print copy.
OctaNe, despite all its homage to cinematic genres, is a genre buster.
www.gamewyrd.com /review/436   (829 words)

 Minnesota Commerce : Gasoline Octane Facts   (Site not responding. Last check: )
A second definition: Octane is a measure of a fuel's tendency to knock or ping when it is mixed with air and burned in the cylinder of an engine.
It is called octane because pure hydrocarbon octane is used as a knock standard, with a rating of 100.
Gasoline is subjected to two testing methods to establish its octane rating: one, called the motor method, runs the gasoline in an engine under load; and a second, the research method, runs the gasoline in a free running engine.
www.state.mn.us /portal/mn/jsp/content.do?contentid=536884591&contenttype=EDITORIAL&hpage=true&agency=Commerce   (698 words)

OCTANe is fueling "innovation development" in Orange County and Southern California.
OCTANe is Orange County's "one-stop" for innovation and entrepreneurship.
OCTANe), Augusta is at the very nucleus of the county’s exploding high-tech scene."
www.octaneoc.org   (156 words)

 BP Ultimate UK - 102 octane   (Site not responding. Last check: )
The octane number of petrol is a measure of its combustion quality and in particular, its ability to withstand severe operating conditions.
High octane fuels resist knock so the higher the octane, the more an engine can be tuned for performance.
The second octane rating is MON – Motor Octane Number – which is a measure of the fuel’s knock resistance at higher speed and under more severe engine conditions.
www.bp.com /sectiongenericarticle.do?categoryId=9009091&contentId=7016856   (349 words)

 What Octane Rating of Gasoline Should I Use?
Octane, by definition, is the resistance to burn or detonation.
So we want to match the correct octane rating of the gasoline to the engine design to ensure complete burning of the gasoline by the engine for maximum fuel economy and clean emissions.
If the vehicle needs a higher octane rating of 89-93, there is documentation in the owner’s manual, as well as possibly under the fuel gauge and by the fuel fill hole.
theserviceadvisor.com /octane.htm   (749 words)

 Octane   (Site not responding. Last check: )
The octane number of a gasoline is NOT a measure of it's hottness or coolness in the burning process, and it is NOT a measure of how 'powerful' it is. The octane number is simply a measure of how good the gasoline is at resisting detonation (knocking/pinging).
Higher octane fuels are better at controlling the decomposition into auto-ignition compounds than lower octane fuels.  They do this in several ways - by interferring with, and reducing the actual decomposition of the fuel, or by chemically reacting with the decomposing gasoline so less auto-ignition compounds are formed.
In conclusion, the octane rating is a measure of the fuel's ability to CONTROL the burning process (to prevent detonation); it is not a function of burning 'hotter' or 'colder'.  And the higher the compression ratio (in the same engine), the higher the octane number needed.
www.geocities.com /vwresource/octane.html   (2339 words)

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