
	Where results make sense

Topic: Octane rating

Related Topics

Gasoline

Carburetor

Rating

Octane

Liquified petroleum gas

Physical fitness

Politics of the Philippines

United States

Octane

In the News (Sun 29 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	VP Racing Fuels \| Racing Fuel Ratings
		The octane rating is a measure of the auto ignition resistance of gasoline and other fuels used in spark-ignition internal combustion engines.
		Octane is measured relative to a mixture of isooctane (2,2,4-trimethylpentane, an isomer of octane) and n-heptane.
		The octane rating may also be a "trade name", with the actual figure being higher than the nominal rating.
	www.dmperf.com /fuel_brands_and_octane_ratings.htm (1625 words)

	Fuels and Lubricants, Page 1 of 2
		Simply put, the octane rating of a gasoline is its ability to resist knock, a sharp metallic noise resulting from detonation or uncontrolled combustion in the cylinder.
		If the octane rating is too low, the last part of the compressed fuel/air mixture may ignite before the flame front reaches it, in effect creating two areas of combustion within the cylinder.
		For instance, if the gasoline formerly had a research octane rating of 100, and a motor octane rating of 90, the octane rating found on the pump now would be 95.
	www.procarcare.com /icarumba/resourcecenter/encyclopedia/icar_resourcecenter_encyclopedia_fuels1.asp (2257 words)

	Octane Rating - Thor Racing (Japanese Performance Car Tuning)
		The fuel property the octane ratings measure is the ability of the unburnt end gases to spontaneously ignite under the specified test conditions.
		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.
	www.thor-racing.co.uk /Octane_Rating-149.asp (6579 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)

	10/16/96 - What does the octane rating of gasoline mean?
		Isooctane is defines to have an octane rating of 100, which n-hepatine has an octane rating of 0.
		Octane ratings compare the burning characteristics of gasoline to mixtures of isooctane and n-hepatane.
		Gasoline with an octane rating of 87 burns he same way that a mixture of 87 percent isooctane and 13 percent n-heptane would burn.
	www.pa.msu.edu /~sciencet/ask_st/101696.html (200 words)

	Internet BMW Riders - Octane Rating Systems
		Octane is a general term used to indicated a gasoline's ability to resist engine knock.
		AKI is determined based on an average of the Research Octane Number (RON) and the Motor Octane Number (MON).
		Octane is tested in a single cylinder octane test engine.
	www.ibmwr.org /otech/octane.html (692 words)

	The Low-Down on High Octane Gasoline (Site not responding. Last check: )
		Most gas stations offer three octane grades: regular (usually 87 octane), mid-grade (usually 89 octane) and premium (usually 92 or 93).
		The ratings must be posted on bright yellow stickers on each gasoline pump.
		The octane rating of gasoline marked "premium" or "regular" is not consistent across the country.
	www.ftc.gov /bcp/conline/pubs/autos/octane.htm (687 words)

	Octane rating - Wikipedia, the free encyclopedia
		The octane rating may also be a "trade name", with the actual figure being higher than the nominal rating.
		The octane ratings of n-heptane and iso-octane are exactly 0 and 100, by definition.
		The octane rating was developed by the chemist Russell Marker.
	en.wikipedia.org /wiki/Octane_rating (1786 words)

	Octane vs. Compression vs. Timing (Site not responding. Last check: )
		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.
		Octane is the rating of the fuel's ability to resist abnormal combustion due to heat or pressure.
		Octane has nothing to do with the fuel's ability to make power other than the fact that, properly selected, it allows the engine-builder the use of high-compression, aggressive cam timing and any other trick that elevates cylinder pressure.
	www.diabolicalperformance.com /hotrodoctane.html (2507 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.
		As a rule, high octane gasoline does not outperform regular octane in preventing engine deposits from forming, in removing them, or in cleaning your car's engine.
		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.shtm (687 words)

	Howstuffworks "What does octane mean?"
		The compression ratio of your engine determines the octane rating of the gas you must use in the car.
		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.
	auto.howstuffworks.com /question90.htm (642 words)

	BP Ultimate UK - 102 octane
		The octane number of petrol is a measure of its combustion quality and in particular, its ability to withstand severe operating conditions.
		Each is determined using a standard laboratory rating procedure carried out under separate test parameters to assess the combustion characteristics of the fuel under different engine operating conditions.
		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)

	OCTANE ANALYZER - octane rating & cetane number (Site not responding. Last check: )
		Instant octane rating of motor gasoline, corresponding to motor and research methods (RON and MON) as well as for cetane number of diesel fuels.
		In addition for an inquiries, temperature rating of the analyzed liquid and diesel fuel solidification is provided.
		Octane analyzer has the portable compact design and is used for on-line inspection of motor fuel quality in the field and laboratory conditions.
	www.octanerating.com /octane.htm (432 words)

	Fuel Rating - Octane Comparison — Dyno Tests Graphs — Hot Rod Magazine (Site not responding. Last check: )
		Then we beat it up, making 40 power pulls to see if octane rating has a significant impact on power and if ignition timing can be effectively manipulated to ward off detonation without heavily penalizing output.
		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.
	www.hotrod.com /techarticles/fuel_octane_rating_comparison (2030 words)

	OCTANE RATING QUESTION FOR CHEMISTRY WIZARDS - Page 2 - FerrariChat.com
		I said that the octane rating of a gasoline in itself is not inductive of its energy value, albeit perhaps in not such a clear manner.
		He also insisted that the best performance was to have octane that was high enough to not cause detonation, but that any higher was a waste (again, might not apply to cars with chips that can make use of the higher octane to recalibrate the settings).
		The gasoline is modified with additives to determine the octane mix, not by the refinery.
	ferrarichat.com /forum/showthread.php?p=136222236 (2539 words)

	Handyman USA - Gasoline Octane Rating
		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.
		The research method gives slightly higher ratings, and the octane number displayed on the pumps is an average of the two methods.
		If switching to high octane gasoline does improve mileage, you might find that a tune-up will give you the same improvement on 87 octane gasoline.
	www.handymanusa.com /articles/octane.html (924 words)

	Octane (David J Heisterberg; Bruce Hamilton; Jim Davies; Carl Ijames; John De Armond; Ed Hackett))
		The octane scale is nominally based on n-heptane having a value of 0 and iso-octane having a value of 100 under a given set of conditions.
		The technique for obtaining Blending Octanes is different from rating the pure fuel, which often requires adjustment of the test engine conditions outside the acceptable limits of the rating methods.
		Generally, the actual octanes of the pure fuel are similar for the alkanes, but are up to 30 octane numbers lower than the API Project 45 Blending Octanes for the aromatics and olefins [52].
	yarchive.net /car/octane.html (4726 words)

	Pioneer Petroleum
		The Octane rating of gasoline is a measure of the fuel's ability to resist engine knock, or ping.
		Optimum performance and fuel economy are achieved when the Octane rating of the gasoline is appropriate for the engine of your vehicle.
		Octane requirements also tend to increase on hot days and when barometric pressure is high.
	www.pioneer.ca /gasfacts.asp (510 words)

	High-octane-rating gasolines - Patent 4824552
		Lead-free, regular gasoline rated at 90 or 91 in octane number and marketed in 1975 is known to invite knocking under certain driving conditions.
		Another object of the invention is to provide such a gasoline of high research octane number which has its olefins content held at a selected level, leading to enhanced stability.
		The amount of the fuel component to be added should be in the range of 5 to 40% by volume, preferably 10 to 30% by volume of the total gasoline.
	www.freepatentsonline.com /4824552.html (2290 words)

	Octane Rating (Site not responding. Last check: )
		In a test engine, a fuel that knocks under the same load as a 50/50 mixture of these two compounds would be given an octane rating of 50.
		One additive to gasoline that improves the octane rating of the fuel dramatically is tetraethyl lead.
		In a diesel engine, low octane fuels can be used by taking advantage of their tendency to knock.
	chemistry.csudh.edu /oliver/smt310-handouts/octane/octane.htm (399 words)

	OCTANE RATING QUESTION FOR CHEMISTRY WIZARDS - FerrariChat.com
		Less octane than 91 could mean less performance, as the knock sensor will retard the ignition if it sense pinging from the lower octane fuel.
		The 91 octane is to punish all the flakey libs that live in Cali.
		But since octane costs money, and Californians are conditioned to use 91, it will probably stay the same unless one of the refiners decides for marketing reasons to offer 93 forcing the other to follow.
	ferrarichat.com /forum/showthread.php?p=136205038 (1750 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.
		Since the highest octane rated fuel that was commonly available in Washington state is 92, I decided to investigate long term cost effective octane boosting so that I could fully enjoy the performance that this car offered.
		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.
	www.gnttype.org /techarea/misc/octaneexplained.html (3411 words)

	OCTANE
		Many high performance engine owners use it because of it's high stated octane rating (usually 100-110) and the relatively low price compared to racing fuel.
		Av gas octane is rated on a different scale than gasolines intended for ground level use.
		What is 100 octane "av", is not necessarily 100 octane "ground level".
	www.powroll.com /tech_specs_octane.htm (1137 words)

	About Fuel - Octane Ratings and RON - PetrolPrices.com
		Petrol's octane rating is a measurement of the fuel's ability to resist engine knocking.
		An octane rating is often referred to as an 'anti-knock index'.
		Occasionally, some filling stations will confuse these different octane numbers in a bid to embellish on their octane rating claims, and advertise their fuel's Research Octane Number, which is higher than the Road Octane Number.
	www.petrolprices.com /about-fuel.html (860 words)

	Octane Rating
		Every brand of gasoline has an octane rating or number which indicates its ability to resist knocking.
		When the numbers were first developed, the researchers found that normal heptane (a hydrocarbon) had almost no ability to resist knocking so they gave it an octane number of zero.
		The Motor Octane Number (MON) is obtained when conditions are somewhat severe and give a much lower number than the RON.
	www.basicfiles.com /Octane_Rating.htm (482 words)

	Gasoline Quality vs Octane Rating - RC Groups
		Octane is kind of the last bit if tuning you can do to an engine.
		All octane does is try to control burn of fuel, since combustion is a controlled burn.
		Too little octane and you could have fuel pre-igniting in the intake manifold, where as too much will cause lag and much of the valuable power ends up just going out the exhaust.
	www.rcgroups.com /forums/showthread.php?t=11872 (1126 words)

Try your search on: Qwika (all wikis)