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How are SI engine fuels rated?
The octane rating is a measure of the autoignition resistance of gasoline and other fuels used in spark-ignition internal combustion engines. It is a measure of anti-detonation of a gasoline or fuel. Octane number is the number which gives the percentage, by volume, of iso-octane in a mixture of iso-octane and normal heptane, that would have the same anti-knocking capacity as the fuel which is under consideration. For example, gasoline with the same knocking characteristics as a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90. Definition of octane rating The octane rating of a spark ignition engine fuel is the knock resistance (anti-knock rating) compared to a mixture of iso-octane (2,2,4-trimethylpentane, an isomer of octane) and n-heptane. By definition, iso-octane is assigned an octane rating of 100 and heptane is assigned an octane rating of zero. An 87-octane gasoline, for example, possesses the same anti-knock rating of a mixture of 87% (by volume) iso-octane and 13% (by volume) n- heptane. This does not mean, however, that the gasoline actually contains these hydrocarbons in these proportions. It simply means that it has the same autoignition resistance as the described mixture. A high tendency to autoignite, or low octane rating, is undesirable in a spark ignition engine but desirable in a diesel engine. The standard for the combustion quality of diesel fuel is the cetane number. A diesel fuel with a high cetane number has a high tendency to autoignite, as is preferred. It should be noted that octane rating does not relate to the energy content of the fuel (see heating value), nor the speed at which the flame initiated by the spark plug propagates across the cylinder. It is only a measure of the fuel's resistance to autoignition. It is for this reason that one highly branched form, or isomer, of octane (2,2,4- trimethylpentane) has (by definition) an octane rating of 100, whereas n-octane (see octane), which has a linear arrangement of the 8 carbon atoms, has an octane rating of -10, even though the two fuels have exactly the same chemical formula and virtually identical heating values and flame speeds.
What type of fuel can be used instead of diesel in some cars?
Only diesel should be used but in a pinch or emergency kerosene can be used. Diesel is usually number 2 fuel and kerosene is #1 fuel. By the way jet fuel is kerosene. So dont use it in a diesel to often, the higher octane rating could damage the engine over time.
How is the octane rating determined for gasoline?
The octane rating of gasoline is determined by conducting a test called the Research Octane Number (RON) test. This test measures the fuel's resistance to knocking or pinging in an engine. The higher the octane rating, the better the fuel is at resisting premature combustion, which can cause engine damage.
What fuel do trucks have?
93 octane gasoline if it is not a diesel other wise it is a low sulfur diesel.
Could adding jet fuel octane booster to your gas tank cause the car to stall when stopped?
Possibly but fyi most jet fuels are mostly like diesel, i.e. they have a much LOWER octane rating. Avgas is the exception
What are the symptoms of a dirty diesel fuel filter on a Ford Focus?
A ford focus does not have a diesel fuel filter. It runs on regular fuel. Preferably 87 octane
What type of fuel does an 1998 ford F 250 use?
87 octane regular if it is a gasoline engine. Diesel fuel if it has a diesel engine.
What is the octane rating of shell diesel fuel?
It should be listed on the pump. Generally speaking, diesel fuel ignition quality is not measured in octanes, as these are a unit for gasoline. Diesel fuel is measured in cetane not octane.Regular diesel--48Premium diesel--55Biodiesel (B100)--55Biodiesel blend (B20)--50Synthetic diesel--55A label should be affixed to the pump that states both the fuel type and cetane number. It's important to find a station that dispenses fuel of the cetane number recommended by the vehicle manufacturer.
What is the required fuel octane rating to be used in a 2005 Cadillac De Ville?
91 Octane Premium Fuel. Use nothing less or nothing higher.
What is the octane rating for the 2001 ford explorer sport?
Ford recommends regular unleaded for this vehicle. 87 octane fuel.
What is the fuel rating for a 1995 caprice classic?
Use 87 Octane Regular.
What octane is diesel?
Diesel has an octane number of about 15-25. The reason for this seemingly terrible number compared to the ones we're used to from gasoline is the fact that diesel is combusted in a totally different type of engine. Diesel has low volatility, low knock resistance, yet high energy per volume. Because of its low knock resistance, diesel should not be used in a gasoline engine as it will destroy it very quickly and efficiently. Generally speaking, diesel fuel ignition quality is not measured in octanes, as these are a unit for gasoline. A similar reference value, but for diesel, is the cetane rating. The higher the cetane number, the easier the fuel ignites when injected into an engine. The cetane number is determined by an engine test using two reference fuel blends of known cetane numbers. The reference fuels are prepared by blending normal cetane (n-hexadecane), having a value of 100, with heptamethyl nonane, having a value of 15. The higher the cetane rating, the higher the fuel's propensity to knock! Choosing a very high cetane number will not make the car run better, but using a fuel with too low cetane number may prevent the engine from starting or running.
