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Why does a high octane fuel has a less tendency to knock in automobile engine?
Wiki User
∙ 9y ago
because the high octane fuel prevents the igniting of fuel before the starting of engine
Wiki User
∙ 9y ago
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What is octane number?
The amount of resistance that a fuel has to detonation. The higher the number, the less likely it is that a particular fuel will detonate in a particular engine. The number is as compared to a standard fuel (not necessarily gasoline)
Why does chloroform knock you out?
CHCl3 is a anesthetic. We use anesthetics to knock you out.
Is CL from 2NE1 knock-kneed?
CL is not knock-kneed.She walks like ordinary
How long will chloroform knock out someone?
10 minuites
Can you use low test gas on your ls430?
i would like to use either 87 or 89 gas in my Lexus ls 430 not premium gas as manual suggests ? is this 'ok' or will the engine start to ping / knock? we've been using 89 w/no problem. ty.
What causes a engine to knock or ping?
Low octane fuel, timing to far advanced, overheating.
What type of gas should be used in a 2002 Volkswagen Passat?
At least 91 Octane. The higher octane is to prevent engine knock- esp susceptible b/c of the turbocharged engine.
What is meant by the knock range of an engine?
It is the octane number range the distributor automatic spark advance can handle without the engine knocking.
What could be the reason for a small knocking sound in the engine of a 2002 Toyota Highlander?
I own an 02 Highlander, and sometimes I get a knock when engine is under load, like going up a hill or when accelerating. This is engine knock caused by low octane gas. When I use a mid grade or premium octane, I do not get the sound at all. .
Knocking noise when accelerating?
The knocking noise is commonly called spark knock. The knock can be called by the engine timing not being set correctly, or using gas that has too low of an octane for the engine.
Engine knock in a 2.2 Chrysler?
what is the compression ratio and recommended gas octane? try a higher octane fuel and see what happens, mileage may go up also.
Can higher octane gas reduce engine knock or reduce NOx emissions?
It will decrease engine knocking or pinging associated with detonation problems, and will posssibly burn more efficiently. It can, but if a higher octane fuel reduces or gets rid of engine knock and/or ping, I would recommend taking your vehicle to a mechanic for diagnosis. Moreso, if you have a Check Engine Light on even. It's possible that you have some carbon build up in your fuel system that is causing the knock and ping. As far as the Nitrous Oxide Emissions being reduced from higher octane fuel, I have no idea. But most owner's manuals outline which octane to use, and wouldn't recommend swaying from their recommendation.
What is octane number of a fuel?
Many car engines run on gasoline. If the octane is low, the engine will knock. If it is high, the engine will not knock, which means that sometimes it will make a knocking sound as you drive along. It also might keep running when you turn off the key to the car. With high octane, the engine also starts easier. It is more expensive to make high octane fuel. Lower octane fuel gets better milage. There are two organic chemicals: isooctane and heptane. Isooctane is a good fuel for cars. It is rated at 100 octane. Heptane is a bad fuel for cars. It is rated at zero octane. When gasoline is made, they need to make a certain octane. They put the gasoline in a car engine. They then run the car with a mixture of isooctane and heptane. They find the mixture that matches the batch of gasoline. That is the octane rating of the new batch of gasoline.
Why does your 93 Cadillac DeVille knock when the engine is accelerating?
If it is more of a ping than a knock then just try running some higher octane fuel in it. If is more of a knock it could be a rod or crankshaft bearing. If it is definitely a knock you should get it looked at right away.
How do you stop spark knock?
To stop spark knock , try a higher octane fuel. Make sure that the engine is timed properly and that the spark plug type isn't considered too "hot."
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.
Ford 4.6 Spark Knock Under load Where is the knock sensor located?
it depends on what engine you have but most of them are a 5.4 or 4.6 or 4.2 and those have the knock sensors under the intake manifold on the passenger side.
