Question:
2007 altima 2.5S able to use 91 octane gas or only use 87 octane gas ?? if try use 91# gas will broken engin ??
Answers:
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Octane is a fuel molecule with an 8 carbon atoms. Heptane is the same except it has only 7 carbon atoms. The heptane is considered to be the fuse for the octane.
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In other words, it takes more energy (positive change in atmospheric pressure) to ignite the octane.so the heptane content is used to help light the octane during the powerstroke on lower compression engines.
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This is why higher compression engines require fuels with higher Octane contents.because they experience HIGHER combustion chamber pressures.they pack enough energy to ignite that fuel. This is why turbo charged engines require the good stuff, they compress the air more than a normally aspirated engine.
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91 octane roughly has 91 percent octane...and the corresponding heptane remainder.but it doesn't always mean this.it solely means that it has the same physical resistance to "auto-ignition" as that previously described mixture does.
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If you used the cheap stuff on the high compression engines, the heptane in the fuel would "auto-ignite" before the piston even reached top dead center.(its highest point in the power stroke cycle) This will sound like a bunch of marbles smacking around in your engine.it is actually smaller explosions creating downward force on the upward bound piston before it reaches its peak height and thus rattling the piston in its bore. (not good)
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To answer your question, yes, you can run premium fuel, but your 2.5 was designed to run on medium grade, it can also detect the lower grade via knock sensors, it will retard your ignition timing automatically and you won't notice much difference except a bit less pep off the line. To get the best pep out of your 2.5 engine, use mid grade.
Your engine does not run high enough compression to see any benefit from premium fuel so don't waste your money!
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The 3.5 is another story.
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Yes - all new cars can still use the good stuff even if there made for the ****.. bottom line is your engine will have more power and burn hotter so dont overheat it. octane rating is amont of patrollem dissalites (rocket fuel) added to the gas to keep your engine clean and fun. older poor running engines can use this once a month- as for new engines it doenst matter.. your BUCK$$$How good are the 2005 wrxs and wrx sti?
There should be a sticker in the engine compartment or the under side of the hood. it is the engine specifications and will contain the ideal octane level. If it's not under the hood check the insides of the doors or even the glove department door. If you cannot find a sticker that says it then check the owners manual. Last attempt you can even call a nissan dealership and see if they will tell you.Yes, but it's a waste of money
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Yes every modern car will take 91. Dont really need it for the 4banger though. You nissan manual will tell you to use no less than 91 but that is B.S.How can i swap 2 valve heads for a 4 valve in a 4.6 mustang modular?
yes it can run on 91 octane. some say that it is pointless, but then i personally think that it is better for your car and it gives it just a little bit of more horsepower. yes it is more expencive but for me it is worth it.More Questions & Answers ...
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