If an engine is designed to burn 87 octane fuel and you put in 91 octane, is it going to cause any problems in the long run? Or would 89 octane be fine?
Any info is greatly appreciated!
Enthusiast
If an engine is designed to burn 87 octane fuel and you put in 91 octane, is it going to cause any problems in the long run? Or would 89 octane be fine?
Any info is greatly appreciated!
" I am a nobody, and nobody is perfect; therefore, I am perfect."
My bumper sticker "If you can read this...I can slam on my brakes and sue you"
Rookie
A higher octane rating than necesary won't hurt or help your engine, it'll only cost more. Use the lowest octane rating that your engine runs well with.
"It's the only car I've ever driven that'll spin the wheels at 200 mph."
-Mark Donohue, talking about the Penske 917/30 twin-turbo Porsche Can-Am car.
Member
91-89 is fine.
now if you put 100+ it would drop performance(hp) cause it would take longer to ignite that fuel.
1993 nissan 240sx hatchback(stock) <<drifter, straight liner, road courser
"Horsepower is the force that determines how fast you hit the wall. Torque is the force that determines how far you take the wall with you after you hit it."
"Horsepower sells cars, torque wins races" - Carroll Shelby
"Real cars don't make power at the front wheels....they lift them."
Enthusiast
http://www.leeric.lsu.edu/bgbb/7/ecep/trans/b/b.htm
What Sutton said. Get the lowest octane your car is rated for.
Enthusiast
Thanks guys for your quick replies!!
" I am a nobody, and nobody is perfect; therefore, I am perfect."
My bumper sticker "If you can read this...I can slam on my brakes and sue you"
Enthusiast
I could go into more engine theory than youd probably be able to handle, but like the other guys said, yes, 91 octane won't hurt the engine - just your pocketbook. You won't get any boost from a car designed to run 87 if you run 89 or 91 - so just dump in the 87 and happy motoring!
An it harm none, do as ye will
Approximately 79% of statistics are made up.
Enthusiast
if you have standard compression ratios, tou should the standard fuel, only go with a higher octane if you have upped your compression.
Fanatic
If you advance your timing, you will gain the benefits of the higher octance, it gives it a longer time to burn.
"We went to Wnedy's. I had chicken nuggest." ~ Quiggs
Rookie
lol, my engine(toyota 4k) is design to run under octane 89, and the lowest octane i can get here is 93 at Shell station, and i'm using Petronas, who only provides 97 octane fuel... oh well.. so much of getting the lowest octane fuel design for the car...
anybody know how much compresion ratio can octane 97 fuel handles?
i'm just planing to swap a 4ag and i'm wondering with 97 octane fuel what compresion ratio can i reach... is 11.8:11 okay?
Last edited by SilverArrowZ; 09-30-2004 at 10:43 PM.
-UCP's Hardcore 4AG enthusiast
-Undergraduate student, saved half of the money to buy an AE111 Trueno half cut
Enthusiast
not completely sure, but it should be, you can play with the timing too just in case.
i hear they sell that 97 octane for 25 cents a gallon in Qatar. Man i need someone to sent me a barrel now and then.
An it harm none, do as ye will
Approximately 79% of statistics are made up.
Rookie
97 octane fuel is "standard issue" here lolz. Its premium fuel that is available at any station in malaysia. The 93 octane regular fuel is about to be obsoletted because its kinda leaded or something.
its 1.36 ringgit per litter here, but i heard the price had raised 5 cent per liter, so it would be 1.41 ringgit.
so, if counted in us$ and us gallon, it would be US dollar 1.41 per gallon.. i hope my calculation is correct
-UCP's Hardcore 4AG enthusiast
-Undergraduate student, saved half of the money to buy an AE111 Trueno half cut
Enthusiast
i live in the wrong country...
An it harm none, do as ye will
Approximately 79% of statistics are made up.
Rookie
what do you mean live in the wrong country?
-UCP's Hardcore 4AG enthusiast
-Undergraduate student, saved half of the money to buy an AE111 Trueno half cut
Enthusiast
It's because it's twice as much here in the U.S. for a gal. of gas and we don't get 97 octanes
" I am a nobody, and nobody is perfect; therefore, I am perfect."
My bumper sticker "If you can read this...I can slam on my brakes and sue you"
Member
yeh, we gotta run to the nearest racetrack that carries 95+
my guess is that you can run 97 octane on 11:8 compression, but put 100 if ya can just to be safe.
1993 nissan 240sx hatchback(stock) <<drifter, straight liner, road courser
"Horsepower is the force that determines how fast you hit the wall. Torque is the force that determines how far you take the wall with you after you hit it."
"Horsepower sells cars, torque wins races" - Carroll Shelby
"Real cars don't make power at the front wheels....they lift them."
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