Now addicted to premium GAS!!!
07-12-2005 | 03:16 AM
#81
Senior Member
SL Member
Joined: Jul 2004
Posts: 13,961
Originally Posted by Rion
Your car should NEVER knock. Something is wrong with the gasoline or your car.
Octane number is a measurement of how much the fuel will resist pre-detonation. Plain and simple.
If you car is designed for 87, then 89 or 92 or 105 octane will not give you even ONE more horsepower. Anyone who tells you different is ignorant of the facts. It's not "better" for your car, 87 octane has the same detergents in it as the premium stuff these days.
Don't kid yourself. Premium fuel is for cars that require it because they have high compression or a turbo-- period.
I laugh at people who put 92 in their Civic thinking it will give them 10 more hp. Premium gas will give you as much extra power as stickers do.
It is definitely in your head. Guaranteed.
You should go to your dealer if the car is knocking AT ALL.
Octane number is a measurement of how much the fuel will resist pre-detonation. Plain and simple.
If you car is designed for 87, then 89 or 92 or 105 octane will not give you even ONE more horsepower. Anyone who tells you different is ignorant of the facts. It's not "better" for your car, 87 octane has the same detergents in it as the premium stuff these days.
Don't kid yourself. Premium fuel is for cars that require it because they have high compression or a turbo-- period.
I laugh at people who put 92 in their Civic thinking it will give them 10 more hp. Premium gas will give you as much extra power as stickers do.
It is definitely in your head. Guaranteed.
You should go to your dealer if the car is knocking AT ALL.
her 93 octane and she was fine with that and no more pinging no matter how well i tuned it she still pinged on 87 octane the owners manual recomended to use 91 low lead octane and yes when i had the heads off i had 'em install hardened exhust valve seats and i used the lead additive octane boost (all in one 
)
07-12-2005 | 04:07 AM
#82
Senior Member
SL Member
Joined: Apr 2005
Posts: 1,834
From: Miami, FL
Something is wrong with his spark timing setting (it's a computer, thing, right? Perhaps the -knock sensor is disconnected-???
Dunno! BUT the opening post in this thread makes perfect sense. Let's define knock, taking the data directly from Sir Harry Ricardo's famous book, "The High Speed Internal Combustion Engine"
I can hardly overstate how basic and seminal his research was. He identified the cause of spark knock and created the modern combustion chamber design. His work was incorporated into practice just in time. Due to the increased efficiency of Ricardo head design the famed Liberty engine helped us win the first world war.
I'll see if I can find Mr. Ricardos' book and quote his definition of knock. What is detonation? It's something very well understood now for more than ninety years. He was the master on this subject.
--more later--
Dunno! BUT the opening post in this thread makes perfect sense. Let's define knock, taking the data directly from Sir Harry Ricardo's famous book, "The High Speed Internal Combustion Engine"
I can hardly overstate how basic and seminal his research was. He identified the cause of spark knock and created the modern combustion chamber design. His work was incorporated into practice just in time. Due to the increased efficiency of Ricardo head design the famed Liberty engine helped us win the first world war.
I'll see if I can find Mr. Ricardos' book and quote his definition of knock. What is detonation? It's something very well understood now for more than ninety years. He was the master on this subject.
--more later--
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