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Originally Posted by JackG
While I agree that the term "premium" is slightly misleading to the uninformed, it is also appropriate. The numeric system confuses you, so it's not perfect either.
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i'm not confused; numerals refer only to the volatility of the fuel.
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Originally Posted by JackG
Higher octane fuel is better behaved. It doesn't detonate in high compression or turbo/supercharged engines as easily. It's necessary in many high performance engines that would simply self-destruct running "regular". It has highly desirable burn characteristics compared to "regular". It is indeed "premium" fuel. It is indicated as such by the higher octane number.
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how is it better behaved? does it ask permission before pre-detonating? it doesn't detonate as easily, that's it. look into your own advice as to what the numeric system means. it has nothing to do with the quality of the fuel. how about diesel engines? the "premium" tendency to not detonate would be opposite what you'd want in that case. in fact, once detonated, the flame front is governed by the combustion chamber, not the octane of the fuel. the only undesirable burn is pre-detonation, which is an unorganized explosion--hence the engine knock. what are these "highly desirable burn characteristics" you're talking about?
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Originally Posted by JackG
The lie you continue to propagate is "87 octane has more potential horsepower than 93 (or higher) octane". That is simply untrue. Both regular and premium have the same energy content, and therfore the same capability to produce power. They do have different burn characteristics, making the premium fuel necessary in some engines that require it.
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agreed, except for the "necessary" part.
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Originally Posted by JackG
Many modern engines that require premium will not ping when fed regular. The engine computer adjusts to compensate for the less than ideal fuel.
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that's the point of the thread.
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Originally Posted by JackG
You may not see it until the boost gauge gives you an indication (which is likely a last-ditch effort to save the engine, not the first), or you may not notice it at all. The engine management computer is doing its job.
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what would be the "first" ditch effort to save the engine? no, this is the first and only adjustment made in response to pre-detonation. if i (and the knock sensor) don't notice pinging, then it ain't happening. and agreed, that's the engine management system doing its job--preventing potential engine damage.
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Originally Posted by JackG
The manufacturer has nothing to gain in requiring premium fuel if it wasn't needed. They do it for a reason, and it's not to give a liberal arts poetry writer something to argue about, on a subject matter in which he seemingly doesn't have a clue. It's because the engine was designed to take advantage of premium fuel, thereby producing more power, and it requires it.
Take a freakin' engineering class...  |
the manufacturer specifies it because under some circumstances, you won't get as good performance, and possibly fuel economy, on lower grade fuel. not always, not even usually. they specify it because it gives an extra margin of safety which may or may not be needed. it's quite possible that the engine detunes under some circumstances when using lower grade fuel. is that dangerous to the engine? no. does it degrade performance under these circumstances? yes. which engineering class explained to you the differences between premium and unleaded fuel and their effects on sports car performance? right, that's what i thought. if yer gonna flame, maybe you should have some facts or references to back up your bs?