Fuel requirements
Joined: Dec 2003
Posts: 3,766
From: Georgia, USA
RE: Fuel requirements
Do you hear an echo in here?
Good info. about octane numbers. I know Flyingphil is from down under. That's why I made the comment about aliens' comments. He never explained all this RON-MON stuff, nor did he even bother to divide what he said by 2.
Good info. about octane numbers. I know Flyingphil is from down under. That's why I made the comment about aliens' comments. He never explained all this RON-MON stuff, nor did he even bother to divide what he said by 2.
Joined: Mar 2004
Posts: 49
From: Australia
RE: Fuel requirements
Not exactly sure how octane is Measured in Australia. But here (by government legislation), unleaded has a minimum rating of 91 octance, lead replacement 96 and premium unleaded 95. Shell and Bp offer special premium unleaded which has 98 octane which I find makes my car take longer to start.
Joined: Dec 2003
Posts: 3,766
From: Georgia, USA
RE: Fuel requirements
Here's some gasoline trivia that may win you a drink during your favorite saloon's happy hour.
Question: Which grade of gasoline is more volatile, regular or premium?
Answer: Regular.
In order to help prevent engine pre-detonation (or pinging or pre-ignition) premium gasoline is used because a higher temperature is required to ignite it versus regular gasoline. Regular gasoline can cause pre-detonation because it ignites at lower temperatures than premium gasoline. Pre-detonation occurs when the gas/air mixture in a combustion chamber ignites before the spark plug in that particular cylinder glows. Most commonly, the pre-ignition is caused by glowing carbon buildup in the combustion chamber or by hotter running high performance engines.
The higher the gasoiline's octane rating, the higher the ignition temperature must be to ignite it. That's why racing gasoline has such a high octane rating. Racing engines run very hot. But they also have extremely high-voltage ignition systems to ignite the high-octane gasoline. That's why you don't want to waste your money on premium gasoline if your engine doesn't need it.
Question: Which grade of gasoline is more volatile, regular or premium?
Answer: Regular.
In order to help prevent engine pre-detonation (or pinging or pre-ignition) premium gasoline is used because a higher temperature is required to ignite it versus regular gasoline. Regular gasoline can cause pre-detonation because it ignites at lower temperatures than premium gasoline. Pre-detonation occurs when the gas/air mixture in a combustion chamber ignites before the spark plug in that particular cylinder glows. Most commonly, the pre-ignition is caused by glowing carbon buildup in the combustion chamber or by hotter running high performance engines.
The higher the gasoiline's octane rating, the higher the ignition temperature must be to ignite it. That's why racing gasoline has such a high octane rating. Racing engines run very hot. But they also have extremely high-voltage ignition systems to ignite the high-octane gasoline. That's why you don't want to waste your money on premium gasoline if your engine doesn't need it.
Joined: May 2004
Posts: 3
RE: Fuel requirements
ORIGINAL: Lugnut
Here's some gasoline trivia that may win you a drink during your favorite saloon's happy hour.
Question: Which grade of gasoline is more volatile, regular or premium?
Answer: Regular.
In order to help prevent engine pre-detonation (or pinging or pre-ignition) premium gasoline is used because a higher temperature is required to ignite it versus regular gasoline. Regular gasoline can cause pre-detonation because it ignites at lower temperatures than premium gasoline. Pre-detonation occurs when the gas/air mixture in a combustion chamber ignites before the spark plug in that particular cylinder glows. Most commonly, the pre-ignition is caused by glowing carbon buildup in the combustion chamber or by hotter running high performance engines.
The higher the gasoiline's octane rating, the higher the ignition temperature must be to ignite it. That's why racing gasoline has such a high octane rating. Racing engines run very hot. But they also have extremely high-voltage ignition systems to ignite the high-octane gasoline. That's why you don't want to waste your money on premium gasoline if your engine doesn't need it.
Here's some gasoline trivia that may win you a drink during your favorite saloon's happy hour.
Question: Which grade of gasoline is more volatile, regular or premium?
Answer: Regular.
In order to help prevent engine pre-detonation (or pinging or pre-ignition) premium gasoline is used because a higher temperature is required to ignite it versus regular gasoline. Regular gasoline can cause pre-detonation because it ignites at lower temperatures than premium gasoline. Pre-detonation occurs when the gas/air mixture in a combustion chamber ignites before the spark plug in that particular cylinder glows. Most commonly, the pre-ignition is caused by glowing carbon buildup in the combustion chamber or by hotter running high performance engines.
The higher the gasoiline's octane rating, the higher the ignition temperature must be to ignite it. That's why racing gasoline has such a high octane rating. Racing engines run very hot. But they also have extremely high-voltage ignition systems to ignite the high-octane gasoline. That's why you don't want to waste your money on premium gasoline if your engine doesn't need it.
Art
Joined: Dec 2003
Posts: 3,766
From: Georgia, USA
RE: Fuel requirements
Huh? I think your calculator needs fresh batteries. The difference is $4.50 per tank in your example. Do the math. That's if I understand what you're saying, which I don't think I do. I think you maybe misunderstood something I said?
Also, this phrase makes almost no sense to me because of the alien-like grammar:
Anyways, what factory car(s) in America is designed to run only on 93 octane gas, or even 92 octane? Arrrrrgh! Wrong! You can't get 93 or 92 octane gas everywhere in America (lower 48). Are MB cars sold in America geo-centric? Nope.
Also, this phrase makes almost no sense to me because of the alien-like grammar:
For a 15 gallon tank of 87 at 1.90 that's 28.50 for a tank for the gas the computer and engine calls for is 2.10 per gallon ...
Joined: Dec 2003
Posts: 134
From: Malaysia
RE: Fuel requirements
Very informative and enlightening discussion we have had here.
But let us stick to the premium grade for our dear MBs.
I use premium for my 1979 MB200 and my PONTON MB180.
They give me good performance.
But let us stick to the premium grade for our dear MBs.
I use premium for my 1979 MB200 and my PONTON MB180.
They give me good performance.
Joined: Dec 2003
Posts: 3,766
From: Georgia, USA
RE: Fuel requirements
If every MB owner used premium-grade gas, then many MB owners would always be wasting their gas money. Premium gas doesn't "give" performance at all. It prevents a loss of performance by preventing pre-detonation. That's because high-grade gas is less volatile than low-grade gas. Hello?
I can understand why your higher compression '67 might need premium (actually leaded) gas, but something is wrong with the '79 if it needs it. Either that or you have a foreign-spec MB that doesn't mirror US smog requirements so maybe it does need premium.
I can understand why your higher compression '67 might need premium (actually leaded) gas, but something is wrong with the '79 if it needs it. Either that or you have a foreign-spec MB that doesn't mirror US smog requirements so maybe it does need premium.
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