Quote:
Originally Posted by TomcatViP
If you change the fuel, the minimum you wld need is to modify the compression volume and material of the pistons/cylinders that you have an equivalent heat flux.
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No. You are wrong.
If your engine was designed to run on a particular octane, at a particular compression ratio, and you put fuel in that has a HIGHER octane than before, the minimum that you need to do is
nothing. The octane number is just a measurement of it's anti-knock performance. Octane number does not mean the fuel burns hotter, or has more energy in it, or has a "greater heat flux".
You don't need to modify the engine if you want to put higher octane fuel in it.
On the other hand, if you want to run at a higher compression ratio,
then you are required to increase the octane rating of your fuel.