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With a higher octane fuel you can do a few things to boost power that a lower octane fuel will not support without detonation. But changing the fuel alone will not make a difference if the engine is tuned for the lower octane fuel. It is all about inter cylinger pressure. Supercharging, higher compression ratio, advancing timing, intake runner tuning, exhaust tuning------all can lead to higher ICP, and that is what will give more oomph------and will likely require higher octane to keep the engine from self disassemble. But the octane is not the cause of the power increase in any significant percentage. Read what the quote from the link says, not what you extrapolate from the statement. Quote:
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This exercise is more a PR stunt than a realistic alternative to avgas. I can see limited applications, but the availability/infrastructure problem will make it impractical for a long time. All of the buses and trash trucks in my town are CNG powered, but that is easy, they all return to the same spot every evening. Because of that, they do not require dual-fuel ability and can be built to get the maximum performance on CNG by running very high compression, they are converted diesels, to take advantage of the octane available.
John Clark ATP, CFI FAAST Team Representative EAA Flight Advisor RV8 N18U "Sunshine" KSBA |
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Now, when they fly a Husky on used fryer oil from Maccas.... |
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