prelude2.2 wrote:
I do have a small airfield near me. Id imagine id have to change the jets etc if im running avgas?

To be pedantic, if jetted optimally, you'd need to rejet if it was cold and damp yesterday, and warm and sunny today!

Absolutely, you will need to rejet for a different class of fuel. I've jetted close enough to worry about using 95 instead of 97/98 before!

Basically, you want to jet for the lowest grade of fuel you're likely to use, never the highest. Using a higher grade of fuel, at worst, gives an element of safety. The difference between AVGAS and U/L however, is extremely significant. It'll still run, but it will be crap. You need to optimise for leaded fuel, and that includes ignition and compression. It's not just about jetting, and you certainly wouldn't want to optimise for AVGAS then find you only have access to unleaded, because that will almost certainly end in catastrophic engine failure.
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Andy.
NSR-WORLD.COM

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