The last gas question

[Tamago]

Originally Posted by jambo101

Thats backwards ,,the higher octane burns cooler than lower octane thus the carbon builds up ultimately choking your engine and oil with carbon and sludge build up.You might want to check your timing for that rattling you are hearing as the car should run smooth and quiet on regular octane gas.

actually no.

higher octane fuel is less likely to detonate prematurely. this means it doesn't burn when it should without a timing/spark advance.

without a way to advance timing, higher octane fuel will cause your engine to run a little hotter (ever run a briggs and stratton on 93 octane? after awhile you'll notice the header will be glowing red hot)

[Tonavi]

Originally Posted by Tamago

without a way to advance timing, higher octane fuel will cause your engine to run a little hotter (ever run a briggs and stratton on 93 octane? after awhile you'll notice the header will be glowing red hot)

I can believe this, but going form 87 to 89 would wreck a motor? Using race gas, yes, using +2, though?