I wanna hear the techno babble about propane and octane ratings. I am hearing that for some reason propane has almost as much separation in rating as regular to super unleaded. I sure as anything wouldn't pull up to Joe's gas and just pump whatever came out of the nozzle!:eek:! What would cause such as vast difference? Is it the particular manufacturer? U.S. or foreign LPG? Time of year? Individual distibutor or retailer?

Let the science convention begin! :D

No fawkin rocket scientists here? :flipoff2:

Guess not! Thanks for the :barf: newbie ... :flipoff2:

....told me it runs in the 100-107 range. So even if there is a variation in the rating you will still be in the 95+ range. Still better then pump gas.

I also understand that part of propanes differences come in the fact that it burns slower then gas. This, morso then the octane, is why it requires so much advance and a faster advance curve.

I would think that as long as you are conservative in the inital timeing, and advance curve you should never have a serious spark knock problem unless you are running very high compression or cylinder pressure that is abnormaly hiogh for your given compresion ratio.

In my 10:1 SBC I run about 22 degrees initial timing and almost 40 degres all in by 2000 RPM and I have had no detonation or pre ignition problems yet although so far I have only driven on the street and not gotten on it for a long pull under load due to lack of brakes.

HTH

Thanks! :beer: Just taking it to the top for ya'.