Quote Originally Posted by ghosthunter View Post
regarding ignition timing difference between gasoline & LPG:

taken from:
http://ask.metafilter.com/mefi/23863

LPG has a higher octane number than petrol. As the engine's ignition timing curve is mapped for petrol the LPG will not burn as efficiently. I've carried out a programmable, dual map, ECU installation and dyno tune on a dual fuel Australian delivered Ford F350 (factory EFI). The total timing difference between standard unleaded and LPG was 12.5 degrees, additionally, the LPG produced 15 horsepower more (at the wheels) compared to petrol.


BTW, I am not saying you should adjust your timing 12.5 degrees... you might just get better power & economy with it.
good morning ghosthunter, nakapunta ka na kay auto-xer?