Originally Posted by
Papa Tiger
My experience with CNG powered gas engines is it doesn't exactly burn clean in the motor. It isn't like the clean burn of a stove. There is a very nasty residue from it coating everything in the fuel delivery/top end of the motor. There is a lubricant in the CNG that is very nasty.
I'm guessing that's the ethyl mercaptan that is added to make it smell like rotten eggs ... or something else. CNG is actually a mix of various-length hydrocarbons, though not as many as is gasoline or diesel.
Do you know, does LP have the same issues with not burning clean? I've always heard people claim that natural gas-powered engines last a lot longer because supposedly it burns cleaner than diesel or gas. Not so?