I have operated farm tractors that were factory built to run on LP. They started OK on LP. There is a large regulator which supplies gas to the intake manifold. The motor oil stays clean for over a year because there is little fuel deposit, and the octane rating of the fuel is good. The telephone companies use LP fuel for standby generators at most offices because the generators are not subject to having the carbuerator gum up if is sits unused. The downside is that the LP fuel is more expensive that gasoline in most places.
The problems that you describe in the New Zealand LP conversions were probably caused by using too small a regulator. On the farm tractors with power comparable to a Merc sedan the LP regulator diaphram would be about 8 inches in diameter.
--- In diesel_mercedes@yahoogroups.com, "n61cm" <jim@...> wrote:
>
> There is a diff between LP and CNG, methinks it would be converted for one or the other, prob LP gas in the US since CNG is rare AFAIK. The quickie $1k conversions that I am vaguely familiar with (they used to do this in New Zealand) required starting on gasoline (not familiar with diesel conversions) and then switching a manual fuel selector valve to the compressed gas (LP or CNG) for normal driving. The compressed gas fuel make the engines run hotter and have less power. Expectations were that the engines would wear out quicker using LP or CNG. Long hills, overheating conditions, towing a trailer, etc require liquid fuel. Can be switched on the fly while driving, using the fuel selector valve. In NZ, every gas station sold either LP or CNG for refueling. While I was down there on a trip, a car exploded like a bomb in Wellington, killing the driver. Must have gotten the trunk filled with LP or CNG and then ignited, who knows. I think all these cars were carbureted, but don't really know. Seem to remember a conversion where they took the carb off, put an LP or CNG fuel insert on, and then piggybacked the carb onto that. Don't know what would be used for fuel injected cars.
>
> Jim
>
> --- In diesel_mercedes@yahoogroups.com, "Chip" <czulli@> wrote:
> >
> > Nate,
> >
> > Thanks for this careful walk through of this LP gas conversion system.
> >
>
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