"J.H. Roulleaux" wrote:
> 2. the extremely small tolerances of the rotor assembly requires a
> certain degree of lubrication, this is provided by leaded petrol, but
> the different chemicals in unleaded do not guarantee a proper
> lubrication.
As others have suggested, not exactly true. Yes, the rotor requires some
lubrication, but that is accomplished by the fuel itself in concert with
another element, sulfur.
Note that mechanical (as opposed to electronic) diesel engines have for
years used shuttle-operated metering units very much like that used in
the Lucas PI system, at far higher operating pressures, without benefit
of lead additives. Sulfur represents about 1/4 to 1 percent of the total
by weight in most petroleum fuels, depending upon source, and that
amount of sulfur serves quite adequately as a lubricant for metering
unit parts. Sulfur is almost always present in refined fuels to some
degree, so it's not as if one must add it.
Cheers.
|