"LCT Paintball" wrote in message
news:17RUd.77210$tl3.9758@attbi_s02...
They usually are kinda expenssive in the short run, but will pay
off after a quanity of cheaper fuel has run through it. The fuel must
have
no alcohol, though.
--

What is kinda expensive?

STC's could be a hundred, to several hundred, or thousands if new pistons
and stuff for an engine are required. Top of head info only; I've never got
an auto fuel STC.

Why no alcohol?

Most airplane fuel systems and engines contain parts that do not react well
to alcohol. Some hoses and gaskets can swell up to more than double their
size.

The other major thing that needs to be looked at, is engine compression
ratios. If it is too high, the engine will detonate, and hammer or melt
holes in the pistons, and other important parts. Also, some fuel systems are
prone to vapor lock.
--
Jim in NC