MY ‘LOYAL’ ENGINE

By Staff
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'Loyal'--second design. Courtesy of Arthur P. Stone, Highland Drive, Box 246, Elfers, Florida 33531.
'Loyal'--second design. Courtesy of Arthur P. Stone, Highland Drive, Box 246, Elfers, Florida 33531.
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I have many books on two-cycle engines, old and new, but never came across any reference to this engine. The enclosed diagram will explain its operation. The engine shown in the photo is 1' x 4', which is the one I use to drive my lathe.
I have many books on two-cycle engines, old and new, but never came across any reference to this engine. The enclosed diagram will explain its operation. The engine shown in the photo is 1' x 4', which is the one I use to drive my lathe.

Box 246, Elfers, Florida 33531.

I have always been interested in unusual types of engines and
when a boy in Brighton, England 68 years ago, I saw a very brief
description of an engine made in France called the ‘Loyal’.
No details were given other than a diagram of the cylinder showing
the valves and hot tube ignition and the statement that it
illustrated the theory of stratification of the gases.–(This will
be understood from the ‘sequence of operations’).

Very few of these engines must have been built because I have
never seen any reference to them in any book devoted to the subject
of 2 cycle engines since.

To anyone familiar with 2 cycle engines, it would seem dubious
whether this engine would actually work, however I designed one as
simply as possible and it works perfectly, has good power, idles
nicely, and of course needs no gas/oil mixture. My friend, Mr.
Crafts of Akron, Ohio has built two different size engines from my
drawings and has demonstrated them at various shows.

I hope that you will find the following description of my engine
of interest. This little engine is a two cycle, but unlike all
other types, employs no preliminary compression of the charge, all
operations being performed within the cylinder–consequently no
crankcase is necessary. Intake and exhaust valves are fitted, both
automatic (spring controlled), no cams or gears. No mixing of oil
and gas.

This is a slow speed engine, 500-1200 rpm. but on account of the
long stroke gives very good power, (a 1?’ bore engine drives my
9′ lathe). The principle upon which my engine is based, I
believe, originated in France about 1900 or perhaps a little
earlier, and was never widely known.

I have many books on two-cycle engines, old and new, but never
came across any reference to this engine. The enclosed diagram will
explain its operation. The engine shown in the photo is 1?’ x
4′, which is the one I use to drive my lathe.

  • Published on Nov 1, 1972
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