Modela
Gudday M80
Google tells me
From 1920s onwards Petters made two-stroke and four-stroke engines.
Such models as the M-type and the A-type were highly successful and
were competitors for Lister's D-Type.
The last two-stroke design was the "SS", introduced in 1938. It was
available in two-cylinder to six-cylinder versions and delivered from
125 to 375 horsepower. The "SS" was described as a "superscavenge"
engine and used the Kadenacy principle to charge the cylinders.
In this engine, the exhaust gases leave the cylinder at a speed sufficient
to create a partial vacuum, drawing air into the cylinder. This creates a
supercharging effect, cools the valves and improves scavenging
(hence the name). This inertial supercharging was supplemented
by a blower. These engines ran at low temperatures, due to their
patented oil-cooled piston, and spherical smallend bearing.
This engine was used in British Rail 15107 and British Rail Class D3/14 number 15004
cya
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