1932 Ariel 600cc Square Four
The original unique design of Edward Turner's
four cylinder engine was in effect, a pair of
vertical twin engines coupled together and driving
by means of gear teeth cut into the rims of the
centrally positioned flywheels. As intriduced
in 1930, the engine was of 498cc capacity with
a chain drivn overhead camshaft. Whilst reasonably
successful, it was somewhat under-powered and
a bigger version was required for side-car work.
This was easily achieved in 1932 by opening up
the cylinder bores by 5mm to giv a capacity of
601cc and this model was used for the Maudes Trophy
test, being set to cover 700 miles in 700 minutes,
following this by a timed lap of 87.4 mph. This
model was produced until 1936, being replaced
by the very differently designed 995cc model G4.
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