Hercules Engine News

By Staff
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20601 Old State Rd., Haubstadt, Indiana 47639

With the advent of the E model era later in 1914, the Hercules
and Economy lines would gain their own identity. A typical Hercules
engine was normally dark green in color similar to the present
Rustoleum hunter green. A few early ones were black, and during WWI
olive drab color was used on those produced for the military. For
the most part, stripes were red; however, gold and other colors
were used on special order.

Compared to the Economy, the Hercules had more rounded hopper
corners and an oval hopper opening with a flared lip as illustrated
(top photo). The Hercules engines were all equipped with a
crankshaft guard. The very early ones had a sheet metal guard, but
that was soon replaced by the typical cast iron fender type guard.
The only exception to the crank guard was on the engines equipped
with a direct attached gear drive pumpjack.

The Hercules has a round decal on either side of the hopper. It
depicted Hercules, the Greek god of strength, reaching in with his
bare hands to stop the rotating crankshaft. There were two slight
variations of that logo. Across the top of the decal, it read
‘HERCULES GAS ENGINE COMPANY’ and across the bottom
‘Evansville, Indiana.’ The Economy engines had square
hopper corners and a rectangular hopper opening with about a ?’
lip. The color was dark red such as IHC red and the stripes were
black. The decals were of the slanting Economy type. Currently,
only two sizes are being reproduced; however, it appears that more
sizes were actually used. On the 1? HP size two different hopper
striping patterns were used depending on the decal size as

Somewhat unique in the gas engine industry were the Hercules and
Economy hit and miss kerosene engines. They were offered in the
larger sizes in 1914 and 1915. A small cast iron gravity type
gasoline tank was mounted on the off side of the engine for
starting. The fuel mixer was a brass Lunkenheimer with a water and
fuel adjustment valve. A three way cock was used to switch fuels.
Later a three valve mixer was used, eliminating the three way

During the first half of the E model era (1914 to 1917), several
other differences would emerge. Late in 1915 Hercules began
offering a throttling governed kerosene engine. The hit and miss
kerosene engines were discontinued in both brands. No Economy E
model throttling governed engines were offered. Instead, Sears
introduced its own choice of kerosene burner, the model T Thermoil
made by Hercules. Early literature indicates work was being done on
the Hvid (pronounced veed) type engine by Hercules as early as

Economy engines were offered with a special fuel mixer that
allowed them to burn gasoline, natural gas and artificial gas. It
is currently unknown whether this option was offered on Hercules
brand engines or not.

From serial number data collected so far, it would appear that
during the first four years production was about 60% Economy and
40% Hercules engines. During that time a few odd brand engines were
also produced for jobbers and industrial suppliers.

By 1915, the Webster magneto was standard on the larger size
engines. By late 1916, it was standard on all sizes.

All engines except the 1? HP had a heavy side cast into the
flywheel rim for counter balance. By 1917, that was changed to a
hollowed out section instead.

The Thermoils are a story of their own. The model T Thermoils
will be the next story.

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