The Uncommon Lauson Engines

Looking Beyond Frost Kings at Unusual Lauson Engines

| September/October 2002

Most engine collectors are familiar with the more well-known models of Lauson engines such as the spoke flywheel Frost King series, the disc-flywheel W Series and the various small air-cooled models built during the 1930s, 1940s and early 1950s. Our purpose here, however, is to take a look at the now-uncommon Lauson engine models that were produced between the early 1900s and 1956.

Readers seeking a comprehensive account covering the history and development of Lauson engines and tractors built prior to 1956 should refer to the November and December 1996 issues of Gas Engine Magazine. In general, nearly all models of the Lauson horizontal engines and many of the later 'high speed' engines could be equipped with a gas mixer for running on natural or manufactured gas instead of gasoline. Engines factory-equipped with gas mixers are much less common than those equipped with gasoline mixers. Throttle-governed variations of both the spoke flywheel and W Series engines seem less common than those equipped as hit-and-miss.

The Engines

Around 1910, the John Lauson Manufacturing Company introduced a small horizontal hopper-cooled engine rated at 1 HP at 500-550 rpm. This engine (Figure 1) was designated the Model Z, and it appears in Catalog 14 of circa 1910-1911. In magazine ads, the engine was called 'The Baby Frost King'.1 Except for the ignition system, the basic design of this engine was similar to that of the 2-1/2 HP to 5 HP models also shown in Catalog 14. The Baby Frost King was built with a high-tension, spark plug/buzz coil/battery ignition system, whereas the standard ignition system on all the other Lauson models at that time was a low-tension, igniter/coil/battery system (jump spark ignition was available as an option on all other sizes of Lauson engines). The Baby Frost King was equipped with a water-cooled cylinder head, suction-feed gasoline mixer and hit-and-miss governor. Production of the Baby Frost King probably ceased sometime around 1913.

Also shown in Catalog 14 is a two-cylinder horizontally opposed engine (Figure 2) described as being produced in 'sizes greater than 25 HP.' These engines were built only in a plain-cylinder (not hopper-cooled) design with a flat, double throw crankshaft. Fuel was gas or gasoline. They featured mechanical operation of the intake and exhaust valves, throttle-governing and air-to-head starting. A complete air starting system, including the air compressor, was furnished with the engine. This model does not appear in Catalog 18, which is dated 1916.

Sometime around 1913, Lauson introduced two- and four-cylinder vertical engines with ratings of 18, 25, 36, 50, 80 and 100 HP. By this time, Lauson was building engines for the DeLaval Dairy Supply Company, which were sold under the Alpha name. Two- and four-cylinder versions of these engines are referenced in the DeLaval-Alpha engines Catalog C 8-13, which is dated 1913.

Four-cylinder versions with ratings of 35, 50 and 60 HP at 450 rpm and 80 and 100 HP at 300 rpm are described in Lauson Catalog 18 of 1916 (Figures 3 and 4). These engines were designed to operate primarily on kerosene (with gasoline starting), although the description also references 'power distillate,' gas, gasoline, 'motor spirits' and alcohol fuels. The general construction of these engines featured individual cylinders and cylinder heads, an enclosed crankcase with five main bearings and one outboard bearing. Both valves were mechanically operated. The main bearing and cylinder lubrication was by force feed, with splash oiling used for the crankpins. A throttling-governor was used, with a separate carburetor for each cylinder. The ignition system consisted of a single, low-tension Sumpter magneto and an igniter at each cylinder. A brass bus bar was used to take voltage from the magneto to the igniters. Air starting was standard equipment on the 80 HP and 100 HP versions and included a 1-1/2 HP engine, air compressor and air tank. The smaller versions used a 'hand starter,' but air starting was an option. Production of these engines probably ceased sometime around 1918.


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