Oil Cooled Engines

    1902 was the first year these engines were made in quantity by Fuller & Johnson.  Previously, a small amount were made by Gisholt across the street from Fuller & Johnson under the name Madison Gas Engine.  These engines were designed by Frank D. Winkley, the same man went on to design the successful Farm Pump Engine.  Early oil cooled engines were rated at 1 1/2, 3 and 6 hp.  By the end of 1903 they had been re-rated to 2, 3 1/2 and 6 hp.  Fuller & Johnson stressed the oil cooled engine's advantages in winter.  Indeed they were correct as the water in a water cooled engine would freeze and crack the cylinder while the oil in an oil cooled engine would merely stay thick until the heat from the engine thinned it out.  The oil cooled did not rein for very long, by 1905 a hopper cooled engine was being manufactured.  These became more popular due to a weight decrease and lower price.  By 1908 the oil cooled was built on order only and very few were sold after that year.  

Working mechanism of the oil cooled engine.  Present are both hot tube and ignitor ignition.

Oil cooled engines could be fitted to a pump jack if desired.

The 6 hp engine finished out the series, notice the larger radiator over the smaller engines.

2 and 3 1/2hp Oil Cooled engine.