Challenge and Associated Engines
Enclosed are two pictures of me coupling two gas engines together to seat in the rings on the green engine. The engine is a circa-1917 Challenge 2 hp made in Batavia, Illinois, just outside Chicago. I was never happy with the compression. I re-cut the 1/4-inch piston ring grooves to 5/16-inch. This squared up the piston ring lands, which were well worn. The new rings ...
