Nemett looks at another of the Model Engineer Exhibition I/C engine collections, comments on coils, 3D CAD, and introduces a new twin-cylinder engine design

摘要

I will start this time by looking at another of the I/C engine collections from the exhibition, this time the fabulous motorcycle engines by Bill Connor. Bill's engines have featured regularly in this column and he had brought the motor cycle engines from his collection for visitors to admire. The first engine is the 1:2 scale single-cylinder Matchless G50 racing engine (photos 1 and 2). The scale chosen by Bill gives a capacity of 50cc. The engine has a compression ratio of approximately 10:1 and features roller main and big end bearings. A speed of 10,300rpm has been achieved on four-star petrol and Castrol R oil.