Engine Design

Formula, calculations, good practice and general know-how. Information and pages will get gradually added, but if there is something you would like to know or contribute please do drop us a line.

Machining a Crankshaft is a daunting task and so I decided to describe my approach in a step-by-step manner. This is quite a large crankshaft for an open crank engine with a 40mm stroke. The crankshaft started life as a piece of flat 12.7mm thick flat mild steel.


Exhaust Silencer – the expansion chamber of the exhaust silencer gives a broadband attenuation, with null points related to the overall length of the chamber itself. The maximum attenuation is governed by the ratio of the cross-sectional areas of the connecting pipes to that of the expansion chamber.