Engine Calculations
Tools and guides for calculating engine parameters such as cylinder displacement and compression ratio when rebuilding or modifying classic motorcycle engines.
Engine displacement can be calculated from the bore and stroke. Once you have the displacement you are one measurement away from calculating compression ratio. This page shows you how to do all of this.
Trigonometry can be used to convert crank rotation to piston drop. If you have the former, and would like the latter for setting up your engine, this article will show you how to do the conversion and even allow you to download a handy spreadsheet to do it for you.
Trigonometry can be used to convert piston drop to crank rotation. If you have the former, and would like the latter for setting up your engine, this article will show you how to do the conversion and even allow you to download a handy spreadsheet to do it for you.
Some relatively simple calculations can be used to convert road speed to engine speed or vice versa. This can come in handy when selecting gearing so we'll show you how to do it on this page.