Contact

Corrections and better data sources are genuinely welcome — this is a reference site, and accuracy matters more than being right the first time.

Get in touch

Use the address below for corrections, data-source suggestions, or feedback on any calculator. If you are reporting a wrong figure, please include the engine, the bore, stroke and cylinder count you entered, and the result you expected, so it can be reproduced quickly.

Email: add your address before launch

We read every message but cannot offer individual engine-building or tuning advice; the calculators and guides are the support we can provide at scale.