A cutaway drawing shows you where the parts are. It cannot show you why a two-valve pushrod V8 makes its torque low down, or what happens when the fuel is too low-octane for the compression ratio. You cannot draw a behaviour; you have to run it. So drag the compression slider here and the torque curve, the exhaust note and the detonation all move at once, because there is nothing underneath them but the model.
The writeups go through the model piece by piece, and the changelog records every physics change as it ships.
Some are built to a named real engine’s published bore, stroke and compression ratio, and the roster says which figures agree; the rest are honest builds of a layout and claim nothing more. You can also design one from scratch.
February Solutions, MB, registered in Lithuania (company code 308104153). The roster is forty-six real engines we modelled and checked against published figures, and it stays that size: we no longer add engines on request. The one you want and cannot find is yours to build in the builder, any layout, any size, any induction. A real engine name says which engine we modelled; no manufacturer is involved, and we use no logos or trade dress.
The Pro plan pays for the site — there are no adverts on it. Every real engine stays free, only building your own is paid, and we sell no personal data. The privacy policy sets out what we collect and how to switch the optional parts off. Found something wrong with the physics? That is the most welcome email we get, so get in touch.