News for hackers. Stuff that matters.

A comment on Simulating an Entire Car Engine (yes, it makes noise) [video]. Parent comment

Re:Simulating an Entire Car Engine (yes, it makes noise) [vi... by Too on Monday August 08, 2022 @04:10AM (#32383353)
Due to inertia of the piston and minor velocity difference of moving up vs down in a cranking geometry, an ICE will be unbalanced and generate vibrations. Called primary and secondary balance.

This has nothing to do with tolerance, but yeah I’m not talking about rattling either, just vibrations.

Unless you have a V8, where all this unbalance is cancelled out by opposing movement on the other side of the engine.

[ Parent | on HN ]
Re:Simulating an Entire Car Engine (yes, it makes noise) [vi... by tekknik on Monday August 08, 2022 @09:02AM (#32384901)
It’s more to do with crankshaft design than piston count. Either way, engines have had dampeners / balancers on them since before either of us were born. So again, the sound is coming from the explosions, not the vibrations.
[ Parent | on HN ]