Internal Combustion Engine (2021)

You meant - awful knocking combustion in the first, main animation? I never catches any real bug is those great posts, but this one, especially as first animation on the page - weird.

Re: Internal Combustion Engine (2021)

#6

Post by zuzululu » Wed, Jul 01, 2026, 4:53 PM UTC

[flagged]

Re: Internal Combustion Engine (2021)

#7

Post by bob1029 » Wed, Jul 01, 2026, 4:54 PM UTC

> Presence of oil is critical here as it creates conditions for hydrodynamic lubrication.

You can hear this effect in some vehicles at initial startup time for a few seconds. I know of certain Ford engines where it actually causes issues over time. The model years with auto start/stop have the worst of the cam rattle disease.

Re: Internal Combustion Engine (2021)

#8

Post by fauria » Wed, Jul 01, 2026, 5:03 PM UTC

"in real running engines the rotating crankshaft should float completely on a very thin surface of oil" - I found this to be a great insight.

Re: Internal Combustion Engine (2021)

#9

Post by CraigJPerry » Wed, Jul 01, 2026, 5:04 PM UTC

The thing that's missing here that really drastically changes the story is all the emissions control hardware that would exist on such an engine.

This is a circa 1990s engine in the US market i think? Dual Overhead Cam didn't really become popular in the US market until then i think. 70s-80s for single overhead cam to become established.

The diagrams are beautiful and informative as always from this author.

Re: Internal Combustion Engine (2021)

#10

Post by throw567643u8 » Wed, Jul 01, 2026, 5:07 PM UTC

zuzululu wrote: post #6

[flagged]

Probably better for the environment too.