9000 RPM is faster than your screen refreshes

Danieru

No wonder idle stop is so important. Idling at 900rpm or 15cycles per second is a tremendous waste. Somehow I always assumed it was slower. 0.9k RPM is way too fast to be the low end of a machine.

dpoloncsak

I'm being incredibly pedantic, but 244Hz monitors would refresh faster than the revolutions, right? Or do I misunderstand Hz

AlfredBarnes

i like going to https://makermotor.com/rpm-visualizer/ and bumping up the rate to multiples of my refresh rate and seeing the pattern change.

ssuds

In a past life I worked on a rocket engine turbopump that spun at 160,000 RPM. It’s crazy to visualize how fast that is. The stresses in the metal are so high that we needed speciality alloys made exclusively for us. The parts are literally ripping themselves apart.

Knork-and-Fife

It is awe-inspiring to think about the metal internals of a combustion engine moving so quickly because they're so heavy and complicated. But in some ways it's more impressive to think about a $40 Dremel 4000 that can plug into a 120v electrical socket and spin at 35000 RPM

maerF0x0

Also there's a honda that revs to 20k RPM - https://www.youtube.com/watch?v=2FOGOUkxcTQ

bitwize

I just tried it and it does that thing where because it makes nearly, and then more than, one revolution per frame, the pistons and crankshaft appear to slow down and stop, then go in the other direction.

rconti

The thing that always gets me is that a top fuel dragster's engine only rotates something like 540 times in an entire quarter-mile run.

t0mas88

The visualisation is nice to compare with different engine types as well: https://random.ma.ttias.be/boxermotor My only complaint would be that there is no inline-6 while that does have some interesting properties in terms of balance compared to an inline-4 or V6.

rconti

Related; I've owned a number of inline 6 cylinder motors and currently have a flat 6 (boxster). I believe the math says the I6 is smoother than the boxer 6, but my perception is that the boxer is vastly smoother. I don't know how to account for that -- maybe because of where the motor is physically located, maybe it's due to the lack of a central driveshaft, or maybe it's something else entirely.

ifwinterco

People take it for granted how insanely good modern internal combustion engines are after 150 years of continuous improvement. A modern petrol engine is a miracle in terms of reliability, performance, smoothness and (relative) lack of harmful emissions

ramshanker

A simple framing for reference. Electrical Grid Frequency: 50 Hz = 3000 RPM. 60 Hz = 3600 RPM. So, for Gaming Monitors 144 Hz = 8640 Hz.