There is a very good engine simulation software:
https://github.com/Engine-Simulator/engine-sim-community-edi...
Internal Combustion Engine (2021)
81–90 of 112 posts
Re: Internal Combustion Engine (2021)
#82Earlier quoted context omitted.
Some engines are also substantially cooled by oil, but those are either older designs (think “air-cooled” Porche) or industrial prime-movers.
Some engines, especially high mileage engines from Detroit, are also substantially fueled by oil. In a sense.
Then there's the ones with the puff of blue smoke
Re: Internal Combustion Engine (2021)
#83Wonderful but it irritates me that so many descriptions of internal combustion engines refer to "explosions" of the fuel. You don't want that. It causes knocking and pinging and engine damage. You want a controlled burn that generates heat smoothly.
There are videos on YouTube of what the combustion actually looks like in slow motion. It's fast, but far less violent than an "explosion".
I don't think it's any slower than the dust explosions that occasionally happen in factories or grain silos. Although those do appear more violent due to the scale & damage.
Re: Internal Combustion Engine (2021)
#84Why does this show a 4 cylinder engine firing as two pairs? My ignorance is on display, surely it's more subtle and there are 4 distinct phased firings not two?
Re: Internal Combustion Engine (2021)
#85Why does this show a 4 cylinder engine firing as two pairs? My ignorance is on display, surely it's more subtle and there are 4 distinct phased firings not two?
There are four distinct firings. Look for the little yellow poofs. The pistons move in pairs for balance (vibrations). Each piston is doing one of the four strokes (suck, squeeze, bang, blow is the crude way to remember) at a given time. None of them are doing the same thing at a given time.
Re: Internal Combustion Engine (2021)
#86Worth noting the design of the internal combustion engine hasn't changed much in 50 years. The thing that has changed is the control systems. What used to be a primitive mechanical way of mixing fuel and air (the carburettor), is now an electronic fuel injection system, with the fuel air ratio very carefully matched to reduce pollution (fun fact: modern cars release so little carbon monoxide, you won't kill yourself…
The orbital family of ICE engine of 1972 has seen a lot of ongoing innovation and crossover variations with other rotary engines (like the Wankel) in past decades - such engine variants have had a major place in UAV (and other) drones.
Re: Internal Combustion Engine (2021)
#87Who is this person. A beautifully written and illustrated explanation of a fascinating machine. A website filled with other explanations of other things, also wonderfully written and clearly explained. An instagram filled with beautiful landscape photographs, an "X" page consisting only of links back to this blog, and a Patreon with hardly any more information that that. I love this. Fantastic content. Zero ego. And…
There is no AI use here. I'm somewhat offended by the suggestion even though I have no relation to the author. Bartosz has been shredding for a long time now. His javascript is also unminified and perfectly readable, making it a great reference for study despite not being advertised on his pages. The animations are all hand-made. The guy is cooking. To suggest that any of it is AI is an utter blasphemy. AI is for noo…
I agree completely, and if you re-read what I wrote I didn't exactly suggest that it was used. But if he's reading this I'd hope he'd nevertheless accept my apology for even the hint of a suggestion.
Happy to find someone else who hates that infernal technology as much as I :)
Re: Internal Combustion Engine (2021)
#88Earlier quoted context omitted.
What I am surprised by is that cams are still used to operate the valves. Given to how precise these need to be these days, I would've guessed they would've switched to electronically actuated valves.
Fiat (and other's I'm sure) have the [MultiAir system]( https://www.caranddriver.com/features/a16580674/fiats-multia... ) which doesn't use cams to actuate valves And here's an example of someone that retrofitted a Miata to use a similar [air-actuated valve system]( https://youtu.be/E9KJ_f7REGw )
The very first image at the very top of the MultiAir article shows, prominently, a camshaft and the cams used to actuate the valves.
Re: Internal Combustion Engine (2021)
#89Earlier quoted context omitted.
I don’t think it’s pretty well established, there are cars that will happily stop and start the engine multiple times per minute, e.g. Toyota hybrids with their “HSD” drivetrain. It just requires some engineering.
I don’t think Toyota engine does traction from low rpm. Electric motor does it, and moments later already well spinning engine gets the load. Hearing regular start-stop on intersection gives me sorry feeling for the engine.
Hybrids generally command the ICE to run when under higher loads or cold conditions, but they do get a bit of a break under low load conditions when they’re warmed up.
But they also start and stop way more than a gasoline-only car with stop-start. Because they stop and start repeatedly while driving too. Series hybrids even more so.