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Internal Combustion Engine (2021)

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Re: Internal Combustion Engine (2021)

#91

Post by kube-system »

raffael_de wrote: post #55
Toutouxc wrote: post #41

Earlier quoted context omitted.

You’re replying to a post that says that “explosion” doesn’t imply “detonation”.

and that is not strictly correct. it's called combustion engine and not explosion engine for a reason.

But it is strictly correct. Deflagration is the definition of low (i.e. subsonic) explosive.

Combustion is a broader term — combustion just refers to burning. And the reason it is called an internal combustion engine is to contrast it from its predecessor combustion engine designs - the external combustion engine.

More precisely, the type of combustion happening in an ICE engine is (low) explosive.

https://en.wikipedia.org/wiki/Explosive#Low

Re: Internal Combustion Engine (2021)

#92

Post by zuzululu »

Sohcahtoa82 wrote: post #71
zuzululu wrote: post #63

Earlier quoted context omitted.

the problem is where these lithiums are sourced from and that raises the costs of human rights

Questioning the lithium source is valid, but also a red herring when we're talking about environmental impact. But yes, battery minerals can involve human rights abuses. But ICE vehicles are also built from steel, aluminum, copper, rubber, electronics, and metals that can involve forced labor, unsafe mining, land displacement, pollution, or exploitative labor. The ethical issue is supply chain due diligence across th…

what car company is using forced labor as you are claiming that is pretty serious, almost all except China, are built in countries with strong labor unions.

what I really hate is that EVs have given people a false sense of superiority that seemingly stems from their curious unwillingness to look at the ugly environmental and human rights abuses around the lithium sourcing.

Re: Internal Combustion Engine (2021)

#93

Post by DeathArrow »

londons_explore wrote: post #25

Worth 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…

And there are also other parts for reducing the pollution like DPF, EGR and Adblue systems.

Unfortunately they also reduce the reliability.

Re: Internal Combustion Engine (2021)

#94

Post by ggm »

edot wrote: post #85
ggm wrote: post #84

Why 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.

Thank you. TIL!

Re: Internal Combustion Engine (2021)

#95

Post by defrost »

zuzululu wrote: post #92
Sohcahtoa82 wrote: post #71

Earlier quoted context omitted.

Questioning the lithium source is valid, but also a red herring when we're talking about environmental impact. But yes, battery minerals can involve human rights abuses. But ICE vehicles are also built from steel, aluminum, copper, rubber, electronics, and metals that can involve forced labor, unsafe mining, land displacement, pollution, or exploitative labor. The ethical issue is supply chain due diligence across th…

what car company is using forced labor as you are claiming that is pretty serious, almost all except China, are built in countries with strong labor unions. what I really hate is that EVs have given people a false sense of superiority that seemingly stems from their curious unwillingness to look at the ugly environmental and human rights abuses around the lithium sourcing.

> the ugly environmental and human rights abuses around the lithium sourcing.

Be specific, please, and for completeness compare to the impacts of fossil fuel extraction and production for ICE vehicles.

Lithium supply chains: Environmental impacts and trade-offs analysis - https://www.sciencedirect.com/science/article/pii/S235248472...

  Most world lithium production is attributed to spodumene mining in Australia, Brazil, Zimbabwe, and Canada, and to brine operations in Chile, China, and Argentina

Re: Internal Combustion Engine (2021)

#96

Post by trhway »

kube-system wrote: post #89
trhway wrote: post #48

Earlier quoted context omitted.

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.

>But they also start and stop way more than a gasoline-only car with stop-start.

they do it very differently. My Prius never does that coughing sound that the start-stop engines frequently do. The powerful electric motor in Prius spins the engine to at least 1000rpm before fuel is injected. That way it is much easy on the engine and much more fuel efficient too.

Re: Internal Combustion Engine (2021)

#97

Post by dotancohen »

vjvjvjvjghv wrote: post #56

This should probably be called “Four Strike Engine”. There are other types of ICE that work differently.

Four stroke.

And why not call it "Four cylinder four stroke ICE" or "Inline four cylinder four stroke ICE" or "Inline four cylinder dual overhead cam four stroke ICE"? Of course there are other forms of ICE, the description does not need to detail exactly which subtype is described.

Re: Internal Combustion Engine (2021)

#98

Post by dotancohen »

dylan604 wrote: post #82
dotancohen wrote: post #72

Earlier quoted context omitted.

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

Yeah, that's exactly what I meant.

Re: Internal Combustion Engine (2021)

#99

Post by bob1029 »

gomoboo wrote: post #67
toxik wrote: post #38

Earlier quoted context omitted.

I thought it pretty well established that auto on/off is bad for the engine, as is intermittently turning off some cylinders as some do. Is that wrong?

“While aggressive start cycles (>20 cycles per day) could lead to premature failure in the starter system of light- to medium-duty commercial fleet vehicles, modern fuel injection and engine control systems have eliminated any issues associated with drivers of typical light-duty vehicles turning the engine off while stationary for short periods and restarting the vehicles for https://publications.anl.gov/anlpubs/2015…

This paper reads like a high school science fair project with zero treatment for the concern originally presented (oil system pressure transients).

Re: Internal Combustion Engine (2021)

#100

Post by rstuart4133 »

left-struck wrote: post #80
londons_explore wrote: post #25

Worth 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…

> fun fact: modern cars release so little carbon monoxide, you won't kill yourself by starting one in a garage Modern cars still release as much CO2 as older cars… which is still incompatible with human respiration.

Another fun fact: the body's suffocation response isn't caused by lack of oxygen. It's caused by high CO2 levels in the blood [0]. If your car floods the air with CO2, you will respond like someone is holding your head under water.

Carbon monoxide kills you by binding more strongly to the hemoglobin than the O2. You don't notice, because the CO2 removal mechanism continues to work fine. You'll usually die before realising anything is wrong.

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