Timeline for Does a diesel piston engine's power decrease more slowly with altitude than with an AVGAS engine?
Current License: CC BY-SA 4.0
19 events
| when toggle format | what | by | license | comment | |
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| Nov 26, 2021 at 12:23 | comment | added | MSalters | @Vikki: Europe has strict environmental regulations that favor turbocharged engines. As Jpe61 notes, in the US gas is cheap and regulations lax, so NA engines are still relevant there. | |
| Nov 25, 2021 at 13:23 | comment | added | Jpe61 | @vikki not quite, for example Mazda is still firmly settled in naturally aspirated engine development with the Skyactive engine family. And in US there is a plethora of NA engines both in production and development. All diesel engines are FI these days though. | |
| Nov 25, 2021 at 8:54 | comment | added | Jan Hudec | @JetCityMatt it's not a strict implication. It is flat-rated, because that power curve is most desirable they can get for engine weight and efficiency, and being turbo-charged is precondition for that. | |
| Nov 25, 2021 at 8:01 | comment | added | JetCityMatt | @Jan Hudec, I understand your comment to mean that the AE-300 is flat rated because it is turbocharged. Because "nobody flat-rates a normally aspirated engine (non-turbo-charged), because it makes basically no sense". Am I understanding correctly? | |
| Nov 25, 2021 at 7:55 | comment | added | Jan Hudec | The important part is not that the engine is turbocharged, but that it is flat rated. That is a property independent of turbo-charging, though nobody flat-rates a normally aspirated engine (non-turbo-charged), because it makes basically no sense. But a turbocharged engine does not have to be flat rated. | |
| Nov 25, 2021 at 7:30 | comment | added | JetCityMatt | @jamesqf The overpressure that turbos create on a car engine is the reason I want to add one to my Nissan 240SX! | |
| Nov 25, 2021 at 4:45 | comment | added | jamesqf | Also note that turbochargers don't necessarily maintain sea level pressure. At least in automotive use (not that familiar with aircraft ones) they create an over-pressure of 6-8 PSI at sea level, and can maintain that 20-22 PSI intake pressure up to some considerable altitude. | |
| Nov 25, 2021 at 3:16 | history | edited | JetCityMatt | CC BY-SA 4.0 |
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| Nov 25, 2021 at 3:12 | comment | added | JetCityMatt | @Vikki, I haven't kept up with the specs of current autos in the last 12 years. To my knowledge turbos (and their additional cost and complexity) have historically been used on gasoline engines to increase performance. As Jpe61 mentioned, VW group has used them on low-power engines, likely to get more horsepower out of a small engine (which likely improves fuel efficiency). Years ago I test drove an ecoboost Ford Focus with a very small turbocharged engine that shut off when you came to a stop and then restarted itself when you hit the gas. | |
| Nov 25, 2021 at 2:27 | comment | added | Vikki | I thought essentially all auto engines nowadays were turbocharged? | |
| Nov 24, 2021 at 23:28 | history | edited | JetCityMatt | CC BY-SA 4.0 |
Diesel engines often are turbocharged- instead of always. Defined "Naturally Aspirated".
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| Nov 24, 2021 at 23:26 | comment | added | Jpe61 | Many actually, vag group specializes in poorly performing small turbo cars 😄 their lineage of barely over 1 liter tsi/tfsi engines is just hideous. | |
| Nov 24, 2021 at 23:20 | comment | added | JetCityMatt | @Jpe61 My intuition told me not to type that diesel engines required turbochargers but I did it anyway. :) I will change it. What was the slow turbo car that you drove? | |
| Nov 24, 2021 at 20:21 | comment | added | Jpe61 | ...and the use turbo chargers is by no means restrected to high performance gasoline cars. I've driven turbo charged gasoline cars that were desparately sluggish. | |
| Nov 24, 2021 at 20:16 | comment | added | Jpe61 | I strongly suggest editing this answer a bit. Diesel engines do *not need any kind of forced induction to function, the pressure required for ingition is achieved by high compression ratio. The reason most of them are equipped with FI, is that they are incredibly sluggish if naturally aspirated, and as such unsuitable for aviation use and many other applications as well. | |
| Nov 24, 2021 at 4:14 | vote | accept | Santiago Lorenzo | ||
| Nov 24, 2021 at 4:12 | vote | accept | Santiago Lorenzo | ||
| Nov 24, 2021 at 4:14 | |||||
| Nov 24, 2021 at 4:03 | history | edited | JetCityMatt | CC BY-SA 4.0 |
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| Nov 24, 2021 at 3:49 | history | answered | JetCityMatt | CC BY-SA 4.0 |