Europe
News and information from Europe ๐ช๐บ
(Current banner: La Mancha, Spain. Feel free to post submissions for banner images.)
Rules (2024-08-30)
- This is an English-language community. Comments should be in English. Posts can link to non-English news sources when providing a full-text translation in the post description. Automated translations are fine, as long as they don't overly distort the content.
- No links to misinformation or commercial advertising. When you post outdated/historic articles, add the year of publication to the post title. Infographics must include a source and a year of creation; if possible, also provide a link to the source.
- Be kind to each other, and argue in good faith. Don't post direct insults nor disrespectful and condescending comments. Don't troll nor incite hatred. Don't look for novel argumentation strategies at Wikipedia's List of fallacies.
- No bigotry, sexism, racism, antisemitism, islamophobia, dehumanization of minorities, or glorification of National Socialism. We follow German law; don't question the statehood of Israel.
- Be the signal, not the noise: Strive to post insightful comments. Add "/s" when you're being sarcastic (and don't use it to break rule no. 3).
- If you link to paywalled information, please provide also a link to a freely available archived version. Alternatively, try to find a different source.
- Light-hearted content, memes, and posts about your European everyday belong in other communities.
- Don't evade bans. If we notice ban evasion, that will result in a permanent ban for all the accounts we can associate with you.
- No posts linking to speculative reporting about ongoing events with unclear backgrounds. Please wait at least 12 hours. (E.g., do not post breathless reporting on an ongoing terror attack.)
- Always provide context with posts: Don't post uncontextualized images or videos, and don't start discussions without giving some context first.
(This list may get expanded as necessary.)
Posts that link to the following sources will be removed
- on any topic: Al Mayadeen, brusselssignal:eu, citjourno:com, europesays:com, Breitbart, Daily Caller, Fox, GB News, geo-trends:eu, news-pravda:com, OAN, RT, sociable:co, any AI slop sites (when in doubt please look for a credible imprint/about page), change:org (for privacy reasons)
- on Middle-East topics: Al Jazeera
- on Hungary: Euronews
Unless they're the only sources, please also avoid The Sun, Daily Mail, any "thinktank" type organization, and non-Lemmy social media. Don't link to Twitter directly, instead use xcancel.com. For Reddit, use old:reddit:com
(Lists may get expanded as necessary.)
Ban lengths, etc.
We will use some leeway to decide whether to remove a comment.
If need be, there are also bans: 3 days for lighter offenses, 7 or 14 days for bigger offenses, and permanent bans for people who don't show any willingness to participate productively. If we think the ban reason is obvious, we may not specifically write to you.
If you want to protest a removal or ban, feel free to write privately to the primary mod account @EuroMod@feddit.org
view the rest of the comments
Also engine braking
Ha! What are gears for in a car?
I agree, if you've got 'em its far better.
If you mean electric vehicles, they are much better at engine braking than fossil fuel vehicles, because the braking power can be precisely applied through the motor acting as a generator. In Toyota hybrids as well. The number of gears doesn't really matter in this case.
Even a gas engine doesiengine breaking pretty good. Not as controllable as a electric but still a major difference. Diesels don't do much though (unless you have a 'jake break' - which I've never seen in less than a semi)
In my experience diesels brake better than petrol engines. Maybe it's because of their longer stroke and better compression. But in any case a manual transmission is best.
That is not expected - while a diesel has more compression, that compression matters zero (other than friction losses - which might be what you are feeling) since all the energy lost in compression is returned in the next part of the cycle when the energy is returned. Unless you have a "jake brakes" which opens the exhaust valve at the top of the compression stroke thus venting the energy to the atmosphere instead of returning it to the power stroke.
A gas engine has a throttle plate which means when the engine is coasting very little air goes into the cylinder and so on the power stroke the low pressure in the cylinder is fighting against the higher air pressure in the engine.
I agree manual transmissions are best, but I'm a minority (I live in the US, other parts of the world prefer manuals) and so I can rarely find them. That said, an automatic in low gear gives plenty of engine braking.
Isn't it the case that diesel engines continue to compress air while petrols don't? This plus the significantly longer stroke might account for some of the difference. Yes the air is decompressed right afterwards but significant amounts of work must be lost as heat.
I don't know what to say. It's just my personal experience. While driving different cars the diesels always braked much more, and at lower RPMs. Coasting down an incline, put the diesel in 3rd, it will spin up to 2000 then go down to 1600 and stay there, braking the car 10-15 km/h. The equivalent petrol will spin up to 3000 and stay there, and not reduce the car's speed, just keep it from accelerating. Something like that happened across many different cars and engine displacements. Maybe it's because the petrols go down to as little as 1L of displacement and 3 cylinders while the smallest diesels are still at 1.6L and 4. Or it's because the diesels are always turbocharged, while the petrols are sometimes naturally aspirated.
Some is lost as heat, but most is returned. If you are not comparing like sized engines you won't really be able to tell much. RPMs going up to 3000 is a sign this is working - the more RPM the more resistance.