Hearted Youtube comments on Engineering Explained (@EngineeringExplained) channel.

  1. The smile on his face when talking about those sensors is like mine when I talk about video games lol.
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  2. I appreciate a lot your work: it's great, keep going! Unfortunately I have to say something about the topic of this video: First of all It's true that Diesel engines have higher compression ratios resulting in higher Peak firing Pressures and consequently higher values of torque BUT this is not the "true reason" why CI engines have more torque COMPARED to SI ones. In fact, while the SI engine works always stoichiometric (or even slightly in the rich side (relative A/R (Air Fuel ratio) ~0.9)), the Diesel engine cannot work anywhere close to the stoichiometric A/R due to t bad air utilization (min relative A/R is in the order of 1.2-1.3) thus resulting in ~20% less fuel injected (in mass) for the same quantity of air in the cylinder. Lower fuel injected means lower energy released in the combustion and so lower torque (this "base" 20% deficit is partially, but non totally, compensated by the higher compression ratio and higher Diesel specific energy). If you compare the torque figures of old naturally aspirated diesels with NA SI engines of the same time you'll verify what I'm saying. The second thing you mentioned is not wrong but it's not that relevant: the combustion of a Diesel engine is more efficient when it tends to a constant-volume combustion (like in the case of the IDEAL Otto cycle). For partial loads, the actual duration of the two combustion processes, even if they're fundamentally different, is comparable and I would say that there are so many variables involved (speed, temperature, fuel quality, turbulence in the clinder, etc) that is difficult to say which combustion process is the most efficient. However, at high loads, the combustion process of a SI engine is definetly occurring faster than a CI one since the latter has to fight against a "mixing controlled combustion" during which fuels struggles to find air to react with. (In fact, CI engines rotate slower than SI ones) For what concerns the third point you presented... it's just a false myth: the higher lever of a longer stroke is counteracted by the lower force resulting from a smaller bore. If you take the condensed formula to compute engine power you'll notice that bore and stroke are multyplied together giving as a result the displacement (longer stroke -> smaller bore). So, the reason why diesel engines have much higher specific torque than SI ones is turbocharging. Thanks to the very high allowed boost ratio it is possible to force a lot of air inside the cylinder and so it is possible to burn more diesel than gasoline (for a given displacement). This results in a much higher torque together with a more efficient engine. (Power output, unfortunately, si affected by the "slow" combustion process that doesn't allow the engine to rotate as fast as a SI engines). This comment doesn't want to be against you. You've always done a great job. It's just to make things a little bit clearer.
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  3. The camera work on the engine shots is top notch! I loved the valve cover fade-away to the DOHC. Great video!!!
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  4. Meanwhile people in Germany: "300 km/h is my cruising speed"
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  5. Yay!!! So glad to see you made it beyond 200!!!! The engineering part of this was super helpful and interesting as always, and I loved hearing your description of driving that fast! I only did half of that speed in this car, but I felt everything that you said, and looking as far ahead as possible really helps! Driving in the McLaren was actually my first time on a track! Twas my gateway drug I guess.... I autocross my Miata now cause I'm poor lol. Same feelings, different speed!!!
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  6. I want Ferrari to make lawn mowers
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  7. Holy crap I’ve always wondered about this thank you
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  8. You explaining supercars, this is too much, thank you, keep going.
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  9. The thing I love most about this guy is he does all the maths for us
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  10. Excellent report Jason! As an old, and I mean old, Ford guy, I love this stuff! The General keeps putting out powerful engines, especially for Corvettes, but a well thought out blown V8 just tickles my funny bone.
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  11. Dude this data is amazing! Every question possibly to be asked regarding the effects of fuel grade answered! And no your not too nerdy as you've mentioned in your other 10 things about the hellcat car video 😅😂
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  12. There is nothing like a good collaboration between two auto enthusiasts
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  13. Finally... a different perspective we can appreciate. Everyone else yammers on about the looks, the prestige, the exclusivity, the price.... You brought us the how-to's, the why's and the mechanical appreciation of this Rolls Royce. Thank you.
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  14. It's funny, I've also been taught to never let you gas tank be too low. As it will hurt you fuel pump operating at that amount. How things change but stay the same. Lol.
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  15. I love it! This was some awesome light hearted humor. We all know Engineers make cars to be assembled, not worked on! 😆
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  16. "On today's episode: Jason buys a Miata... Charles, buys a Miata, and a baby whiteboard comes out of a Miata.
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  17. HERESY! In all seriousness though, you do have very good points. I know a vast majority of people see driving as simply point A to point B, and an automatic makes a lot of sense for them. Personally, I've been driving a manual longer than I've driven an automatic and I hope I can keep it that way for as long as I can. Sure I won't win any drag races but I find it way more fun and engaging.
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  18. Thank you for the bananas. I wouldn’t have known how big the frunk is.
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  19. bro how many times are u gonna show me you plugging in that car !?
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  20. CVK: It's fast. You can do the math Jason: Challenge accepted! Does it just like that 😎🤘🏻
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  21. Koenigsegg innovation really is amazing.
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  22. mazda is a truly amazing car maker.
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  23. Excellent!!!! The only person that I know that can have 15 pages of text in engineering in a video less than 15 minutes long. Very dense content. With a whiteboard on the background? Priceless....
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  24. Check engine light is "Just part of being in the Volkswagen family" truer words have never been said 👏
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  25. It’s a turn-key toy, air conditioned and track ready that’s for sure. Performance is impressive and the transmission shifts lightning fast.
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  26. Put it in the crosstrek 🗣
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  27. Why not just fire 1000 times for 1000x efficiency
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  28. I am a big Tesla skeptic, and I believe this video makes one of the most objective takes on Tesla, even though it is a praising video. Thanks Jason!
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  29. "Hey there, you wanted to do a little more math"? Hell no, that's what we have you for.
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  30. It's more along the lines that reality is way more complicated than we typically perceive it to be.
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  31. But why buy the Stelvio when you can buy the Giulia
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  32. First thing I ask: What about rain? Lists off 3 things that's not rain, prepares to leave video "And lastly, what about rain?"
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  33. I know it’s a good day when I hear “Hello everyone and welcome.”
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  34. Breaking: Hyundai brings DRS to road cars
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  35. Me: man, I really gotta get back to Calc 2... Engineering Explained: yeah, but first, check this out.
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  36. Thank you so much for explaining this. These numbers are out of this world!! You have the ability to make work from the worlds best engineers clear and understandable for a whole lot more people. That's a gift not many people have. Thnx again!
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  37. This video convinced me to trade in my Raptor for a Crosstrek.
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  38. Your passion to explain and teach is notable, thanks Jason and wish your the best with your channel!
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  39. You can finally move your hands without caring for the wheel! Phew...
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  40. So is that the reason why front wheel drive turbocharged lawnmowers have top exit exhaust? I mean.. they're still mounted in the engine bay.. :o
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  41. I always click your videos thinking, "ah, I actually don't care that much, but I'll see what Jason is talking about". Then I stay for the whole thing.
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  42. the google over yahoo sticker should improve performance of anything!
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  43. "Perhaps someone bumped into the side of the garage when they were parking; didn't quite judge it right" Nice.
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  44. Thats why I use 13" and steelies lol
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  45. 9:08 Jason: "So here's 2 things we know are true. " Jason's hand: holds up three fingers 😂
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  46. 4:08 "90-95% at wot" that reminded me of when I use to drive small cc motorcycles. everything felt like a race on that thing
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  47. Had two engineers from Achates Power give a lecture for our Engines course at Cal Poly on their OP2S. It was a really interesting lecture. From what I remember they mentioned that the size of the engine was really holding back their production. They had mentioned that an OP2S was mounted in an F-series on an angle so that it could fit in the existing frame. Super cool stuff.
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  48. "Velocity squared over nOboDy CaReS" 🤣🤣
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  49. Who liked the video before they watched it?
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  50. I don't know what any of this means, but I have a strange urge to buy 140 cans of Le Croix.
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