Comments by "Oblithian" (@Oblithian) on "Engineering Explained" channel.

  1. I would point out that a double efficiency rotory is still inefficient by modern standards, but certainly good enough to make it non-prohibitive for most buyers.
    55
  2. This car.... Facepalm.
    21
  3. Can you make a drawing illustrating exhaust crackle when letting off the throttle? (Not that it's a bad thing, it just sounds cool)
    20
  4. I declare this test biased and worthless. Without knowing who made which pads or that a reasonable selection of pads was done we cannot assume the manufacturer did not select their worst competition for this test. It might as well be the Chevy tool box test. Not to mention it does not account for material differences. Every brake pad will be different. However, ceramic vs semi-metallic pads have known differences in braking properties. Picking and choosing which pad is what material can easily skew the results in the desired favour.
    15
  5. lol. Whenever the media reports on scientific research.
    14
  6. You missed the Cons
    13
  7. I don't agree that pushrods are simpler/more reliable. Perhaps simpler than a sohc depending on the design, but DOHC engines are generally only cams and lifters it doesn't get much more simple than that (by component number, and directness anyway). With DOHC you move the complexity from a bunch of small oscillating parts to a few large rotating ones. There is sturdiness in size. Weight is definitely an advantage.
    10
  8. Given the number of microfisures that accumulate in a cylinder head, the chances of head leaking coolant probably increase, especially given past VW quality issues. But yes an actual exhaust leak would theoretically be lower given the cooler temperature, thicker walls, and a huge reduction in mated-surface area.
    9
  9. If Toyota built the car and bought the engine I would be ok with it. If toyota bought the car and made the engine, I would be less ok with it, but more ok than it stands. But Toyota bought both and modified the exterior... at the BMW factory.
    9
  10. lsd would certainly make it better
    8
  11. The people most upset are the supra fan's who love the label not the car, and see people voicing concerns. Then the people who loved and bought Supras brand new (well over 30 yrs old) who don't see the cars they like. The 2JZ fanatics will always be obsessed with the 2JZ, those ones are upset an old engine wasn't reused... but that would be ridiculous anyway. They're just loud more than anything. ...Then there's everyone else who just finds Toyota's lack of committment amusing, and the car a bit underwhelming for the hype.
    8
  12. hahaha. As an aside That Guy, yes a new car for that cheap is going to be a good deal with almost no exception. But VWs do have poor reliability down the road (contrary to popular conceptions).
    7
  13. #WheelLockUp
    7
  14. Don't you know? Telling americans they should shed a few pounds is a losing battle.
    7
  15.  @youngroosevelt38  Maybe the drunk recollection of the FT-1, It is definitely restricted to the bodyshape of the Z4. But where changes were made, it has the angular appearance of the current Toyota line... Which is where a lot of the ugliness comes from.
    6
  16. That is a lot of money. At least the v12 BRZs were novel.
    6
  17. If youtube allowed picture comments I would be posting a Gif of the guy shelling out cash, but have clutches insted of dollars.
    5
  18. 1. No it is not always best, we will go to 2 and then come back. 2. As answered above, generally acceleration in lower gears is more efficient due to mechanical advantage in gearing. At higher gears you have less torque so you must dump more fuel in to produce the torque needed to increase the speed (then there's also engine and drivetrain momentum). (Back to 1) So when you are accelerating or will need to accelerate and you are in a high gear, you are wasting a lot of fuel due to the increased load. However, cruising on a flat surface you want a higher gear (eventually there are diminishing returns) because at lower gears your engine's speed must be much higher to maintain that speed (engine speed is related to, though not the exclusive determinate of fuel use). You want to seek the balance point where the engine is spinning as slow as possible, while doing as little work as possible for the given speed (if you plotted them on a line graph you would find an intersect). If you look at torque curves your engine's torque will sharply increase after a certain rpm. If you let the rpms drop too low the torque will be bellow that which is needed to maintain your speed and the engine will stall. If you are "lugging the engine" as described, you are pushing it to the limit of what it can do, and that makes your engine sad, and everyone else angry. Forced induction changes the curves so it will affect where the point of maximum fuel efficiency is , otherwise it is largely the same theory.
    5
  19.  @jdmr1c3ing  They didn't though, they just changed the paneling (and added a roof) likely based on the M coupe. It still will be made at the same factory and likely involved BMW engineers. It's not like Toyota built a chassis and is having the parts shipped to be installed. Or that the subframe is different, or suspension, etc. At least the interiors look different *No wait it is based on the previous generation z4. Still, some difference, and I very much appreciate that.
    5
  20. sitcommander Then does that mean his tractor is basically a P1?
    3
  21. Manual transmission, forced induction/exhaust, suspension, tires.
    3
  22. Rev hang is so annoying some times.
    3
  23.  @gummostump4217  Yes, studded tire tests in my country show that they are good on pure ice but worse on mixed surfaces and dry pavement (than an identical but unstuddable design).
    3
  24.  @psykoklown874  Some brands create the same tread but one is studdable, and the other is not. That provides the best test, as making a tire studdable alters its unstudded performance.
    3
  25. Yeah, almost every GT86 owner has buyers remorse because of the power. They bought a project car, at factory prices. I imagine the supra will be similar, because their friends with f-types, or the poor people with Mustangs will be faster.
    3
  26. ...can't you just take his numbers and the cost of electricity? Multiplied by the distance?
    3
  27.  @Aurora_v_cali  Nissan wasn't perfect before, but yes the shift in priorities and strategy had the most significant impact (including part sharing between the two).
    3
  28. Good luck on your exams!
    3
  29. It only helps with going up hill, acceleration, and getting un-stuck. The same way TCS does't help braking, that's ABS... and that is supposedly less effective than properly braking without abs (in bad weather). STM may help with corners ...if it was designed for different conditions, otherwise it may just cause a traction loss. But some vehicles are just bad at ice or on road snow (like Jeeps, which surprised me... Particularly wranglers). It mostly comes down to suspension, weight distribution, and tires/chains/studs. I suppose, if you are downshifting having 4wd or awd would also help, in that it spreads the torque load.
    3
  30. I imagine the answer is "obviously yes", but noting that "just because a car has wider tires than a different car, doesn't mean that's the only determining factor" (especially of braking distance). If every car had the same tire design and compound, and if the braking test was performed with narrow and wide tires, the braking would be better with likely no exception.
    3
  31. You could get some more with a potato.
    3
  32. Please wash your undercarriage more.
    3
  33. That was true once, but a bunch of bus routes got cancelled where I live, now it's a flight or driving... and for the price of flights here you might as well hire a driver.
    3
  34. the pads that wear fastest should improve rotor life. But for my car, $15 per rotor at Rock Auto means new rotors every(or ever other) pad change.
    2
  35. Almost 28 and 42. I understand completely.
    2
  36. Would you mind increasing the video's output volume, and re-uploading?
    2
  37. *I would throw in an LSD when swapping the transmission.
    2
  38. ...How many cars does he have?
    2
  39. As long as you can put 3rd party softwar in instead, I think selling the ability to use equipment installed in every car is fine. ...But if you can't, it's absurd, obviously the money isn't needed to pay for the hardware, and copying software costs virtually nothing. If they want to sell the feature but will not allow the opportunity for 3rd parties to compete (maybe do it better for less) they should sell it all as a single option, or install it in every vehicle and allow mass production to lower the per/unit cost of goods sold (i.e. the R&D expenses).
    2
  40. It really blows.
    2
  41. At first glance I thought you were covering the history, this is much more interesting (and less well known).
    2
  42. I would like to see this, he has better controls.
    2
  43. The AWD system sounds like it would have a much better driving experience, sliding seems very natural and predictable compared to some other approaches.
    2
  44. sassy muons?
    2
  45. lol that's not even good for performance.
    2
  46. Yes the fuel consumption will be lower at a given moment accelerating in a higher gear. However, over the period of acceleration is it actually more efficient than using each gear to the fullest in the shortest time? (Is net fuel consumption during acceleration lower in a high gear or a low gear, and at what point does it change?)
    2
  47. technically it jerked it lol
    2
  48. So you're saying... people like jerking, because it's exciting?
    2
  49. I realize this isn't really related, but I can either raise my redline by 1000 rpm or increase my compression ratio by 1. Yes they stress different components in different ways (both would also affect piston speeds but to a different extent), and obviously require different tunes, but what would be the relative effect of each? My guess is that the compression ratio would improve torque and power more broadly where as the rpm limit would merely allow more power at the end of the rev range. ...Though I suppose I would have to try them both to find the exact power and torque figures in this specific application.
    2
  50. i love me some hot air intakes, best way to maximize the decrease in air density. The effect of a heat shield should be easiest to test, just tape in some cardboard behind the intake as a temporary air box/wall. Testing a relocation would cost more, but I am interested in seeing how both affect the IAT, so if you're willing to try. I will certainly watch.
    2