Comments by "Terje Oseberg" (@terjeoseberg990) on "Engineering Explained" channel.

  1. They need to use the hydrogen instead of the air conditioner. They might also use it to run a turbine, since it’s under pressure.
    32
  2. wino0000006 Question: Is It Bad To Engine Brake With A Manual Transmission? Answer: No, it is not bad to engine brake with a Manual Transmission. It is also not bad to engine brake with an automatic transmission. That's why they have lower gears than drive. They're there specifically to allow you to engine brake.
    23
  3. Ernst Otto Oehler, 2-stroke engines have bad emissions because when the intake air pushes the exhaust out, if you want to maximize performance (not efficiency) you design it to make sure it pushes ALL the exhaust out. This results in some unburnt air and fuel to be pushed out the exhaust as well. This unburnt fuel in the exhaust is the cause of bad emissions for 2-stroke engines. However, this engine and any direct injection 2-stroke engine can use clean air with no fuel from the intake to push all the exhaust out with no unburnt fuel. Then, after the exhaust port has closed, or the exhaust valve has closed, it can inject the fuel into the compressed air in combustion chamber. This completely eliminates the bad emissions that are typical of 2-strokes.
    12
  4. drake6143, Maybe they're reading the question but don't understand English.
    6
  5.  @TheAgentAssassin , Your clutch only wears out when it's slipping. If you match the RPM of your engine to your speed and release the clutch quickly, there's very little wear on the clutch. So, when downshifting, you're not using the clutch to slow down, you're using the engine to slow down.
    5
  6.  @gman76utube , Why is an electric vehicle impractical? You can charge it at home so you never have to go to a gas station again. How many people actually drive over 300 miles a day? Heck, how many people drive over 100 miles per day? All you have to do is plug it in every night when you get home. The ONLY time you'll ever have to go to a charging station is when you go on a long trip. If you actually do drive 300 miles a day, then I agree, it would be impractical. But seriously, how many people actually do that?
    5
  7. dan428, Most Americans drive a car with an automatic transmission. Most Europeans drive a car with a manual transmission. I have no clue why you would find this arrogant and demeaning. Obviously someone who has never driven a car with a manual transmission is unlikely to know anything about this.
    5
  8.  @Pappy63 , It takes a whole hell of a less than 3 minutes to plug in your electric vehicle when you get home and unplug it when you leave. Imagine NEVER having to go to a gas station EVER again.
    3
  9.  @Aashishkebab , You’re confused. I’m suggesting using the hydrogen that’s coming out of the tank right before it enters the engine, not the hydrogen inside the tank. Obviously heating up the hydrogen in the tank would be bad. I thought that I didn’t need to explain that. Looks like I was wrong.
    3
  10. Iz Meorbin, Please explain why this engine spits unburnt oil.
    3
  11.  @jasondonnaker4954 , Do you seriously believe that thing looks, "pretty"? Are you nuts?
    3
  12.  @Chris-Brown- , Yes, it is.
    3
  13. smig smög, Why would it be bad to engine brake in a 2 stroke car?
    2
  14.  @Aashishkebab , Is it better for the hydrogen to be cold when it’s injected into the engine? As it decompresses from the tank it’s going to become extremely cold. If there’s a benefit to that, then it might be worth having an air conditioner. But if there’s no benefit, why not get cold from there rather than including an air conditioner on the vehicle?
    2
  15. Satunnainen Katselija, I never said diesels were clean. What I did was explain why a typical 2-stroke is spewing out unburnt fuel. They also spew out unburnt oil along with that fuel. Regarding diesel, I know they pollute more than gas engines. Is it possible to fix this? I have no idea. And I too am disappointed that they failed to mention anything about emissions in this video.
    2
  16. Jim Kiley, Regarding the 2 levers with the apposed pistons vs. 1 lever on a conventional single crankshaft engine. In order to obtain the proper compression ratio, the lever arm will be half as long on the 2 lever engine than on the single lever engine. Therefor the torque produced on each of the 2 levers will be half that of the 1 lever. The net result is that half the torque times twice the number of levers is the same as twice the torque on half the number of levers.
    2
  17. Won't that reduce engine braking?
    1
  18. How about emissions? Will this pass smog in California?
    1
  19. Cool. You answered that question.
    1
  20.  @MURD3RD , Very good point. I hadn't thought of that.
    1
  21.  @MrManniG , Good answer!
    1
  22.  @turbodiesel4709 , Hmmm... But, when you shut off the throttle, there's a bare minimum of fuel deliver for idle, but the engine might be going quite fast while engine braking. Although there might not be no fuel, there might be insufficient fuel.
    1
  23.  @turbodiesel4709 , I doubt engine braking with a 2-stroke would cause a sudden failure. It would just increase wear and tear. The engine would just wear out faster.
    1
  24. How about instead of just using the corn, they use the stalks too?
    1
  25. Corn stalks should be similar to grass, right?
    1
  26.  @Pappy63 , By the way, I hate going out of my way to go to a gas station. It takes time to drive there, time to fill up, time to pay, and time to leave. A whole hell of a lot longer than 3 minutes.
    1
  27. …
    1
  28. There's something you failed to discuss. When you buy a new car to replace your old car, you're likely to sell your old car to someone else who will continue to drive it. This means that you're providing a cheap car to someone else who then won't be buying a new electric car. So, selling your old car to replace it with a new electric car doesn't help anything. What's important is that everyone who's going to buy a new car anyway, or has a car that's at the end of it's life buys an electric car. In other words, everyone needs to stop buying new gas powered cars, and manufactures should stop manufacturing new gas powered cars.
    1
  29. amnottabs, There's a 1st and 2nd gear on automatic transmissions for a reason. That reason is because engine braking is what you're supposed to do even with an automatic transmission.
    1
  30. Sean Angermeier, Is that peak torque at the crankshaft? Or after being geared down (IE: after the transmission)? Because with gears, you can create as much torque as you want. What's more important is how wide is the power band? The wider the power band, the fewer gears you need in your transmission.
    1
  31. I believe that the torque of diesel engines is higher than the torque of gas engines because the greater compression ratio of diesel engines requires a longer lever than that of the lower compression ratio gas engine. The compression ratio is nearly double, so the lever arm on the crankshaft is nearly double the length and thus nearly double the torque for the same size piston. However, since that piston is moving nearly twice as far, the displacement will be nearly double as well.
    1
  32. What about an electric oil pump that starts pumping the oil before starting the engine?
    1
  33. What's wrong with singing cats?
    1
  34. Actually, acceleration is only related to torque. The formula for acceleration is F = MA or Force equals Mass times Acceleration, or A = F/M. Since the wheels are a fixed diameter, the number of pounds of force that the tire is exerting on the road is constant for a constant torque. Therefor, if we were somehow able to keep the torque of the engine constant at every RPM without switching gears, then the acceleration would remain constant at every speed for each gear. However, because the torque of an engine is not constant for every RPM, we are required to use a transmission to increase the torque at higher speeds relative to what you'd get if you didn't have a transmission. For maximum acceleration you need to maximize the torque at the wheels. Because horsepower is force x distance / time = torque x RPM, more horsepower at higher RPM can be converted to more torque at lower RPM which is exactly what the transmission does to maximize the torque at the wheels for a given speed.
    1
  35. Torque X RPM = Power What the transmission does is convert one torque value to another by changing the RPM. Physics dictates that the output power is equal to the input power minus the inefficiency of the transmission due to friction. Without friction, the power will remain constant regardless of the RPM or torque.
    1
  36. So that’s around $1/1000km?
    1
  37. Or, how about a temperature sensor that doesn't charge the batteries while they're too hot? That way you can plug it in right away and it can figure out when to start charging it on it's own? But, that's lame. If you need to drive the car soon, why would you want to wait before you start charging it?
    1
  38. Uhhh, it's called, "Granny Low".
    1
  39. So what's the wheel torque in Granny Low at 1,000 RPM? Can I tow my 10,000 lb sailboat up a 20 degree incline a 1 mph without slipping the clutch?
    1
  40.  @sebione3576 , OK. Then load them both to full capacity and try the test again. Then try it with larger and larger Fords until the Cybertruck loses.
    1
  41.  @rileynordin31 , So, you want to test the traction of the tires? Hmmm... Which one uses softer rubber?
    1
  42. I don't believe the foam in the Tesla tire is for acoustics. It's for run flat so you don't need a spare tire.
    1
  43. cptnoremac, You must really enjoy changing your brake pads an swapping out your warped rotors.
    1