Comments by "" (@Wingnut353) on "Engineering Explained" channel.

  1. That comes from it being a 2 stroke diesel they've always had good torque numbers when compared to contemporary 4 strokes because you get 2x as many power strokes per revolution.
    45
  2.  @ashutoshsinghchauhan2663  As well as extra complexity in spades... I guess its a German design so that checks out. It is questionable if it could meet emissions, and lacks the availability of techniques that achates power would be able to take advantage of with opposed pistons. This engine may scale down a bit better... but the complexity is a massive burden to this design.
    28
  3. Honda G1 insight engines last around 300-400k miles... so pretty good I guess. Not much different than other honda engines.
    16
  4. Exhaust and intake mixing isn't really a problem... and some gasoline engines are actually doing that to increase efficiency and clean burning. What it would do is decrease slightly the peak power output... and maybe a tiny hit to efficiency but the improvement due to it being an opposed piston 2 stroke likely far outweigh that (a 4 stroke needs 2x as many pistons to generate similar output or 2x the RPMs which also tends to less efficiency). Also I bet these engines sound awesome...
    13
  5. One of the most reliable vehicles ever produced... the Honda Insight G1... uses a gasoline motor + brushless fixed magnet HV DC motor. Basically the opposite of what you described... it is still one of the simplest hybrids though. The only engines that are more reliable are heavy truck engines.... my G1 has 300k miles on it. And the parks showing the most wear is the suspension not the drivetrain.
    12
  6.  James Smith  You mean fascist Japan? ... they are very capitalist these days, you might say 2nd generation capitalist, while we Americans have crappy crony capitalism they have collective capitalism (corporations are locked together in mutual agreements instead of free market) and are the 3rd largest buying power in the world. Unlike socialism Japan has private ownership of corporations and production of goods... however companies form what are basically massive coops to sharing ownership in each other's companies to varying degrees so they have vested interest in each other's sucess rather than promoting only hostile take overs (which are prevalent in the US these days)... if anything I'd say current Japan is the exact opposite of most socialist countries they even have problems with people working too hard being coming workaholics and dieing because of it.
    12
  7. It's what happens when you design by committee and bureaucracy instead of just science, research and engineering.
    11
  8. jabroni6199 2 stroke diesels must have a blower aka supercharger....it wouldn't run at all without one. The turbo provides higher intake pressure and recycles waste heat from the exhaust while allowing to unload the less efficient blower.
    11
  9.  @northdakotaham1752  70kw will keep you toasty for a long time... the model Y also has a heat pump so probalby will heat decently for quite a long time.
    7
  10. A small opposed piston multi fuel engine would be 1000% better than this rotary and that is the sad part.
    7
  11. Apparently constant abrupt stats and stops can cause excessive wear on Honda CVTs (pulley style) . I drive mine about 45min to work and back daily and while I feel it's reliable but I dont feel that you should floor it from a stop all the time and expect it to last. I think that is part of the reason Toyota added a launch gear....
    7
  12.  @wowfrosted13  'cept gas powered cars can be carbon neutral also if powered by biofuels and or solar produced methanol etc... EVs have their place and so to ICEs.
    6
  13. probably intentionally lean power stroke to complete combusion... effectively an "EGR" stroke.
    6
  14.  @timothyfeist7364  To be fair... you should be reading the cop's question with Clarkson's voice and Jason's with Hammond's ....
    6
  15.  @py1211  The problem's mentioned in the video with CVTs are very real ... I have a 2017 accord with a CVT, 60k miles on it and its given no problems, but it is not efficient if you put the pedal down, and it is a bit spongy, initial torque is good but it just feels lacking.
    6
  16. Calling a Modern EV simple is wildly inaccurate .... simpler than a hybrid, but vastly more complex than an elegantly designed ICE (achates power's engines for instance)
    5
  17. It's because the NOx produciton peaks at a certain leanness and they are well past that into the area where it has fallen off dramatically. Also, lower temps due to SCCI having a more homogenous burn leads to lower NOx as well.
    4
  18.  @EngineeringExplained  The answer is always Miata...
    4
  19.  @BrunoRaven  That 11:1 ratio has nothing to do with flex fuel though.... for instance my US honda Accord runs 11.5:1 and is NOT a flex fuel vehicle unfortunately.... it also runs just fine on 87 octane. Flex fuel vehicles just have to adjust the AFR to the correct values for the fuel being used... that is all there is to it compression is about the same on a flex car... because it has to be able to run both, on an ethanol only car they can easily go up to 13:1 or so.
    4
  20. Gets it painted white so he's less likely to get a speeding ticket....
    4
  21. Because it was less efficient... way less efficient... I'm really not sure where you got the impression that it was efficient at all. That isn't to say that you can't make an efficient rotary but they didn't.
    3
  22.  @rustynail914  Actually the oil injector is prone to failure (they've had that for 20 years) if it ever fails your engine will die.... its better to just mix it manually that way you know what is in there for sure. On the other hand if someone borrows your boat and runs it without oil it will also fail!
    3
  23.  @Appletank8  Mazda's Skyactive-X required them to do calculations per piston cycle...they actively adjust per combustion cycle on that engine. So this probably builds on that. Older engines just retune gradually over time. But since they were trying to avoid detonation they had to do these calculation in realtime per each cylinder and combustion cycle.
    3
  24.  @Kraigmire  Those new Mazda engines actually have pressure sensors in the pistons that feed into adjusting all the parameters for the next combustion cycle every cycle. So they are going a bit past just knock sensors already as those engines are high enough compression that any significant knock at all would damage them.
    3
  25. Actually I figure the compression ratio is a bit lower than what you have suggested. Reason being is the requirement of a supercharger, which won't do much at low RPMs allowing for easier starting, but also allowing higher pressures at mid to high RPMs, the result being that you can operate in HCCI for a much wider section of the powerband. The problem with GM and others implementation of HCCI was that it only operated for a very small portion of the powerband and definitely not the "zoom zoom" part.... I suspect Mazda has fixed that with HCCI running for everything except during engine warm-up and potentially low RPM where they run the SPCCI mode as you described which frankly is still very good.
    2
  26.  @mglenadel  The grades are a bit different in Brazil though... its basically plain E27, E27 with detergents and E100. They call them Comun, Adiditivada and Alcool. In the USA almost all fuel has detergents, and the difference in grade is octane rating only.
    2
  27. Sounds like a complete non starter... you'd have a lot of people going back to their car to find it never charged since they were deprioritized.
    2
  28. When my bro was like 3 he would beat himself up like a boxer and then fall on the ground.... does that count?
    2
  29. Diesel fuel is not a lubricant.... if it gets on your cylinder walls too much it will wash the oil off an cause excessive wear which is why tuning the injector spray pattern is important.
    2
  30. Then you also have to deal with port wear and carbon buildup.....its not a nice trade off. It really only makes sense if you can eliminate the valve train like achates power does.
    2
  31.  @noah22261  You need at least double the batteries for your microgrid storage idea... which is prohibitive cost wise and materials wise. Also you have even worse power delivery losses that way.... since you have to charge and discharge at least one more battery at significantly less than 100% efficiency.
    2
  32. I'm used to 600mi in my Honda insight... drive from GA and back to NC on one tank. It gets about 62mpg (also there us a plug in hybrid conversion that bumps it up to about 110+ MPGe or higher depending on how heavy you go on the IMA motor). And yeah that does boost the range up over 1000mi... its just sad that 20 year old tech (mixed with modern batteries) is curb stomping all this new stuff. Supposedly there is also going to be a project to upgrade the IMA motor control to a more modern and more efficient control scheme also. Oh and the 110mpge is with 10gal of gasoline + about 100lb of batteries. Anyway going back to "technology that exists today" Why are we still growing corn instead of U of IL's Oilcane which can today produce about 10x the oil per acre as soy + 30 more sugar for ethanol than sugar cane (200% more than corn). Also Brazil is actually trailing Oilcane. If the Honda insight were running on Diesel in a modern engine (instead of it's 20 year old engine) it is quite possible we'd get into the 1500mi-2000mi range easily on 10gal... in fact the Honda Insight already set a record for this
    2
  33. Liquid Piston's engines don't have apex seals.... not all rotaries use triangular rotors. The main thing holding back LP's engines is metalurgy as more forces are on thier rotor.
    2
  34. ThePaulv12 they couldn't meet emitions without a redesign similar to this.... They can almost meet emissions with electronic controls.
    2
  35. Premixed fuel injection yes.
    2
  36. 24k is pretty cheap... and you can get a used on already for 20k no problem.... bear in mind inflation has occurred since the NA was released heh..... a lot of inflation. Actually the sport model price is exactly the same if you take inflation into account.
    1
  37.  @jayyoutube8790  Wrong.... Ford has owned ZERO shares in Mazda since 2015.
    1
  38.  @jaydunbar7538  Nope... Ford has sold all of it's shares in Mazda in 2015 and even then it was already down to 2%. My dad had the same misconception about them... that said the Ecoboost engine was originally designed by Mazda and I would not be surprised if Mazda designed future engines for other companies.
    1
  39. The Fiesta is a Ford... so the reliablity will be anywhere from OKish... to abysmal (check consumer reports). Mazda on the other hand has a nice tight reliability spectrum just a few notches below Lexus and nearly 50% better than average and better than Honda ( I personally own an Acura CL 3.0 with 268K miles on it)
    1
  40.  @sl8slick  It's because they dont' want to store power... if you product extra power it has to go somewhere and that may or may not be possible... so the best thing to do is make the engine as responsive as possible.
    1
  41.  @overtoke  Yes... almost every station has E100 and E27 there is pretty much no E0 since its illegal.... and since it is not anhydrous ethanol in many cases the corrosive properties are less.
    1
  42.  @danafletcher2341  The reason US doesn't have E85 is we only use shitty corn to make ethanol.... its a subsidy crop. A large part of US ethanol could be supplanted by genetically engineered cane ethanol if the politicians would get off thier butts. We have cane now with increased growing range, and that can also produce biodiesel from the same plant (so you get sugar for ethanol + 10x the oil from the cane as soy produces today for biodiesel on the same acre of land).
    1
  43.  @hopsgarage5513  If compression is high enough you don't need to... at 20:1 compression you almost don't need glow plugs and Detroit 2 strokes don't' have them (they get an air charge from a blower + compress that then boom all without plugs and as long as the engine isn't worn out they start up in a jiffy at above freezing temps and you can start them below freezing with some extra turning over as you mentioned). My 3-53 detroit will pretty much fire up on the first revolution.
    1
  44.  @LermaBean  you mean you havent seen any biofuel in the US... it's not like the engines are significantly different it's mostly done in software.
    1
  45.  @type17  Newer? I guess a 2000 Honda insight qualifies as a newer car now?
    1
  46. You mean an engine that inherently lacks balance....
    1
  47.  @raymonddey7403  Mazda hasn't shipped a rotary engine since 2012... and their reliability is in the top 3, and are cheaper to repair than a Honda... but I guess someone's gotta gripe, at least they aren't in cahoots with Ford anymore since many years. Many of their engines are non interference so even if you do have serious problems such as timing chain failure it isn't catastrophic. As far as skyactive-d it's pretty solid and has been on the road for years, Skyactive-X is only being rolled out very cautiously and slowly in certain markets.
    1
  48.  @lzh4950  Trademark.... not copyright. Things like names of cars are tradmarkable but not copyrightable. also numbers like Intel 486 is not trademarkable, which is why you could buy AMD 486..... then Intel changed then name for from 5/686 to Pentium. so they could trademark it.
    1
  49. Running an engine that oil mixed in the fuel (boats, power tool motors etc... ) too lean will cause the engine to be under lubricated and it will get hotter due to friction and seize. The heat is for different reasons that some might expect though... not because the fuel is burning hotter but more energy is going to waste friction and heat. That said such engines are designed to run rich usually, and under lubrication also can coincide with running closer to a stoichiometrically "correct" air fuel mix which also means more energy is available to be wasted...
    1
  50.  @alexzanderroberts995  The problem with liquid piston is there are extreme stresses on the rotor... it does eliminate many of the problems with the wankel rotary but it adds its own. The stresses are extreme enough that it causes materials science problems to build it to be reliable. On the other hand thier use in military drones probably means the stresses and runtime for those engines is not out of reason. They definitely aren't ready for use in most industrial and consumer applications.
    1