Hearted Youtube comments on driving 4 answers (@d4a) channel.

  1. As a Mechanical Engineer, I cannot believe you just explained the conceptual difference between Torque and HorsePower better than EVERY SINGLE professor I've ever had!
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  2. What if I stalk myself and post novel length comments here?? 😂😂
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  3. i am a university professor in mechanical engineering and I have never seen a more practical way of explaining the difference between 4 stroke and 2 stroke than this video without sacrificing the crucial details. Many thanks! I will also share that with my students.
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  4. This man just makes me want weird engines in my cars.
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  5. Okay, you weren't kidding, this is actually a really good explanation. You really didn't mess around with any other fluff, you got to the point and explained it with brilliant visual demonstrations. Well done.
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  6. In the late nineties, when they said, "Oh the web means all information will be free," this is the kind of thing I wanted it to be. "Here's all the these explained". Excellent work, sir.
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  7. I agree.. but I have to mention, I am one of those people you mentioned who has spent almost 22 years designing a vane powerplant.. There is well over 70 iterations on my design table and shelves. Most of them run, but the one problem that I run into and many others must cross, is the pressure relief on the back sides of each vane. If it is only air behind the vanes, that is okay, and helps keep the vanes outwards in addition to the rotational forces that naturally fling the vanes outwards. But, once you start to collect any liquids, behind the vanes, that is where me and so many others run into crashes, or failure of the machine. We have tried to vent this trapping system to both the intake side to suck any liquids out of on the exhaust side to be pushed out from the linear motion of the vanes telescopic travel in a pumping action... Even tried to just vent these trapping areas to external areas, for collection just to try to get past the issue... I have tried through holes vents long wise in the vanes themselves to allow the trapped liquids to relieve into the front side of the vanes for additional lubrication on the walls, and likewise on the aft side of the vanes in efforts to lubricate the next following vane.... In either of those, we get hovering of the vanes at higher rpms as the edge is trying to either collect/scrape/scoop up the previously laid oil/fuel and grit and results in HP and rpm loss, and after extended periods of endurance runs, hammering effect of the walls, does what we call "catipillar walling" of harmonic wearing in a sign wave and that creates a nasty problem that compounds on itself to destruction very quickly.... These units are so much fun, but I am personally burnt out.. the math mathematics that goes into the volume of the wedges to intake/exhaust to the dimensions of the vanes length, width, height and or length to thickness issue. Based on over 200 material iterations in some base models, and discover some work great some not, but it just keeps the battle of wear factor to life expectancy of the vanes and housing wall(s).. the saving grace is the ease of machining, as compared to the exceptionally tight tolerance of the Wankle housing to rotor dimensions to aid in prevention wedging or crashing.. these vane motors are pretty forgiving in manufacturing... Allot of work, (as you stated) is still needed by somebody who has more money then me.. I am just a guy in a machine shop playing part time on these, in fact, I haven't touched them in about a year or so... I am not saying anything you said is wrong, but more over, agreeing with you, there is allot of potential for these designs, but somebody who has more money then me can play with more specialized materials / alloys, and simulation software better then mine to hone every bit of active and passive friction out of the entire rotational cycle while incorporating balance as a whole.. Oh, and another crazy issue, leeching, from a combusted chamber, leeching under the wiping edge to the yet not combusted air/fuel ... With a mass damper damage happens in the idea to just carry the rotation on over past the preignition leeched chamber with bent vanes, or snapped axle shaft or ruptured wall.. that is always a fun day and loud too... With out a flywheel aid to dampen things out harmonically, the motors rattle themselves into shavings and scrape themselves to death. Smaller power tools vane pumps are stable, but the moment they step up to combustion, a whole other character of issues happens... Which is what the one photo of the multi-vane rotor was trying to deal with I think it was a (20 vane rotor) also trying even number of vanes and odd number of vanes all trying to calm down the harmonics or vibrations that rattle these into destruction... I wish more people could put more effort and money into this, venture.. The biggest unit I have that is still working is 5 inches, and offer (0.2 HP) @15,000 rpm .and is on a bicycle and geared super low and allot of backfiring from unspent fuel but does work just not very good but is on the threshold of not ripping itself apart.. Maybe this winter, I can get back on these
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  8. I think that the REAL solution is not to eliminate reciprocation, but eliminate rotation. Instead of wheels, we should have large legs that hammer the car down the road.
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  9. I can't believe he actually made a graph of the stututu sound. This guy is a legend!
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  10. I'm a mechanic and I must say I wish things were explained to me this way when I started working on cars. This video is highly educational and made very easy to understand. What you are doing my friend is nothing less than educating people with ease and it just puts a smile on my face.
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  11. A belt will last the whole engine life. The engine life simply ends, when the belt fails 😜
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  12. It’s pronounced Volkswagen Beetle.
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  13. We driving 5 answers today
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  14. 4 years of automotive engineering and never seen someone explain this subject so well
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  15. It was over 30 years ago that my physics professor used the formula for friction to tell me I was wrong in believing that wider tires provide more grip. I knew I was right but I couldn’t prove it to him. I very much appreciate the answer, even if it’s 30 years late. Ha. Thank you!
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  16. Polymer scientist here: All polymers have in common, that chemical, mechanical and thermal loading/aging are not independent but reinforce each other, leading to drastically accelerated aging/failure. It is not completely impossible to develop a wet timing belt, but: The materials used would be drastically more expensive and development and accurate lifetime predictions would be extremely complicated.
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  17. Using elliptical gears to cancel the speed variations from the levers is such an elegant solution
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  18. Dude. Thats probably one of the coolest things I've ever seen.
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  19. This was a great attempt ! And yes its easy to underestimate how hard it is to seal an engine like this!
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  20. Future attempt note: your ignition system has a few issues. First, your gap between the magnets on the flywheel and the magneto is WAY too big. Spec is typically .010” for something like a lawnmower magneto setup. Second, you have a six vein rotor and a flywheel with two magnet sets. You need a flywheel with six magnet sets or you will only get ignition every third vein chamber. Third, you will need to time the flywheel and magnets for proper spark timing. Fantastic first attempt though. More please!
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  21. That has to be the best engineering chain-of-reasoning explanation I have ever heard, in 40+ years as an Engineer myself. You are to be congratulated on your clarity of understanding and ability to get the message across. Superb!
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  22. When A Rotary engine and a "normal" Engine love each other alot, the do a special dance and the make this:
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  23. I can't believe am getting this education for free, it's almost illegal.
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  24. I have been an engineer all my life, (I'm now 57) I have to say that you explanation of what is essentially dynamic geometry, is the most straightforward and understandable that I have seen. Great video, thanks for helping others understand this fascinating field of engineering.
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  25. I'm not a motorhead by any stretch of imagination, so why the hell am I subscribed to this channel??? Ah, wait, it's the no nonsense aproach, no sensationalism, and a goddamn good narrator that through his means of enthusiastic naration inspires curiosity in an average guy like me. Thank you and keep it up!
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  26. The way you explained the difference between torque and horsepower, was a moment of enlightenment
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  27. Hey man, just wanted to say thanks for the way you do videos. No yelling, no gimmicks, no filler. That is really appreciated. Peace.
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  28. I am an 82 years old American who rode 2 stroke trail bikes in the Rocky Mountains of Montana and Wyoming. I never really understood how the shape of the exaust pipe worked. It has been many years since I stopped riding bikes. Today's video, as all of your videos, was very informative and entertaining. Thank you.
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  29. An intelligent and thoughtful man respectfully and succinctly peer-reviewing another intelligent man's work, all while acknowledging the FortNine channel's brilliance and success. This is A+ content.
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  30. "we've had one, yes, but what about second TDC?"
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  31. the man literally got his shirt wet as hell trying to explain throttle position, i tip my hat to u sir, ur commitment to educating others has no limit
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  32. Wow! This isn't some scam, they actually made a geared CVT! Also, your explanation was so thoughtful and precise. Explaining how these mechanisms work is often tricky, but you nailed it.
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  33. Everyone knows that if you pop up the headlights just after you loose it, it will restore the weight balance and you can regain control......that's why the best RWD cars have pop up headlights.
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  34. Incredible video! I already knew this and got extremely fascinated when I first found out, but this video explains the whole point of uneven firing very very well. Everybody must get it after watching.
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  35. One of the most useful tuning videos on the internet today. I'm midway through modern EFIing a 70s car, and I'm glad to see my decision validated here. Wideband, and e-throttle should massively improve emissions and driveability.
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  36. Driving 4 Answers manages to make videos on engine topics I've never heard of with pretty regular frequency. That's so rare on YouTube and I love it.
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  37. Yet another tremendous explanation of engine science.
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  38. Very well said! What's most impressive about your videos is I don't think you're even referencing a script for most sections. You do a brilliant job outlining the subject matter clearly and concisely but unlike so many creators, you obviously know your stuff inside and out. It's that undeniable passion that makes you such a great educator. I always learn something I didn't expect from your content. Creators like yourself are becoming more and more of a rare breed and I genuinely respect your efforts. Keep killing it man.
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  39. CAN WE PLEASE all take a minute to acknowledge how GENIUSLY he explained what a cam does ... both graphically, and, by explaining that it's a physical (metallic) punchcard basically. It's basically software embedded in the hardware. And I'll bet it wasn't quick for him to make those graphics that we experienced for all of 10 seconds ... and probably took him a few hours!
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  40. Finally found a channel that's hard technical while being casual.
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  41. Personally, I appreciate the effort you put into explaining things and enjoy your videos.
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  42. There is no joy greater than finding a forum that looks like it hasnt been updated since 2008 with threads that had activity until a few hours ago
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  43. As a trainer/lecturer I must congratulate you on the clarity of your explanations and the use of visuals to illustrate the concepts
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  44. I first rode a motorbike at the age of 65. I passed my test at that age and my first bike was a Triumph Rocket 3. You’re never too old to do anything. It’s all in the mind!
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  45. A 26 min video with no BS and on point. Respect sir.
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  46. My favorite part was when the tripod snap oversteered.
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  47. Some times people need to relax their expectation of every idea needing to become a commercial success to be considered anything but a failure or scam. Whether it becomes a relavant piece of technology going forward we should all just enjoy this process or seeing and working through this engineering challenges
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  48. It takes a very smart person to explain complex subjects in a simple way for non-familiarized people to understand easily. Thanks once again for such an educative video. I enjoy absolutely each and every one of them !
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  49. This guy should teach teachers how to teach. His voice, his cadence, his scripting. Awesome. love this channel.
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  50. As part of an engineering team of a medium sized company, even our first prototypes usually end up being paper weights. As long as you learned something, the prototype served its purpose. Dont give up!
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