You're a really good teacher. I came to this video wondering: "What does CC's mean in a motorcycle engine?", yet I left here knowing everything about how the cylinders work for every vehicle and how to calculate it. I know nothing about you or your profession but I would guess that you teach professionally. Cheers for all the information and your efforts.
Wow Filipe, this is one of the best comments I've received! Thank you very much, it means a lot! But no, I'm not a teacher. As a matter of fact, I was a student up until last year. That's where I recorded most of my videos. Although I am a father, so I guess I am a teacher of sorts. Anyway, thank you for such a nice comment and thanks for taking the time to write it.
Thank you so much, liked and subscribed! I will be rewatching this with my 15 year old son. This video is the very best I've ever seen this explained, you took the time to assume nothing of the viewer and carefully explained every term, measurement where they come from and how it's all put together. A+++ video! Shared also with my wife who teaches math in middle school, I'm sure she'll find this useful to highlight a real world application of the geometry she teaches. It's so much better when the math concepts aren't left to abstract rote memorization of formulas for seemingly no real purpose to the learner, rather the student can see that these concepts are in fact real in the "real world".
Wow...!!! Thank you so very much for your kind words and for taking the time to write in. It feels very satisfying to receive comments like yours. And the fact that you'd share it with a teacher is only icing on the cake! I think teachers are underrated superheroes (and heroines). I'd be honored if my video was used as a teaching aid. Again, thank you for your words and welcome to Plane Simple.
@@planesimple8514 No Sir. For real thank you. I forgot to subscribe and you just reminded me. I don't know much about how a engine works from start to finish. And I've started researching it. And I found your vids. You are talented In more ways than 1. You know how to explain. Very complicated things and make a child understand. Thanks for your work.
Wow! Man, this is got to be one of the best comments ever on RU-vid, certainly on this channel! Thank you very much man, I really appreciate it. That is the thing that inspired me to start my channel, to explain concepts that seen hard in a way that makes it easier to understand them. I do try to keep my explanations like the name of the channel, "Plane Simple". Again, thank you for taking the time to give me some positive feedback... and for subscribing too!
@@planesimple8514 not a problem. I make music videos I know it's hard work. And when I saw how you explained it I hadda sub. You are great at what you Do. And people are taken advantage of because they aren't aware of how a engine even operates. You are teaching people and that deserves to be praised. Thank you so much.. great work sir.
OH WOW...!!! Beavertom!!! This comment would have to go right along there too! Your comment has to be one of the best in all of RU-vid!! I am honored that you said that. Thank you so very much! I really appreciate it! Welcome to Plane Simple.
@@planesimple8514 I mean it! You did such a fantastic job explaining this topic. To me videos like this is RU-vid at it's best accessible information for people wanting to learn. Glad to be a new subscriber.
Thank you very much Pete R, I really appreciate it. BTW, you made me laugh by pointing out my dirty hands. 😂 Thanks for taking the time to leave a nice comment.
Perfectly explained and even though animations and diagrams give a good visual representation in videos your demonstration with the actual engine makes it absolutely clear with what’s going on inside - good job. I feel a bit overly critical in saying this but maybe the suggestion that the crankshaft is moving the piston via the connecting rod should be described as the piston turning the crankshaft through the rod. Without the context of combustion in the cylinder causing the piston movement somebody new to this may be left wondering why the crankshaft needs to move that piston. Nonetheless, the video is still explaining displacement accurately as the title promises. 👍
Hello ace of spades, thank you very much for such a positive comment. It is very satisfying to receive words like yours from my very simple, no budget videos. Regarding your comment or suggestion about the crankshaft moving the piston, don't feel "overly critical". I'm always open and receptive to corrections, suggestions or criticism as long as it is done in a respectful way. We can always use another point of view or prospective. Going back to the crankshaft/piston, who moves who? The answer is both. The piston only moves the crankshaft during the power stroke. During intake, the crankshaft is pulling the piston down. During compression the crankshaft pushes the piston up, and during the exhaust stroke the piston is once again pushed on by the crankshaft. It is only during the power stroke that the piston does the pushing onto the crankshaft.
Thanks so much, been trying to understand it w/o school since I don't have the $$$. That said, 4:35 gave me a heart attack lol. Thought the little ones were having a late night fight in the next room from me
Lol... Sorry for the hart attack! (My kids being kids in the background... 😄). You are welcome. And I'm glad my little video helped. Thank you for taking the time to give the positive feedback.
Wow! Thank you very much Airmax90_king. I really appreciate it. It means a lot to have my simple video be rated as "the best". Thank you and thank you for taking the time to write a positive comment.
This was pretty good. Am a driver but am being bashed often for not knowing about mechanics. This really taught me how displacement works. Frankly i only knew dat a 4 litre engine is faster than a 3 litte one 😂
That is correct! You got it! It's not so hard once you understand what those units mean, right? It's nothing more than a unit of volume. That tells you how much volume an engine has available to burn air/fuel mixture.
This was a great explanation my friend. You have now made it really clear to me what displacement means. I create online learning for a living, and you did a fantastic job of teaching me.
Wow Ashwin Rawal, thank you very much for such a positive comment! It means a lot that a teacher has learned something from me! I really appreciate it and thank you for taking the time to give me positive feedback.
Thank you very much Okiedokiee. I'm glad you liked my video and thanks for taking the time to give me some positive feedback. That means a lot. Thanks.
Does the depth of the piston (the space it takes up) affect the area formula or are we just going off the space of the cavity of the cylinder between the beginning and ending revolutions of the piston? Does the depth of a piston affect the torque output? I've seen some engines where the pistons will sit flush with the head surface during their revolution and some where there is some space (volume left), what effect does this have? Does the volume/depth of the head deck play a role in displacing combustion? Sorry for all the questions but you got me curious. Thanks for the information.
Hello "Hugh Jass" that's an awesome name! 😆 The calculation of displacement assumes the top of the piston to be a flat disc. It does not take into account the shape of the top of the piston, a.k.a. the piston crown. There are all kinds of shapes and reasons for the different shapes of piston crowns. You can have indentations into the piston to allow for valve clearance. This avoids piston to valve interference at the to of the piston travel with valves that are still partially open. This is a common characteristic of high compression engines. These engines leave very little space between the top dead center position of the piston and the head and therefore you need to shape the piston accordingly. By the way that little "space" I just spoke about is called clearance volume. It's the space within the head and the piston at top dead center or TDC. The difference in volume between that space and the total volume an bottom dead center or BDC gives you the compression ratio. Here's an entry by an engineer from Quora: components of cylinder volume are important: (a) The "Displacement volume" is the volume displaced by the piston as it moves between top dead center (TDC) and bottom dead center (BDC). This volume determines the capacity of the engine. (b) The "Clearance volume" of the engine is the volume between the cylinder head and the piston when the piston is at TDC. The ratio of this volume to the swept volume determines the compression ratio of the engine. I hope this helps Hugh Jass, and welcome to Plane Simple.
Thanks. Just wondering in a single cylinder 2.5leter engine, the piston is at the bottom of the stroke , does it mean if you put a liquid like oil in it , it could contain 2.5 ltrs of oil
Yes it would, plus a little more. Keep in mind that the very top of the combustion chamber has a little space beyond the top of the piston at top dead center(TDC). That space is in the head and is where the valves and spark plug are. That means that if you were to completely fill the combustion chamber up with a liquid, you would need a volume equal to the piston's displacement plus the extra space in the head.
Yes, it is certainly possible, but you'd be trading some engine characteristics for some others. The longer the stroke, the less efficient the engine tends to be since more energy goes into the direction change of the connecting rod. It also tends to have a lower rev limit before it shakes excessively. But on the other hand, you get more torque out of longer stroke engines. Those are only a coupe of factors that go into the dimensions of any engine.
Hello MG, short answer... I have no idea, sorry. I haven't owned either one, nor done any research about them. I have no information to share about either choice.
Hello Rodney, Not really. Horse power is a measure of the engines ability to extract energy from fuel and convert it to mechanical energy or motion. Although bigger displacement would mean ability to burn more fuel, it does not necessarily corelate to power output. RPM's play a huge roll too. Combustion efficiency, gas path flow characteristics, compression ratio, etc, all play a part in power output of an engine, not just the displacement.
Could you explain how stroke/travel affects power? Correct me if wrong.but a 600cc sports bike can rev higher than 1000cc generally because they have such short stroke. Of course this higher rev should be higher power potential but a 1000cc sports bike has alot more power at lower rpm. Is that part because stroke (part of capacity itself) is larger so more.fuel and air is ignited which offsets the lower rim? Ps thanks for the video
Hello, thank you for your question. No. Let's assume that by "same moving conditions" we are talking about the same vehicle, at a constant speed, or same acceleration, only difference is the engines, one being twice the displacement of the other. In those conditions, the fuel consumption would be about the same for both engines. This is because the engines will only produce the energy required to match and counteract friction and maintain a constant speed, or enough energy to produce a certain acceleration. The engines have the ability to produce a maximum rated power, but they are not always at max power (full throttle). The engine that is twice as big,at full throttle, would be able to accelerate that car faster than the same car would with the smaller engine. In that case the fuel consumption would be around twice as much because you are producing twice the energy but also different accelerations, not "same moving conditions".(I'm using power and energy interchangeably here.) But if you are comparing same constant speeds, or same accelerations, both engines would consume about the same fuel. Think of it this way... It takes a certain amount of energy to move a mass at a given speed against friction, or to accelerate it at a certain rate. This energy comes from the fuel. The engine converts that energy from the fuel into that motion. It doesn't matter how big the engine is, it will only process that fuel at whatever rate you ask of it. A bigger engine can process more of that fuel, therefore it can accelerate the mass faster, but if you throttle back to a fraction of the engine's ability, say to match the acceleration of the smaller engine, then the fuel consumption of the bigger engine would match that of the smaller engine since their output would be the same, only the energy required to produce the wanted acceleration. I know this has been a long answer but I hope that it makes sense. And I hope that I have answered your question.
Hello Scott Free. It depends on the application of the engine, the fuel being used(how fast it burns), etc. For example, Formula one engines tend to be wide piston/short stroke, plus long connecting rods to minimize changes in the angular momentum of the connecting rods. This allows those engines to rev up to astronomical numbers(upwards of 20K rpm's) and produce a lot of power from a small displacement. The down side is highly stressed components and shorter engine life of just a few races. In contrast, large truck diesel engines tend to have the smaller piston diameter with a longer stroke, all relatively speaking of course. This makes for very low revving engines(about 3,500 rpm's) but gives them the ability to produce large torque numbers and a very long engine life(in millions of miles). Regular car engines tend to have "square" engines, with same piston diameter as the stroke (or very close to the same). This makes for a good all-around engine. It revs up to 6K to 10K rpm's and have an acceptable engine life of hundreds of thousands of miles. I hope this answered your question.
It's the same thing, just more of everything...LOL. You could literally attach more of the same engine back to back and make yourself a multi-cylinder engine. Now picture all the. Individual crankshafts joining with each other at the tips, and all the individual blocks fusing together, you'd end up with a multi-cylinder inline engine.
@@planesimple8514 Yeah I understand now.. Just a constructive criticism, it might be better not to assume all viewers understand that a 2.5 Liter 4 cylinder is 2.5 divided by 4.. I felt that it should be included in the topic..
Hello Chrisvill, there's more than just displacement when it comes to horse power ratings, for example, compression ratio and RPM limits. A Lycoming O-320 aircraft engine has a displacement of 320 cubic inches(roughly 5.2L) and it's rated to only 150 to 160 horse power. This is because it is a very low compression engine that spins very slowly at low RPMs. On top of that, the seat of your pants feel of H.P. in your trucks are also affected by the transmissions and rear ends that are coupled to them. Those gear ratios make a world of difference in the performance of the truck. Those gears are a compromise tailored to a specific use, like top speed, towing capacity, acceleration, milage, etc. But transmissions and gears are a tangent that were not what you asked about. I hope you can see now that, like I said in the beginning, there's more than just displacement when it comes to H.P.
Hello Kahlaa Rabbani, it's easy. 1 linear inch = 2.54 cm 1 square inch (in²) = 6.45 cm² (2.54cm x 2.54cm = 6.45 cm²) 1 in³ = 16.38 cm³ or cc (2.54cm x 2.54cm x 2.54cm = 16.38 cm³ or cubic centimeters or cc.) Therefore, to convert cubic inches to cubic centimeters multiply cubic inches times 16.38 I hope this is clear enough.
@@planesimple8514 thanks though, because i was a little bit confused on what measurement people would use for their displacements. for example if you measure you cylinders in inch you get cubic inch, if you measure in cm you get cc. like the mustang boss 429 has a 429 cubic inch displacement but i didn't know how they convert it to 7 liters. turns out they multiply it by 16.38 and divide by 1000 to convert to liters.
Hello MICHAEL LEE, that's not a problem. Forget about the math. As long as you understand the concept of what engine displacement is, then you don't need to do any math, the size of the engine is displayed somewhere on the engine, car, or motorcycle, or whatever else. I just wanted to illustrate where engine displacement comes from. Thank you for watching my video and for taking the time to leave me a comment.
