Thank you Destin! The behind-the-scenes video captured so much of what it was like to spend the day with you. We had a blast making this engine and getting the chance to have you film it.
When I was twelve years old (1970), the family lawn mower would not start. My Dad let me try my hand at rebuilding the Briggs and Stratton. I performed a complete teardown and rebuild. Much to everyone's surprise, especially my own, I was able to repair the engine and it provided many additional years of service. That was a half-century ago! Thanks for bringing back those memories.
Before, engines were just magic to me, but seeing the parts and how they actually go together in a real engine (instead of just looking at pictures) gives me WAY more understanding about how they start and operate. Cool stuff!
Thanks to Everett, Mike, and Bill for hosting me in New Jersey! Their channels are in the video description. Fun anecdote, I thought you might like the Keychain I've had since I was 15: goo.gl/sN7PKJ
Smarter Every Day 2 It's not odd to have a younger generation working with the older, learning from one anouther. It's just not common anymore, because the younger generation of today think they know everything, but really have no clue. The new generation of engeneers I have to deal with today are in my opinion so narrow minded and can only rely on there paper trail, and not any skill or knolage.
Smarter Every Day 2 It's not odd to have a younger generation working with the older, learning from one anouther. It's just not common anymore, because the younger generation of today think they know everything, but really have no clue. The new generation of engeneers I have to deal with today are in my opinion so narrow minded and can only rely on there paper trail, and not any skill or knolage.
Sorry to say it, but this is a surprisingly low quality video (on the analysis part). You do not even ask questions, not mentioning the answers. Why is the flame this color? Why are valves rotating? Why does exhaust valve opens, while the combustion is still ongoing? Why is the engine misfiring all the time? Why does increasing the backpressure improves combustion stability? C'mon Destin, I'm sure u can do better than that. =) P.S. I must say, this is a very bad engine with a really poor combustion process, and the redesign made it even worse. P.P.S. Please, don't call combustion "explosion".
Smarter Every Day 2 Hey Destin, I was kinda caught by that last pressure thing you said, cause i thought the same and I've been thinking about it and maybe it is lower pressure inside and the air outside is actually rushing in instead of the gas rushing out, I am really not sure, but hey, asking is always important. Big fan of yours (want to become a mechanical engineer)
Mr. D I think he did an excellent job of giving the average you tube viewer a general explanation of what's happening inside a IC engine... if you want an in depth analysis there is plenty of that to be found but he would have lost the audience going into that level of detail here... as for the combustion quality ... it's a low compression flat head engine... what did you expect?
Love their friendship. One of my closest friends is 40 years my senior and to have that extra perspective on the world is so valuable to both of us. Super neat
I love to see people that do amazing things not by setting out to do great, but by messing around with a passion until something ground breaking has been achieved.
This is one of the best 34 mins I have watched. I knew how engines worked but the explanation seemed very well done. I hope people find this when wanting to learn how motors work.
Behind the scenes stuff like this is usually even more exciting then the main scene, cause it's a bunch of guys working together trying to figure stuff out, and watching the moment where it "clicks" is just so satisfying!
This is a trip down memory lane for me. As a kid I worked on Briggs & Stratton engines all the time. I knew them really well inside and out. If I remember correctly (usually not) I used a matchbook cover to gauge my spark plugs and paper to gauge the magneto/ flywheel gap. I truly loved working on them. I was told countless times I would never a certain engine running and always did. Their very simple, fuel, spark and compression so if the engine is not running just check each one.
Probably my favorite video I've ever watch on youtube hands down. It brought back so many amazing memories working with my dad in the garage, him trying to explain engines to me, me just trying not to drop his tools. Thank you for the reminder of those amazing times with him Destin and thank you for a fantastic video! Cheers!
I grew up tinkering with small single gas engines that had been discarded from worn out lawn mowers and try to get more power for a cousin's mini-bike. We ground down cylinder heads to increase compression ratios and welded on cam shafts to increase lift. All this work was very very crude and never achieved a motor that would run for more than a couple of seconds, but teenage minds busy. To see want these two fellows have a done is very amazing. Thank you creating this video because I have now seen what knew was happening in the inside the engine cylinder. Great job!!!!!
I know I'm necro posting a video from forever ago, but honestly, I'm not a car guy, never have, never will be. But seeing these things in this manner really really makes sense in a way that math and fluid motions doesn't for me. Thank you so much for taking this trip out there and doing this with these guys. It's amazing because every person you talk to on your channel is so engrossed in the project that they're working on. It just sucks when its "proprietary knowledge" and they can't share it. Great video! I'm Smarter Everyday
Going into this I didn't think I would get through the whole video, but the way it was made where all of my questions were answered and my curiosity was kept up through the entire video made me stay. very well done, what those guys do is amazing
I would love to see more videos like this related to mechanical and aerospace engineering. I am a mechanical engineering graduate and I see everyday how we(engineers) take things for granted which are actually awwwwesome at their core. My respect for all the people who have contributed in the development of beautiful machines around us has tenfolded after watching this video. Thanks Destin!!
This video has been so satisfying to watch. Not only for the physics, but also for seeing these people come together, enjoy it and synergize, learning and improving as they go. Keep it up guys, yo all do great work.
Have been watching 805 roadking for years the same as I have you (chicken Cam)... Those Boys are brilliant and all compliment each others skill set... You are honored to be included as well as they themselves are honored to work with you too.. Brilliant Video. Many Blessings , SMR
It was a wonderful 34 mins of be being in constant awe and jealously over their amazing hobby. Thank you for sharing this behind the scene because i think it was more amazing than the master video imo.
You thank us the viewers for watching 30 mins of behinds the scenes (basically pure knowledge) ??? We should thank you for making this behind the scenes we should thank all of you for making this AMAZING video :P
Mike is 25? Holy cow I am 25 and still sitting in university and doing like nothing with my own hands. I really respect this guy. He get's shit done. Also, thank you for this super interesting video. I think I learned quite a bit from it.
The paper towel filter provided beautiful lighting. I love things like this when people just take what they have and make it into something completely different and better. Awesome video
I have not smiled this long through a UA-cam video as I did watching this. These guys are the best!... No that doesn't do them justice. They are AMAZING. Thank you for sharing this with us Destin!
That gentleman in the maroon shirt and the safety glasses, is such a good explainer. I really like the way that man expresses his vast knowledge of engines, he's super willing to carefully and patiently go over the very basics. Not all experts can do that.
this is basically what im studying in school now, but then a bit bigger, like thousands of times bigger. for big ships at sea and its exactly the same but on a larger scale, and i want to thank you so much for making these videos this has showed me exactly what happends and i love it!
Mike is light years ahead of most 25 year olds. Such a cool friendship. There is something nostalgic about it. Respecting elders...... something we don't do enough of these days.
Though I have seen this in my minds eye for many years, it is incredibly awesome to see it happen visually. And a hand made engine? that's a mindblower!
I don't really know anything about cars or engines or motors or whatever word you want to use, but this video is very satisfying for some reason. Shout out for the Amazon box in the background!
Yes, I did just watch a half an hour of this. Honestly I think I enjoyed this more than the main video, but only because I already knew about four-cycle engines and wanted to see more of these guys' shop. I am blown away by the stuff they've got (they remind me of my grandfather, who did a lot of similar things such as mounting two transmissions in-line or basically inventing the push-out). I am definitely checking them out and forwarding some links. I have family that would salivate over that stuff.
i just watch your other main video then i had a 20 minute conversation with a stranger about how it works. he had 20 years experience in exhaust fabrication. you need to delve into exhaust flows. it really was fascinating. the engineering in pressure difference is amazing.
You know what I like so much about this, for me as well as for Destin it is equal to watch 3 guys in a makeshift garage, or an astronaut explaining the ISS... Science, logic and common sense. Always interesting!
Hey Destin! Love the video! Don't know if somebody else has already addressed this, but the back pressure issue is timing related. Just like you showed in the see-through potato gun, the power stroke explosion is a pulse going both forward and backward, filling the space. Those pulses stack on top of one another, and have harmonics, just like any other fluid waive. By adding the sticker "flap" you provided a physical way for those pulses to be halted. When the piston is ending the exhaust stroke it suffers from too much vacuum - just like a vacuum pump. This is where valve overlap comes in - where the intake and exhaust valves overlap for a brief moment so that the vacuum created by the exhaust starts to draw in fresh intake. With set cam timing, set combustion chamber, set exhaust manifold/muffler, and set intake the only variable left is ignition timing and engine speed. At some point (not sure if the glass head would hold), the engine speed will reach a harmonic frequency, where the exhaust pulses produce a standing wave and gas can move freely. At this point you will no longer need the sticker "flap" and the engine will sing. Variable valve timing, intake lengths (like those found on high performance cars and motorcycles), ignition timing, etc all strive to augment the vacuum principles to try and produce this harmonic at all engine speeds (RPM's). The EGR that he refers to is an emissions control and is only tangentially related to this issue. It's function is to recycle vapor pressure generated in the head through the combustion process instead of venting it to the atmosphere. In this Briggs and Straton side-valve engine, the head is just a cap. In modern engine, the head, in addition to being the top of the combustion chamber is also the host for valves, rockers/pushrods or cams, etc. All of those workings produce vapors that need to go somewhere or it will blow oil out beneath the valve cover, cover your engine and burn up producing unchecked emissions. Since these side valve Briggs and Straton engines vent their "head vapors" into the crank case, being part of the same assembly the EGR system isn't needed. Side valves are cheaper and easier to make, at the cost of performance. Not sure if this made any sense. Super glad you made the video, love your channel, you are an inspiration!
I was making the video, and after you mentioned the timings all I could think of was "but how do they do the timings accurately without a high speed camera. Absolutely love your content!
"Holy cow, you just watched..."? YES, I did! I _love_ BtS stuff, Destin, and thanks for making it! Now I just need to go back and watch the main video.
Really awesome! I like seeing people who are really passionate and love what they do, it's infectious. BTW the clips at 23:17 are jaw dropping. Way to get the shot!
Thank you, Dustin, I think that it's great that you made a second channel to explain, in further detail, what you did in a different video. Also, thanks for sharing Road King's channel, I've always been a big fan of him and Dirt Bike.
I just wanted to take a minute and appreciate you for making this second channel. I am a Mechanical Engineering student and I have studied IC engines, but only now do all the dots connect! Thanks Destin! You're awesome!
Every day while driving I have wondered how engines can explode in such a controlled manner. This is amazing. Also loved seeing the longer explanations in the behind the scenes.
In decades to come engine makers will see this and think 'man that's archaic', but in the same breathe will also say 'it's stunningly beautiful, these guys are masterful artists of their craft'. Maybe. Either way, thank you Destin and all involved, great video and always inspirational, even though I still think the combustion engine is part based on wizardry and alchemy.
More often "Behind scene" are interesting than the main movie - this is why I spent 34 minutes for watching :) Thanks! You talking with them about engines they made encourage me to take a closer about technics what is used by other companies (like Honda, Opel, Volkswagen etc.) :)
Oh my goodness, this was a phenomenal video. I learned a lot of things and was given visual context to reinforce that learning. The passion and enthusiasm each of you share is such a pleasure to witness as well.
This video finally hit home to me. I’ve heard all the terms and thought I understood the physics, but until this video it never hit home. Thank you gentlemen for making me see the light (spark).
I found 805RoadKing's series on this a few months ago and I've been riveted ever since, and these 3 videos that you two uploaded today are the icing on the cake. Absolutely fascinating. Excellent collaboration!
I love the look on the Mike's face at 29:41 when Destin asks him how he welding the 4 engines together. It's almost like he thinks to himself "You know, that's a good question. How DID I get it all together and working?"
Wow. This is awesome. I found these guys just before they went viral (maybe as they were) and so wished they had a high speed camera. This is totally awesome that you got to go work with them and bring this knowledge to the world. Thanks Destin!
Yes, I just watched (and rewatched bits) thirty minutes of behind the scenes footage. With immense pleasure and a broad smile on my face. This made me very, very happy, thank you Destin! :)
Most people who have no clue how their car runs except sticking in a key and turning it or now days pushing a button. They really should watch this. At the very least it gives a basic understanding.... or go to how stuff works . com.... As always, thx again for the extra footage.
It's like you heard my thoughts. Saw their videos of this engine a few weeks ago. Thought it would be so cool to see high speed footage of it! And here you are doing just that! And learning even more in the process! I'm a huge gear head and I love learning and sharing my knowledge with others. And I enjoy seeing other people who love learning and sharing what they know too. That's part of what life's about. Thanks for doing what you do Destin!
Actually i just watched the last two minutes because i wanted to know why the exhausted leaves the chamber before the power stroke finished. (it's very clear in warped perspectives video) The positive pressure makes perfect sense, i almost feel silly for not having thought of it myself. Thank you again Dustin!
Not sure what this says about me, but I enjoyed this video more than the main one. They are both excellent videos, but this one just kinda hit me in a little better spot than the other one.
Destin, we have talked a couple times on snapchat. It needs more back pressure because the air fuel mixture isn't quite right. it could be rich, so the left over exhaust leans the overall mixture up, or it could be lean and any unburnt fuel in the leftover mixture helps it ignite. Both could cause misfiring. Unrestricted exhaust is usually best for more power, but retuneing of the air/fuel is required. Since a briggs is a generator, they are tuned for efficiency, not power, and there are very unique ways they achieve high efficiency numbers.
Regarding advancing ignition timing, the term you're looking for is flame propagation. There's a delay in the ignition of the air fuel mixture and the amount of time it takes the flame to propagate to create the necessary force to drive the piston down on the power stroke.
Hi from Tasmania ,Australia, i have never heard the term "butter zone" but here we use the term "the sweet spot" which is more or less the same thimg. Love your work guys ,grreat colab
i love these guys been following them for a while now so im glad you got the chance to meet them and see what they are about. i just want to say mike seems like the coolest guy! and you need to stop plugging your self so much.
This is very useful for driving old cars. I've always known that I need to advance the timing as I speed up in my 1931 Model A, but I've never understood why exactly it matters.
Oh I apologize for not leaving a comment on the video, This in very interesting and I learned quite a bit. Thank you. I left a thumbs up for all that is worth.
Hi Destin. Did you ask them if they could add a pigment to the fuel? Maybe even an ultraviolet one so you can see it under UV light, without changing the colour of the flame. Also love the fact you added the sound effects to the slow motion footage.
I wonder if the reason the engine runs better with back pressure is because the cylinder volume is too large. This not only makes the compression less, but causes too much oxygen to enter the cylinder. With a little bit of back pressure, the compression is increased slightly (well, very slightly) and there is less oxygen to enter the cylinder causing a faster, more efficient burn. The 4 cylinder is impressive. Especially with the dinky tools (no offense) they have there. Just goes to show, the right tool helps, but nothing beats experience and determination.
Back pressure doesn't help any engine ever. It's been proven in circles of builders that actually understand an engine. Its sound waves instead of back pressure. That ought to give you a head start on your studies.
I enjoyed the original video, but I loved this video for just listening to you guys talk about stuff. I know very little about engines, but this was fascinating! Thanks, Destin!
My name is Charlie I’m 15 I’m from Australia and I love this kind of stuff also the exhaust with the sticker could also be that there is more resistance in the exhaust and therefore less loss of compression with that spaced head
"We made the engine run better by putting a sticker on it" This is beautiful: capturing the awesomeness of science AND its cluelessness at the same time.
I loved this. I was completely engrossed by the entire video. I didn't realize I watch 30 mins. It was so interesting seeing the passion in that room and seeing the pure curiosity of everyone involved. Thank you for sharing this extra content. I've been a long time subscriber and I'm definitely hooked. Thanks Destin!
Destin, cmon, im subscribed for more than six years now. You dont need to remind me ;) its always a pleasure, man! Stay safe and keep getting smarter every day! Cheers
Thank you Destin! The behind-the-scenes video captured so much of what it was like to spend the day with you. We had a blast making this engine and getting the chance to have you film it.
Good Job Bill. Super excellent stuff! Thank You! Chuck in Kansas
When I was twelve years old (1970), the family lawn mower would not start. My Dad let me try my hand at rebuilding the Briggs and Stratton. I performed a complete teardown and rebuild. Much to everyone's surprise, especially my own, I was able to repair the engine and it provided many additional years of service. That was a half-century ago! Thanks for bringing back those memories.
Before, engines were just magic to me, but seeing the parts and how they actually go together in a real engine (instead of just looking at pictures) gives me WAY more understanding about how they start and operate. Cool stuff!
LazerLord10 That's why we need to support channels like these. not the cringy social experiments.
downlink
23:18 That is absolutely amazing.
Love seeing awesome people in the comments! I like that you are part of the whole UA-cam community.
Hmmm where I'm from we call it Jimmy Rig lol
BenBuzzinGrowse
here in Utah we call it Jerry Rigging...
I'm still impressed by Quadsimoto tho.
Very satisfying with all the low slow-mo sounds too :D
Thanks to Everett, Mike, and Bill for hosting me in New Jersey! Their channels are in the video description.
Fun anecdote, I thought you might like the Keychain I've had since I was 15: goo.gl/sN7PKJ
Smarter Every Day 2 It's not odd to have a younger generation working with the older, learning from one anouther. It's just not common anymore, because the younger generation of today think they know everything, but really have no clue.
The new generation of engeneers I have to deal with today are in my opinion so narrow minded and can only rely on there paper trail, and not any skill or knolage.
Smarter Every Day 2 It's not odd to have a younger generation working with the older, learning from one anouther. It's just not common anymore, because the younger generation of today think they know everything, but really have no clue.
The new generation of engeneers I have to deal with today are in my opinion so narrow minded and can only rely on there paper trail, and not any skill or knolage.
Sorry to say it, but this is a surprisingly low quality video (on the analysis part). You do not even ask questions, not mentioning the answers. Why is the flame this color? Why are valves rotating? Why does exhaust valve opens, while the combustion is still ongoing? Why is the engine misfiring all the time? Why does increasing the backpressure improves combustion stability? C'mon Destin, I'm sure u can do better than that. =)
P.S. I must say, this is a very bad engine with a really poor combustion process, and the redesign made it even worse.
P.P.S. Please, don't call combustion "explosion".
Smarter Every Day 2 Hey Destin, I was kinda caught by that last pressure thing you said, cause i thought the same and I've been thinking about it and maybe it is lower pressure inside and the air outside is actually rushing in instead of the gas rushing out, I am really not sure, but hey, asking is always important. Big fan of yours (want to become a mechanical engineer)
Mr. D I think he did an excellent job of giving the average you tube viewer a general explanation of what's happening inside a IC engine... if you want an in depth analysis there is plenty of that to be found but he would have lost the audience going into that level of detail here... as for the combustion quality ... it's a low compression flat head engine... what did you expect?
This is the best 30 min Ive spent on youtube in a very long time! Excellent work.
You did an awesome job piecing this together!! You've proven once again why this is the 2nd best channel on the UA-cam TV!!☺
33:02 Haha, I love how all your faces kinda light up at once.
These are my kind of people/youtubers. I do this stuff in my spare time as well. Thanks Destin for introducing me to them via the internet.
Love their friendship. One of my closest friends is 40 years my senior and to have that extra perspective on the world is so valuable to both of us. Super neat
"Quadsimoto" is a very clever name for that engine. 31:11
I love to see people that do amazing things not by setting out to do great, but by messing around with a passion until something ground breaking has been achieved.
This is one of the best 34 mins I have watched. I knew how engines worked but the explanation seemed very well done. I hope people find this when wanting to learn how motors work.
35 minute behind the scenes video? patreoned. this is so awesome.
Behind the scenes stuff like this is usually even more exciting then the main scene, cause it's a bunch of guys working together trying to figure stuff out, and watching the moment where it "clicks" is just so satisfying!
🖕😁🖕
This is a trip down memory lane for me. As a kid I worked on Briggs & Stratton engines all the time. I knew them really well inside and out. If I remember correctly (usually not) I used a matchbook cover to gauge my spark plugs and paper to gauge the magneto/ flywheel gap. I truly loved working on them. I was told countless times I would never a certain engine running and always did. Their very simple, fuel, spark and compression so if the engine is not running just check each one.
Probably my favorite video I've ever watch on youtube hands down. It brought back so many amazing memories working with my dad in the garage, him trying to explain engines to me, me just trying not to drop his tools. Thank you for the reminder of those amazing times with him Destin and thank you for a fantastic video! Cheers!
its 3 am.... fuck sleep neeed to get smarter
that's early to get smarter this day ;)
Get on my level bro, 6:13 AM and yes I have work to do in the morning (aka. in a while). Probably not worth going to sleep at this point
Pssh... 6:13 AM? Amateur... It's 1:29 AM for me. Lol
sleep well to think well
AM ? PM ?
We got 24hours from 00:00:00 to 23:59:59 Uhr here,
...and if a 24hour day isn't enough we just use the night ... ... :-)
I grew up tinkering with small single gas engines that had been discarded from worn out lawn mowers and try to get more power for a cousin's mini-bike. We ground down cylinder heads to increase compression ratios and welded on cam shafts to increase lift. All this work was very very crude and never achieved a motor that would run for more than a couple of seconds, but teenage minds busy. To see want these two fellows have a done is very amazing. Thank you creating this video because I have now seen what knew was happening in the inside the engine cylinder. Great job!!!!!
another fantastic episode of Smarter Every Day! But the 4 Cylinder engine...and the finish! What a bromance/symbiotic relationship!
Mechanical Engineering major here from Texas! Thanks for making these videos! It was awesome to see these processes in slow-mo
I know I'm necro posting a video from forever ago, but honestly, I'm not a car guy, never have, never will be. But seeing these things in this manner really really makes sense in a way that math and fluid motions doesn't for me. Thank you so much for taking this trip out there and doing this with these guys. It's amazing because every person you talk to on your channel is so engrossed in the project that they're working on. It just sucks when its "proprietary knowledge" and they can't share it. Great video! I'm Smarter Everyday
Going into this I didn't think I would get through the whole video, but the way it was made where all of my questions were answered and my curiosity was kept up through the entire video made me stay. very well done, what those guys do is amazing
Might be my favorite behind the scene so far. Their shop is one amazing place, I almost want to book a flight to the USA to visit it.
I would love to see more videos like this related to mechanical and aerospace engineering.
I am a mechanical engineering graduate and I see everyday how we(engineers) take things for granted which are actually awwwwesome at their core.
My respect for all the people who have contributed in the development of beautiful machines around us has tenfolded after watching this video.
Thanks Destin!!
This video has been so satisfying to watch. Not only for the physics, but also for seeing these people come together, enjoy it and synergize, learning and improving as they go. Keep it up guys, yo all do great work.
Have been watching 805 roadking for years the same as I have you (chicken Cam)... Those Boys are brilliant and all compliment each others skill set... You are honored to be included as well as they themselves are honored to work with you too..
Brilliant Video. Many Blessings , SMR
It was a wonderful 34 mins of be being in constant awe and jealously over their amazing hobby.
Thank you for sharing this behind the scene because i think it was more amazing than the master video imo.
You thank us the viewers for watching 30 mins of behinds the scenes (basically pure knowledge) ???
We should thank you for making this behind the scenes we should thank all of you for making this AMAZING video :P
4 years later, and I think this is the coolest engine video I've ever seen, and it didn't feel like 34 minutes 😂 Great Work!
Mike is 25? Holy cow I am 25 and still sitting in university and doing like nothing with my own hands. I really respect this guy. He get's shit done. Also, thank you for this super interesting video. I think I learned quite a bit from it.
Long form UA-cam videos are my favorite.
The paper towel filter provided beautiful lighting. I love things like this when people just take what they have and make it into something completely different and better. Awesome video
I have not smiled this long through a UA-cam video as I did watching this. These guys are the best!... No that doesn't do them justice. They are AMAZING. Thank you for sharing this with us Destin!
That gentleman in the maroon shirt and the safety glasses, is such a good explainer. I really like the way that man expresses his vast knowledge of engines, he's super willing to carefully and patiently go over the very basics. Not all experts can do that.
03.41 and i'm watching a video on a internal combustion engine with a plastic cylinder head , mind blowing, mesmerizing stuff Destin ,BRILLIANT
this is basically what im studying in school now, but then a bit bigger, like thousands of times bigger. for big ships at sea and its exactly the same but on a larger scale, and i want to thank you so much for making these videos this has showed me exactly what happends and i love it!
Mike is light years ahead of most 25 year olds. Such a cool friendship. There is something nostalgic about it. Respecting elders...... something we don't do enough of these days.
Though I have seen this in my minds eye for many years, it is incredibly awesome to see it happen visually. And a hand made engine? that's a mindblower!
I don't really know anything about cars or engines or motors or whatever word you want to use, but this video is very satisfying for some reason. Shout out for the Amazon box in the background!
I could listen to that hit and miss engine all day. that is some quality ambience right there.
Never stop doing behind the scenes. This is better than the main channel.
Yes, I did just watch a half an hour of this. Honestly I think I enjoyed this more than the main video, but only because I already knew about four-cycle engines and wanted to see more of these guys' shop. I am blown away by the stuff they've got (they remind me of my grandfather, who did a lot of similar things such as mounting two transmissions in-line or basically inventing the push-out). I am definitely checking them out and forwarding some links. I have family that would salivate over that stuff.
i just watch your other main video then i had a 20 minute conversation with a stranger about how it works. he had 20 years experience in exhaust fabrication. you need to delve into exhaust flows. it really was fascinating. the engineering in pressure difference is amazing.
You know what I like so much about this, for me as well as for Destin it is equal to watch 3 guys in a makeshift garage, or an astronaut explaining the ISS... Science, logic and common sense. Always interesting!
Hey Destin! Love the video! Don't know if somebody else has already addressed this, but the back pressure issue is timing related. Just like you showed in the see-through potato gun, the power stroke explosion is a pulse going both forward and backward, filling the space. Those pulses stack on top of one another, and have harmonics, just like any other fluid waive. By adding the sticker "flap" you provided a physical way for those pulses to be halted.
When the piston is ending the exhaust stroke it suffers from too much vacuum - just like a vacuum pump. This is where valve overlap comes in - where the intake and exhaust valves overlap for a brief moment so that the vacuum created by the exhaust starts to draw in fresh intake.
With set cam timing, set combustion chamber, set exhaust manifold/muffler, and set intake the only variable left is ignition timing and engine speed. At some point (not sure if the glass head would hold), the engine speed will reach a harmonic frequency, where the exhaust pulses produce a standing wave and gas can move freely. At this point you will no longer need the sticker "flap" and the engine will sing.
Variable valve timing, intake lengths (like those found on high performance cars and motorcycles), ignition timing, etc all strive to augment the vacuum principles to try and produce this harmonic at all engine speeds (RPM's).
The EGR that he refers to is an emissions control and is only tangentially related to this issue. It's function is to recycle vapor pressure generated in the head through the combustion process instead of venting it to the atmosphere. In this Briggs and Straton side-valve engine, the head is just a cap. In modern engine, the head, in addition to being the top of the combustion chamber is also the host for valves, rockers/pushrods or cams, etc. All of those workings produce vapors that need to go somewhere or it will blow oil out beneath the valve cover, cover your engine and burn up producing unchecked emissions. Since these side valve Briggs and Straton engines vent their "head vapors" into the crank case, being part of the same assembly the EGR system isn't needed. Side valves are cheaper and easier to make, at the cost of performance.
Not sure if this made any sense. Super glad you made the video, love your channel, you are an inspiration!
Hey Destin.
I have so much respect for you, 14.500 people have seen your video, 1000 have liked it and 0 have disliked it!
I was making the video, and after you mentioned the timings all I could think of was "but how do they do the timings accurately without a high speed camera. Absolutely love your content!
"Holy cow, you just watched..."? YES, I did! I _love_ BtS stuff, Destin, and thanks for making it! Now I just need to go back and watch the main video.
It is absolutely amazing to me how the footage around minute 24 looks like some biomechanical heart from a scifi movie.
Really awesome! I like seeing people who are really passionate and love what they do, it's infectious. BTW the clips at 23:17 are jaw dropping. Way to get the shot!
I really, really, really wanted to hear that 4 banger running. For a garage build...that is just gnarly insane.
28:15 I wish you had done slow motion of the spinning governor.
Thank you, Dustin, I think that it's great that you made a second channel to explain, in further detail, what you did in a different video. Also, thanks for sharing Road King's channel, I've always been a big fan of him and Dirt Bike.
Loved this video more than the main channel.
Did not feel like 30mins long. It flew by.
I just wanted to take a minute and appreciate you for making this second channel. I am a Mechanical Engineering student and I have studied IC engines, but only now do all the dots connect! Thanks Destin! You're awesome!
Every day while driving I have wondered how engines can explode in such a controlled manner. This is amazing. Also loved seeing the longer explanations in the behind the scenes.
In decades to come engine makers will see this and think 'man that's archaic', but in the same breathe will also say 'it's stunningly beautiful, these guys are masterful artists of their craft'. Maybe.
Either way, thank you Destin and all involved, great video and always inspirational, even though I still think the combustion engine is part based on wizardry and alchemy.
More often "Behind scene" are interesting than the main movie - this is why I spent 34 minutes for watching :) Thanks! You talking with them about engines they made encourage me to take a closer about technics what is used by other companies (like Honda, Opel, Volkswagen etc.) :)
Oh my goodness, this was a phenomenal video. I learned a lot of things and was given visual context to reinforce that learning. The passion and enthusiasm each of you share is such a pleasure to witness as well.
This video finally hit home to me. I’ve heard all the terms and thought I understood the physics, but until this video it never hit home. Thank you gentlemen for making me see the light (spark).
Man, I wasn't expecting to watch the whole video, but that was great. I love how enthusiastic y'all are.
I found 805RoadKing's series on this a few months ago and I've been riveted ever since, and these 3 videos that you two uploaded today are the icing on the cake. Absolutely fascinating. Excellent collaboration!
I love the look on the Mike's face at 29:41 when Destin asks him how he welding the 4 engines together. It's almost like he thinks to himself "You know, that's a good question. How DID I get it all together and working?"
Wow. This is awesome. I found these guys just before they went viral (maybe as they were) and so wished they had a high speed camera. This is totally awesome that you got to go work with them and bring this knowledge to the world. Thanks Destin!
Yes, I just watched (and rewatched bits) thirty minutes of behind the scenes footage.
With immense pleasure and a broad smile on my face. This made me very, very happy, thank you Destin! :)
Most people who have no clue how their car runs except sticking in a key and turning it or now days pushing a button. They really should watch this. At the very least it gives a basic understanding.... or go to how stuff works . com.... As always, thx again for the extra footage.
holycow, I did just watch 34 minutes of Behind the scenes! SUBSCRIBED!
It's like you heard my thoughts. Saw their videos of this engine a few weeks ago. Thought it would be so cool to see high speed footage of it! And here you are doing just that! And learning even more in the process! I'm a huge gear head and I love learning and sharing my knowledge with others. And I enjoy seeing other people who love learning and sharing what they know too. That's part of what life's about. Thanks for doing what you do Destin!
Actually i just watched the last two minutes because i wanted to know why the exhausted leaves the chamber before the power stroke finished. (it's very clear in warped perspectives video)
The positive pressure makes perfect sense, i almost feel silly for not having thought of it myself. Thank you again Dustin!
I knew the basic strokes of an engine already but now i understead it so much better!
I really like this video. It's cool to see the thought process behind it all and how the crew works together.
Loved the extra footage
Not sure what this says about me, but I enjoyed this video more than the main one. They are both excellent videos, but this one just kinda hit me in a little better spot than the other one.
Destin, we have talked a couple times on snapchat. It needs more back pressure because the air fuel mixture isn't quite right. it could be rich, so the left over exhaust leans the overall mixture up, or it could be lean and any unburnt fuel in the leftover mixture helps it ignite. Both could cause misfiring. Unrestricted exhaust is usually best for more power, but retuneing of the air/fuel is required. Since a briggs is a generator, they are tuned for efficiency, not power, and there are very unique ways they achieve high efficiency numbers.
So glad you put this up. Those guys are brilliant and make magic out of metal. Your video really showed some great info on their projects. Thank you.
I like the behind the scenes version even more!
-Thank you and all of them for making me smarter today.
34 minutes well spent! Wish my engineering classes had been this interesting and informative.
Most beautiful thing I've seen all week.
Regarding advancing ignition timing, the term you're looking for is flame propagation. There's a delay in the ignition of the air fuel mixture and the amount of time it takes the flame to propagate to create the necessary force to drive the piston down on the power stroke.
Hi from Tasmania ,Australia, i have never heard the term "butter zone" but here we use the term "the sweet spot" which is more or less the same thimg. Love your work guys ,grreat colab
Lovely!!!Y'all very nice and awsome people and a 30mins video never felt shorter
i love these guys been following them for a while now so im glad you got the chance to meet them and see what they are about. i just want to say mike seems like the coolest guy! and you need to stop plugging your self so much.
This is very useful for driving old cars. I've always known that I need to advance the timing as I speed up in my 1931 Model A, but I've never understood why exactly it matters.
Oh I apologize for not leaving a comment on the video, This in very interesting and I learned quite a bit. Thank you. I left a thumbs up for all that is worth.
Hi Destin. Did you ask them if they could add a pigment to the fuel? Maybe even an ultraviolet one so you can see it under UV light, without changing the colour of the flame. Also love the fact you added the sound effects to the slow motion footage.
I wonder if the reason the engine runs better with back pressure is because the cylinder volume is too large. This not only makes the compression less, but causes too much oxygen to enter the cylinder. With a little bit of back pressure, the compression is increased slightly (well, very slightly) and there is less oxygen to enter the cylinder causing a faster, more efficient burn.
The 4 cylinder is impressive. Especially with the dinky tools (no offense) they have there. Just goes to show, the right tool helps, but nothing beats experience and determination.
Back pressure doesn't help any engine ever. It's been proven in circles of builders that actually understand an engine. Its sound waves instead of back pressure. That ought to give you a head start on your studies.
+Smarter Every Day 2
Your videos? I would watch hours of them! No problem! Entertainment all way through
That Quadzimodo thingy is just.. whoa!
I enjoyed the original video, but I loved this video for just listening to you guys talk about stuff. I know very little about engines, but this was fascinating! Thanks, Destin!
Better than the "main" video! I love behind the scenes!
This video has way more information than the main video. Amazing job destin!
My name is Charlie I’m 15 I’m from Australia and I love this kind of stuff also the exhaust with the sticker could also be that there is more resistance in the exhaust and therefore less loss of compression with that spaced head
"We made the engine run better by putting a sticker on it"
This is beautiful: capturing the awesomeness of science AND its cluelessness at the same time.
Antonio Lewis: it might have been more appropriate if it was a +.5HP sticker
35 minutes of absolute enjoyment
I loved this. I was completely engrossed by the entire video. I didn't realize I watch 30 mins. It was so interesting seeing the passion in that room and seeing the pure curiosity of everyone involved. Thank you for sharing this extra content. I've been a long time subscriber and I'm definitely hooked. Thanks Destin!
These guys are amazing! Their knowledge of these engines is incredible.
15:23 Something so little makes such a big difference. I'm studying to be an engineer, and I am blown away!
This is the first of only a couple times out of hundreds of Destin's videos that I do not feel like a complete id10t
Destin, cmon, im subscribed for more than six years now. You dont need to remind me ;) its always a pleasure, man! Stay safe and keep getting smarter every day!
Cheers