I knew pistons werent perfectly round all the way through their height these days, but didnt realise just how different the geometry is, very cool man :) always learning, and knowledge is POWER
You should have mentioned Honda's attempts at trying to make squarish oval pistons work in a desperate attempt to maximize bore area for a given sized block. That went well...
Looks like himself again, back in the days I'd watched him make poly mounts... Super smart dude, I've actually made my own mounts not long after you made your video. Keep on keeping on.
Im an a apperentice engine builder by trade and dude I CANNOT GET ENOUGH OF YOUR CONTENT its super informative and intriguing and watch every video that you put up as soon as you do please keep up the amazing work so i can keep learning and to keep enjoying your videos
I'm sure you've thought about it, but I'd love a video on wrist pin height as well. Also, do any pistons have a pin offset from the center? Towards the major thrust side for example? Great vid as always!
That's a great topic suggestion! Thank you. There's definitely offset pins out there, many new engines have them. It reduces friction, reduces NVH too. I'll definitely cover it in the future.
I simply love learning the details of the basic parts of the engine and how complex they really are! Without you not sure I ever would learn these details.
0:35 is not the taper (a cone shape would have flat sides and not let light through). This effect is because of the "barrel" shape (barreling). This allows the piston to better handle the side loads from the connecting rod. Pistons are pushed sideways into the bore by the connecting rod, and the barrel shape helps with this so the top and bottom edges don't dig in.
A piston is a very complicated object: not only like explained here, but the pin bore from the piston is not cylindrical : it as special forms (double cone like+ oval) , to compensate the flex from the pin and from the piston+ lubrication...and much more hidden secrets...(i had work by Mahle and Kolbenschmitt...)
Very detailed and informative video. Could you please answer the question: why is it that the main bearing axis is symmetrical below the cylinder bore axis. Couldn't you counteract the main thrusts loadings on the pistons through a asymmetrical design or a flat mounted engine?
It also makes it harder to measure the piston to wall clearance accurately especially when the piston manufacturer doesn't provide a gauge point. Sure the piston alloy must also effect these geometries. Another show of the engineering marvel that is the 4 stroke ICE
I feel like Western English even though not the most efficient language, is able to convey the most acute, detailed and understandable level of communication between people trying to explain things to each other.
Thank you for the Piston explanation I always thought it was a little simpler than that but apparently there's a lot of math in it, congratulations on your haircut signs of growing up There's Hope for you yet.....lol
Hi guy. Offset pistons can equalize major and minor thrust, reducing total friction while increasing power, efficiency, and torque. My guess is that they aren't universally used because offset pistons complicate balancing. And adding a thermal break while using the appropriate metal for each sub-part of a piston is far superior to the kluge that is currently standard in obsolete designs. This sort of design also simplifies each part, which makes forged parts practical, greatly improving all aspects of performance without breaking the bank. The above improvements make your engine wayyyy more efficient. They are also some of the several improvements by which a truly modern engine protects its oil from heat and blowby. Oil changes ought to be very, very infrequent. They are needed so often because of contamination and degradation, both of which are glaring indicators of poor design. All in all, a fun little video. Thanks and have a good one. :-)
If your solution weren't far more difficult than the current one, it would already be used. If you believe that to be untrue, start a piston company, and make the automotive world a better place! :)
do you know that the hole for the pin is usually not in the center but slightly offset (we're talking 1mm max) toward the exhaust? i don't remember why tho!
The pin is slightly offset, so when the full force hits the piston at Top Dead Center, the rod isn't standing straight on the crankshaft, but rather starting to go down, thus converting more force into rotary motion, rather than just smacking your crankshaft
Thanks for another great video. I have thought about the things you covered but have a hard time finding good sources of accurate information online. Do you have any books or other sources you would recommend that goes into depth on cylinder and piston geometries as well as the combustion chamber and valve configurations?
Great content and superb video. A lot of engine builder rotate the piston in the bore because of the pin offset, what does this do to the major and minor thrust surfaces? And wear and tear?
It can be done on some engines, but on many engines the mains overlap the bore bottom or there's simply some sort of lip or something in the block. But even when you can remove them from the bottom there's no benefit to it, because you can't install them from the bottom.
How long does it take that the Piston cools down while a brake with shout of engine and how long does it take to get again to perfect expansion when you start the engine again? Does a 15 min break with 1 minute time to warm up again before full load (on the highway for example) means a lot of stress for the piston and the cylinder bore?
You are wrong about the reason for the shape it is narrower across that section because of thermal expansion, it expands more across that area because it has more mass under operating conditions the piston is infact round
Most measure it 90 degrees from the pin at a predetermined height from the bottom of the skirt. The height depends on the piston and manufacturer, but it's usually close to the bottom.
Damn what I've done I've put a piston inside the engine cylinder without a piston ring, to check the bore, cause i dont i have a tools try to rotate it and got stuck all of four cylinder and i think the problem is a bore so i go to the machine 😞 Co'z i thought a piston is rounded
I did too. But not when they got in my eyes, and needed an eternity to dry, and annoyed me in my sleep. This was my second time with long hair, I lasted half a year longer this time 😂
@@d4a pros still outweigh the cons haha. Will stay with your content till your third time.. Looking forward to new episodes of boost school. Keep it up man. :)
I'm a huge fan of your job but today I disagree with some explanations you give. I'm pretty sure that the barrel shape is done due the fluidynamics of the oil in the cylinder wall, in particular to have a meatus of olil and an oleohydraulic lift that keep the skirt apart from the cylinder wall and avoid metal to metal contact
That's pretty much what I said, I just didn't use the words "meatus" and "oleohydraulic". Friction reduction is basically what it's about. By the way, Google "meatus", I'm afraid it's a bit out of place here 😉
@@d4a I traslate italian meato in meatus, I agree with you that's not used in the same way I use it. I'm sorry. btw if you know it's a pity that you don't explain deeply like you have get used us. But don't worry man it's only a whim of mine
Haircut looks good.
Thank you 😊 I ran out of patience with the long version
Did you mean: I like ya cut G
@@natejohnson6269 Uhhmmm. Huh
Alonso accent: much better than before, amazing
Excellent cut my dude.
I got a divine revelation!! My vision of piston will never be the same!!
Once again, I learned. And yes, haircut looks good. ;)
Thanks my man!
I knew pistons werent perfectly round all the way through their height these days, but didnt realise just how different the geometry is, very cool man :) always learning, and knowledge is POWER
The only channel that deserves to share. Thank you so much . Your biggest fan from Saudi Arabia
I FORGOT FOR A SECOND! NICE HAIRCUT BRO YOU LOOK BEAUTIFUL!
I'm a beautiful short haired butterfly 🦋!
You should have mentioned Honda's attempts at trying to make squarish oval pistons work in a desperate attempt to maximize bore area for a given sized block. That went well...
what engine are you talking about ?
@@michalwilk4748 Honda NR Engine. They wanted to make it to pass the regulations.
Looks like himself again, back in the days I'd watched him make poly mounts... Super smart dude, I've actually made my own mounts not long after you made your video. Keep on keeping on.
talks a lot more though ;)
Looking sharp with that hair cut!
Thanks man
Been building engines for years and still learned a few things here. Great video.
I literally could not keep my eyes off the haircut. Looks good man👍🏻 great video as always
Im an a apperentice engine builder by trade and dude I CANNOT GET ENOUGH OF YOUR CONTENT its super informative and intriguing and watch every video that you put up as soon as you do please keep up the amazing work so i can keep learning and to keep enjoying your videos
Thank you for this amazing comment
And also please send me a link to your merch page as I'm struggling to find it and would like to buy a couple of pieces of merch thx
It's always at the bottom of the description 😊
the fact that every time i have an engine question which you answer in a video is astonishing
That made pretty hard to develop Honda`s NR750 oval pistons.
The rings were also a big problem on those.
Why don’t we have dorito shaped pistons 🤔
Because braaaaaaaap
because it will *chip*
Bro, Rotary ?
some people just can't handle real power when they hear it...
We do its called a wankel :)
The man teaching me what i didn't get to learn in tech school
Unstable skirts have their good points
Looks like motorists got caught up in technical stuff 😂.
Pure dry learning material without water. Super! Thank you!
I'm sure you've thought about it, but I'd love a video on wrist pin height as well. Also, do any pistons have a pin offset from the center? Towards the major thrust side for example? Great vid as always!
That's a great topic suggestion! Thank you. There's definitely offset pins out there, many new engines have them. It reduces friction, reduces NVH too. I'll definitely cover it in the future.
@@d4a are waiting
I simply love learning the details of the basic parts of the engine and how complex they really are! Without you not sure I ever would learn these details.
0:35 is not the taper (a cone shape would have flat sides and not let light through). This effect is because of the "barrel" shape (barreling). This allows the piston to better handle the side loads from the connecting rod. Pistons are pushed sideways into the bore by the connecting rod, and the barrel shape helps with this so the top and bottom edges don't dig in.
This was a fun video, on a Sunday morning enjoying breakfast.
A piston is a very complicated object: not only like explained here, but the pin bore from the piston is not cylindrical : it as special forms (double cone like+ oval) , to compensate the flex from the pin and from the piston+ lubrication...and much more hidden secrets...(i had work by Mahle and Kolbenschmitt...)
So how to make perfect piston
Thnx
Never knew this one! Very interesting!
ive learned this at school but never seen it like this good hair style dude
Very detailed and informative video. Could you please answer the question: why is it that the main bearing axis is symmetrical below the cylinder bore axis. Couldn't you counteract the main thrusts loadings on the pistons through a asymmetrical design or a flat mounted engine?
It also makes it harder to measure the piston to wall clearance accurately especially when the piston manufacturer doesn't provide a gauge point. Sure the piston alloy must also effect these geometries. Another show of the engineering marvel that is the 4 stroke ICE
New haircut. Looks great and as allways great video ☺️
Thank you 😊
Huh, never knew that! Thanks for the clear and concise reasoning my dude!
I was expecting a few words on piston pin offset, but it would have gone beyond topic I suppose.
Brilliant as usual :)
I love your content please keep it up!!!!
you are good at what you do!
I feel like Western English even though not the most efficient language, is able to convey the most acute, detailed and understandable level of communication between people trying to explain things to each other.
Thanks for the great explanation
Thank you for the Piston explanation I always thought it was a little simpler than that but apparently there's a lot of math in it, congratulations on your haircut signs of growing up There's Hope for you yet.....lol
You may have convinced him to grow the hair out again! I enjoyed the piston explanation as well - more to it than I knew.
Hi guy. Offset pistons can equalize major and minor thrust, reducing total friction while increasing power, efficiency, and torque. My guess is that they aren't universally used because offset pistons complicate balancing.
And adding a thermal break while using the appropriate metal for each sub-part of a piston is far superior to the kluge that is currently standard in obsolete designs. This sort of design also simplifies each part, which makes forged parts practical, greatly improving all aspects of performance without breaking the bank.
The above improvements make your engine wayyyy more efficient. They are also some of the several improvements by which a truly modern engine protects its oil from heat and blowby. Oil changes ought to be very, very infrequent. They are needed so often because of contamination and degradation, both of which are glaring indicators of poor design.
All in all, a fun little video. Thanks and have a good one. :-)
If your solution weren't far more difficult than the current one, it would already be used. If you believe that to be untrue, start a piston company, and make the automotive world a better place! :)
I’m digging the new hairstyle. Also, another awesome video. Cheers!
do you know that the hole for the pin is usually not in the center but slightly offset (we're talking 1mm max) toward the exhaust? i don't remember why tho!
The pin is slightly offset, so when the full force hits the piston at Top Dead Center, the rod isn't standing straight on the crankshaft, but rather starting to go down, thus converting more force into rotary motion, rather than just smacking your crankshaft
@@MinecraftNickTV Thank you!
@@MinecraftNickTV ...THAT'S an excellent explanation !! I couldn't get my head around before 👍
U look refreshed!!!
Thanks 😊
what an explanation! you just got a subscriber here.
Thanks for another great video. I have thought about the things you covered but have a hard time finding good sources of accurate information online. Do you have any books or other sources you would recommend that goes into depth on cylinder and piston geometries as well as the combustion chamber and valve configurations?
Wow Man, you are looking handsome with that cool haircut
Thanks man!
Awesome haircut!
missed the oval of the crown to correct for the exhaust side thermally expanding more.
Really good stuff man! Dropping a comment to help out the algorithm.
Thank you so much once again bro
thank you great video happy new hair cut
Thank you!
Cool, thank you!!!
Great content and superb video. A lot of engine builder rotate the piston in the bore because of the pin offset, what does this do to the major and minor thrust surfaces? And wear and tear?
Great video. What is this guy’s background? Degree?
So why can't you pull pistons through the bottom of a block
It can be done on some engines, but on many engines the mains overlap the bore bottom or there's simply some sort of lip or something in the block. But even when you can remove them from the bottom there's no benefit to it, because you can't install them from the bottom.
Another great video! Thank you very much!!
Awesome content, thank you! great channel, hope you get more subscribers and supporters!
my dude i like the new hair style haha
Good time to explain piston slap.
Gr8 material mate, thank You!
great stuff
Nice
Very informative and useful video. Thank you very much!
The only place that my pistons stay outside the engine are in bubble wrap or an oil bath
Congrats?
Did'nt go into off set wrist pin locations?
Looking good my man! I like what you did with your hair!
I like ya cut g
The whole explanation isn't valid without a reason for the new haircut 😄👌.
Very cool video. Is there also a video about the zylinder, the bore and the hone coming??
Great video
Thank you, fascinating.
Hair is looking great dude, couldnt stand the maintenance anymore? :P i feel that haha
Definitely, ran out of patience 😅
Nice video and keep it up.
How long does it take that the Piston cools down while a brake with shout of engine and how long does it take to get again to perfect expansion when you start the engine again? Does a 15 min break with 1 minute time to warm up again before full load (on the highway for example) means a lot of stress for the piston and the cylinder bore?
also the pin hole isnt on the y axis. it has a offset
I like ya cut, G!
Let us know this whole debate on turning pistons 180 degrees for more power
What does it meany by skirt? I don't understand what skirt is
Do you have any good engineering source where to calculate piston dimensions like bore, height, taper, ovality, etc.? Would love to get any lead
lol, i can't believe how good it ran with the pistons in backward.
Nice haircut there
You are wrong about the reason for the shape it is narrower across that section because of thermal expansion, it expands more across that area because it has more mass under operating conditions the piston is infact round
do pistons change shape as they get hot?
Is 4 stroke taper and ovality same as 2 stroke engine pistons?
What kind of piston is that @ 5.10?
So is it possible to install a piston the wrong away around?
Yes, but most have markings on top that tell you which way it needs to be directed.
So where does the piston measure its nominal size?
Most measure it 90 degrees from the pin at a predetermined height from the bottom of the skirt. The height depends on the piston and manufacturer, but it's usually close to the bottom.
Hair looks good, but I thought the long hair was cool too!
Damn what I've done I've put a piston inside the engine cylinder without a piston ring, to check the bore, cause i dont i have a tools try to rotate it and got stuck all of four cylinder and i think the problem is a bore so i go to the machine 😞
Co'z i thought a piston is rounded
ohhhh where are the hair bro? haha
Why don't we have oval VALVES?
Hey buddy, I am following you long time. I have a few questions for my car... I will ask on IG
logic is off. The mass is concentrated in the crown, and the diameter at the crown is smaller diameter.
Did it hurt? Getting your hair cut?
You look so different with short hair :)
Did not know that pistons had a side
why the haircut. really admired your golden majestic locks
I did too. But not when they got in my eyes, and needed an eternity to dry, and annoyed me in my sleep. This was my second time with long hair, I lasted half a year longer this time 😂
@@d4a pros still outweigh the cons haha. Will stay with your content till your third time.. Looking forward to new episodes of boost school. Keep it up man. :)
Haircut shock
I'm a huge fan of your job but today I disagree with some explanations you give. I'm pretty sure that the barrel shape is done due the fluidynamics of the oil in the cylinder wall, in particular to have a meatus of olil and an oleohydraulic lift that keep the skirt apart from the cylinder wall and avoid metal to metal contact
That's pretty much what I said, I just didn't use the words "meatus" and "oleohydraulic". Friction reduction is basically what it's about. By the way, Google "meatus", I'm afraid it's a bit out of place here 😉
@@d4a I traslate italian meato in meatus, I agree with you that's not used in the same way I use it. I'm sorry.
btw if you know it's a pity that you don't explain deeply like you have get used us. But don't worry man it's only a whim of mine
Pistons are not round because they don't expand evenly. 'Cam Ground' was the term used in the past, because of this characteristic.
Finally....man bun free!!!
Piston porn.. love it
Oj osisao se
Oj jesam