Finding Your Engines Happy Happy Fun Zone 

You explain the process in a generally good laymen way I applaud it, but lacks the real science as to what's going on. Other Physisits/scientist/Engineers will know what I mean.

When someone can explain something in simple to understand terms it shows they have a great understanding of how it works. Great job Tony keep up the videos

Never had the power stroke explained to me like that! Im enjoying this style of video👍🏼

This is some really deep thinkin'. This kind of thing had never entered my mind before. It just goes to show that you really don't know how much you really don't know. Thanks Tony, you've opened my head just a little bit more, once again.

I've been a mechanic for 38 yrs and I always learn something from your videos Tony ! I've been admiring your work since C.I. !! Would love to stop by and say hello next time I'm in TN !! Keep up the great work and Keep Wrenchin !!

I’ve have always been amazed how it’s possible for a internal combustion engine to be so reliable. How tight tolerances are. How things manage not to break. How it stays cool and lubricated. Still pretty incredible

These videos are fantastic. I’m very curious to know how bore and stroke effect burn duration as well as how they effect mileage.

I always feel like an elementary student that cut class, and snuck into a college master class lecture when I pull up to your videos UT. Thank you for the education. 🏁🚬🏁🚬🏁

Tony, I never was into souping up my cars like a lot of friends . Listening to you talk about the mechanical engineering of the engine just amazed me. Now I can understand why hot ridding was popular back then. Those Junk Yard Jet boys sure have a-lot to learn and are very fortunate to have you show and teach them, along with all the kind folks who donated parts. You have all my respect.

Hopefully this opens people's eyes to what a good mechanic and tuner has to take into consideration for a successful engine. It's way more than just throwing a bunch of parts together with nuts and bolts and making it go. Careful planning, understanding how parts work together, and how to set them up, is what makes for a happy long living motor. Doesn't matter if it's a 5 hp Briggs engine, or a 3000 hp drag engine, it's all about knowing what works......and learning from your mistakes when it doesn't.

Great video Tony, I learned a lot. It's amazing how you can break things down in a way that's easy to grasp. Thanks. 👌

Hey Tony, Tim here.....ANOTHER AWESOME vid on the dynamics of our beloved ICE!!.......useful, explained well, i enjoyed thoroughly!!!!....altho i knew about pressure pulse and crank rotation.....gotta say, didnt know about the 90-45 danger zone......i mean i kinda did, but it was never explained that concisely........NICE JOB SIR!!!!.......the last 2 vids have been PRICELESS for an engine builder/hot rod guy such as myself!!!

I absolutely love the analogies of these last few videos. As a sound guy this clicks like a Eureka moment. The movement of the piston is like a sine wave, maximum change velocity follows maximum pressure. For the piston the force is external so we start at cosine (degree wise) but the x-axis is the same so at 90 degrees cosine zero amplitude has been reached and rarefaction must occur. Putting energy in past that point thus nullifies the energy, which is impossible in the confined oscillating motion of the engine, thus blowing it up. I hope this makes sense, as this is the simplification that I needed for this to click in my head. I never thought of the duration of burn this much before and now I totally understand the importance of it. A teacher is someone who can convey knowledge. An excellent teacher is someone who can understand that the student does not know everything the teacher knows and finds analogies and ways to let the student not only grasp the knowledge but thinks it over. Thanks, Uncle Tony, for being an excellent teacher! And for those who don’t understand my ramblings: I’m not even close to a teacher so my apologies 😂

You are the very best auto shop teacher that I have ever had and I have had many!!!

This is my favorite video you've done so far. While I understood the principles of this, to hear it explained by someone who has ran exotic fuels (which never happens in the racing world) gives a clearer understanding of whats going on.

Alpha, you are extraordinarily gifted in breaking down the basic principles of the inner workings of ICEs. You present the information in such a way, utilizing visual aids, that render the material completely accessible and understandable to even a novice. Your thoughtful and articulate presentations are extremely useful and enjoyable. I have enjoyed watching you develop into a YT phenom old friend. Bravo dude...

Perhaps the best explanation of how things work during the power stroke, that I've ever heard!

I have to say…..out of all the stuff I search and comb thru for good info, this was the most eye-opening, extremely well explained lecture i’ve seen ….period!! I now will call you Professor Uncle Tony! Thanks for giving and sharing your knowledge with us all.

Shake hands with danger. That old safety flik was great, the guy getting his hand cleved off while using it to grease the pin hole on the d9 was gnarly! I'll never forget that and much more from it!

There's all kinds of gems rattling around that nugget of yours. Some things there i bet most people never thought about

i bet more viewers just learned something here than graduated high school last june ,the last 2 videos were lessons most could of never gotten anywhere welcome proffessor tony and the 2022 class of higher knowledge great job uncle tony

Thank you for boiling all this down for the common folks 🤣 great as usually can't wait to see the jet finished up soon !

I really enjoy these explanations. Uncle Tony knows his stuff.

Wow! You never cease to enlighten and amaze, UT!! 👍😲

UTG you speak like a top fuel guy. Perfect understanding. Welldone.

Love it. Shake hands with danger! Beat line ever!!! Thanks UT

THANK YOU. I wish I had known that 40 years ago, when I could have done something with this information. but, I will send it to my brother, who will share it with my nephew, who is also a gear head.

I'm was an aerospace engineer, but every time I listen to you I learn something or it makes me think about the engineering with new eyes. Thanks Tony. Keep up the great channel. 👍

Kinda like the hot / crazy matrix for engines. 😉

Piston speed, cylinder filling, flame propagation, squish etc. Find the sweet spot. I got exhausted with it. Tony's got good shit here for the aspiring engine builder.

These are my favorite type of U.T. videos!

I didn’t know how much I didn’t know but thought I did, thanks Uncle Tony.

One of the best UT videos to date

You’re the best Tony, just a great command of the English language 👍 my hat off to you 😎

I've studied David Vizard extensively over the years, but every once in a while I still learn something from you. Thanks again Tony.

Could you imagine having uncle Tony as your high school shop teacher?

Uncle Tony teaches on this channel what I wanted to learn in college getting my ASE cert. Valuable teaching.

From 1984-2002 I sent most of my time working for 4 different current or former Pro Stock racers. I dearly wish you had been on you tube back in the eighties! I was a wanna be' racer but took up block & component machining and did some assembly work. I wish I could've understood all this long ago, Thank you UT!

Love shaking hands with danger

Excellent, in depth, informative video lesson. I could watch this type of educational program all day. Thanks!!

That is why DV and I put so much effort to increasing low lift flow of a cylinder head combined with achieving good swirl! Fill the cylinder with as much air/fuel charge as you can and then get a complete burn... Good things happen! Andy

Wow!!!!! All of a sudden the torque of a diesel makes sense. Stroke and rod length affect on power and economy starts coming into focus. Not that I'll ever be calculating this stuff, but it's great to know what the objectives are. I hated school but I love this! Thanks Unk!!!

Great teaching! I’ve gleaned a lot from these past few weeks of videos.

I get the feeling I can apply everything I've learned here.......to the bedroom! 🤣🤣🤣👍

The INFERNAL combustion engine. So simple yet so complex. Great discussion on the vagaries of the theories of combustion. Thanks for sharing.

A great explanation UT, I got a more sophisticated scientific vocabulary but certainly no more knowledge and you've got it so exactly right! Listen up everyone, you can't get a better lesson than this!

Man, I learn more every day. I didn’t know you could make more power by opening the exhaust last a few thou, Thank You!

Mission accomplished Tony. You could teach some of these kids in engineering academia a thing or two. Their heads are all wrapped around theoretical instead of practical . Good Job!!

Frickin love your nitro stories and nitro knowledge. Nitro is a black art that I don't understand and am fascinated with. So hearing you talk from your knowledge base on the stuff not only further illuminates my love for nitro, it illuminates my understanding of engine timing, valvetrain, in the 4 cycles. Fuckin sweet, man

I love these type of videos I usually watch them 2-3 times to fully grasp the concept, Tony is my engineering teacher I swear!

Now lets make this even more complicated and explain how bore and stroke effect this, over vs under square. Lol I love the way you explained this, great job!

Uncle Tony you’re the best. I wish I had a cool uncle like you. I’m a uncle now but only have niece so they don’t really care about my interests.

Excellent explanation of a very complicated subject regarding piston strokes in relation to crankshaft rotation. Honestly, UT would be an excellent auto shop teacher. I applaud his knowledge and procedural wisdom. 👍

Every time I watch you I learn a little more. Thanx Tony:)

I learnt something new. Another excellent lesson Uncle Tony. Cheers & stay safe😊

UT, you should talk about 2-stroke porting and raising, widening, or lowering the exhaust ports. It's the same premise, but oh so much easier to see/feel/do.

Basic engine fundamentals? Man I've been waiting over 40 years for this kind of knowledge! So many variables in an engine, much less a true performance engine. But I never got to hang around d a fuel car! You the msn...

This video and the last one on combustion really opened up my eyes. I learned a ton and have a much better understanding of the process now. Thank you.

I really really like these types of videos. Some people like to buy shiny popular parts, I'm that kid that asks why. Uhm, even though I'm older than you. Thanks Tony!!👍👍👍

You managed to get new information into my thick skull. Well done.

What also helps make that four digit HP is simple displacement--back in the early days of cars, Indy had like a 600 cid displacement limit since the technology didn't exist. and of course at 600 cid today, that's typically a big bore with less valve shrouding--so we're talking about quality of combustion mixture. the problem with adding more oxygen to the combustion is it turns into a torch and wants something to burn or melt--either a fuel or an alumimum piston. Ultimately, these videos are reminding us just how inefficient a 4 stroke is--most of its motion is pushing the other pistons around.

I will watch this one over and over and over. There is so much hear. Looks like that green is starting ti stick to you.

When Uncle Tony speaks everybody listens!

Dude, you explain things so well, so , so many of us can understand. Thanks!

Explain how different cams and ignition timing effects what you are talking about.

I would assume this principle is why an engine like the current 5.7 hemi with only 345ci can make 395 hp and 410 ft.lb on pump gas when we had big blocks in the 80s that made no where near this much power per cu.in The Toyota Tundras 5.7 blew the big three out of the water in 2007 when the 5.7 make 381 hp on 87 octane. The current Ford 5.0 makes 400 hp. Insane number for such “small” displacement The key is they all do it reliably. . The advanced engineering, vvt ,extremely precise fuel management and ignition's allow what Tony explained to really be utilized in modern engines safely Great explanation. .

it's been a long time since I've heard this explained and you did so very clearly most anyone should have learned something,thank you

I immediately head that guitar riff when I read the title . Shake hands with danger . 😂😂😂😂😂🔥🔥🔥

You're making me revisit some thoughts and theories I had, in the early 1990's...

Shake hands with danger I love the reference when I was in shop class my teacher said we were the only group to ask to watch it over again we thought it was hilarious

Dude I love how much knowledge you put out there for us! THANKS!

Terrific explanation. All I kept thinking about was the pedal/crank on my bike, and learned at a young age the best powerstroke...it's the same.

One of the problems you run into with diesels is how many degrees of crank rotation it’s spraying fuel. If the injectors aren’t big enough it takes to long to get all the fuel in and you’ll end up spraying outside the piston dish. Push it way to far and it can get into that bottom detonation since you’re effectively extending the burning of fuel that long. With the modern injectors they can do multiple injections for the power stroke. Though, it’s generally only done so the engines are quieter and cleaner burning. Basically makes is a longer gentler push instead of a single big bang. And, usually only done at low rpm and idle.

You can feel it in your legs when you peddle a BICYCLE!

Thank you, Tony.

Tony you are a blessing to mankind

If you really want to go into engineering physics it's a very deep rabbit hole. Uncle Tony explained this very well. Power, power stoke, power duration. Ect. If you want to debate me. Let's go! I'm not an engineer but I did sleep at a Holiday Express.

A vid series on Nitro would be really interesting. Especially if you could find a fuel car to play with....

A great follow up to the other video. I had never thought of it as you have explained but it makes a lot of sense. Thank you for sharing with us.

Hey Tony, Thanks for a wonderful explanation on how this stuff works.

Thanks Uncle Tony! This really helps us to understand how VVT and flash injectors work so well👍🏻

Great info Tony! I learned a lot. Thanks!

Very "Scientific" explanation in my opinion.. Thanks for another great video! 🇺🇸🇺🇸🇺🇸🇺🇸

You covered this slightly in your original slant6 videos few summers ago. However can we discuss long stroke vs shorter stroke. And how cheap the different mechanical advantages and dis advantages each

Tony, you have the most underrated automotive knowledge on the tube. Excellent layman explanations on all of your videos. Keep up the awesome work!

This was some extremely interesting tech issues, I’ve never heard or considered

UT really takes this topic seriously and this is great for us. But I was thinking a little bit when this sruple came up in my mind: I think that 90° on crank is not accurate as the angle of most torque. My opinion is the most torque appears when the conrod is perpendicular to the lever of the crank. The force in the rod is paralell to the rod and this is the posotion when all the force goes into the turning of the crank. This depends on rod/stroke ratio, but basicly is around 70°ATDC. I would say that happy zone must be around this angle (70-75°). Correct me if I am wrong. I edited my comment the second time because I got busy with excel and calculated piston positions and speeds...

Loving these fundamental vids Tony. Keep em up!

That is a great explanation!

I definitely got something out of this one as well …. I hope everybody appreciates what uncle Tony does this is like sitting in a free classroom …

Great presentation. Very clear and easy to understand.

The happy happy zone... *Guitar riff plays* Shake hands with danger!

Now that you mentioned it, I did get something out of that. Thanks, Tony!!!

This video and the last video were by far hands down the best 2 videos Tony has put out. I have heard these principles of the as tony says the "happy zone" I have read about it magazines and just maybe understood it, kind of, sort of but not really and now I do! and it was easy! to thank you so much tony lol but I don't think I will ever be playing in the happy zone.

I am not attempting to criticize nor troll, I am a huge Tony fan. And no one really cares about the math, see how I get jumped on for pointing out a detail. Absolutely keep it up, Tone, 👻🐮

Thank you Tony!

I thought I knew it all, being an avid gearhead myself! Yeah, I kinda understood the concept, but I never really thought about the dynamics of what was happening. So a few degrees after TDC, the leveraging effect on the crankshaft is very small because everything is practically straight up, but as the piston goes down the hole, the leveraging power increases as the crank throw moves towards 90 degrees. So yeah, I get it! Keeping that pressure pulse going all the way to 90 degrees would be optimal. Hey, I learned somethig new today!

Mate , we get something alright. Luv the stuff that takes a cupla listens to really soak in. UTs a mad teacher buti imagine UKs forgotten more than i'll ever know too . Cheers

Really appreciate your videos!

Great explanation. I love it!!