Five Golden Porting rules - Rule #1 Part 2
Вставка
- Опубліковано 8 лют 2025
- In this, PowerTec 10, episode 34, part 2 of rule #1, DV covers the importance of the bowl shape as this can utilize the kinetic energy in the main part of the port to step up the pressure at the approach to the valve seat.
Just as a matter of reference here this is about the most comprehensive porting info on UA-cam and it will, from the tech aspect, take a novice right through to expert over the course of the 5 rule series. If you don't think we are going in that direction we would be happy to hear you comments concerning such.
Ive been doing heads for almost 30 years and have read your books at an early age. Used a superflow 600 when I started. Built my own flowbench 15 years ago. That was something I had to go after. The fact that this kind of content is available free from such a legend is still baffling to me. Always wanted to attend the AETC from superflow but never could. In any case I'm glad to see your still at it and I know I will do this stuff till the day I'm gone...thank you DV
Book name please
This gentleman is a genius thanks a lot
Glad his info is uploaded for all to access from here on out
🇦🇺🙂
I'm just getting started at porting my own heads,first time doing this.lfind all Good. Info I can and soak it up. Really appreciate guys like yourself taking time to educate me. Thank you!
Getting first hand knowledge from someone like you is a blessing. Underrated channel.
Holy moly, I thought I knew many of the procedures but not to the finer points you have patiently developed.
As a young (35) mechanical engineer and gearhead, knowledge like this is gold. I love the science and art of building high performance engines, understanding how and why upgrades work. I don't want the 'magic' of the internal combustion engine to fade. Thank you for sharing your knowledge!
Look up the patents for pivoting puppet valves. See if you can fix all the problems
Totally Bro, can't see the electric car community getting as excited over wire gauges and coil windings!
@@gregroles69 ,,,,ya mean the 4 or maybe three wheeled cell phones of the alien future,,,,,LOL,,,,I'll be dust in space........and glad I had my youth and era......
I get the feel this guy is an educator through and through. From the sound clips and art, to the rough cuts and I suspect that is because he has information he cares great about sharing concisely and straightforward. Which is all good, of course. Just an observation. This man is making me question the thumper head I purchased and to investigate to check his job. Which I do absolutely think is important. I originally came to see exhaust headers and looking to tune my own for a four cyl. But I obviously stayed! Lol. I do think there is verifiable truth to what the team has put together and I hope to put it to use as well!
@@gregroles69eletric cars are purposed to tame our manliness
I can't see why anyone wouldn't like your videos. Keep it up!
Mr. DV, in my own opinion, the more detailed your information is on the topics covered from your deep knowledge, the greater our knowledge about it. I personally appreciate your teachings and dedication in these videos. Thank you very much. Greetings from Argentina
This is pure gold how can anyone complain he’s a legend keep up the amazing tips please.
Years ago in the 1980's I ported the head on my 1978 Suzuki GS1000 when I installed a Weisco 100cc overbore kit following tips I learned from reading Davids article's. It was a beast, with an absolutely smooth pull from idle to 9500 rpm! Thank you David!
I remember when they hit the market!!, They were absolutely baddest thing around!!!
@@michaelhurley3333 That's true, I loved it so much I had trouble going to sleep every night for quite awhile, I just wanted get back up and go riding somewhere! It was two years before another bike took the lead from the GS1000 and if I remember it was the GS1150, that was it Suzuki being on top for several years though.
I can't believe he gives this information out at no cost to the subscriber!
I want to thank you for all the great books and information you've published over the years, Ive read them over and over again! I still reference them to this day at 52 years old!
,,,,,,,,Agree............I,m 73......got many of his books,,,,,,,will buy any he writes.......
I subscribed within 45 seconds of coming across the first video I randomly watched. I like that hones, no BS, no fake claims approach. I do think that isn't what the era favors, so don't beat yourself over what could you do to improve. You're a master and part of that is never stop looking for learning and improving. Nowadays people would watch your content and leave within 2 minutes without learning to go check stupid vids for 40 minutes not realizing they've lost precious time learning nothing. We're dinosaurs, in a way.
So did I!
Aerospace engineer teaching cyl.head porting wo😅w I learned from joe mondello the quote father of cyl. Porting and all he taught me how to do was hold the grinder better so you don't grind a crooked port. You learn from trial and error. Now if you can afford a CNC machine you can be a head porter no grinder and no dust to breathe. That shit put me out of work. Machines replacing humans. Terminator is coming!! Lol
Proud I found you!, I'm enjoying every second, Thanks D. V., You are the master!!!!
@@miketkac1199 There are many out there that could care less about cnc ported heads. They are only as good as the design the machine cuts.
I've seen a couple of video titles stating not to listen to David Vizard because blah blah and I know that's just to get views, I've followed your articles in Hot Rod or popular Hot Rodding or maybe Super Chevy since back in the 80's but the one i remember most is a photo of a Nova with the info on how to street drive a 13-1 motor. This info is a gold mine.
I watched this one year ago and hit the like button.
I wish i could add another one. Thank you David for your dedication to helping all the gear heads who want to learn. 👍
There is NOthing wrong with your videos! No lifetime pro like yourself gives out the pertinent info you do, they all wanna sell you something.
Was buying your books as a kid in elementary school obsessed with cars.
Any critics are from kids who expect to be entertained for free, and sure you know 90% of porting vids online are completely backwards, bad info going from one mouth to another.
To give us the benefit of youre lifetime of hard work is truly a gift!!
I have been working on an intern basis for a heavy equipment dealer, and kind of took a deep dive into engines technology. This channel is even better than talking to the old racers, and they're very good in their respective fields. Thanks so much for putting this out there!!! Some of us young'uns need some more instruction on how things work, rather than shipping heads off for CNC porting and not learning a thing.
That was Great, thank you Mr. David Visard. My name is John Sartelle. AKA, 1967 Comet This video makes me feel good and bad. Good for what I have done correct, and bad for what I have ruined in the past. Thanks for all of the great books and videos. I love to learn and videos help in the process.
I dont respond to requests for a sub. But this deserves an exception. Thankyou for spreading knowledge sir
Nobody goes into the details of how to make more power with our common auto engines than David Vizard. Thank you for providing this information.
You remind me a lot of my grandfather. I always wished I could have had the opportunity to have his help on my projects. These videos are extremely helpful and I respect the huge knowledge and effort you've put into all this.
Thank you so much David for sharing all your wisdom with us.. most of us are just gearheads and not really engineers or designers, but with the knowledge you are sharing with us we can go faster which is what it's all about...
Two kinds of guys in the racing world, loud one and fast ones. I choose the Latter. Thank you PROFESSOR.
Had a local head porter do a set of big block heads for me once. His work slowed the work that I did down.
Anyone paying attention to DV will realize porting heads is not all about flow benches. Max flow number is useless to me and average flow is what I'm after. A flow bench is a tool used to check the productivity of your work. If you suck, then that flow bench will let you know, buy it won't tell you where.
Thanks David, you are the man
To David Vizard, at the end of your videos, remind folks to click the bell twice (I think) to shown a "Black Bell" as new UA-cam software places your new video in the home page cue. But the "Black Bell" forces a notification on the screen if notifications are turned on, yet shows them a new video has been released.
I now live in a world where I understand GM systems as a GM tech, technical seminar instructor, 2 day classroom instructor on contract with Raytheon. Now retired due to medical issues.
I truly enjoy your detailed explanation of cylinder heads, blocks, flows chart results and more. I wish to buy a book(s) or attend a class, but unfortunately it's not in my future but not dis-heartened. Thus learning thru your videos.
I am sorry for you family's loss as having an empty chair during the holidays can hurt!
I am just a humble self-taught repair tech who had an excellent apprenticeship with a knowledgeable fellow who is no longer with us. But, if I may say so, you remind me of my Grandfather, an electrical engineer. I was one of few grandsons that enjoyed his daily garage tutorials. God bless! Have an great holiday season and everyone safe!
DK, ASE Master Tech since 78, retired. Thanks Mr. D. V.
Dean, I think I followed that but humour me here. Could you go through the first part of your post again for me to be sure of what you meant?? thanks
DV
@@DavidVizard David, The way I understand it, is the click subscribe-click once and you get a white bell. It says "Personalized."
But hit the subscribe to select the type of notification and choose "All". So basically it now says "All".
With this selection, a subscriber gets a "Banner" of their choosing. It may to top, left side, right side or whatever setting a cell phone user in General Settings will get.
If a transparent or clear bell, it places that new video in the line of people who responded to you post or comment, shows up in a line in UA-cam that is seen under "Home". If you have selected a black bell, you get a banner that shows a new "David Vizard: Explains Intake Porting #2" while a subscriber is in email, on-line at his-her bank, or sending a text message, it shows on the screen! You can click it and it takes right to the video or live feed!"
David, I never owned a cell phone since 2008, when working for Raytheon as I had to turn the phone in. I was contract labor for GM representing ACDelco and tore a rotator cuff and Dr pulled plucked plug on my career. So forced into retirement. I cannot figure out Facebook, Facebook Marketplace, or any other social media. It is not high on my list!
So I don't know, but on UA-cam, once they made they change, everyone defaulted to a "Clear Bell" so they have to take action to change it. I would only be guessing but this happened 3 or 4 months ago. So if Analytics for someone posting videos saw a huge drop in viewers, this is why.
I can figure out most of these changes, but thought I would tell you, as I hold you dear to my heart and sharing of experience and learning after decades of doing not just creating theory. I just like to learn! If one is not gaining new knowledge, then they are stagnant or going backwards!
Peace, Love, Joy to you and all from a 60+ guy in Omaha building a "Retro-Mod" 1967 Chevy 10 with an "LS" series iron block engine from my son's wrecked 03 Tahoe engine and 700R4 trans I bench built 3 winters ago, updating all the internals.
Thanks David. I have a huge respect for you and you knowledge. I will tell you, if you had detailed information into the GM "LS" engine world as you do with GEN 1 GM engines, your numbers would climb to 60,000 feet in the atmosphere because this is the new thing since GM introduced it in the Corvette in 1996. 1998 in cars and trucks (I believe) but this is all of the rage for 400,000 per year we're sold in trucks & vans alone. A huge market that I never knew about because I worked at a Buick Dealer. God Bless you sir!
Good advice good detailed description 👍 hit the bell and choose notifications. Helps to get through the algorithm 😊
Please David, continue what you are doing. You are an absolute Gold mine
Don't change a thing David your videos are a wealth of experience and knowledge through testing. Australia.
Good on ya David calling out the keyboard worriers. I port two strokes and really enjoying this series. Always looking to better understand fluid dynamics. Frankly I don't understand why you are going to this effort but I certainly appreciate it.
I really appreciate your input into all areas of an engines restrictions. You are a gem to the performance tuning world.
Back when I was 16, I bought your budget build Chevy small block book, and built a 355cid! You have been an inspiration to me and on the engineering side of making power
Bless you for all of the incredible information, you've worked so hard to bring us over the years, David. I know you've worked tirelessly to help all of us build better, faster, and more reliable engines for decades. I appreciate you so much
I can never get enough porting tips from you. Thank you so much!
Good morning David,
My name is Larry Hofer, owner of RAYLAR engineering.
You were my instructor in college in Tucson with Tom Monroe and Denny Wycoff.
Good to see you. love your show's, and I show all my friends your links.
I make a 8.1 GM aluminum Big Block head for the market. Darren Morgan designed the ports in the heads in 2001 -2002. I would like to get your take on these ports. are they current?
They seem to work well. The heads are completely C&Ced as delivered, but I always wondered If they could be improved at low lift.
The education I received from you and your friends years ago has carried me very far in my business world,
Thank you,, Larry Hofer.
THat is one hell of an endorsement, good on you!
Thank you for documenting and sharing your extensive knowledge.
I appreciate it, as I’m sure others do too.
DV. You Are Awesome as Always. I Have A Bunch of Your Books. You are My First Source. Thank You So Very Much for all of Your Technology & Wisdom.
I just came across your channel, one before on ignitions. Both were very informative, and I look forward to watching more of your videos!
Hi David, just found your channel, back in the late 90’s when I first started to be a race mechanic, all your books I bought were very very helpful, I cherish them to this day, and am about to pass them to my son to help on his journey of the joys of engine development. Thank you Sir.
Adam, Australia.
David: I love your explanations. They are worth the time to listen. Your principles for commenting on your work and criticizing any details misguiding your viewers is so excellent too. Keep up with the good work.
I read Tuning for speed and used for reference about 30 years ago and now I'm watching your videos to see what's changed. I'm in to a 750 Triumph bike head with parallel inlet ports. A lot of what I've done matches near enough, what I've seen here but there are still a few small areas for improvement.
Thanks
Great videos stared washing all u videos learning a lot but gonna used those knowledge on my 4 cl b series 😅
I can’t begin to tell you how much I appreciate this kind of information, thank you!
I Love your videos David. Please keep them coming! I'm hoping to learn through you how to port my own heads.👍👍👍
As part of the future generation of hot rodding, I can say that nearly all of my power theory knowledge came from David Vizard. This information is key to a younger person born in an era of diaposable vehicles. Years and years ago I sat down with "how to build max performance small blocks on a budget", and some very limited prior knowledge of engines, and built a reliable, snotty 406 for my daily driver. Once I understood how easy it can be, I got decent at it and quit my dead end job. Now my entire life revolves around assembling engines and doing cool things. I always knew what I wanted to do but it was always out of reach as a kid with no knowledge and no role models. We are so lucky to have this knowledge archived for this and the next generations
Thank you very much Mr David for your time and all your knowledge, they are really gold for me and all the guys who want to mess with all that kind of stuff. Best regards from Greece!
I've biult a few engines with my dad over the years. I have learned so much from him,my grandpa and my uncles. They never got into porting or anything like that until i started to. To me the info you are sharing for free is priceless. I love people like you good sir sharing your knowledge I am the same way love sharing knowledge i have of vehicles.
I really enjoy all your free information. This is such an interesting subject. I was a student of much of the Bill Thomas techniques during that period. I wanted to learn about porting. My first attempt was a set of Chevy double hump FI heads for a new 327 that I was building for my 1960 Vet.The project turned out extremely successful. At the time I would look down the port and it was obvious that the bowl and its shape was an extremely important area. That was a long time ago. Thank you for enhancing my understanding of the porting process. Your information is golden.
Great content! Love the steps you layout in all your videos!
I find myself wanting the videos longer. It is like closing a book before the end of a chapter! At least the man who has this hands on experience is sharing.
During a technical service seminar, we where told by Raytheon to hold some information back, leaving them wanting more! Maybe, I am impatient because I don't know and want to learn. I may never be in a position to use it, but I want an area of memory filled with David Vizard has learned, plus the ability to share. DK, Omaha. Retired Tech. (Built race car assemblies, but never raced)
@@deankay4434 yes I'm a backyard motor head and have ruined several sets of heads by following what some other bone head did to their heads on UA-cam. It's great to see the right way and the science that proves it! I'm a Millwright with 30 years in the trade, built and raced a little but can't afford to play very much .
Thank you sir for a very informative video , i've known you since the hotrodding magazine days , that's a long time . Your the one lecturer im always looking up .
My hat off to you, I`ve been building engines for years and I`ve tried to port heads and found I don`t have the patience or skills to do it, can`t even make a few passes with a cutter without it chattering so I send them to Champion or HVH cause they are nearer me.. If I had access to a bench I might take another shot at it as I`m retired now and only pick and choose which customers I work for. By the way I bought my first book of yours on Holley carbs circa 1988ish and when I read it from cover to cover I knew you weren`t a journalist as I was told, your knowledge and explanations were way beyond journalism.
Thank You for your program. Im a retired mechanic. Trying to learn how to improve the flow of my project engine im building. Its a 1967 Ford 240. I. 6 cyl. Im hoping to keep the original crankshaft/stroke but increase the compression. Bore tge cylinders im hoplng no more than 0.40 tho.over and using forged flat top pistons for a Ford FE. 352 Cl. V8. Nothing too radical. Mild cam shaft. H.D. stock 300 cast intake /exasust manifold. Its a daily driver. So im hoping to increase the m.p.g. as well as some powed.gain. i like what you were showing about EVERYTHING REALLY ! Balanceing the rods the knifeing the crankshaft ALL LABOR INTENSIVE LOW BUDGET TIPS. !! So BIG THANK YOU FOR YOUR VALABLE TIME AND INSTRUCTION S !
David Vizard, have you ever ported a set of mid 60's iron Pontiac heads? Layout and intake side of the head is very similar to a SBC. But the valve sizes are 2.19 and 1.88. I ported a set based on how the Chevy Power Manual said to do SBC heads and opened up the pinch as much as I dared. The info in the Chevy Power Manual is very much like what you teach. In the early 1980's I ended up with a low budget, stock bore and stroke 455 build with flat top pistons and flat tappet cam that ran 10.50's in the 1/4 at 130mph in a 3400 lb GTO and never turned it over 6200 rpm. I really enjoy watching your videos and seeing my engine building theories validated. I'm still learning and appreciate you sharing your knowledge.
Per your opening instructions. I LOVE IT! But I’m not big on fluff and appearances. Facts is what matters and I’m very grateful to have found this channel.
I appreciate the amount of science here, Not just myths and superstition like 99% of the old guys you meet at car shows or on the internet.
Very grateful for the immeasurably valuable information here on this channel
Thank you
All your videos are outstanding. Read millions, lol of your articles and books in the last several decades. Well done.
Thank you David, I appreciate your knowledge and insight on cylinder head porting.
Take care, Ed.
I am so glad you decided to make all this. I am loving this content, and I would consider myself a younger individual.
I just purchased one of your porting books the other day and then these videos started popping up on my feed, it's been a great addition to the written material cheers!
Love your videos Mr. Vizard! I have been reading your books for years and was so excited to find you here!
Me making a mental list of what I need to buy after watching this video: a small dyno, a small engine for which I could buy 20 cheap replacement heads so I can practice porting and know how far is too far and what is possible. This gentleman is such a genius, I think they misspelled his last name, it is probably "WIZARD"
I have several of your books and followed your suggestions. All I can say is you are spot on. From air flow, ignition, carburetor, to camshaft selection, and exhaust. Everything I tried that your books suggest is worthwhile. Thankyou.
I love your tech info and I love your high character David.
David,
Based on info in your books i have always started at the seat. Working back up the bowl & then out into the chamber. I progressed to doung the seat machining first. This is dangerous & most porters cut the seats after to avoid knicking the faces. But the care is worth it! I found air flow jump starting early.
I respect yourself and this channel, looking forward to future content.
I always find your videos fascinating.
I wish I had come to one of your seminars when I was younger and you were tuning the A series engine.
Thank you Sir.
As a student of Judson Massingill,in the early 2000's,and messing with heads ever since,this content is great..
I have been a fan since "Theory and practice of cylinder head modification". Worked on my sprite and vw heads! Thanks. It makes sense that both sides of the port are not equal in flow. They can't be. Thanks for the work you do.
Thankyou 4 ur great tips its stuff you can't guess makes all the difference.
Awesome videos. Love them. Don't change a thing. Thanks again.
Love your videos Mr. Vizard. I watch them over and over, to make sure I retain all this valuable information 👍🏻👍🏻👍🏻
Holy cow. I had no idea that scandium makes aluminum 600% more fatigue resistant!
I actually like that you have a hell of a lot of wisdom and experience. You're hiding how brilliant you are a bit.
My only suggestion is to put a disclaimer that these videos are only for highly intelligent people.
Subscribed since uncle Tony recommended it. Actually, this channel is what I was looking for professional tuning.
David, reading some of your works earlier on had a huge impact on my understanding of the small block chevy, and engine theory in general several years ago when I first took interest. Funny enough I'm actually at a weird crossroads where I'm building a motor based on some of the stuff I learned previously, and it's fascinating getting to relearn what you originally taught me.
When it pertains to actually attracting viewership, i can say that having an expert like Dave speaking has it's value, but that having pans, and shots in real life, and possibly demonstrations of some of the adjustments would be huge. Honestly, listening to an expert speak at an expert level from an entry level/intermediate theory position can be somewhat dry, and intimidating, and having someone available to simplify things further, or to actually show some of the work being done would be a huge boon for the page.
Thank you for continuing to share the engineering knowledge you have gained and fostered.
Great video thank you. I was a tad confused during a coyote of your transitive during the video but I got it figured out in short order.
Some people are unnecessarily rude online and I suspect they are cowards in real life.
Please keep the information coming. I'm clicking subscribe right now!
In the first part you talked about 88% to 91% of the valve size at the seat but did not explain so well how you are getting that. And you've explained what the finished product needs to be but haven't shown us how to get there. I love your videos and truly thank you for sharing this knowledge.
I have learned a great deal about head porting from your well detailed videos on UA-cam. Thank you for sharing your knowledge with us 👍
Hey DV...loved the part about the importance of bowl shape and "hipping" the transition from the port to the bowl.....thanks for another excellent video!
The music in your videos is so great really helps me focus
Thanks for your time and knowledge! I race dirt circle track super stock and I have a set of 23 degree Dart Iron Eagle 215 that HVH has cnc’d . As as racer always looking for more power lol I contacted Chad S. About having him rework my hvh heads. So glad to hear you reference him and it just gave me another reason to send them to him! Not sure how much power can be made with his special touch but I’m sure that there will be gains! Again thank you for your time!
Thanks D.V. for sharing. Bowl and port design on the BMC small bore heads would be on the top of my wishlist in a video, and of course a revision 4 on the Tuning the A-series, with larger pictures , drawings with scale and extended exhaust system part. Best regards Andreas
I like your style, old man. I've heard your name being bandied around since I think the middle to late 1960's when I used to buy nearly every engine-tuning publication I came across here in Cape Town.
Thank you for your video. Information like this makes me think I can rework my afr185s on my 408w instead of looking at the afr 220s. Ima continue watching the rest of the videos
Hola amigo gringo, se ve que eres un fregón en la materia, estoy recopilando información para hacer el mejor trabajo casero en un motor 6cilindros en linea de Mercedes Benz 1962 no voy a correr ninguna carrera, solo quiero que sea muy eficiente, pertenecía a mi papá, con tus videos creo que me va quedar muy bien Saludos desde CDMX!!! Y gracias profe.
I like what I see. Keep making these videos and thank you.
Absolutely priceless. To be shown by a master head porter like David Vizard. And it's free!! You in b
Great appreciation that you are sharing your experiences and the scientific verification!
Very interesting and well explained! And quoting Kevin Cameron just made my day! I love his articles in CW and Cycle Magazine back in the day 😁
Love the pace of you content...smooth and precise.
This is a brilliant explanation and illustration of how air really travels in heads. Really enjoying the science or how air flows and thus how we can then use this knowledge to improve things.
Great job explaining things to a average gear head 👍
You're my teacher you're a genius and you are God of all engine building and my idol Steve from Annapolis Maryland I learned so much from you thank you I'm not into race cars anymore I can't afford it
Another great video 😅 and am glad you mentioned the thing about using your own name, I always use my own name but was thinking of changing it to give me anonymity from scammers, cheers David, going to watch some other videos of yours right now 👍
Thank you, I watch parts of this many times!!!
Thank you sir such a wonderful video.Sir I'm am from Bangladesh. I regular watch your video. Sir keep going and give us that kind of informatic video
David thankyou so much for sharing your terrific legacy of knowledge with us I can't wait until you get up to discussing 4 valve type heads and your polyquad paper also Individual throttle body manifolds and there designs
Absolutely love these videos! The amount of knowledge is amazing. Feel the same when I watch Gale Banks as well!
Love your approach regarding not liking the video!
I just hope my “bowls” are big enough!!! He he he! Thanks again David bud! You are the best source of porting and power making on UA-cam! I’ve watched every single one of your power tech 10 videos!! Love them all!!
I got the other in the youtube stream, now looked at both and subscribed. Have seen some other yt clips from you 6 months ago or something like that. Many thanks!
I love the content in your videos. Please keep them coming ?
Thanks for an awesome video, I've learned a lot from you!
You asked for constructive criticism, so I would say some of your videos could be distilled down a bit, some of the anecdotes are not necessary for the technical information. That said, I thought this video was very well paced. You gave the essential information, very little else, and the information was not delivered so densely that it was a struggle to keep up. In fairness, even the videos that are less concise are still informative, and the anecdotes are fun to listen to. It's just a more conversational style and less of an educational lecture.
Thank you so much for sharing your knowledge and experience!
David thankyou so much for sharing your knowlage you are a champion.!!
Iam now comfident to start playing with my own heads.
Iam doing a rb30 six cylinder lead for boost and a set of ls heads i will keep you updated👍😀
Very nice. Cudos to Stan Weiss for helping to render the IOP. He's been quite good at revisions, updates, and an occasional epic manual on the Engine Parameter calc of his own CarFor program.
I really like these videos it has given me a lot of really good info on porting head's for A 350 Thank you very much and keep up the good work