Five Golden Porting rules - Rule #1 Part 2

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 YouTube 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.

[maxlacugnato]

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

[rolandotillit]

Getting first hand knowledge from someone like you is a blessing. Underrated channel.

[jnmason]

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!

[erreoable]

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

[juanignaciocaino]

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.

[LoganPEade]

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!

[anythinggoesgarage]

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!

[philipgreenwood]

I can't see why anyone wouldn't like your videos. Keep it up!

[someonehasthisid]

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.

[Comet-hngm]

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.

[StreetForged]

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.

[gerrypaulson]

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...

[deankay]

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 YouTube 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.

[toast]

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.

[thomasfischer]

Please David, continue what you are doing. You are an absolute Gold mine

[vuxojqp]

This is pure gold how can anyone complain he’s a legend keep up the amazing tips please.

[davesstillhere]

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.

[mattcummings]

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

[lesgaal]

Don't change a thing David your videos are a wealth of experience and knowledge through testing. Australia.

[kalibsima]

I really appreciate your input into all areas of an engines restrictions. You are a gem to the performance tuning world.