Other Factors In Head Porting

I talk about other important factors in head porting.

[@4btguy945]

Being a new porter that makes a few bucks doing it. I have found every answer reveals 3 more questions. Everything is fluid.

[@davidresar8256]

Excellent video! Alot lot of people don't think about the sum of all parts!

[@Jbomb-ep4jr]

Excellent excellent excellent!!! Lotto ticket analogy was brilliant.

[@timothyarnott3584]

Hey Eric, Tim here, this is probably the BEST tech vid i've seen from you in a while.......and i cudnt agree MORE with you pointing out the other factors, in porting a head, Vizard (altho super smart, and virtuoso-ish) usually goes for high rpm/max power.......you shed light on lesser camshaft/cube issues one shud address when changing/porting a head......it all has to work in harmony....like my record breakin Stock Eliminator buddy said/preaches.....COMBINATION, COMBINATION, COMBINATION!.....it all needs to be happy with the cubes, rpm, and camshaft......SUPER AWESOME vid sir!!!....i was agreein with you out loud while watching......(a fly on the wall thought i was nuts).....THIS vid is EXACTLY why i own 3 t-shirts, and spread ur chanel word out to every smart individual i run into.....THANKS Eric, .....just THANKS!!....PEACE to you sir!!

[@davidholcomb9961]

Great job explaining the complexities of head porting. There are so many variables to consider that it's mind blowing. Personally as an ammature i will stick to cleaning up sharp edges and good multi angle valve jobs, especially because of the factory designs. Mopar's magnum head is a great example; look into the intake port from the valve seat side and it's like going through the grand canyon! The push rod pinch is SO intrusive it makes me wonder what kind of rocket scientist came up with that design? I think the old style port with a modern chamber would be better than putting a road block at the beginning of the port!

[@1crazypj]

It was probably designed OK originally but kept getting modified for packaging and ease of manufacture. Then someone looked at how easy it would be to cast and got further modifications until it's where you see it.

[@johnginnitti4452]

As always, fantastic information Eric and very well said. The lottery ticket analogy was PERFECT. thanks again for sharing all your knowledge, experience and insight.

[@jasonstormoen]

Edit: I see a lot of comments who missed what Eric was saying. I would say you nailed it. In you last video my comment started out by saying, there are so many thing that play a factor, and then I went on. I would say your videos are the best at explaining, showing, and keeping it real. I ain't gonna say the company I been using for some years now because I don't do that on other's channels out of respect, but thats how tgeyve explained it to me.

[@rong4189]

Great video for an amateur like me too. Thinking back, you never saw ‘CSA’ or ‘Divergent Cone’ in those three page magazine porting articles lol.

[@JamesMiller-v4s]

I'm no head porter, but it seems to me that shape defines most of the other items on the list. If the shape is wrong, and the CSA is right, then some areas will have low velocities and other areas too high. Shape extends from the air inlet at the carb entrance, or possibly the air scoop, through the carb/TB, intake manifold, intake port, past the valve seat angles (part of shape), into the chamber and across the piston and the dome if there is one. On overlap, then it extends out the exhaust port through the headers and collectors to the final expanse into the atmosphere. Valve locations in the chambers would change the optimum shape of the entire path. Many years ago I had a grad student try to model a single 4bbl manifold and head port design on the Ricardo WAVE program. The only info I got back from him was the intake manifold design was very sensitive to small changes.

[@yodawunn6700]

If it were simple, the 'perfect port' would've been figured out years ago and every head would have that perfect port now.

[@clarkmcmahan1595]

Well said Eric .you Do a great job ...keep up the fantastic work .

[@pinkysgarage4517]

I've been watching for months and subscribed today. Thank you for all the information you give AND the time you invest. You obviously have tons of experience and know what you're doing. I don't have a race engine, but enjoy all your testing and theory explanation. Keep up the great work!!

[@terryenyart5838]

Great information. Lots of different heads out there & endless combinations & end uses. All requiring a possible different approach.

[@leprechaungarage]

I thoroughly enjoy your videos .

[@1crazypj]

I've always listened to everyone, even when obviously wrong. Followed David Vizard's recommendations much of the time but sometimes the generalisations don't work so well on motorcycle heads. The last 20 years or so, 4 cylinder Japanese motorcycles have had some very good port shapes and sizes which are quite difficult to improve on. (the ability to actually pull from idle to 12,000 rpm or more, although not a great deal of power/torque below around 6,000rpm). As you said, it's the entire package including intake and exhaust length, diameter plus cam spec. It's why I've questioned you 1" lift flow a few times as that gets difficult to control valve and needs heavy spring plus may not actually be needed except in a motor with a narrow operating range? (although 10,000hp from an 8 litre engine is very impressive)

[@Fk8td]

Cfm, port volume, velocity, port stability, the tumble it creates in the cylinder and the ports ability to maintain fuel dispersion all play role in power output. Port size and flow per application. There’s so much involved. It’s always the ones who don’t port heads who get stuck on just one thing.

[@WeingartnerRacing]

Yep

[@rolandotillit2867]

Excellent well thought out video, I like your analogy.

[@jonathoncouchey7151]

Almost every cylinder head is going to have its restrictions and limitations. They key is knowing what to do to inprove it. Which usually for a head with a style new to you may take a couple of junk heads.

[@chevyrc3623]

I have kinda wonder on Richard holdner on why the ported LS Cathedral port and rectangular port didn't make much difference on the Dyno even though the cfm was way different I have always wondered that then he did ls3 vs ls7 head both ported and made no difference so I am glad you said there are other factors and you said the cfm is way more then the engine is needed

[@sergioriva3354]

4 thumbs up Eric, that's exactly what I like to apply on my head project (as soon you'll have the time) Thanks! Sergio - Italy

[@gabrieldimarco9646]

Thank you Eric, good explanation.

[@billrobison6314]

At the end of the day my biggest interest is in the shape, and what it does for your top rpm's.

[@jute91]

Have you ever tried milling a step on the spark plug side of the cvlinder head for reducing quench on that side? I was thinking if the chamber shape could be shaped more towards piston and that flat spot would be stepped down. So the angle of the corner of the chamber could be closer 45deg than 60deg. Also welding up the chamber on that side and using longer spark plus to bring plug to more center of the bore is one thing on my mind. Cheers from Finland

[@MrKawa74]

Keep Air Flow between WALL to Valve Angle during Liftas long as Possible, Adheshin, Less Tumble, Better A/F ! , be that 45*- 50*- 55* Valve Angles = Smaller Chamber ? Faster Flame , More Complete Burn

[@julianjennings4638]

Where science and art mix. Knowledge is one thing. Wisdom, is knowing by experience what works.

[@Jeffsa12]

Good stuff Eric! One of my all time favorite vids you've done to date! I find thinking about high flow LS heads that have more flow CFM than required for the hp goal an interesting and all to common case these days. You always say, "I'm no superman". OK then, how we call you the "Aquaman" of cylinder head porters... LOL. Yea, we know all too well how fast and how much you like swimming and water. Eric Weingartner, the man known in racing as Aquaman Eric, right along side Smokey Yunick, Grumpy Jenkins .......

[@ericvansco]

2.02 valve in the house!!!!! Good vid.....

[@johnaubreymitchell7128]

I bet you were a great teacher

[@robertwest3093]

Thank you so much for this video! It really opens the eyes on porting.

[@timothybayliss6680]

I look at what the guys do for EMC. They do some strange stuff though, they almost ignore flow under 0.200, lots of time they have huge overlap and adding low lift flow doesnt help or hurt. They almost slam the valves open and closed and really try to make the head work.

[@MrNeildrake]

You’re our Superman❤….especially if you do some research with gen V heads….please!

[@Nt0759]

I watch and try to absorb your entire vid 😎

[@v8packard]

You can add port energy, motion, efficiency and valve angle, in no particular order to the list.

[@smokeysghost4759]

…and when the head port is “perfect” ……here comes the intake manifold

[@jamesandannschmitt6835]

Hit it out of the park! Also what application...i.e. oval track, road race, drag race, tractor pull, mud bog. They are all in need of thoughtful consideration

[@julianjennings4638]

Eric, do you watch David Visard? Experience over knowledge, any day! Thank you for your time and patience and effort. Keep at it, because I have learned from you! 🎉🎉🎉

[@WeingartnerRacing]

No.

[@psychoholicslag4801]

If it was as simple as some claim, those software prediction programs would be way more accurate. Too many interrelated variables involved to say one thing is the most important. What about charge ramming from length of runner, cross flow from I/E from overlap, coefficient of discharge, humidity, fuel type, swirl, fuel drop out, etc...

[@chevyrc3623]

Well I just watched from beginning to end dang that is a lot to go threw a head porter side especially that you get so many different heads and shapes sizes and everything I am like oh my god that's a lot and this doesn't include manifolds to you gotta look at it's like man no that's must be a lot 2hen there is so many different styles of both heads and intake manifolds

[@2kcasper124]

What’s your thoughts on the old school 867 Pontiac heads compared to the new technology heads?

[@HeadFlowInc]

People forget there’s a correlation between CID and Intake port volume not only Max Flow. Trends be changing and confusing the masses. Shocking fact: BTR doesn’t recommend Rectangle port heads on an LS under 400 CID. Say what? 😳😳😳 Facts

[@georgedreisch2662]

The world is full of sh*t talkers. People that grab onto single aspects of a subject and repeat it religiously, while not putting together that many of these “most important things”, are simply expressions of the relationships between all of these elements and are factors / variables, dependent on one another. The sum of the choices made, within the allowances of the architecture of the SYSTEM, are the resulting performance for a specific set of objectives, most of which too many are not realistic to themselves of. Keep up the good work and thanks for sharing.

[@shootermcgavin2819]

Coefficient of discharge

[@markbogle8062]

Thanks for the infor

[@rimka11]

You can't have too much cfm. What you actually have is too low rpm of that engine for that head.

[@DSRE535]

And not only everything you mentioned but then you have to apply that to the cylinder heads that are going on and engine and you are trying to make the most horsepower in the rpm range the customer is intending to use that engine for so it’s always a compromise and then they can go And put the wrong camshaft in it or the wrong intake manifold and completely ruin any gains he might’ve gotten from your port work you really have to design the entire combination from the ground up for its intended purpose and every single builder is going to do it a different way lol

[@mattrich1081]

Thank you Eric

[@juhanahuovinen]

Why dont you target the velocity? -juhana

[@WeingartnerRacing]

I target sizes which gives you velocity.

[@johnnyboyssite]

Have you run across David Vizard's knowledge base?

[@WeingartnerRacing]

I know who he is. I try not to watch his stuff.

[@rogerupperton840]

@@WeingartnerRacing He has been quite complementary about a couple of your vids.

[@dondotterer24]

Have you used The IOP program from David Vizard and Stan Weiss ?

[@WeingartnerRacing]

Nope. I have used some better easier to use programs.

[@dondotterer24]

@@WeingartnerRacing ok thanks

[@biastv1234]

Valve shape as well

[@minecrafthacker9582]

Are those inline 6 heads in the background?

[@mikemcnamara2943]

Maybe a silly question, what is CSA, I haven’t heard that term.

[@JR-The_Godfather_of_Horsepower]

Cross sectional area

[@mikemcnamara2943]

@@JR-The_Godfather_of_Horsepower would you do a video on air speed testing the different areas, and possible changes to move the air around. Thanks for the great content, by the way.

[@JJONESMX09]

Well said!!!! Agreed 💯

[@terrywillis5784]

Please share with us when your clients win races. I would like to follow them on Facebook.

[@davidreed6070]

Velocity gradient.

[@racerd9669]

You need to change #1 to wet flow.

[@biastv1234]

What is CSA?

[@biastv1234]

Gotcha at 9:27

[@MauricesExoticPets]

Cross Sectional Area

[@davidphillips3953]

You can't make 800 HP with 200 CFM (N/A) no matter what the velocity or cross section is, YOU HAVE TO HAVE AIRFLOW!!! Sure you don't want fuel falling out of suspension or washing out the plug or what ever but you can not make HP without airflow period! That is why it is a big selling point that people talk so much about. All that stuff and more needs to be considered but you have to have enough CFM. In the small block mopar world people are obsessed with the "302" casting number head, it has the lowest flow of any mopar V8 head ever but people get hung up on it's really high velocity, high swirl and heart shaped chamber... then after they build their engine they're like "what to I need to change to get more RPM?" and "it won't rev past 5000 RPM do I need a bigger carb or bigger cam?" no matter what cam, carb, intake, exhaust... it will not make the 500 HP they are after because it only flows 170 CFM stock or even with bigger valves and profesional porting flowing 200 CFM.

[@basedsigma5634]

Bro...how can you do flow tests at .800 lift on these stock heads. Those heads will never in a thousand years live in a motor with that size camshaft. Keep it real...like 50 lift

[@WeingartnerRacing]

People do .800 and up all the time. If you only have .500 valve lift you are leaving a lot of power on the table.

[@scotthatch4548]

Do you really believe that calculated cfm from cid and rpm in any way relates to flow bench cfm tested at a pressure drop of 28" ? What if you test at 30" and get a higher cfm? What is special about 28" other than so you can compare to other heads? Cfm is not some universal amount ... Your testing is all based on a constant pressure drop ... engine does not run at that

[@WeingartnerRacing]

Ok

[@leftyo9589]

guru or idiot, is all a matter of context! LOL

[@blackwidowpowersports6037]

If it’s a 4valve the importance change

[@michaelblacktree]

That's a pretty vague statement. Can you elaborate?

[@blackwidowpowersports6037]

@@michaelblacktree cfm is not much of a problem area on 4v but air speed is and chamber side of the valve and deshouding it is very important

[@MrKawa74]

@@blackwidowpowersports6037 I asked some 4-Valve "Experts" about Shrouding between V's and Chamber side Walls, "They just Flow over Tops and Bottoms of V's, ignoring shrouding ", High screaming Speeds

[@ronsmith7739]

So, what is CSA ????? Finally , Cross-Sectional Area !!!!!!!!

[@CompproB237]

Cross-Sectional Area

[@cassandraclark8568]

Why keep secrets to yourself, when other World class Head Porters have zero problem showing & helping others to understand. Bieneman, Morgan, Speier, Vizard ??? It's an honest question

[@WeingartnerRacing]

Your kidding right. I give just about everything. More than I have seen others. I even gave measurements inside the port.

[@cassandraclark8568]

Why don't you do an in depth video on how you come to the sizes you do, you just look like a generic porter otherwise. You give absolutely bugger all details, I've not once seen you map out a port before grinding & then explain the size you arrive at for the application

[@WeingartnerRacing]

@@cassandraclark8568 I have in many videos especially the early ones. I even did a whole ls3 series showing what the size and shape of each port did. Next time I suggest you search more before complaining about something not being there.

[@WeingartnerRacing]

@@cassandraclark8568 I even showed the inside measurements of the ports for two years of heads for a Christmas video a year ago. Please search next time.

[@billythebake]

Mr Weingartner, please send a refund of the $0.00 that I spent on this video, because you did not give me every single piece of information I could possibly want... 😆 By the way, whenever I see a video from you or Darin Morgan, I like to watch the thing from end to end - and rewind if I miss something

[@AWBElectrical]

I take it that your wife doesn’t watch your videos?

[@MrKawa74]

LS-New Hemi-Coyote ..... EFI Port Injetion Port..... are Totally DIFFERENT from Carb Heads -Ports?....SIZE wise? You are Flowing AIR ONLY, Air just goes around Turns without problems????? Add Fuel with WEIGHT , FUEL tries to go Sraight and SEPERATE from A/F MIX ? Darin Morgan Quote: "If it looks Aerodynamica , there is 90% chance it ISN'T? Darin:....: Valve is 12* to 45% to 90%, .Atir doesn't Like to Turn more than 15*...so .he cuts Multible Angles-Edgesf or Back Cuts, 2 to 3 Back Cuts? Fuel hits Edges and Re-Atomizes A/F Mix ? ....10 ...HorsePower ?????????? Valve ..STOP.....START.....STOP....Bouncing A/F back and forth. 50 times per SECOND @ 6,000.Stop..Start..Stop... My Thoughs on AIR Speed == Air Pressore ? Example..Shade Tree Low Pressure Under it, then High Pressure rush in creating a Breeze, High Pressure goes to Low Pressure ?? I see a Port With Average Speed 260-280 down the CENTER Port ----- with 300 Average Speed Surrounding- Rushinging - SQUEZING in on Low Pressure, Air Speeds up coming Thru a VENTURI, ... SQUEZING Min CSA... Like HourGlass...Funnel ..Pushrod Pinch Min CSA .... Valve Throut Min CSA .....? Easy to Say, HARD to Do ....................

[@minecrafthacker9582]

ImPORTant video!

[@davidleary823]

Nice post. A lot of variables🤪

[@crustynuts8262]

Most people hear what you say, but dont listen to what was said. Our language and educational system has eroded and Americans have an tendency to react and speak through emotion. Most commenting, probably haven't ported anything, they're just experts in their own mind.