Veicomer - Head Porting Dimpling CNC Rottler P69

[@guycroft318]

can we have a back-to-back dyno test on dimple ported vs not finally PLEASE?

[@DrManhattan84]

Initially you should have better performance, but it will gunk up faster than a smooth polish

[@Nothingtoya]

This is good if you really like to take your heads off and constantly clean the ports.

[@393strokedcoupe]

Evap can!

[@jefferybernard4800]

Great idea

[@TurboJohn74]

@@DrManhattan84 On a daily driven street car sure. Who the hell would be doing that though? They will stay plenty clean for weekend warriors using high grade fuel and meth injected vehicles as well. Also, i see just as much gunk on non touched heads that see regular use... at least that's my observation

[@jessematilda]

dimples work on a golf ball by helping the airflow to follow the contour of the ball further round towards the back of the ball, so that the low-pressure area is smaller. That causes the reduction in drag that allows the dimpled ball to fly further. The only place there is an advantage for the inlet port is on the inside curve leading towards the valve, you get flow sticking to the inside curve instead of braking away in turbulence. O know this because I've done it. Not huge increases in top end, but amazing mid-range gains.

[@DamienKoda]

I have a little secret for you : the size of the ball (radius) should depend on the curve angle. the size of the ball should depend on the rpm you want to optimize. The arrangement of the ball should be in screw to better mix of gaz and to create a vortex, the angle of the screw depend on the rpm you want to do more torque. the whole thing depend on pressure in the pipe. All this parameters could be optimized with artficial intelligence applied in a cfm model. all because there isnt the same velocity and pressure everywhere in the tube

[@louly3212]

Had the same idea, or like the other one said to liven up the air fuel mixture atleast.

[@sadmachines6991]

Im SO pissed stumbling onto this video! I was an engine machinist and builder from 91-98 with jms racing engines in monrovia, ca. A year after leaving i became a cnc programmer and machinist for an automation company. 23 years ago i bought a 99 cobra. It had higher advertised hp than the previous ones. Turned out the engines made LESS. There ended up being a hp recall involving a new intake manifold, a computer flash and different exhaust. Took 2 years to get that recall. In 99, i pulled my intake manifold off and started working on it. I started doing them for people all over the country. 1 of my customers was from Dearborn Michigan, where Ford SVT was...the makers of the cobra. I did my special work for the mystery man, and when the new recall intakes came out, they had literally copied all my work...except for 1 part. I did dimpling along the walls. My thinking was to create a near zero friction boundary layer, much the way a golf ball is designed. Even Ford SVT couldn't match my intake manifold gains. I later made 2 shorter runner length intakes to take advantage of tuned resonance. My normal job took priority and I had to quit playing. :-(

[@Motor-City-Mike]

30 yrs ago, Kenny Bernstein ran an experimental body in NHRA Funny Car that was dimpled much like this. The theory is that the turbulent boundary layer air provides less drag for the balance of the airflow, as compared to the "friction" of the air passing directly across the surface. I know the first time this was brought to light for engines was in combustion chambers to help generate turbulence to make the air/fuel mix more homogeneous for more complete combustion.

[@jefferybernard4800]

What is the difference with air fuel mix in suspension flowing into the port it looks like the dimples would cause a slight turbulence to cause the fuel droplets to fall out of suspension and dribble on the port floor ? I would like to see a flow test with and without at the turn going into the bowl maybe the chamber

[@scottwa]

@@jefferybernard4800 In theory, it's the other way around. The mirror smooth ports can have the fuel falling out of suspension on the curves. I suspect this is more likely to have a measurable effect on a throttle body injected engine than a port injected engine and have absolutely no impact on a direct injection engine. I'd love to see back to back airflow and dyno tests between stock, mirror ported and this technique on and engine using the same head castings.

[@kenny.xturbo3315]

Good for drag race but for street/daily use is a nightmare

[@____MC____]

I heard its only effective if you dimple the spots in the chamber that have lower air speed like an inch bellow the valve seat.

[@robinsage1964]

Beautiful work on the porting, the way they should all be.

[@kristophs3276]

I was waiting for the base drop.😆

[@anthonydomanico8274]

I was waiting for anything interesting to happen. And I love machining!

[@hardcandy8642]

😂😂😂😂😂

[@stankybaby1]

The main benefit of dimples is to keep the air fuel mixture well mixed, it will aid low end torque

[@pietroarrigoni9186]

Not exactely. The goal is to create a fluid surface that stay stuck to the head port with no turbolence into which the air fuel mixture coming premixed by the carburator moves at super high speed (near half of the sound speed).

[@StrikerFin]

Pietro Arrigoni Makes no sense. Boundary layer will always exist. If that was the case like you stated airplane manufacturers would be doing it. The smoother the surface the better the air flows. Dimples I think, creates turbulence.

[@StrikerFin]

Pietro Arrigoni Maybe it’s to get the fuel/air to mix well?

[@123astraplanes]

Mmm 🤔🤔🤔 I'm not convinced? I'd sooner have a slight port and polish and chuck 30 psi down her throat 👍

[@coleschott007]

dimples create a low pressure area around the moving object ie a vacuum layer that creates less drag golf balls with dimples will fly farther than golf balls with out dimples., similar to a fighter jet that has the tube rod protuding out the fron with a tiny parabola dish on it one of its important purposes is to be an air disrupter so that the Jet will "slip" thru the air with less resistance, cool stuff to play with

[@154Jamesp]

Dimples work as stated above. Even bicycle racers are using them on helmets and clothing after wind tunnel testing confirmed the benefit of them.

[@coleschott007]

thats cool

[@2x4barrels40]

Ha Ha those dimples create LIFT that`s why golf ball go farther . Those dimples create DRAG !

[@asherrose4114]

so why dont race cars have dimpled body work if this is so effective

[@jamesnordaker7746]

only kinda. the backspin on the ball creates a low pressure point on top of the golf ball. that is why spin is so important on a golf shot. the dimples create less drag from the air on the surface of the ball, allowing the ball to stay in the air longer.

[@c4r5on88]

So I have manually by hand ported and polished to a very reflective and smooth finish my intake ports so far on my saab b204. I'm now wondering is it best that I dimple them. This car is going for maximum diy power capable. Lovely work by the way. Looks amazing. I wish I had the funds for such great work ❤️

[@Neudezign]

I've never seen this done before, but I have to imagine the air flow works something similar to how air travels around a golf ball, except inverted... I guess? I really am curious to know the flow characteristics on a flow bench for this head compared to one without that particular process done. Would this process be better for a high revving engine? What about port injection vs. GDI? We need to see some numbers here. How long did this take, how much would this cost to have done, how many man hours are you billing for? This really sparked my curiosity!

[@t_c5266]

dimpling is to increase turbulence which suppresses pressure drag due to flow separation That only happens with very high velocity flows. Dimpling without robust calculation to optimize reduction of flow separation throughout the RPM range is a bad practice. in other words, they just made this engine worse

[@a.cuevas7544]

@@t_c5266 how do we know that this engine just got worse? do you have the data to back up that claim? and how do you know they don't have the robust calculations you speak of for that particular head? just asking dude

[@t_c5266]

@@a.cuevas7544 yes. It's called fluid mechanics

[@michaelmays9292]

Thats a really good dimple port job

[@ebbonemint]

I thought of using the same concept as golf balls dimpling for my ports, Glad to see it’s already been done looks like I’m not crazy after all. Not bad for a 25yo kid with limited mechanical engineering/fluid dynamics background.

[@gilzianeoliveira6559]

obra de arte!!!!!! parabéns!!!!!

[@imacf90]

theres a guy who shows up on the boostedboiz channel every once in a while, phong. he built a crx with a k20 engine, naturally aspirated making 300hp to the wheels. he did this to his ports, but by hand with a drill. it seemed like a wild idea but the numbers dont lie. that engine usually puts out around 160-220 depending which model. it goes 10s down the quarter mile.

[@atfgarage9459]

It is true that just as golf balls, dimples can improve length of travel however you are looking for overall velocity. A golf ball is a solid mass object moving through the surrounding air, whereas gas particles move with the surrounding air. Huge difference. I would imagine this would raise the effective fuel to air mixture efficiency, but not with outright power where air speed needs to be maximized. This would probably be great for a mid powered daily driver.

[@Limou551]

DIMPLE IN INTAKE? AHAHAHA- GOOD WAY TO STEAL PEOPLE, THIS IS A BIG LIE. DIMPLE ONLY WORKS IN MOVING OBJECTS THAT HIT AIR OR LIQUID, AND HEY MUST GO VERY FAST OTHERWISE DIMPLE EFFECT IS NOT CREATED. BECASUE THE AIR HITS THE BALL WITH BIG VIOLENCE AND IN THE FRONT PART OF THE BALL IT CREATED A TURBULENCE, HENCE CREATEING A VACUUM ALL AROUBD THE BALL, BUT HOW IS CREATED ? JUST THE IMPACT OF THE AIR ON THE 5 OR 6 HOLES IN FRONT OF THE BALL, AND WE ARE TALKING ABOUT A BIG IMPACT, AND AN OBJECT PUSHING THE AIR VERY VERY FAST, NOW IN ENGINE INTAKE THERE IS NO AIR HIT, IN WHAT APRT OF THE INTAKE DOES THE AIR HIT? KEKEKE CAUSE THE AIR DON HIT ONLY PASSED ON THE SURBACE SO, THERE IS NO EFFECT DIMPLE, IN INTAKES DIMPLE IS ONLY USED IN SUPERSONIC ROCKETS AND TORPEDOS, CAUSE THE AIR HIT OR WATER HIT IS VERY FAST, BUT IN ENGINE INTAKE?? REALY ? IF IT HITS, MUST HIT IN A SPEIFIC POINT, WHERE???? THE INTAKE IS NOT EVEN A STRAIGHT TUBE, KEKEKEK GET ANOTHER STUPID INVENTION, YES THERE IS SOMETHING TO INTAKES BUT FOR SURE ITS NOT DIMPLE EFFECT, IF YOU MAKE IT YOU THROW YOUR MONEY TO GARBAGE, AND HELP A SCAMMER TO GET RICH.

[@great159]

SOUNDS LIKE A DAMN FLUTE!💯

[@tracylewisperformance1328]

We have been doing this with documented power gains for over a decade. It is real. We don;t dimple exhaust ports, only any internals surface on the intake side from TB, IM runners, and intake ports. The smoother and shinier a surface, the more surface area to create friction from the flow over it. Breaking up this tension enhances both flow and velocity.

[@Limou551]

YOU KNOW NOTHING.YOU KNOW SHIT ABOUT PERFORMANCE. DIMPLE IS ONLY CREATED BY A BIG IMPACT OF THE HOLE/S DIRECTLY ON HAIR, CREATING AN SURROUNDING EFFECT ON AN UNIFORM OBJECT, LIKE A BALL A MISSILE ETC, A AND THE MOST UNIFORM OBJECT IS, THE MORE THE EFFECT. BUT IN AN INTAKE ? KEKEKEKEKEKK WHERE IS THE IMPACT??? THE INTAKE IS NOT EVEN UNIFORM, KEKEKEK IF YOU SEE A BALL ONLY JUST FEW HOLES CREATE THE EFFECT , THOSE IN FRONT OF THE BALL, THE REMAISN HOLES DO NOTHING.SOOOOOOOOOOOOOOOO SHUT UP, DONT LIE TO PEOPLE

[@ConTheDon187]

homie, speak english if you're trying to front on everyone. @@Limou551

[@MyCatInABox]

Wow....THIS is impressive. JUST like a golf ball....

[@kopitothai8163]

I think it work on convex surface to reduce separation behind the ball.But, for concave surface.Does it work ?

[@youwantshum9860]

I thought a smooth port and polish would allow for better air flow. How does The dimpled port work?

[@siapitapit3605]

because a smooth port actually create a "rich" fuel without really fusing with the oxygen, fuel without oxygen means less power, sure u still got power boost than the stock unpolished port. these "dimples" making the fuel fuse with the oxygen lot more and that means lot of power and more efficient than the smooth polished port.

[@Mroswaldo16]

Any dyno sheets to proove that works? Or flow meter.

[@charlesdefrancisco5056]

Iv seen this before and the golf ball analogy is interesting..how about coming up with some flow numbers and port velocity

[@tiliusvaughan7321]

what does air flow or dyno result show!?!?!?

[@jasonmoyers1478]

I have first hand experience with this method on a customers car. It was really a cool idea. But.....we’ll. I’m not going to beat up anyone’s choices in money spent, because we’ve all bought questionable things in the quest for more power. It did make slightly more torque, I’ll have to look for the numbers, it was around 3% if I recall on an srt8 Jeep. This was replacing the stock 6.1 heads. Golf balls have dimples, for lift, not velocity. Anything that creates lift, creates drag. Just like in aviation. There is no free lunch.

[@dinukap4]

Couldn’t have said it better.

[@余承恩-y3x]

The question is does it really work?

[@hksjoshua]

So what was you're end results mine is 2700hp at the tire on customers s13 Nissan sr20 2.1l

[@Mindwerkz]

With dimples, would one want to extrude hone before, after or not at all?

[@jamesnordaker7746]

before.

[@caslone88]

Seems like it would be good for 2 strokes

[@4DIYers]

That's pure art right there... Too bad it's hidden once installed.

[@4DIYers]

Yes it does increase horsepower, it increases air flow. Same as a golf ball. People wouldn't be spending a small fortune on doing this if it was not effective.

[@1flynlow]

some would

[@d4rkhound388]

I mean.... it really only works on forced induction vehicles, in NA vehicles it just spoils the air...

[@Limou551]

@@4DIYers nO IT DOESNT. iF YOU WANT PERFORMANCE YOU HAVE TO PREPARE YOUR HEAD. CHANGE THE DYNAMIC OF THE INTAKE AND EXHAUST, BUT BIGGER IS NOT THE BEST. IAM NOT GONNA EXPLIN HOW HERE. SO BE PREPARED TO LOOSE ENGIEN PERFORMANCE WITH THIS OPEN THROAT PHILOSOPHYU. YOU CAN PUT "INJETORS" IN INTAKE, ALSO IAMNOT GONNA EXPLAIN HOW, OR WHAT IS THAT.. AND IF YOU WANT TO TAKE OFF MATERIAL, CANT TO THIS WAY VEICOMER DO, IT CAN ONLY BE MADE BY HUMAN HAND NOT MACHINES, YOU WATCH WERE CARBON IS AND THEN REMOVE THE MATERIAL -JUST IN A AREA RELATED WITH THAT PHENOMENA YOU CAN REPOSITION THE INTAKES TOO...ETC SO, AS YOU CAN SEE, YOU PAY FORTUNE WITH DIMBLE TO HAVE NOTHING, BUT MY HEADS WIN RACES.BECASUE I PREPARE THEM, IAM NOT JUST A MACHINIST THAT ONLY MAKE WHAT CLIENTS SAY, OR JUT OFFER DIMBLE, I DONT NEED TURBOS , TO WIN RACES. I WAS IN A PROJECT THAT THE OWNER ANDRADE DIDNT BELIEVED, HOWEVER HE WON A NISSAN GTR WITH 2000 HP BITURBO, AND EVERYTHING THAT APPEARED IN AMERICA , WITH JUST AN ATMOSPHERIC ENGINE.AND WE ARE TALKING ABOUT DRAGSTERS. i REPEAT THE GUY WON EVERYTHING WITH MY ATMOSPHERIC ENGINE, INCLUDING A BITURBO GRT SHIT WITH ALMOST 2000 HPS, DO YOU UNDERSTAND ME? AND I DONT PUT THAT DIMPLE IN THERE, CAUSE THATS A STUPID IDEA, I THINK IT IS JUST TO TAKE MONEY FROM PEOPLE. PREAPRE AN ENGINE HEAD TO RACE HAS A LOT OF KNOWLEDGMENT THERE, AND THOSE INFORMATIONS DONT GET OUT, EASLY, TO COMMON MACHINISTS OR PARTICULAR OR SMALL SHOPS. YOU WANT POWER, YOU NEED SOMEONE WHO KNOWS, THEY ARE SECRETS... THAT WILL NEVER GET OUT. hOW DID I LEARNT IT? WORKING WITH BIG COMPANIES AND OBSERVATING EVERYTHING. yOU HAVE TO STUDY A LOT AND USE YOUR INTELIGENCE. aN ENGINE HEAD IS A DYNAMIC BUSINESS, YOU DONT GO THERE AND OPEN EVERYTHING AND ITS DONNE, THATS IS FOR THE IGNORANTS. YOU EVEN TAKE THE RISK OF LOOSING PERFORMANCE IN YOUR ENGINE AND LOOSE RACES. iAM DONNE HERE.

[@pietroarrigoni9186]

The fact many people do it is not at all a warranty. There are so many stupids that do things other tell them to do.Pinocchio story teach a lot about it.

[@rafaellastracom6411]

Have you guys ever considered putting a vane/wing/deflector in the actual flow path right before the valve? I have always wondered if by adjusting the final velocity profile with such devices one might get a little extra by way of better tumbling/mixing.

[@alfredomelodic]

Rafael lastra

[@stakeout2]

Rafael Lastra com I was also thinking the same yesterday, even a weld in a line and sanded like a ramp , would cause a tumble affect

[@eliotmansfield]

I tried just that 40 years ago aged 12 on my dad’s superflow 110 . I made a plastercine curved vane on the back of the valve. Back to back flow tests showed it flowed less. Could of been a millionaire if it worked!

[@plattigus5580]

I've actually hammered a spike with inset marks in my cylinder head the pockets with sharp points won't slow down scavaged air same on the combustion block I don't need a dyno I know it works in principle the ripped turbulance is what I'm after

[@oldschoolman1444]

It's like a golf ball turned inside out. The dimples on a golf ball make it fly further due to less drag.

[@litoaykiu]

Ball also spins that help to archive more distance and accuracy! Smooth will always provide better air flow! Dimples are like refiling in a gun barrel.

[@briancoakley1524]

What a brilliant idea!

[@vengeanceizmine9878]

I see a lot people try to compare this technique to a golf ball.. ok. MAYBE this might work, IF i threw the head off a cliff.. it might travel through the air faster, but won't flow more air through it. The entire premise of doing this, in theory, is for less surface area, creating less resistance. But a golf ball isn't stationary, as it is always spinning. Port dimples are done for the same reason, reduce surface area, to lessen resistance and in theory, the air goes through the port faster. But it doesn't. Most don't know, air through a port builds a boundary layer that surrounds the port floor, walls and roof. That air becomes stagnant somewhat, forcing faster incoming air through the middle of the boundary layer, so it won't even see the dimples. Next, add fuel to the mix, then ask yourself, how good does a dimpled golf ball travel through the air in the rain?

[@stevelindsay3643]

I haven't seen this before. I build Gen 1 sbc mainly 406 ci motors. I gather the reason for this is to help atomize the gas before entering the combustion chamber and I think it would do just that. I see a lot of comments on it causing a build-up of grime from fuel deposits. I don't think that would be the case on the motors I build with the velocity of the fuel going through the runners. This would not be for a daily driver low comp motor with lazy runners. That said on performance heads high octane or adder fuels I can't see that being an issue. It's obviously a slow process. I wonder what the average cost for this is. I'd be willing to give it a try to see what the difference is if any. The better the gas is automized the faster and cleaner it burns, does that equate to more power from this process is the question of its validity.

[@TRX450RVlogger]

MAN! I thought I was the inventor of this!

[@BeamRider100]

I saw a dyno result going from 304 to 320 HP on a NA K series by dimpling. That's huge if there's close racing.

[@boarder11881]

Is this something I could get done to my vehicle or is there a waiting list could I get some feed back please reply.

[@ze_german2921]

I can only see a benefit if the entire intake runner of the manifold is also being treated this way as well

[@rongravel4585]

Lot of guys in the comments with the lack of knowledge to understand the proper applications for this and the reasoning behind it.

[@brandonwytaske9432]

All this talk about fluid flow and boundary layers with no reference to Reynolds numbers.

[@sportsmansparadice42]

So what are the advantages of dimple porting very standard CNC porting?

[@kolten808]

Ok from what I understand is a golf ball has dimples or little aero pockets and Moves in 3 dimensions which is why it can travel farther than a non porous ball. How will this improve when the inside of an engine remains stationary?

[@chrisstratton3430]

The golf ball has the same principles if it stands still and the air flows around - thus the engine - IE air pump.

[@Limou551]

IT DOESNT IMPROVE LIKE THEY SAY

[@jefferybernard4800]

The dots will cause the fuel to puddle in parts of the port and consider turbulence how many nhra use them

[@jimbovoncarguy3877]

Smartest comment on here. There is a reason prostock dont do this. 🤫

[@Zionslayer1]

It is not carbureted.

[@charlesmiller6510]

Isn't this to help atomized fuel from dropping out and pudding up on the intake port walls? It should help carborated engines, no?

[@plattigus5580]

The air in the dimple has to travel further thus faster than the straight thro air ie more distance per unit of time...this theoretically should counteract the friction of the walls...ive used a centre punch in mine as an experiment the very least the faster turbulence created should liven up the fuel air mix

[@BnMGarage]

when you take your eyes out of focus on it. it looks like an OWL LOL

[@MoEzArT_]

Stephen Ayeni you are so right😂😂😂😂

[@nobodyhere4860]

That's a freckin trip! Sure as hell looks like an owl!!!

[@MTBEERWAH]

ha ha ha...yep

[@travisculpepper2091]

LMAO..frfr

[@krap101]

So you get less skin friction but a lot more losses due to vortices... seems more straightforward to polish... might even be more apples to apples if you went to a larger cross-sectional area manifold...

[@White.Elemant]

If this works, we will find this in all F1 engines, right?

[@JRkota318]

Wouldn't this add to the buildup of heat from the turbulence? Also when air goes over the dimpling it'll create a low pressure behind it. Wouldn't the low pressure behind it slow down the scavenging effect?

[@aubreywilson4956]

if you put the tailgate down on a truck you get worse gas milage you loose the bubble of spinning air it's like a ball bearing

[@fast4d1]

Nice for carbon buildup

[@TurboJohn74]

You get buildup on ANY textured surface.... seen it on all but fine polished, which you do not do on intake port anyway. Normal service with intake fogger or spray every 30k miles keeps it in check.

[@Dwarfgrinder]

No carbon on race cars. Ethanol and methanol don't really leave all that much and the intakes stay clean as a dishwasher.

[@anything7441]

I’d like to coat mine with copper chef 👨‍🍳! Or granite stone. Any non stick surface. Maybe a different port shape ?

[@ericthered9655]

They put dimples on a golf ball to pull the air flow around the back and cancel the low pressure area behind the ball. The dimples can be used on a short radius to bend the flow around the turn, but they do cause resistance. Putting them all over is bad science.

[@CHIBA280CRV]

Wow art ! Awesome!

[@alejandroledesma905]

This is just more proof that aliens live among us 😂👌🏼🔥

[@juliog5]

Amigo quanto fica pra fazer esse serviço? no caso é um cabeçote de um vw fusca 1900cc

[@916pickups]

Is this for the purpose of fuel atomization? Or did wet flow testing reveal some sort of flow or velosity gains?

[@916pickups]

Rclyde - fuel atomization definitely needed in intake port. Beyond 80 grit intakes can suffer vapor lock. polished intakes no good. anything past 80 grit in exhaust or chamber is cosmetics.

[@916pickups]

Rclyde - im going to trust what my friend and teacher Joe Mondello taught in class before his passing. I trust him since he is a 5 time Drag Race hall of famer , inventer of the flow bench ( started as a shop vac with stick and string to check turbulence) . Also invented the wet flow bench using glow stick fluid.

[@Limou551]

@@916pickups THERE ARE INJECTORS DIRECTLY IN COMBUSTION CHAMBERS

[@sangetsuichigo7981]

does having a dimple surface or a rough surface will give you more horespower? whats the effect on the engine please explain

[@thatguythatdoesstuff7448]

Dimpling reduces air drag. It's the same reason golf balls are dimpled. Small pockets of air are trapped in the dimples and allow the air to flow past more freely. When you open the ports up like that, you actually reduce velocity, for a given CFM. Dimpling theoretically restores some of that velocity. But, this is a cylinder head off of a turbocharged engine. Dimpling in this application may fall under the law of diminishing returns. I bet it works well on a naturally aspirated engine. A rough surface does not promote air flow.

[@michaelovitch]

Dimpling allow just a more organized airflow. dimples create like you said, zones where air pockets ,as controlled turbulences,create a cushion for the air flow ,called turbulent flow like air rollers. They are supporting the laminar flow,wich travel easier in the middle of the port's section. What is the diminushing return you talk about ? the back flow when valves close ? As i know a fine grain casting rough surface is pretty good for airflow,doing about the same that here in its principle.

[@GentiluomoStraniero]

The dimpling works best with carbureted engines on the intake port downstream from the carburetor. The dimpling creates turbulence on the surface of the port helping keep the atomized fuel from falling out and wetting the port walls. On an fuel injected engine, one can induce turbulence using this technique to increase swirl of airflow as the valve opens. Once would have to used CFD to determine where the dimpling would best benefit the VE% of the engine.

[@stevesolo16]

Then why are showing it on the exhaust side? Besides to keep the fuel charge atomized and keep from turning into droplets against the intake runner wall, all you have to do is give it a slight roughing up with a 220 sandpaper roll instead of going through all of this dimpling nonsense. I have 14 world speed records and a degree in physics. Seriously, this is all smoke and mirrors designed to separate you from your paycheck.

[@GentiluomoStraniero]

Steve, I don't know their rationale for using it on the exhaust side and as an ME, I agree with you on your assessment. My argument is that IF one wanted dimpling nonsense, it would be better suited on the intake side. :) I personally like to blast intake ports with 100 grit aluminum oxide.

[@ImTheDud3]

how much cost to port cylinder heat in this method 6cyl 24valve head ?

[@whitemalerage4231]

phongs transmission knows dimple porting works

[@antonioaaron18]

can you port my motorcycle cylinder head 4 valves only and my bore is 68mm? can i see my parts? I'm from Philippines

[@215alessio]

use dremel :) it's a cool idea and let me know when you finished experiment

[@mindandbodymuscle5345]

I'm more concerned by the turbulence of air this will create. Vacuum is created by the venturi effect. But with dimpling may create turbulant air on the throat of those runners.

[@ryanhoeven7826]

whats with the dimpling? that is done intentionally? if so for what reason? Wouldn't a smooth surface be more efficient?

[@lkkjhtemmexv1838]

NO THIS IS JUST TO TAKE MONEY FROM IDIOTS. IT DOES NOTHING EXCEPT CREATE MORE GUNK THERE. YOU DONT GET MORE POWER WITH THAT I ENSURE YOU

[@Limou551]

REASON, TAKE THE MONEY FROM CUSTOMERS...ONLY THAT.

[@DamienKoda]

dont read morons read all the comment you will understand.

[@epjetta]

Way beyond what i can afford. I will have to make do with hand porting.

[@todddooley793]

Is this only effective of a boosted car?

[@ابوأسامهابواسامه-ز7ض]

What is the price of this device?

[@Trumplican]

I believe in a rough intake port but I don't think this design is effective. Dimples will cause eddies where the air swirls around each dimple. you want a lightly scratched surface from medium grit sand paper with the lines going horizontal of the air flow. A little rougher where there is low air movement to help keep the slower moving mix atomized and a little smoother where the flow is higher and doesn't need as much help staying atomized.

[@stevencorbo1220]

Is there any benefit

[@pabloalessandrini3203]

What program do you use?

[@buckshotgeorge7201]

Yeah might look cool but air flows better over a flat smooth surface. Just simple physics

[@duniafana291]

Its true but why the golf balls is dimpled ?

[@gany_racing5272]

Have anyone thinked how does it work with water flow ? Cavitation ?

[@psk5746]

Do F1 engines do/have this? If not I dont believe it works

[@Jinjenia0]

I believe F1 engines have polished both inlet and exhaust ports. The general idea is that the dimples reduces drag. However F1 need a lot of air because of having much higher RPM, while still retaining a small engine of 1.6L. This means that the size of the ports are limited, and the more flow of a polished port is better. All this is just theorizing though, nobody in the youtube comment section probably have any definitive answers for this.

[@pittpanigale597]

F1 car have better injector

[@peraltamenta]

Ahh, ya lo vi, no me respondas , muchas gracias un saludo Carlos desde Estrasburgo.

[@4g63mark]

I can see where this would be effective on a large port with low velocity.

[@Limou551]

1000 COMMENTS HERE, AND NOBODY UNDERSTAND THE DIMPLE EFECT. GREAT. LET ME TELL YOU IT DOES WORK IN A BALL THAT GOES AT 300 KMSH DOESNT WORK IN AN INTAKE, CAUSE THERE WILL BE NO DIMPLE EFFECT THER,

[@apizjaya3073]

where are you??i'm from MALAYSIA

[@jesuscovarrubias7609]

I literally thought A Fire Beat was gna drop from the beginning of the port Lol

[@williamdickinson2214]

Myth buster confirmed that dimpling reduces wind resistance. Thats why golf balls are dimpled. But those ports look a little more direction in them than regular dimple? Its not theory planes am tge military use this tech

[@Floordford]

I knew this was going to be the next step in power and efficiently. like the surface of a golf ball. but the first problem I see is oil and carbon filling those dimples

[@SquillyMon]

What would Oil or Carbon be doing in your intake tract ? Oil maybe, but that should be in a catch can...carbon no...

[@Floordford]

EGR recycles exhaust gasses through the intake and the valve cover breather feeds crankcase air.

[@SquillyMon]

On a high performance engine being purpose built for racing? Ergo the head port dimpling... Neither should apply there... Only an asswipe would apply this to a street car or keep the EGR or PCV resident in racing.

[@Floordford]

Oh man you're totally right. Who drives a high horsepower car on the street? Who runs race heads on the street? I don't think I've ever seen a +600hp daily driver. Boy, you sure put me in my place....(smh)

[@SquillyMon]

Why shake your head? The logic holds when I re read it... High horsepower is already currently achieved without this mod...thus I was thinking 1000+ hp vehicles would be getting this treatment. Who daily drives those? Few if any. Why would you do this to a high horsepower street car already putting 600+ down right off the showroom floor? Hellcat, Mustang GT500...neither need it. You would tear one of those motors apart to do this? Doubtful...but you would if you were building for 1000+ hp... 600 while awesome...has been done already long ago and without this... I think you're missing the point here.

[@383mazda]

The golf ball analogy is wrong cause it's round and always spinning. A better analogy would be an airplane wing, in this case you'd only need dimples where VG's would be placed on a wing: on the floor of the port as it curves down into the chamber. (If a golf ball didn't spin, you'd only need dimples in a ring shape tangent to its flight path)

[@esataltinbas3236]

in Turkey you have same customer? We are interested "Head Porting Dimpling CNC Rottler P69" , Please send me your catologe and price list for CIF ISTANBUL ...

[@brandonfairbanks5764]

Show a back to back on a ported head and then this process. Flow numbers are ok but it needs to be bolted to a engine and ran back to back. Should that be done and show results, if it's just showing off a piece of machinery then it bullshit.

[@mikaniemelainen347]

Have anyone made the test with the flow bench for that and after that make test for the dyno wery intrest to see the differens

[@faisalSaksono]

Mika Niemeläinen check another his video. there is flowbench tested data

[@Limou551]

IT DOESNT WORK ITS A WASTE OF MONEY AND TIME, ANDPAPER YOUR INTAKE IS BETTER.

[@allryze4me]

WHY????? I AM SO CONFUSED

[@jarnosaarinen4583]

Not sold on it! Nice CNC though!!

[@ericweiss5235]

I don't think the physics are correct here. You have to use energy to cause your gas to accelerate which causes the low pressure. You have the equation backwards. In fact, your theory presumes perpetual motion. The golf ball example is also incorrect. The dimples don't cause the ball to be sucked forward, it causes friction which enables spin, which resists drop due to gravity. Think of a jet. The wings use the Brunelli (sp?) effect to lift the plane, but the thrust is what accelerates it through the air to make this happen. You can't cut power and expect the low pressure to pull the plane. Likewise, a venturi doesn't draw fluid through itself. Rather, the accelerating fluid powers a low pressure area which can draw in only fluid from outside that system. Hope that makes sense.

[@dieselscience]

Bernoulli effect does not lift airplane wings, action-reaction does.

[@JbassPlayer28]

Dyno test numbers?

[@Firion13]

I've read this modification only matters on carbureted engines, or throttle body injected engines... It's supposed to help with fuel atomization... But here's how I look at every kinds of high performance mod... I ask myself... Does Formula 1 do it? If the answer is no, than I don't even entertain the idea on any racing engine.

[@louly3212]

Except if it's actually better than f1 then by all means.

[@louly3212]

F1 sucks *** btw

[@needmetal3221]

All theory without dyno results

[@Didewro]

What is dimpling for? Benefits?

[@juggnautbitch]

+VJ keeps the fuel from pooling in the ports, better fuel atomization.

[@Didewro]

like a golf ball. IC

[@futten3230]

how is the difference in flow?

[@Limou551]

NONE

[@mierollah4994]

turbulence air flow creates higher pressure in combustion chamber

[@Limou551]

THERE ARE BETTER WAYS TO CREATE THAT TURBULENCE.

[@tnrtnr7706]

Sounds like a violin playing one note

[@justinstergar6757]

But why would u do this? More complicated does not mean better.

[@Joeygonzales09]

That's shit works on exhaust I bet but wouldnt do it in intake.but looks awedome.

[@hotrodray6802]

Many comments about gunking up. Ever wonder where the gunk comes from?? Blowby sucked in through the PCV system. Eliminate the PCV and intake tract/ valves stay clean. 👍 Not born last night.

[@nezerac]

GOLF BALLS!! I GET IT NOW!!

[@Limou551]

YOU GET NOTHING, AND INTAKE IS NOT A BALL.

[@MelL773]

Golf ball!

[@pon-zd5iu]

มีคนไทยมาดูคอมเม้นเลยนะครับ

[@WilliamDye-willdye]

"There are Thai people watching the comments". There is also at least one English-speaker who is curious enough to copy text into Google Translate. :-) Greetings to Thai folks, from the U.S.

[@BuildBreakFix]

Still don't get why all the hype is over dimples. They dino tested identical blocks 100s times now and you never see any changes. Like looking for a unicorn it seems. Plus you all know if this really did a damn thing. Every formula 1 car would have dimpled ports. But they dont.....

[@d1gangsta]

this is done to reduce friction of gas I can see a decent power boost from this if u have class restrictions

[@Limou551]

AHAHAHAHAHAHA .. BULLSHIT