So /o I am essentially a starving artist. I have dedicated years

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>>14105941
Top left d15b intake
Top right d15b exhaust
Bottom right oem Z6 manifold

This one y8 exhaust

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>>14105954
D15b exhaust

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>>14105959
D16y8 Intake

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>>14105964
D16z6

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>>14105968
D15B exhaust

Most people dont give a shit about their cars
Most people that don't give a shit about their cars DEFINITELY dont give a shit about how polished their intake

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>>14105941
D15b nonvtakkkk

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>>14105993
D16a8 Dohc zc eurotrash

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>>14105941
Skunk2 Sohc

>>14105991
Do you understand the point of porting and polishing?

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>>14105941
D16Z6 Square port
>it will nigger on b/k/f/h/j series

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>>14106005
B18 Ls non vtakkkk

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r8 my work op

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>>14105941
D16y8 Manifold

Well thats all im dumping for now going to go beg for some spare change so i can get something to eat

>>14106014
Need closer Pics of the runner my nigga
What grit is your finishing polish/texture

>>14105941
Looks good, op. If I owned a car worth doing this to, I'd hit you up.

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>>14105941
1 more for the road
Oem Tb vs 68mm tb on y8 manifold

Maybe go to car shows and try to drum up business there. Maybe even hit up the ricers and stancefags, they have money to blow on cars.

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>>14106017
i just have a better before
the runners were lumpy internally.
i think it was 80 grit. I used a dynafile.

http://www.directindustry.com/prod/dynabrade-europe/product-8306-449554.html

the little belt sander to get deep in there. i have no idea how other people can reach deep in there. the tool sucks, the belts like to fly off if you push hard

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>>14106050
This is my car
Tipping the scale at 899 lbs currently

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>>14106052
inside the plenium
im not sure what i could do there. its pretty big.
i could have smoothed it with a butterfly tool. i deemed it not needed

>>14106003
i don't, someone tell me

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hr

>>14106068
An internal combustion engine is essentially an air pump. Porting and polishing smooths out the internal walls of the intake and exhaust sides, creating less turbulence, which in turn increases air flow, which means the engine makes more power.

Something like that.

>>14106068
better airflow

>>14106082
polish i think really doesnt do a lot as much as porting
there is the layer of air on the surface that does nothing anyway

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Tools of the trade

>>14106082
>creating less turbulence, which in turn increases air flow,
Turbulence at low engine speeds actually increases hp/tq.

themoreyouknow.jpg

>>14106093
those flap wheels have a short life for me. like one use.

>>14106052
80 Grit will be ok. I prefer 60 grit on the intake side because air has a higher speed/velocity over a rough surface vs a smooth surface. It helps break the boundary layer, like dimples on a golf ball.

Will a car make more power after a port and polish if you stick with the stock ecu or do you pretty much have to go standalone to get the benefits of a port and polish?

>>14106099
look at a golf ball
they work better when they arent smooth. same applies an awful lot air principles

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Oem toyota 20R intake

>>14106099
Correct that is why when i polish Intakes i choose a 60 grit finish, up until the short turn radius and bowl area, i then switch to 120 grit to promote a last minute tumbling effect as it begins to enter the cylinder and promote a better fuel mist suspension

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>>14106121

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>>14106119
After plenum mod and gasket match.

>>14106110
I do almost exclusively work on hondas. There are some gains to be had porting without retuning and chipping the ecu, but the benefits are much greater when dyno and the fuel maps applied accordingly to all the extra air the engine is now breathing

>>14106128
I have done work on some air cooled vw stuff before. Absolute shit engine
Fuck the brz fuck the frs fuck subaru fuck toyota and fuck Porsche. Flat 4 piston slapper piece of shit

Hey man, I might actually have a little bit of an offbeat project for you if you're interested.

I have this little 100cc bike engine that I'm doing a ground up rebuild on. It's from a 1971 Honda CL100. Would you even be interested in doing a 1 intake runner, 1 exhaust runner job on a silly little bike engine head?

What would be a fair price for that, even? It's so small you could probably bang it out in no time at all. Like there's no port dividers, and the "intake manifold" is just a spacer that the carb sits on, so no gasket matching that either.

>>14106129
Bretty Gud

>>14106136
good to know, thanks

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>>14106143
why do you get angry about them
a lot of people call them "simple" i never got how that caught on

>>14106147
Could be down reply with your email and we can go from there

>>14106129
how did you clean up the exterior manifold surface so well? it went from almost black to a nice even aluminum finish

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>>14106158
I own a 67 Baja 55k og miles
Built a 1641 dp dynoed at 78hp 101 ft lbs
Close ratio 1-2 billet super diff 0 miles from rancho trans axle
Never worked on a more rage enducing piece of shit in my life, weird ass hardware sizes 3bond everything. Cant wait to sell it

>>14106188
Bruh That fan shroud is so expensive

>>14106191
whats wrong with it?

im making one eventually
DPR 76mm crank
92mm mahle pistons/jugs
a 009 distributor, from the original engine builder in iowa. (fucking sucks)
a new empi bubble top case
straight cut gears for cam
revmaster CNC ported heads
-65cc chambers
-dual valve springs
-stainless 40x35.5 valves
CB performance intake with single DelOrto DLRA 48 (38mm venturi installed)
Engle FK43 cam
high ratio rockers 1.4:1, Kultect brand
stock con rods, balanced and reworked by builder
stock dual port end castings ported to fit the heads

>>14106174
Hot Tank or media blast. Or let it soak in a bucket of gas. Then spray with mag wheel cleaner and let it sit. The mag wheel cleaner is acidic and will eat the top layer of shit off and leave you a nice manifold

>>14106082
Air flows in a laminar fashion, so polishing doesn't do shit. Just like the dimples on a golf ball, there is a perpetual surface layer of air on the interior surfaces of the intake/exhaust/whatever that doesn't flow.

However, it does look nice.

>>14106136
Do you have a Flowbench? I was considering making a homemade one if I do the beadwork to make sure I have uniform flow and volume.

>>14106202
I saved it from the scrapper (should have let it die) in 2 years of owning it i have driven it 500 miles and it has had 3 engines.
First one had a rod knock when i got it
Second nigger at the part store gave me the wrong fuel pump push rod and mixed oil and gas and grabbed the rear main
3rd has killed 3 different alternator pulleys. Finally fix pulley issue and now the fan hits housing.
Fix housing issue and the trans blows up
(Now new mother fucker edition)
New electric fuel pump
New fuel lines
Rewired entire car
>fucking cursed piece of shit

>>14106214
A use a friends sf-600.

Hey OP, got an idea for you.

Instead of waiting for customers to come to you with parts to do work on, why don't you go to wrecking yards and buy throttle bodies/intake manifolds, then clean them up/do your work.

Aftewards you could sell them on ebay/amazon and the like.

>>14106204
I have a blast cabinet at work, soaked it the parts cleaner at home scrub bed it as best I could and blasted the rest. Used a brush and degreaser to get all the crannies.

>>14106233
I have done that in the past but everyone nigger jews you and you end up sitting on the parts for a long time and being a broke ass nigger my self the overhead of these parts kills me.

>>14106217
why didnt you just rebuild the 2nd one right? sounds like it was an easy fix
crack the case open, mic the crank, check the bearings with plastiguage
fix problems, put it back togehter

>>14106245
The 2nd was rebuilt to perfection but when i bought my new mechanical fuel pump rod the guy at the parts store gsve Me the wrong one. It was too long, pumped way to much gas into the engine washed out the rings and mixed about 8 quarts of fuel into the oil causing the rear main bearing to sieze and rip out the dowel pin and junked my case

>>14106212
But wouldn't evening out and reducing the size of the dimples and peaks how far they stick out from the surface help increase airflow?
I'm not talking about a fine polish, just smoothing out the really rough stuff.
Most guys around here consider that polish.

>>14106268
He is talking about the casting flash. As the air hits the high and low spots of the casting flash the air seperates into 2 directions and creates turbulence. This turbulence too early before the valve results in reduced velocity and lower flow rate

>>14106257
damn

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>>14105941
D series masterrace

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>>14106367
jesus how much money do you have in that beast?

>>14106241

That sucks. Still, I think it's more of a matter of watching what is selling for big money and catering to that demand.

Surely there are niggers with too much money and not enough sense that would pay for a gold coated intake manifold or something.

>>14106380
Including the headers about 500 with the master rebuild kit paid 50$ for entire engine core. I scum and low ball the civic mexicans for days
>>14105954
>>14105964
>>14106049
Head work and manifold work for it.
12.5:1 comp should rip and be very snappy

>>14105964
>>14105959
>>14105954
In every single example, there are deep groves.
You are going in with a Dremel bit and grinding. Try smoothing out the flow boundaries afterward with a minimum of 800 grit wet/dry sandpaper.
If you can get a vaccum system going, you should be able to suck increasingly fine sand (blasting media) through the head.

>>14106100
Look for SiC or Si3N4 grinding wheels.
McMaster Carr, website, has pro stuff.

>>14106105
Golf balls have relatively low velocity.

You need to consider the shear stress induced at the wall to analyze what would be better. Tau=-mu*(dv/dy), the turbulent flow would have a flatter profile across the flow channel with steep gradients at the wall, versus a smooth wall which would have sweeping gradients of velocity.

Also consider the golf ball travels at maybe Mach 0.15 versus air traveling through the head may be at Mach 0.70

>>14106408
They are smooth to the touch the lighting and grooves you see are exaggerated from the instagram filters. 800 grit on the intake side LOL

>>14106424
Radiac Abrasives is my supplier for everything

>>14106455
Run this by me in lay mans terms

Have you done any H-Series intake manifolds OP? I want to get the upper plenum on a H22A ported and polished (webbing cut out for butterfly valves and TB opening for 70mm TB)

Maybe lower plenum too but that was done by the PO. Going on a H23A VTEC (same head as H22A4, P13), currently the IM on there is ported but it doesn't support the right IACV to work with the harness that's in the car. A H22A OBD1 upper plenum bolts up and takes the right IACV.

>>14106480
I have not yet done any h series manifolds. The closest i have done was a factory gsr manifold. The problem you run into with big tbs on factory manifolds is that there is not alot of material between the tb and iacv the y8 manifold i posted shows that. The 68mm tb is only possible on that casting because it was an automatic and would normally have the iacv located on the tb and not the manifold.

>>14106143

https://www.youtube.com/watch?v=JtpzA0hd8Kg

maybe you just suck balls

>>14106520
Aircooled Vws are as bad as flathead fords. Never spent so much money to go so slow in my life

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Dad got this. He considered repairing it but it's too much work so we're parting it out.

>>14106565
Mail me the cylinderhead For free

>>14106581
Too bad he wants to sell the motor complete

>>14106509
Where are you located? The H Series guys could give you extra work if you could port manifolds. It's pretty similar to the GSR Mani, I'd send pics but I'm on my phone. On Hs at least the stock ported manifold is the best option for power up to 260-270whp. Better than a fuck huge skunk2 and expensive K2H RBC.

OP, I'm very interested in your work. Can you tell me about how'd you learn to do this, what tools to use and what not? Im really curious as to how one obtains such profeciency...

>>14106625
Im located in anaheim ca
>>14106693
I just researched online and started doing it. I posted a pic of all of my grinding bits

Check me out on ig badguys_worldwide

>>14106693
I use a 20$ harbor freight air grinder and a giant compressor

Pretty cool OP nice work.
Question: how much aluminum do you ingest?

>>14106763
Oh you.

>>14106756
I looked up your flow bench, it's listed for multiple thousands of dollars. I take it you didn't start off doing this with such expensive machinery. Any alternatives?

Also, 'researched online' is somewhat broad, could I bother you to give a few good sources to start off with?

>>14106780
I dont own the flow bench my friend does and he lets me use it once in a while.
I am dead serious about the 20$ air grinder. What ever head you are looking to port just search diy (your cylinder head) and judt troll all the forums

>>14106780
And not really many cheap alternstives for the flow benches. If it isnt a super flow no one will believe your results

>>14106774
I grind without a mask even when i do cast iron and smoke countless cigs as i go. God help my lungs later in life. Dont be a pussy

>>14106835
>purposely shitting on your health, instead of taking simple, easy and cheap precautions is manly

Then I'll rather be the little girl.

>>14105941
Just being 100% honest with you, I think a general machine shop might have you beat when it comes to what they can provide for the money.

For example I can get a cylinder head hot tanked, ported, polished, painted, and rebuilt with a spec sheet and "warranty" for about 350. These are big I6 heads too. I used to do most of the head work myself but after I did the math for my man hours and materials it's just better for me and my customers to send it to the shop, not some dude down the street.

You need to get hired somewhere your abilities will be appreciated.

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>>14106825
Got that. Although no-one really needs to believe the results besides me.
>>14106819
I've actually got a fancy one of those (pic). At what speed do you suggest running it? I feel like I damage the goods way too quickly on higher speeds, while lower speeds could cause me to bump into things easier.

I also wonder how you get around the corners. My intake for one is quite lengthy, which makes it impossible to work on the inside of the plenum, and the rear side of the runners. Even if I could reach those points, I'd still be unable to see what I'm doing. Do you use an endoscope or something?

Again, got any particular reads or websites I should check out?

>>14106473
Air is travelling too fast for dimples to be effective. A smooth intake runner is better than a rough one in this scenario.
And also because dimples are on golf balls due to the fact that they suffer from flow seperation which leads to a large turbulent wake which creates drag.

Runners should be as smooth as possible to eliminate head loss

>>14106906
This.
And also remember, the engine ingests air via sinusoidal pressure waves and not from a laminar flow.

>>14106906
I also read about possibly greater heat dissipation on the exhaust side when it has dimples. The theory was that the surface will be greater if there's an uneven surface, thus increasing the heat loss. Since you'd want to keep the exhaust gasses as hot as possible traveling out of the system, this accounts for a power loss. Any truth in this, or is it neglegible?

>>14106904
I doubt they are spending the time i am spending on heads. I take about 5 hours per intake and 3 per exhaust port. Not including combustion chamber work. This is on aluminum heads aswell. Any shop in socal hiring Loool

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>>14106905
Basically this. You have to control the tool speed manually with the lever takes some practice

>>14106905
>>14105941
To get way into the plenum you need to cut it open. See bottom right pic in the collage. Tooling with longer shanks help as well

>>14106943
90% of polishing is selling the oohhhh Ahhhhhh bling factor

>>14106991
Thanks I guess, but you aren't really answering the question. Is there truth in this theory?

>>14106927
>the engine ingests air via sinusoidal pressure waves
ah, you're right about that.

>>14106943
I suppose you could do that, but you can gain more from an exhaust with a greater diameter

>>14106050
This is a good advice/tip to consider, OP. Also, I think that's one of the easiest ways to boost your business.

>>14107015
Bigger is not better. Larger diameter usually results in lower air speeds

>>14107015
Well, of course bigger ports would help, but one could do both right?
>>14107027
Depends if the engine's choked by the canals. If the exhaust, intake and cams are uprated, so should the diameter of the ports.

>>14106082
Never knew about polishing this stuff and all but that's a good shot of knowledge there. Thank You, sir.

>>14107015
Oh actually. There might not be truth in the theory.

If the air is flowing fast enough you might get a large boundary layer in the dimples where the air stagnates. So rather than the air following the contours of the pipe and using the maximum amount of surface area, it just skips over the dimples.

>>14107040
Obviously it should be modified accordinly Im trying to prevent people from going in there garage grabbkng the sawzall and cutting a 5 inch diameter hole in the port cuz now dat bitch will flow so much nawm sayin

too lazy to read the whole thread, so this may have already been posted, but incase you arent already, start doin p+p work for quads, dirtbikes, and utvs, the price that big name companys charge for just a single cylinder and head is around 800+ minimum. and these are the kind of people that are consistantly looking for more power. power = money

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>>14106093

Hey, out of curio, why do you use flap wheels instead of abrasive buffs? I'll be doing DIY head work in the near future. Any reading/video recommendations before I attempt my own port & polish?

>>14107113
I use the flap wheels only on the final stage of the bowl blend and short turn radius. The round shape makes it easier to work with vs a cartridge roll. And on the honda stuff the exhaust short turn diameter is about an inch hard to find small enough tooling to get in there and work it

Why are you reshaping the short turn? shouldn't you be shaping only the bowls and the roof?

Have you done dyno runs before and after?

>>14107200
Why? Nigga Have you seen the short turns on a y8? It looks like helen keller was incharge of the castings

>>14107200
Significant gains are to be had on the short turns if you know what you are doing

>>14107261
So post the significant gains

>>14106212
its good for direct injection intake ports and all exhaust ports. also cars with egr. if youre already there and youre not paying for the labor might as well give it a medium polish.

Damn, id love to have something like this done.

I have very unfulfilled dreams of making my car a road eating sleeper.

>>14107200
>>14107281
I'd like to see some dyno runs as well, since that's what this is all for in the end.

If you can prove better numbers compared to somebody else's port job, then you'll be rolling in cash.

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>>14106963
why you not have one of these guys?

>>14107395
you cant use that on a port lol

you need a die grinder with a flex shaft its the only way to get inside them without marring the surface, especially around the valve seats.

Gonna need to see dyno results

>>14106061
Dude ported and polished the whole car.
Now that's ambition.
Or maybe drugs,most likely drugs.

>>14105941
OP donyiu have any experience with GT40 heads for a ford 302?

>>14107416
they are fine on square ports and intakes

>>14107528
yes this.

>>14106073
you're not meant to gasket match the inlet mani, just the exhaust.

>>14106092
AFAIK polished combustion chambers are less prone to premature detonation (knock) as there less carbon build up on polished surface compared to the texture left by casting. However, there is also less surface area to conduct heat away from the combustion chamber. This is relevant for some tuned turbo applications where compression is manipulated. Port matching is IMO the most relevant thing among with the smoothing of the castings. Engines are made rather crudely for DD cars.

>>14108086
why not

>>14108177
no you want to keep the head cool and keep the heat in the chamber. hence ceramic coating

>>14108231
gas reversion, plus the lip acts as a reflector for sound waves (the second point doesn't matter much)

>>14106835
>complains that his business isn't making money
>wastes his money on cigarettes

>>14108259
not if both sides of the gasket are matched you r-tard

>>14106835
>not being fucking retarded is being a pussy
this mindset actually exists.

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>>14108259
its pretty common to port them
people get 7 hp from it

>>14108372
i did the head too, but not the exhaust port. it was the same size as the exhaust gasket

Well, Nobody really wants any head work anymore because you can slap on a 1000 dollar or less turbo kit and double your power.
Bang for buck.

>>14108398
porting is one thing. perfectly gasket matching it is different. that lip is beneficial for low end. outright flow is misleading.

>>14108410
then the headers should be bigger than the exh ports or contain anti reversion lips.

>>14108413
>$1000 or less turbo kit

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>>14108425
they are
you can almost see

>>14106565
>repairing a shitbox

you should have left it alone the second you saw suspension damage

>>14106121
So you're playing engineer. Got it.

>>14105941
Ever done any work on Toyota 4A-GE's? I wouldn't mind getting a head ported and worked on to N2 spec (i.e. what you'd get from Hasselgren).

>>14108467
everyone at that level is playing engineer. actual engine builders do the same thing. they have a basic idea of what they want to fix or change and then test different solutions on a dyno and flow bench.

the dynamics at that level are too small, too variable, and too fast to simply calculate or accurately model using CFD. at least without a super computer and 40 hours spent on making a mesh.

also you dont need rough intake walls in all areas it depends on how the injectors are aimed. and he's right that rough into smooth will promote a tumble since there will be a pressure differential there

>>14108547
Where's your proof and documents to back it up?

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>>14108693
here

>>14108703
Where's your peer reviewed studies? Oh that's right, you have none. Sounds like you're just a tin foil hat conspiritard to me.

>>14108693
ive worked in a machine shop that built race engines. i didn't build them, but ive been around the people that do. they do all kinds of weird shit for which you wont find much documentation or explanation. its all theories. like crazy looking anti reversion headers. do they work? dunno.

as far as the tumble a smaller high velocity area with a larger boundary layer moving into a larger low velocity area with a smaller boundary area will produce a pressure differential and promote tumbling.

thats the hypothesis, whether it works or not who knows? i dont and neither will you without a very expensive computer and a very intricate mesh and all the other random variables that you can think of to pack into your simulation.

do you have a problem with fun and creativity?

>>14107966
One of the first sets of heads i did was a set of gt40x for my sbf

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>>14108432
Ebay everything except a name brand turbo

Cast manifold obviously.

Turbo kit for my B18 cost me like 400 bucks.
And that's garrett t3 and a drag gen 3 manifold.


DSM injectors for 50 bucks, chip the ECU for another 20 bucks. IC and piping for 75

Honda shit is cheap.

Don't own anymore hondas tho.

>>14108547
>actual engine builders do the same thing
Not any worth shit.

>>14108793
You're wrong though.

>>14108800
I'm not. You won't catch anyone who's legit doing dumb shit 'because I think it'll work!'

>>14108810

He didn't say they're doing dumb shit, he said they have a basic idea of what they want to do, then they test varying parameters until they get what they want.

Welcome to R&D.

I was working at a damn once, turbine worth millions of dollars with a ton of R&D going into it, guess what.

Huge harmonic vibrations in the stay vanes,
So they spend a month grinding and shaping them to a different profile. Slightly better but still there, another month of grinding and finally acceptable.


All the R&D in the world doesn't account for every real world condition.

>>14108793
define good.

F1 and LMP teams? because they're the only ones with access to the technology required to model things like this.
and they aren't gonna give you their documents either.

>>14108839
Im glad this turned into
>op You do port work? Why dont you have $1,000,000,000,000 worth of computer models and simulations
>your shit must not work

>>14108784
You're fucking stupid if you don't think a better flowing head isn't going to make more power on a Turbo car on top of giving quicker spool times/better response.

>>14109001
he was just saying most people want maximum bang per buck

>>14108810
if "dumb shit" is the error part of trial and error then yes people still do it and it still does what it always did.

>>14105941

What kind of artist?

>>14109312
Starving cylinder head / manifold porter

>>14109317
Bump for general cylinder head knowledge

bbrbrraaaaaaaa baaawwww
https://www.youtube.com/watch?v=s0HR95rRbyA

File: IMG_20151118_184245.jpg (2MB, 2048x2048px) Image search: [Google]

2MB, 2048x2048px

What do yall niggas think of my ghetto baller header set up
Sohc honda

>>14106099
Not really.
I think you have mis understood or mixed up some concepts.

Turbulence in intake ports is not a good, it wastes energy that could be used to flow more air into the engine.

Induced mixture motion, such as swirl and tumble, can help disperse the mixture in the cylinder which is a good.

>>14108467
If you think engineers aren't playing at being engineers then you are dumb.

When I worked at an engineering company where we were developing the intake ports (they called it the combustion system) for the new Jaguar Landrover GDI engines.

The early development was a box that different 3D printed port shapes could be plugged into to allow us to test the port shape on the flow bench.
We tested for swirl and tumble number with a tippleman flow rectifier.

We didn't have a large CFD team working on the project. It was just one technical specialist drawing port shapes and one engineer planning tests and analysing data. I was the chump doing the flow testing.

Engines aren't black and white. Else everyone would be running the exact same configuration.

>>14108547
On a carbed engine you want things rough.

Where are you located OP?