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Port and Polish?

5971 Views 25 Replies 8 Participants Last post by  joeleganss
Sorry its so late, and im so tired, and i want a response hopefully soon, but i dont want to research anything right now. Sorry for my lazyness

What does a port and polish consist of? How is it performed? What tools are used? Im not going to get into pnp hardcore but I think since this is a crx club kinda thing that at least one of you should have the knowledge.

LMK im interested. but im too lazy to research myself. (its 3am here in china)
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Basicaly with P&P you are opening up the size of the ports and smoothing them out or adding your own texture to the ports. . . . . the basic metod of it is gasket matching where you basically are just shaping the port weather it be an intake or exhaust to match the gasket and the part that connects to it. . . . . .basicaly say that you are doing your intake manifold.. . . you would match the intake and the head to the same size so that there was less obstruction. . ..
wilder porting and polishing jobs consist of hogging out the size of the port to a larger size and making the port cleaner looking the most common tool used for the hobbist is the dremel tool with a variety of carbide cutter bits. and sanding wheels and polishing wheels..

this procedure is usually best left to someone that does this sort of thing all of the time as you can make things alot worse if you do not know what you are doing. . . .

Serious porters will take say for example a honda intake and cut it in half so that they can reach every nook and cranny and then when all of the porting is done they will weld it back together. . . . . . .thats hard care !!!:):):)

other tools are used...... . this is just my 2 cents worth. . ..

might want to look into a service called extrude hone. . . . . . . basically they blow some sort of abrasive media through the part and the media cleanes and opens up the ports. . .
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I knew the first part, my curiosity is more of how-to and what the procedure is. So tools are called carbides?

I know what a pnp is but I want to know how they go about it, ebcause you cant stick a dremel with a bit on the end and hack away.
Well here at my work we use a makita tool similar looking to the dremel.
It basically functions the same way.
A carbide wheel or roll is threaded onto an arbor and removes aluminum.
You basically use a finer grit carbide to "finish" grind the ports.
You dont want a glass smooth finish on the runners,just a small rough finish.
Hope that helps...
I have more questions for you ollie!

Is there a certain guide or way to pnp? Or do you just kind of go on your own guidance and just go up and down? What kind of procedure is there for porting? To you need a certain pattern that you follow or is it just do it till its to the correct size?
Let me start by saying I'm not a expert with a carbide burr,but from what I have learned and watched there is no set way to do this.
It seems(from what I have watched)that some follow a pattern left to right some are a lil here a lil there.
I have ported a little on a 1.6l ford head.
I personally mark the head with a laundry style marker and use the marks as a kind of guideline.From there I just try to round and radius and remove any sharp corners and lumps.
I have no experience with extrudehone,but am intrigued at the process.
i will have to read up on that one sometime.
I dont know if that helped,but you kinda get the idea.
If you go too deep you will expose the valves... and you basically have to chuck out the head. Best to take little bits off at a time and not rush it. My dad claims my uncle is an expert at PnP and everything to do with the top-end of a car... too bad he lives in Europe :(
Thanks for the info everyone the info helps!

Isnt it true that you can get bigger valves for a big bore port?

Are there places that teach how to pnp? Automotive colleges teach it?

Also what about 3 angle vavle jobs? How are those done?

edit: im being a big postwhore, if anyone has some good info sites to shut me up, please post lol. Even though all your info is helping!
Thats it a pretty amazing process and must be neat to watch. Seems like it would be a good way to get a nice clean up instead of a dremel to a cyl head.
I'm interested to hear about 3-angle valve jobs too. What is it, how's it done?
crxfisher said:
I'm interested to hear about 3-angle valve jobs too. What is it, how's it done?
Ok Im not a machinist,but from what I remember my guy here that does my cylinder head work kinda explained it for me.

angle 1=15 degrees
angle 2=45 degrees
angle 3=60 degrees
These are the norm,although some can grind any angles you can dream up.
It has to do with the proper seating and sealing of the valve.

Picture a3(angle3) starting from the face of the valve and going towards the stem the 60 would be the first angle then a2 at 45 degree then a1 at the 15.
I will ask my machinist what the actual significance of the angles are again...
lol I know he's gonna roll his eyes..I'm always good for a hour long Q and A session. lol
i personally wouldnt get any headwork done except by a professional that knows and works with hondas on a regular basis, if you dont know what you are doing you can make things worse. that being said my head is getting shipped to CA for portwork done by portflow. they will take it apart, clean it, port it, do a valve job, resurface it, reassemble and ship it back, for the cheap price of 900, lol. its steep, but worth it in the long run. this way im assure a top notch port job by one of the best in the business.
Thats way too steep for me. I would only pay something like that for race work and I was serious about getting it done strictly to race on a course.

I would like to educate myself enough to do the work myself, but of course I can mess things up hence why im beginning my education with a friendly post to my favorite community :D I think later on ill be able to do it after a loooooooong time of research.

Yet knowing is the first step.

Ollie, thank you for the info on the 3 angle valve job. If you can get more info thad be awesome.

I wonder how many people will bash me for stating my intention is to perform a port and polish one day :lol:
Ont he topic of P N P I am putting together a b18 at the moment. . .
I broke out the dremel and am just " gasket matching " the ports probably the most basic form of PNP but every little bit helps. . . Basically i am not removing much just kinda mating the intake intake gasket and the head together with a nice port for air and fuel to flow through with out one item obstructing the other. .
i agree, its expensive, but you have to think about the amount of time that goes into quality headwork. portflow charges 100/hour, and im sure they heads get more then 9 hours of work in it so it really isnt that bad as far as price.

also, a good valve job, will actualy provide more flow then the pnp itself. and portflow has one of the best machines that money can buy to do valve jobs.

like i said, id ony get headwork done by a real professional who knows hondas. Portflow, RLZ, Endyn, and Alaniz, are among the best.
just an update just in case anyone cared. portflow is done with my head and will be shipping it back to me tomorrow. i cant wait :)
Congrats! Let us know how it turns out.
crxfisher said:
Congrats! Let us know how it turns out.
here it is. a month of waiting was totally worth it :)

i got the full package from portflow. the head already had portflow springs and retainers.

what it includes:
disassemble/ clean/ inspection
port & polish
multi-angle valve job
deshroud valve area in chamber
polish chambers
surface deck
assembly / new seals included
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*DROOLS* WOW! How much did that end up costing you in the end?
So I'm assuming from your avatar name, this is a GSR head? That looks absolutely amazing!
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