Doing a port and polish Yourself

[mrorange2]

Right been looking in to doing this myself as dont have the cash to get it done by a pro. I'm going to get a spare 16V head do i can do it to take so if i mess up i've still got a running car lol. Seen on demon tweeks a kit for porting for around £45 and was wonderign if anyone has done it thereselfs and was it easy to do? Any tips on it and do you do the inlet and exhaust ports? How do you polish it?

Cheers

[stevenet15]

if port and polishing is not done correctly u can lose bhp, when u send it to a company to do it they check tho airflow through each port, then inlarge all ports and match the new flow rates of each ports so the air flow in each is matched as if there not one may flow quicker then others making one run different etc... also you cant just start taking any metal off anywhere in the port as the ports also make the air swirl as it enters the combustion chaimber thus making the air mix with the fuel better which gives a better bang. so like i say u can do more damage then good if you dont know what your doing as its not just like polishing and porting a simple stright peice throttle body like some people do on here

however here is a good pdf file that explains how u can do it yourself

http://www.sa-motorsports.com/literatures/Porting_12.05.06B_MED.pdf

[mrorange2]

Cheers for the PDF mate will make some good readin while sat at work board like i am at min lol.

[saunders]

Cheers for the PDF mate will make some good readin while sat at work board like i am at min lol.

there is a guy on her that offers a port n polish service for cheap mate, have a look in the for sale section

[Mystic]

there is a guy on her that offers a port n polish service for cheap mate, have a look in the for sale section

Thats throttle bodies ;)

[saunders]

:oops:

[spencer_cammedvts]

can do heads too! ;) i did my own and my figures are good!

[mrorange2]

can do heads too! ;) i did my own and my figures are good!

Spencer i was going to ask you as remember reading you did your own pm me a price!!!

[spencer_cammedvts]

pm sent mate

[Cupra-Craig]

dont do it as said u will loss power. Unless running big power the standard head is good enough mate

[Cupra-Craig]

But if u still wanna do it i have a vts head spare for sale??

[spencer_cammedvts]

mate you just shot yourself in the foot!

it helps more with higher lift cams. not so much duration. thats why people tend to say that "you benefit from it more with catcams that its rival bp285, pt51 etc....

it made a difference for me!

[Cupra-Craig]

No i havent shot my self in the foot ask any good tuner about head work on these engine an they'l tell u the same that the standard head flows great. An if doing it at home how are u going to get the same flow rate etc in every port??

An like i said i no your not going to agree so i make as well sell him my spare head an get my money back for it.

[Ryan]

Thats throttle bodies ;)

throttle body!

throttle bodies are different :P

[spencer_cammedvts]

No i havent shot my self in the foot ask any good tuner about head work on these engine an they'l tell u the same that the standard head flows great. An if doing it at home how are u going to get the same flow rate etc in every port??

An like i said i no your not going to agree so i make as well sell him my spare head an get my money back for it.

what was the point in porting your big valve head then?

and the way you make sure they are flowing the same is by firstly smoothing them out then making sure you enlarge each port by the same amout using internal calipers to measure the diameter of each port virtically, horizontally and at 45degrees also. the main area is the external radius that the air follows when sucked into the barrels.

[Cupra-Craig]

Because mine is a large tuned N/A car mate thats why. U talk shit an thats all i can say

[Mystic]

throttle body!

throttle bodies are different :P

plural though, hes done more than one :)

[Ryan]

plural though, hes done more than one :)

doesnt sell 'throttle bodies' though :P

only real men have throttle bodies :clapping: ;)

[bullit]

craig how much are you after for your spare head

[turbo_dave]

what was the point in porting your big valve head then?

and the way you make sure they are flowing the same is by firstly smoothing them out then making sure you enlarge each port by the same amout using internal calipers to measure the diameter of each port virtically, horizontally and at 45degrees also. the main area is the external radius that the air follows when sucked into the barrels.

That is in no way sufficient whatsoever.

The smallest ammount of material in fractionally the wrong place will ruin a ports flow chracteristics. Are you taking many hundreds of measurements to ensure you are not doing this?

Sorry to say it, but I've been around in this game far too long to ever trust a dremmel special outfit that doesn't have a flow bench.

Whilst this is not simply a yes/no argument (i.e. I'm right, you're wrong), as even a dremel special will flow more air and make more power than stock *to an extent and under certain circumstances*, you seem to be negating the fact that not flow testing a head will ensure that each cylinder receives differing ammounts of air and thus will produce a different AFR after burn, probably leading to a holed piston if the engine is FI, or just simply being a pig to drive and tune NA.

As for lift-v-duration, that's why any good porter will ask what cams you're going to run and what your goals for the engine are.

I have a healthy mistrust for people who can walk up to a rack of heads and produce a "stage 5 full race" head without any prior knowledge of the destination engines spec.

[turbo_dave]

EDIT: (why is there no edit function on this forum?)

Almost as much of a mistrust as people who claim they "polish" heads. Grrrrr.

(and for anyone who wishes to jump in on that - you can polish the exhaust side, but not the intake side ;) )

[bullit]

making notes, thats exhaust side, and thats jotted down. :)

dave you need 50 posts to edit

[turbo_dave]

Aha, well, at least it helps me get there ;)

Whilst you're making notes, don't forget that it's poor practice on a road engine to cut down the heatsinks on the exhaust side too as it shortens stem seal life...

;)

[Cupra-Craig]

Well i rest my case. I told qep wat i wanted out of my engine then we went from there. how i wanted the power i had to have custom cams too

[Ryan]

i still want to know the duration of the cams your running with hydro lifters... as i need to upgrade mine at somepiont, if needbe ill have to go the mans way and go solids :P

[Cupra-Craig]

Ha ha it is a mans way but ran out of dollars!!! Plus dont think they would be too good on a daily drive my cams are bad enough!!

I'l find the spec out for u ryanal!!!!!!!!!!!!!!!!!1

[Ryan]

lol ians 807s or what he has seem to be interesting on daily driving lol!

haha ryANAL :P

coolio drop me a pm dude if you want to keep it all silent.

[bullit]

about time you got your engine sorted. start calling you george soon ;)

[Cupra-Craig]

HAHA georges engine will never get done!!

Will do ryANAL

Well i bet ians is good!!!

[Ryan]

about time you got your engine sorted. start calling you george soon ;)

my engine is in a car... unlike georges.

the wiring is cunt though.
its a mixture of a bout 4 car looms lol! 3plug saxo doesnt like singe plug cars :(

and the whole car is being rebuilt, i had to grind the bloody surface rust off the cage yday lol...

how the hell does everyone know what engine im running anyway :P

[bullit]

lol. i dont think many on here do. get a progress thread going, you know you want to. show how a saxo properly tuned. you can teach others

craig ill get back to you on a price and what i want

[Ryan]

lol. i dont think many on here do. get a progress thread going, you know you want to. show how a saxo properly tuned. you can teach others

craig ill get back to you on a price and what i want

lol cunt :P how does everyone know!!!

im starting writing a story of the car etc... it will be released when the car has been tested and is being used. as i dont want to end up with egg on face if it doent get done properly etc...

and if i post it on here ssc will all find out..

the engine spec im not happy with as you can tell, but all in i think its more important to get the current block running and driven before i think about running forgies and really lairy cams.

[bullit]

no one does know, lol. ive got a good memory, i remember the pugsport cams not producing a great deal, figue wise anyway so you wanting them changed.

how long do you think before its going?

[Ryan]

well it still ran 157.2 bhp. but the drivablity seemed to be the key on track, so going to try it with the cup car cams initially.
i wouldnt change them until i decide what im doing with head and compression etc... and if i can justify another 2k for 10-20bhp...

erm cant really say.. target was the ssc wales track day, but i now cant make that so its not such a rush. mankee is rebuilding my s1 box for the quaife in the next few weeks i think, need to get cage in, and wiring sorted. theoretically it could be running in a month or two, but it will not be tidy, the bumpers are not painted etc.....

we shall see. ill let ppl know when its done though lol.

[Cupra-Craig]

Hrmm ryanal i no wat it is!!! or some of it!! ALEX

[Ryan]

you know what the gearbox is.... the rest even if you guess please do so via pm! ive tried hard to keep it silent lol

[Cupra-Craig]

Dont worry mate my lips are sealed!!

[Ryan]

good shit...

i think we need a photoshoot for all the power cars NA when theyre done :P

[spencer_cammedvts]

all i can say is what i did worked for me! as wayne at chipwizards said it was the best power he had ever seen off 708's without throttlebodies or forced induction!

firgures speak for themselves. i know its not gonna be as good as experts can get it but im not after expert money! not even 1/4 of what you would pay a company.

who said anything about a stage 5 head?

[turbo_dave]

That was my example.

I'll let age and mileage speak for itself. I still have a cracked CVH head with thee valves embedded into the chamber face edge first that was caused because has one inlet port and one chamber bigger than all the others...

[spencer_cammedvts]

look i dont want an arguement mate. id rather we all got on!

they must have been quite a bit of difference in size for it to that though? look im not a cowboy that doesnt know a thing about engines. i know what im doing, i know what should and shouldnt be there and i know how much is safe to take off! and im also confident that i can keep them the same size to a certain degree! i wouldnt have done my own engine let alone anyone elses if i hadnt got a clue!

[turbo_dave]

I never said I was looking for an argument either. Never said you were a cowboy either come to that fact...

I do stand by the fact that small differences to the amounts and locations of material taken out of the part equate to vast differences in flow and swirl rates. That's why I invested in a flow bench :y:

Now, let's all be friends :hug:

[spencer_cammedvts]

how much did the flow bench cost ya ?

[CampDavid]

I agree with Turbo_Dave on this one. Especially as he has a non-EVO M3, which I like greatly.

[turbo_dave]

£600 - it was a DIY jobber. You buy the manometer and the datalogging software and build the actual bench and mounts/orrifices yourself.

[turbo_dave]

I agree with Turbo_Dave on this one. Especially as he has a non-EVO M3, which I like greatly.

Don't forget Mable the Mondeo! She needs loving too!

[mad_dog]

so how much for a 'pro' to do it then?

[turbo_dave]

5-600 quid on average.

Depends what work is done and whether bigger valves are fitted.