Doing a port and polish Yourself

2nd February 2007, 11:00

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

2nd February 2007, 11:59

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/litera...05.06B_MED.pdf

2nd February 2007, 12:07

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

2nd February 2007, 12:40

Quote:

Originally Posted by mrorange2

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

2nd February 2007, 13:06

Quote:

Originally Posted by saunders

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

2nd February 2007, 13:25

2nd February 2007, 14:15

can do heads too!

i did my own and my figures are good!

2nd February 2007, 14:57

Quote:

Originally Posted by spencer_cammedvts

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!!!

2nd February 2007, 17:00

pm sent mate

2nd February 2007, 17:52

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

2nd February 2007, 17:52

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

3rd February 2007, 07:37

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!

3rd February 2007, 12:40

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.

3rd February 2007, 13:39

Quote:

Originally Posted by Mystic

Thats throttle bodies

throttle body!

throttle bodies are different

3rd February 2007, 17:38

Quote:

Originally Posted by GOD106GTI

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.

3rd February 2007, 17:44

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

3rd February 2007, 17:50

Quote:

Originally Posted by Itsafastworld85

throttle body!

throttle bodies are different

plural though, hes done more than one

3rd February 2007, 18:12

Quote:

Originally Posted by Mystic

plural though, hes done more than one

doesnt sell 'throttle bodies' though

only real men have throttle bodies

3rd February 2007, 18:16

craig how much are you after for your spare head

3rd February 2007, 19:15

Quote:

Originally Posted by spencer_cammedvts

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.

3rd February 2007, 19:17

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

)

3rd February 2007, 19:23

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

dave you need 50 posts to edit

3rd February 2007, 19:28

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...

3rd February 2007, 19:32

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

3rd February 2007, 19:33

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

3rd February 2007, 19:48

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

3rd February 2007, 19:51

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

haha ryANAL

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

3rd February 2007, 20:03

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

3rd February 2007, 20:09

HAHA georges engine will never get done!!

Will do ryANAL

Well i bet ians is good!!!

3rd February 2007, 20:13

Quote:

Originally Posted by bullit

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

3rd February 2007, 20:17

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

3rd February 2007, 20:21

Quote:

Originally Posted by 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

lol cunt

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.

3rd February 2007, 20:26

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?

3rd February 2007, 20:29

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.

3rd February 2007, 20:32

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

3rd February 2007, 20:34

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

3rd February 2007, 20:37

Dont worry mate my lips are sealed!!

3rd February 2007, 20:46

good shit...

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

4th February 2007, 16:01

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?

4th February 2007, 23:41

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...

5th February 2007, 09:25

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!

5th February 2007, 10:46

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

Now, let's all be friends

5th February 2007, 11:07

how much did the flow bench cost ya ?

5th February 2007, 11:21

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

5th February 2007, 23:32

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

5th February 2007, 23:33

Quote:

Originally Posted by CampDavid

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!

6th February 2007, 15:18

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

6th February 2007, 18:41

5-600 quid on average.

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