gas flowing

15th December 2005, 21:03

i no this may make me sound thick but whats the difference between a port and polish and gas flowing.
i no that when you get your head ported and polished you make the ports bigger and polish them totally but what does gas flowing do?

15th December 2005, 21:21

flows a gas through it to get optimum port shape/spacing etc.

15th December 2005, 21:22

its alright enlarging and polishing but if you dont gas flow it you dont know if the gas flows faster or better or more, which is whats its all about init

15th December 2005, 21:45

any idea how much it would cot to get my head gas flowed?
can get the port and polish done but mite as well have it flowed as well!

16th December 2005, 06:30

I think my mate scott paid between £200-300 for it.

16th December 2005, 14:43

WHAT! thats a bit steep! think il just stick to the port and polish for the time being should go nicely with my cam when i get it fitted.
with the cam and the headwork will i need to change any of the settings on my NOS?

16th December 2005, 14:50

that includes the port and polish, they put the gas through, see where the restrictions are and remove the metal to get the gas flowing better, I would always go for gas flowing over just a port and polish as with a port and polish you might actually loose power as they dont test to see if its any better, they just bore and smooth the hole out, but hey its your money.

16th December 2005, 15:24

i see where your coming from ratty .its just that i can get the port a nd polish done 4 50quid and hel fit my cam kit for an extra £40.he's a good friend and im pretty sure hes not got the equiptment 4 gas flowing.it would just ruin the fact i got a bargain. unless i got it flowed etc and then gave it him to fit the cam! what you think matey?

16th December 2005, 16:46

like I said mate its your money, but the whole point of getting headwork is to get more air in so you can burn more fuel to make more power and compliment cams etc, you cannot guarentee that you will get MORE air in by just a port and polish as you dont know where the restrictions are or where it would benefit and how much to remove, infact that sort of route you will probably loose as you could remove metal from an area you shouldnt (there are only 3 places you need to remove metal from on a 16v and 2 on an 8v) removing too much or not enough or changing the shape of the area etc can rob you of power as you loose the scavenging effect required to pull the air round the bend into the combustion chamber. Like wise polishing too much (the area should really be a matt finish not smooth) can stop the air movement also.

If he hasnt got a flow bench (which i doubt he will) then id not do it and save up for the work to be done properly.

read the guides and info on http://www.pumaracing.co.uk/ as there is some quite good info, it applies to mainly 205 gti stuff but its all applicable here.

16th December 2005, 16:49

or he could break your head and render it useless and then you will have to buy a new one and all gaskets etc to put it right, moto do it right first time rather than fix it later.

19th December 2005, 13:40

hell be takin it to his mercades f1 garage as he works as one of kimi's engine mechanics so im sure hel have all the right equiptment.
his names Darren Thorpe if by any chance you have heard of him!

19th December 2005, 13:47

nope

19th December 2005, 14:46

LOL