Ported???

[ade]

What is ported?

What does it do?

and if I fitted a ported head to my GSi engine, do I have to change any of ther "bits" (ie pistons, valves etc).

Just curious...

Ade

[dunova]

It just means that ports are drilled in the combustion chamber and inlet of the cylinder head, therefore making it easier for the gases to flow through. You could fit a ported head and not do anything else, but you could also get the head skimmed whilst you're at it. This will increase compression, but if it's skimmed by too much you will have trouble. I think a 2mm skim is considered to be quite a lot.

[jay]

they open up the ports a bit,you have to get your inlet manifold suited to match really as they'll be a bit bigger,they normally polish at the same time to let everything flow quicker with more ease. most people normally go for bigger valves whilst this is being done

[Riggy]

im sure i remeber camb sayin that it better not to polish the inlet ports as it creates less turbulance

[Stuart]

indeed i did :p

look on www.max-boost.co.uk he has a load of links to porting info in the breathing section regarding the LET, but the principles are the same

[ade]

cool.

cheers guys.

The heads been skimmed from what i can gather.

[Nick]

some people highly polish the ports, which is bad. (like a mirror polish, you see this on jap cars alot, because they think it's cool)

a slightly rough port wall rolls the air/fuel mixture as it's passing through, this provides better fuel atomisation and also stops the fuel from dropping out of suspension.

[burgo]

some people highly polish the ports, which is bad. (like a mirror polish, you see this on jap cars alot, because they think it's cool)

a slightly rough port wall rolls the air/fuel mixture as it's passing through, this provides better fuel atomisation and also stops the fuel from dropping out of suspension. actually on the exhaust ports a mirror polish is what you want but just do the inlet ports with 80 grit emery cloth and you'll be fine

[Nick]

well i thought that was self explanitory, as you shouldn't care about any fuel atomisation characteristics in the exhuast ports

[burgo]

well i thought that was self explanitory, as you shouldn't care about any fuel atomisation characteristics in the exhuast portsnot to some people on here

[Nick]

i suppose so