Port and polish

[hoodedreeper]

Hello,

Been seriously thinking about doing some engine upgrades and thought about getting a port and polish.

Is it worth?

 

[Shaun]

I have no experience, but can imagine it would be a very good idea.

 

[Zagato]

I've heard a coupl of things about this, dunno how true they are:

One is that the "polish" bit is pointless as the boundary layer of a gas is barely moving anyway and a surface would have to be really very rough to reach up through the boundary layer.

Another is that enlarging the inlet port means the air flows into your cylinder with less velocity, and hence momentum, which actually lowers your dynamic compression ratio.

I'm currently doing a fluid dynamics module at uni and the theory seems to support those^^

 

[frank]

there,s a guide/thread posted on here eh :grinning:

http://www.micra.org.uk/threads/32338-My-16v-head-rework-(porting)-guide?

 

[smiffy]

Was just last night thinking off doing this, how hard is it to do, I've done it on a mk3 fiesta.
Would it be just set engine to TDC and then dismantle head.? Would also be buying a haynes manual to help

 

[frank]

Was just last night thinking off doing this, how hard is it to do, I've done it on a mk3 fiesta.
Would it be just set engine to TDC and then dismantle head.? Would also be buying a haynes manual to help

yes, head off and full strip, the ports open up ok (here,s mine, before and after)

 

[sp13rsy]

i have a head in my garage thats been skimmed ported and polished just havent got round to fitting it yet :down: