port and polish

[hillies]

wad are the the advantages and disadvantages of port and polish?
i) Carbureator Vehicle
ii) Fuel Injection
THx!~~

 

[SkYwAlKeR]

improve performance

 

[Northiswara]

0-100km/h in shorter time.
naik bukit easier.
press sikit accelerator car already can fly.
easy to get wheel spin.
for carb, after port and polish u just hantam in weber. very nice.

 

[jinkl]

0-100km/h in shorter time.
naik bukit easier.
press sikit accelerator car already can fly.
easy to get wheel spin.
for carb, after port and polish u just hantam in weber. very nice.

do not give false hope to him la bro
port and polish promises more performance
but it never ever promises wheel spin , huge gains and such
so many factors more
port & polish gives better and higher flow of air ,

 

[xinghonh]

if its done wrongly....there goes ur engine

 

[jaynian]

so, how much it cos normally? i also wan to do..
where can it be done?

 

[iz282]

0-100km/h in shorter time.
naik bukit easier.
press sikit accelerator car already can fly.
easy to get wheel spin.
for carb, after port and polish u just hantam in weber. very nice.

0-100km/h in shorter time..? WoW..! :stoned:

naik bukit easier...? What kind of buKit bro.....

press sikit accelerator car already can fly....? Wallaa.....

easy to get wheel spin...?

hantam WeBeR...? hehehehee.....

 

[SkYwAlKeR]

so, how much it cos normally? i also wan to do..
where can it be done?

price ranges from rm300 to rm1500...

if its done wrongly....there goes ur engine

noler... jz need to find another cylinder head can adi....

 

[Darth]

straight to the point....it improves ur air flow inside the head..thus improve performance....
this is my experienced....for efi and carb the porting n polish style were diffrent....for carb cant be done same like for EFI.

 

[SkYwAlKeR]

straight to the point....it improves ur air flow inside the head..thus improve performance....
this is my experienced....for efi and carb the porting n polish style were diffrent....for carb cant be done same like for EFI.

exhaust can be same... but intake is different...

for carbie, intake lubang must not be polished till mirror finish... must have minor rough edges to allow air and fuel mix together properly prior entering into combustion chamber...

as for fuel injection, fuel is squirted by injectors in a form of mist/spray.... hence, it can be easily mixed together with air to have a better combustion...

 

[D-IV]

How do you know you are gaining better air flow when sending the head for port and polishing?

 

[jaynian]

after that need to update intake n exhaust bo??

 

[SkYwAlKeR]

How do you know you are gaining better air flow when sending the head for port and polishing?

by doing flow bench testing...

after that need to update intake n exhaust bo??

update??... u think software meh??...

need upgrade or not depend on u lor... if u want more power den upgrade lor...

 

[D-IV]

If they have a flow bench test before and after porting and polishing, that'll be great. Not that i don't know about flow benching, just wanna make sure only. Its ridiculous to send the head for headworks without supporting evidence of any gains.:stupid:

Anyway, intake port needs to have some rough edges so that air velocity becomes slightly turbulent and increased air velocity to allow proper air fuel mixture but that also depends on how you design the bowl and throat angle as well.

Exhaust port needs to be polished so that hot air is expelled faster as the polished surface reduces chances of soot deposits ( it won't stay polished after a few km but atleast its better than OEM). And might as well polished the combustion chamber to mirror finish so you are more knock resistance and changed to JE forged piston.

In addition, you'll need to port match the exhaust manifold and intake manifold to the ported head.

 

[SkYwAlKeR]

intake pnp should look like this...

http://img34.picoodle.com/img/img34/4/6/22/f_portpolishm_443d4c4.jpg

exhaust should look like this...

http://img33.picoodle.com/img/img33/4/6/22/f_pnpintakepom_7ace4f4.jpg

 

[D-IV]

Any reason why they didn't work on the valve guide on the intake port and cut the whole valve guide on the exhaust port?

 

[Northiswara]

do not give false hope to him la bro
port and polish promises more performance
but it never ever promises wheel spin , huge gains and such
so many factors more
port & polish gives better and higher flow of air ,

it happens to me.

 

[Northiswara]

0-100km/h in shorter time..? WoW..! :stoned:

naik bukit easier...? What kind of buKit bro.....

press sikit accelerator car already can fly....? Wallaa.....

easy to get wheel spin...?

hantam WeBeR...? hehehehee.....

wat kind of bukit? behing my house got a bukit. that bukit lor. haha..........

then u will also notice that ur fuel gauge very cepat goto E. haha..........

 

[SkYwAlKeR]

Any reason why they didn't work on the valve guide on the intake port and cut the whole valve guide on the exhaust port?

i think the mech havent install back the exhaust valve guide la...

 

[D-IV]

Ye ke? haha. I did talk to some porting guys in some shops that they normally cut the valve guides thinking that flow will be much better that way. I do insist on having the valve guide on and porting the valve guide side to smoothen it out only slightly.

Anyone can verify that cutting out the valve guides will improve the air flow?