port and polish

hillies

Active Member
Senior Member
Jul 23, 2007
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wad are the the advantages and disadvantages of port and polish?
i) Carbureator Vehicle
ii) Fuel Injection
THx!~~
 

Northiswara

2,000 RPM
Senior Member
Dec 21, 2005
2,589
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1,638
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

4,000 RPM
Senior Member
May 22, 2004
4,624
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Kuala Lumpur
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 ,
 

iz282

4,000 RPM
Senior Member
Apr 6, 2007
4,966
18
1,638
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..... :biggrin:

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

easy to get wheel spin...? :rofl:

hantam WeBeR...? hehehehee.....
:tee:
 
Last edited:

Darth

Known Member
Senior Member
May 10, 2005
368
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Selangor
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

Over 10,000 RPM!
Senior Member
Mar 12, 2005
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Visit site
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

Known Member
Senior Member
Mar 11, 2006
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How do you know you are gaining better air flow when sending the head for port and polishing?
 

D-IV

Known Member
Senior Member
Mar 11, 2006
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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.
 
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