i just like to no how to get a decent finish and how to do it as i fancy having a go. so i can get more bhp thanks
port and polishing. help
- Thread starter speedy
- Start date
MasterAuron
Very Senior Member
To port and polish a head properly is a big job. That's why it costs £600+ for a proper job on an 8 valve.
Chances are you'll make the flow worse if you have a bash. Maybe just opening up the ports you'll be okay but anything else is risky. Might net you 2bhp if you're lucky.
Chances are you'll make the flow worse if you have a bash. Maybe just opening up the ports you'll be okay but anything else is risky. Might net you 2bhp if you're lucky.
Country Bumpkin
Track Warrior
The ONLY way to properly port heads is with the use or availability of a flow bench. That way it will show where improvements are made or lost. To take on a job of this magnitude with no knowledge is potentially disasterous and as mentioned previously, can possibly make matters worse.
People spend years learning and perfecting the art of porting and tuning to get it precise and spend thousands of pounds on the equipment to do so.
Now, don't let that put you off doing mild tweeks because some things are blatantly obvious, these show up as bad casting marks or lumps or misalignment to the mating component [manifolds; inlet or exhaust] and/or the gasket.
When reading stuff from forums where home enthusiasts have done similar jobs, be extremely cautious as to what information you digest and which bits to discard to the bin of the useless idiot department.
You'd probably be better off buying the proper books, written by professionals and reading them inside out than reading from people who in reality have as much knowledge as you do to start with.
Good luck and have fun but please be careful.
People spend years learning and perfecting the art of porting and tuning to get it precise and spend thousands of pounds on the equipment to do so.
Now, don't let that put you off doing mild tweeks because some things are blatantly obvious, these show up as bad casting marks or lumps or misalignment to the mating component [manifolds; inlet or exhaust] and/or the gasket.
When reading stuff from forums where home enthusiasts have done similar jobs, be extremely cautious as to what information you digest and which bits to discard to the bin of the useless idiot department.
You'd probably be better off buying the proper books, written by professionals and reading them inside out than reading from people who in reality have as much knowledge as you do to start with.
Good luck and have fun but please be careful.
weber44idf
Torque Junkie
the bumpkin has it all summed up , DONT DO IT . read some of the forums they often indicate that the incorrect removal / modification of inlet and outlet tracts upset the harmonic balance in the manifold runners etc ,
As an alternative you can try for a 2 nd hand unit that has ben tried and proven , plus you can usually pickup extras thrown in to the deal
As an alternative you can try for a 2 nd hand unit that has ben tried and proven , plus you can usually pickup extras thrown in to the deal
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