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Strip and wash head check valve guides for clearence cut valve seats+face valves + wash head again+reassemble the head but not including the cam or cams and check valve seats for leaks.Most shops will be + valve stem seals for this job as well because the OEM Honda are the best for this job.Quote:
Originally Posted by michael_antoi
ALLMTR996
at the end of the day, you will get what you pay.
Adrian at Toda Racing (in Sydney) ported my head, and had it sent of to be serviced.
quality of his work was excellent and any heads i need porting in the future will be done by him.
If you are serious, give him a call, he no longer works for Advan so price may vary, it may also depend on how "much" porting you would like done as well, as more porting would be more labour intensive.
thanks for that mate,
out of curiosity how much did u pay for ur p&p?
must of noticed some good gains eh?
i couldnt tell you what the gains were as several other parts of the car were changed at the same time.Quote:
Originally Posted by michael_antoi
to be honest, i can not remember how much it cost to port and polish.
generally, workshops work on $80-$90 an hour in labour....
:rolleyes:Quote:
Originally Posted by blackdc2
Another thing to consider as an addition or alternative to P&P is extrude honing.
When a Head is manufactured, it is cast, meaning that molten aluminium is poured into a mould and set to solidify. Whilst the japanese have great castings, there is still a small amount of rough edges/imperfections within the port chambers.
The extrude honing process involves forcing an abrasive paste through the head to hone the chambers internally.
I havent used it personally but I have heard of great reports on a sprint car. This process can be used on anything, from inlet manifolds, turbo manifolds, turbine components etc etc
They are located at mount druitt and trade under Abrasive Flow Engineering.
i got my head p&pd by Harries Engines in Sydney. They cost around $700, included a full head service(clean/seals), align hone on my cam bearings, valve job, o-rings, and usual porting. Also included porting out the exhaust and intake manifolds.
http://members.optusnet.com.au/loxy/...head/head1.jpg
http://members.optusnet.com.au/loxy/car/turbo/head/ - pics
how do these pnps compare to ones that come standard in Type Rs etc?
Obviously, a p&p Type R head is optimised for the original Type R camshafts, so they flow well. Fit a different spec camshaft tho, to any head and you should have the head p&p to suit.
Any reputable workshop should be able to specify a camshaft for the p&p work they do to your head or alternatively p&p to suit a camshaft you want fitted.
exactly, and extrude hone is a big NO NO for a cylinder head.
how come? as i have a friend that had an extrude hone done on his headQuote:
Originally Posted by ProECU
ok think of it this way.....
when you're passing an abrasive paste through a conduit, how do you know...
a) how much abrasive to pass
b) when to stop
c) how does the abrasive actually abrase the inside wall path
d) how do you define a space that is "optimal" for the flow to travel
e) how do you prevent the abrasive from contacting areas around the valve entries which do not require attention.
In otherwords, how do you control "where" material should be removed from ?
All extrude honing is good for is hogging out volume.
I'm sure your friend has shit torque production out of the motor using that head.