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Re: B204L head porting question . . . Posted by John Williams [Email] ![]() ![]() In Reply to: B204L head porting question . . ., Czar, Sat, 20 May 2006 13:07:05 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I recently ported/polihed my exhaust manifold and turbo housings and it helped with earlier spool-up and the biggest part is the smoothness from no boost to boost and back, it really helps to smooth that transision out and make the car's drivability better. Abott Racing claims around 10bhp with a head port/polish job. There are a lot of how toos if you do a google search for port/polish. I think just port matching the exhaust and intake inlet/outlets would help. Then you can do the head where the valves are and smooth out any sharp transitions and smooth out the flow of the areas. There are a couple of pics on Jak's website that show the valve part of the head that has been ported. After having good luck with my port/polish job, I swear my car seems to spool about 300-400rpm eariler now :-) sweet spot was about 3200rpm, its now 2800rpm. I used to hear the turbo start to spool at 2500rpm, I now hear it starting to spool at 2000rpm.
When I go to do my head-gasket and timing chain, I plan to have my head ported/polished and have the deck milled to specs to raise the compression too... I say do it up and good luck,
John
posted by 63.18.100...
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