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Old 03-11-2007, 12:16 AM   #1
Scooby Specialist
Member#: 73197
Join Date: Oct 2004
Chapter/Region: International
Location: Hong Kong
Default port and polish question and doubts

today i was helping my friend with his uppipe leak. we basically took out the downpipe, turbo uppipe and passenger side manifold. we didnt want to jack up the engine and we were planning on doing some port and polish work to the manifold and turbo too...thats why we took out the turbo...

this is where my suspicion begins. i was reading up on how to port and polish a while back...and basically port the manifold holes and the turbine inlet to match the gasket. smooth out all the casting lines and all. so when i was looking at the car today. i checked the diameter of the exhaust ports on the block and manifold, and they were the same diameter, then i checked the uppipe and the turbine inlet hole diameter and the uppipe was smaller than the turbo. so im thinking to myself how port and polish would smooth out the flow? its not like the flow of the exhaust is hitting a flat flange before continuing. true that smoothing out the weld lines and all would help a bit, but i dont see how it would make a noticable difference. im not saying that its false claim, but just want to understand how it would help when there isnt much of blockage of the flow.
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