i'm in the middle of the engine rebuild of my tII S5 vert! just wanted to share some pics and hear some opinions about my DIY porting!
should be some mild street port...

my thought's were: to increase the intake port area without increasing overlap and compromising street performance such as low and mid end power! as for the secondaries, i only delayed the closing time and did not touch the inner or outer edge of the port. the primaries are significantly larger than stock, 'cause the provide a lot of material behind them to not run the risk of cutting the waterjacket. also the outside of the primaries is not as close to the corner seal as the secondaries, so i compensated that

be aware that the fine tuning work is not yet done, so they might look a bit rough...

i did my own templates to being able to copy the second port from the original one...

 

some more...

 

looks pretty good. what kind of power are you looking to make in the end??

 

whp should be around 340, i'm going to run it with my new BNR stageII hybrid! the ports are quite conservative i think, but must be streetable, so i think they'll do well!...
i'm curious how the'll perform

 

i changed my mind slightly and extended the ports quite a bit again... i thought that the engine once being apart, should take the chance and be really different once rebuilt

now i think we can call it extend porting?? what do you think?

 

Did you open the port timing earlier?

 

by earlier you mean grinding the outer side of the port? No!
'cause i didn't want to take any more support away from the corner seals! in stock configuration, the corner seals are only supported by aprox. 70% of their area!

what i did is going outwards with the primaries to the same distance (port to rotor housing) as the secondaries.

 

no opinions?

bump