first time porting, how do they look?
05-09-11, 09:22 PM
#1
first time porting, how do they look?
s4 6 port irons. i used pineapple racing 6 port SP template, havent done anything to aux ports yet, i may smooth the transition from aux port into engine, but dont plan on opening it up any sizeable amount. honest opinions please, any advice or suggestions will be much appreciated. i will try to get some more pics/higher res pics of different angles soon
05-09-11, 11:45 PM
#3
thanks, i was scared as hell that ide break into the jacket. i have constantly read over and over how little room there is on 6 port motors before breaking into the water jacket, so i went with the notion less is more. i also went with some porting theories saying that the port shape is what matters, and not to mess with the runners too much, just clean up the casting.
i finished with some 220 grit on a flap wheel to get it smooth, but not polished for better fuel atomization.
i havent done the exhausts yet. im still up in the air if i am gonna try to find some turbo housings, turbo exhaust inserts, or the long task of grinding out the diffusers, due to my severely limited budget, im leaning towards grinding them. either way im gonna send the housings to goopy performance for resurfacing
i finished with some 220 grit on a flap wheel to get it smooth, but not polished for better fuel atomization.
i havent done the exhausts yet. im still up in the air if i am gonna try to find some turbo housings, turbo exhaust inserts, or the long task of grinding out the diffusers, due to my severely limited budget, im leaning towards grinding them. either way im gonna send the housings to goopy performance for resurfacing
07-04-11, 12:50 PM
#4
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I've always wondered why people tend to port them so smooth. Perhaps they just tend to look smoother in pictures than they really are, but in the piston world, it's pretty well-known that polishing runners which carry an air-fuel mixture results in poorer mixing. Fuel sticks much better to smooth surfaces than rough ones.
On that note, I've even seen some dimple-style porting on certain heads that I'd like to try out on a rotary, just for kicks. Kinda like a golf ball.
On that note, I've even seen some dimple-style porting on certain heads that I'd like to try out on a rotary, just for kicks. Kinda like a golf ball.
