cpubugs

I can see the porting providing great advantages on an NA beast, but when dealing with forced induction does the porting really make that much of a difference? The way it was explained to me was that NA motors be it piston or rotary act more like a vaccume so having the motor ported and polished allows for less restricted air flow ect... But with forced induction it doesn't seem like that would be as much as an issue.

classicauto

iTrader: (3)

This might be a topic for general automotive...

but some of the basics are simple.

A turbo charger puts more air in the motor then the motor can suck in by itself. Porting an N/A engine let it suck more air then it could before.....just on a smaller scale then the turbo. Therefore a turbo'd engine, in many ways, is an N/A engine with ports that can flow more air then their physical size.

when dealing with turbos porting makes a larger difference because you now have to also deal with the fact that because the motor can actually flow more then it could before, that extra flow will be spooling the turbo that much more, and therefore pumping that much more air into the engine. Things like sizing the turbo change since you will need a larger exhaust side to accomodate higher rpm (you don't want to choke the porting on the motor with too small an exhaust housing) and a larger compressor to feed the now hungrier engine...

unW7WZ

yes....AFAIK, porting=bueno... Forced induction or NA...It seems the idea is get more air in and more air out...as long as there is supporting fuel, then the faster in and faster out, and more of it, the more horsepower... What kind of port are you talking about? That may make the biggest difference in all of this... I have personally never seen or dealt with porting, but i believe this is the idea behind it. Also, as he has pointed out, restricting the intake amd exhaust flow may hold a high bearance on a ported motor.

cpubugs

Feel free to move this to the correct forum if it would be better somewhere else. Basically I was looking in to getting a large street port done on my TII engine, but then when really looking at it and asking a few of my turbo sauve friends they seemed to think that because it is being forced inducted that the porting isn't as neccesary. My first instinct is to do it anyway just because I love the way a ported rotary sounds. And after reading your posts and I am sure there will be more, I think you have convinced me even more. Not to worry I will be getting a Haltech before I start any actuall upgrades, but things like the fuel system and exahaust will be upgraded before the porting and larger turbo.

Virus86

With an N/A or a T2 there is one basic idea to think about,
More in + More out = More power.
The smoother the transition in and out will drastically improve performance. I just finished my my rebuild on my 'NaT2' (N/A block with T2 intake and turbo) and I ported everything! Ported out the auxiliary ports to merge with the secondary ports, matched the intake to the block, took out the exhaust diffusers, stainless exhaust manifold and ported out the turbo exhaust side as far as I could. I haven't had it dyno'd yet, but compared to a buddy's T2 it feels like 2x's the power.

So I say port it! More in, more out...