Ok I'm throwing this one out there...... I asked about this on the TPI page a couple of months ago but got little response
I've got a set of SR Tourquer heads with 58 cc Chambers that I'm gonna throw on my 5.7L. and it'll probably be a little while before I put them on cause I'm trying to collect a couple of other peices before tearing everything apart.
The question is...... What do you guys think about polishing my ports, specifically the intake side? Cause I'm already planning on polishing the exhaust side. I also plan on polishing the combustion chamber.....
My thinking with the intake port came about after looking at aluminum heads ( they are so smooth) and the fact that my car is a TPI...... with the injectors pushing 50 lbs I don't think that I would have to worry about the fuel dropping out of suspension..... I know that you want some turbulence with a carbed car, but the injectors are pointing at the intake valve.......Do you still want the turbulance caused by the casting????
What do you think??? Opinions? Any benefit/losses??? By the way the bowl work has already been done as well as gasket matching.....
Thanks!

 

You don't want any wet portion of the intake polished. Although the injector points at the intake valve, fuel still gets sprayed around in there.

Go ahead and polish the exhaust ports & chambers as planned. Leave the intake ports slightly rough.

 

pollishing the combustion chambers can lower the chances of detonation slightly by reducing the total surface area, rounding off sharp edges and removing minor hot spots, pollishing the exhaust ports can reduce turbulance which may help flow rates, the intake port on a DIRECT PORT INJECTED engine is a much differant deal than a carbed intake in that its basically flowing DRY AIR without fuel vs wet flow like a carb intake where the port finnish needs to be slighly rougher,so pollishing may help more than on a carb intake runner where the minor surface turbulance at the port boundry layer tends to keep the fuel in the flow, while the gains tend to be small, its generally a good idea on a DIRECT PORT INJECTED ENGINE

 

So there's 2 opinions from 2 very respectable members!!!! Thank you gentleman
What else can be said about this intake polishing idea???
Anybody?

 

They said the same thing Wet flow is any where that fuel is suspended in the charge. This is where you want to stay away from polishing the walls. The rougher finish helps keep the fuel suspended and supresses detonation. Not to metion the flow characteristics of air change completely when you add fuel droplets to the mix.

You don't want to go any finer than 40 grit on the intake runners or anwhere you've got fuel in the charge.

 

Not to say that I don't value the opinions of Five7kid, Grumpyvette, and Dialed-in. I've already taken their info and applied it. I left a rough surface within the intake port and polished the exhaust port..... and I'm in the process of polishing the combustion chamber. BUT.........

What about aluminum heads.... Take AFR's for example.... They look really smooth..... from pictures that is...... Are they cast a little rough as well then? Anybody with aluminum heads have something to add? I ask because the alumimum heads was what I was basing my idea on???

With so many members I thought that we could have a decent discussion.... Maybe everythings already been said???

 

Bump

 

I think you have the consensus;

-polish chamber and exhaust as perfectly as physically possible
-leave intake rough, 40grit minimum roughness, 'specially for a wet intake system
-if a dry intake system, can polish if desired. (manifold here, heads intake should still be rough, as it'll be wet no matter what induction is there.)

That seems to be the opinion of anyone i've ever talked to. In spite of the golfball analogy.