CharlieGSanD

but when my head was off, i remember the exhaust valves dwarfing the intake.....these look much more similar in size.....

the non-DBW head has bigger ports...is it possible it has bigger intake valves as well?

CharlieGSanD

or is that not alowed in the shootout?

Lightweight-USPowah

If your coming down 95, I can tell you exactly where to go for some VP 105..

Audi2ptzero

The stock ATW has 3 very small intake valves, while my new AEB has 5 valves that are just about the same size if not the same size.

Here is a pic of my AEB head with the valves out
<img src="http://www.racesolutions.com/gallery/gallerymh/20V4.JPG">

RussB

Ultimately, of course, a dyno is the proof of the pudding, but a flow bench will tell you whether you're moving in the right or wrong direction when working on your manifold or head.

It's hard to predict how a column of high speed air will behave as the valves open and shut at different frequencies.

Ironically, polishing port surfaces or "cleaning up" ports sometimes results in loss of power in the RPM range in which you actually wanted more. It's easier to screw up an engine's power curve by uninformed cutting and polishing than it is to improve it.

Don't bother getting out your Dremel tool unless you either have a flow bench or are following the patterns that were prepared by someone who used a flow bench and dyno for a similar model manifold, head, and engine.

Tuners whose engines win races always use these tools.

xr4tic

Like I said, I think the Schrick intake valves are slightly larger, but not by much.

Maybe the DBW valves are different?

xr4tic

I'm sure those overhangs are good for flow.

Air likes smooth radiuses, so if the inside of the manifold has sharp corners, then it may be beneficial to smooth them out. Hence the reason I asked.

You're more likely to mess airflow up if you start grinding away in the bowl or port radius areas.

Audi R4R

I'm sure you've seen the stock intake manifold. I didn't take pictures of the before and after (geez I wish I did). But I got another shop (Hayward Racing) in my area to do this job along with all the other engine porting work.

Cheers!,

Steve

Audi R4R

Sharp edges need to be polished to reach optimal efficiency and air flow. As the previous post said: the dyno will tell, but I don't have a pre-port dyno chart (or any dyno chart at all! There isn't a 4wd dyno I know of around my area!).

Audi R4R

I hope to get my hands on,... if not, then I'll get it in NJ. I don't know if we can get it in time!!!

*stressed out*

Steve