Gutted h22 plunem

[cb7k-9 unit]

O.k just put the h22 plunem and throttle body on my a6. My question is does gutting my plunem make a real difference in power. I also have double spacers( not gutted as well). Should I take everything back apart and gut the plunem and spacer or just leave it be. It runs strong as is, but if there's a noticeable difference

[deevergote]

I wouldn't. "Gutting" most things just results in turbulence... which isn't good for smooth airflow.

[92smokeaccord]

if u gut it u would have to make swirl lines in the ports to make the air cyclone in for better response and to get rid of turbulence. also to better this factor do the same right behind the throttle body so gets more spin.

[cb7k-9 unit]

O.k I will just leave it the way it is. I've only had it on for a day and haven't fully got to enjoy it yet. Thanks guys

[GhostAccord]

if u gut it u would have to make swirl lines in the ports to make the air cyclone in for better response and to get rid of turbulence. also to better this factor do the same right behind the throttle body so gets more spin.

Swirls are not required in a intake manifold surface. If the boundary layer of air in the runners is proper. The fast moving air won't even come in contact with the swirls in the surface. When porting an intake you want a uniform roughness throught the length of the runner. Approx. 45-90Ra (60 grit) This will promote a good boundary layer. This boundary layer is what helps keep intake velocity. Keeps the air from sticking to the runner/intake surface.

As for the length and surface area of your runners. It all depends on where your engine makes it's peak tq. Runner length and surface area are both very important. Just opening up a runner or making it longer or shorter will change the characteristics of your tq range. Not always for the better if your cams/engine isn't built for that range. You may have seen some dyno charts fall flat on their face. This is possible reason why!

[deevergote]

Swirls are not required in a intake manifold surface. If the boundary layer of air in the runners is proper. The fast moving air won't even come in contact with the swirls in the surface. When porting an intake you want a uniform roughness throught the length of the runner. Approx. 45-90Ra (60 grit) This will promote a good boundary layer. This boundary layer is what helps keep intake velocity. Keeps the air from sticking to the runner/intake surface.

As for the length and surface area of your runners. It all depends on where your engine makes it's peak tq. Runner length and surface area are both very important. Just opening up a runner or making it longer or shorter will change the characteristics of your tq range. Not always for the better if your cams/engine isn't built for that range. You may have seen some dyno charts fall flat on their face. This is possible reason why!

That's exactly right. When I first learned that (admittedly, only a few years ago...) I went to Bisi for clarification. He explained it quite well. Basically, the air that is slowed by the roughness acts as a lubricant.

[Gtseviper]

Thank you for that info guys. I will check my runners again, when I remove my modifed F22B intake manifold ports and I will correct any problems that I might be feeling at certain parts of the engine. I open my ports length wise Right now, I only feel real power when I get on the engine after about 4000 rpms. I learn something everyday from you guys on cb7tuner. I currently have this intake on my engine

I did use a die grinder, but I didn't have the correct porting tool. So, I think this time around at my second engine build go, I will use the right bur to port the manifold. This was done with all my elbow grease and I was really tired after. As they say the right tool is half of the job. I am learning.


I am willing to listen to what you experience engine guys have to say about the modification...How can I make this intake better? If I have a problem
thanks