OK, i have a feeling this might start a flame war but i want to hear opinions and facts.
The Topic: Intake runners on a cylinder head and intake manifold (wet manifold)... polished smooth or left slightly 'dimpled' or rough
my take on the subject (still learning myself here)
Rough finish- 'eddy's' on surface create turbulence and a small buffer area along the surface of the runners preventing the fuel from even coming close to the surface and condensing and puddling.
Polished finish-while good in a dry manifold application for air velocity, in a wet application (air/fuel traveling through runners) it causes pooling and poor mixture and actually creates turbulence because of the very very smooth surface.
Port velocity-Which is better in relation to port velocity. Bigger runner and rough surface for airflow or small runner with hi-velocity and polished runner, using the velocity to keep fuel atomized. Assuming both runners flow the same at lift point X. I already know that the if the same amount of air can be moved through a smaller port it WILL make more power due to increased velocity, but what happens when runner surface is factored in?
i think we need a physics section of the forum for stuff like this lol...let the games begin.
The Topic: Intake runners on a cylinder head and intake manifold (wet manifold)... polished smooth or left slightly 'dimpled' or rough
my take on the subject (still learning myself here)
Rough finish- 'eddy's' on surface create turbulence and a small buffer area along the surface of the runners preventing the fuel from even coming close to the surface and condensing and puddling.
Polished finish-while good in a dry manifold application for air velocity, in a wet application (air/fuel traveling through runners) it causes pooling and poor mixture and actually creates turbulence because of the very very smooth surface.
Port velocity-Which is better in relation to port velocity. Bigger runner and rough surface for airflow or small runner with hi-velocity and polished runner, using the velocity to keep fuel atomized. Assuming both runners flow the same at lift point X. I already know that the if the same amount of air can be moved through a smaller port it WILL make more power due to increased velocity, but what happens when runner surface is factored in?
i think we need a physics section of the forum for stuff like this lol...let the games begin.