I have seen all the pictures, Etc. I want to know why the secondaries were made into a egg shape?

I seem to see those egg shape runners are not ported out very far up the runner, why is this?


I would think trying to make each runner a straight shot would be best, but I see in the write up, it has made the runners with more turns.


why didn't the lower manifold get ported to match the engine?

 

I wondered the same thing before I actually saw the manifold up close. It only applies to the S5 n/a manifolds. The others do not need to be made egg shaped. The middle runners on this manifold are wider but taper at the last moment to the smaller round shape. The turn is not very gentle either so turbulence is created. I don't like enlargening runners that much because I would rather have the higher velocity but this proved to work good regardless. I would like to go back in and fill in some spots to get the velocity back up. The runners don't have any more turns, just revised ones.

I do match my lower to the engine. Then again I also port out the dynamic chamber as well.

 

Rotary God.... I wasn't refering to your new write up.

I was talking about the sticky at the top of the forum.

 

I know but it does apply since I do that mod as the first step in mine. That was the reason they need to be egg shaped.

 

Match porting is always good.


-Ted