Riot_Polizei
Comp Engineering Student
- :
- 2002 Mazda Protege5
I've been reading up on the VTCS removal, and the accompanied porting and polishing of the runners. It seems like a cool weekend project once I pick up a spare intake manifold, and I can't wait to try it!
There's just one thing that's bothering me about it.
In the guide most commonly linked for the aforementioned tasks, it specifies that there's a "lip" inside the runners that "stumbles" air flow. Seems reasonable enough to shave it down for laminar flow.
Yet, in the other pictures and diagrams, you can see that the author of the guide continued to port and polish the runners up to the open end that connects up to the engine block. Doesn't this simply create a new air-impeding lip by making the runners have a wider diameter than the ports on the block? Or, is this not the case?
Here's a crude diagram that'll hopefully demonstrate what I'm seeing:
Any ideas?
There's just one thing that's bothering me about it.
In the guide most commonly linked for the aforementioned tasks, it specifies that there's a "lip" inside the runners that "stumbles" air flow. Seems reasonable enough to shave it down for laminar flow.
Yet, in the other pictures and diagrams, you can see that the author of the guide continued to port and polish the runners up to the open end that connects up to the engine block. Doesn't this simply create a new air-impeding lip by making the runners have a wider diameter than the ports on the block? Or, is this not the case?
Here's a crude diagram that'll hopefully demonstrate what I'm seeing:
Any ideas?