Hi,

I was reading this thread in the archive:
https://www.rx7club.com/showthread.p...threadid=79511

But the Images are not available anymore.

Does anybody has some (or those?) pictures of ported intake manifolds?

Thanks.

Daniel

 

Honesty, intake porting is not going to gain you much, if anything at all. Mazda purposefully designed the intake manifolds not to fit up perfectly, which helps with reversion.

Porting them out is something to do if you are board and you already have the intakes off of the car. I don't think that anyone has actually shown a dyno improvement on a set of ported intake manifolds.

 

True, i did it with mine and i saw no improvement, not even in response. Which is why i never made a post in the past about it because its a bust. I ported the LIM as far as i could without sacrificing to much turbulence. The stock intake manifold design is probably the best it could do until you start doing some fabbing, even swapping the FD UIM into a S4 is debatable, however going with a larger intake manifold will provide some power. If i had time and resources id prefer to have an intake design similar to the RX-8 with a gradual curved flow with separate flow veins from a 2 part UIM, then instead of a single 30mm butterfly valve id, match it with ITBs for each runner.