http://www.mazdausa.com/MusaWeb/displayPage.action?pageParameter=upcomingNAIAS2004 Gallery&galleryID=hydro_4

they're humongous!

or are the 4 port engines like that too?

Go look at a ported 13B sometime. That isn't that big.

Go look at a ported 13B sometime. That isn't that big.

I've seen them pretty large, but stock? i wonder what kind of power output we'd see if ours were that large stock.

That is the stock size on all Renesis center housings.

Dave

That is the stock size on all Renesis center housings.

Dave

On the 4 ports?
I know for a fact that the 6 ports are not that large. I saw them first hand. They do not extend that far towards the center of the rotor.

I have built over 20 of these motors now. All 6 ports, and the port on the center housing is exactly the same as the picture above.

Dave

I have built over 20 of these motors now. All 6 ports, and the port on the center housing is exactly the same as the picture above.

Dave

Dave.. I'm not sure I agree with you.. At least they dont look that large.. Check my pictures from racing beat.

6 ports (http://jedi.betterbox.net/images/rx8/sevenstock/renesisintakeports-01.jpg)

The bottom of the 4 port looks much wider than that of the 6 port and the top of the 4 port extends further towards the water jacket than the 6 port.

or at least it looks that way...

Thanks for the info.

Dave

Ajax you are confusing the intermediate housing ports with the outer housing ports. On the intermediate housing, both the 4 port and the 6 port engines open at the same time. The 6 port primaries close 10 degrees later though. The outer plates are totally different. The lower port in your picture is there on the 4 port engine. In the 4 port it closes 10 degrees later. Obviously the 4 port engine doesn't have the upper port.