Correct on the RX8 side ports. There are studs coming out of the
block and 3 holes, one in each end housing and one in the center
housing.

Yes the stock RX8 uses EFI. A carb will work fine on
an RX8 engine. The best bet is a Holley 500 CFM 2 barrel.
P-port manifolds are easier to build even if you don't
need the extra HP. You need to bore holes in the RX8 rotor
housing. Jeff Doddridge will do that for you but it is
easy to do it yourself if you have a mill.
Here is a how to set:

http://www.youtube.com/watch?v=NKJ00JsnS8A

http://www.rotaryeng.net/fund-of-intake.html
http://www.rotaryeng.net/Welded-steel-p-port.html
http://www.rotaryeng.net/HOW-TO-INSTALL-HOLLEY.html
http://www.rotaryeng.net/slide-throttle.html

In general you want to read all the articles in this
section of the web site and look at all the pictures.

http://www.rotaryeng.net/intake.html

Paul Lamar

Thanks for all the good photos. Not that many pieces is it?

Just curious ... ballpark figure... how much might it cost just to buy the
pieces new and put it all together (give or take a few hundred)?

R

The intake system? We charged $150 for boring two p-port holes
with the sealing plates thrown in. Jeff can do it better than
us as  he as a NC mill which can do the job in minutes.
It took us about 45 minutes on each hole with a manual mill.

You will not need a slide throttle as the Holley has the
butterflies built  in and an RX8 p-port won't idle any
worse than a 13B side port engine.

180 degree tubing bends are about $30 each.

The Holley is about $250. A Weber would not be able to
be leaned and would cost you about $1000 and would not
work noticeably better than a Holley in this application.

You will need carb heat of course.

Paul Lamar