Which Holley carb do you recommend for the Renesis, if I decide to go that
 route. Not "P" ported.

 --
 Karibian

 Won't work on the RX8 engine unless you go P-port and use the
 big 2 barrel Holley. There is no carb manifold for the RX8
 engine to my knowledge. Do you have a 4 port or a six port
 RX8 engine. ( I don't use the word "Renesis" because I do not know
 how to spell it. RX8 is easier :))

 Here is some stuff on the big 500 CFM 2 barrel Holley.

 The trouble with the rotary after market manifold situation is there
 are so many variations on the intake configuration that the market
 is not large enough to support separate costly cast intake manifolds for
 all the variations. That is a major reason we support P-ports.
 P-ports work and fit the  same on all 13B and RX8 based engines.
 The side benefit is you get 50 HP more and they are a couple
 of pounds lighter in weight.

 Here is a list of Mazda 2.6 L two rotor rotary engines
 that all have different intake porting.
 13B early 4 port.
 13B 2 nd gen six port. Most popular.
 13B 2 nd gen turbo 4 port.
 13B 4 port Cosmo. Rare.
 13B 3rd gen turbo 4 port.
 RX8 4 port. Now obsolete.
 RX8 6 port.

 Also check out Mazdatrix Holley carbs for early 4 and 6 ports.
 http://www.mazdatrix.com/R-HOLLEY.HTM

 Paul Lamar

Paul, how do you envision setting up carb heat?  Could that carb be modified
to run inverted as an updraft rather than downdraft?  If so it seems like
that would make it much easier to integrate.

Everett

The Holley will not run inverted as is and as far as I know nobody
has ever got that to work. I am not saying it is impossible but
it is very unlikely.

The FAA will not sign off a carb engine without carb heat. It is mandatory.
If you use the side configuration shown in some of these 3D's it is very
easy to add carb heat as the super hot muffler is just below the carb.

Paul Lamar