Does anyone know if anyone had done any research in this area? I'm not thinking about dome thing ludacris like 12:1 but how about a 10.5:1 i only ask because I see that there are some N/A P-Ports's making in the area of 500HP with standard compression rotors, and I was wondering if a slight increase in compression could push them into the 6-700 range. Just a question I thought about today at lunch. Thanks guys.

 

I believe RX-8 rotors are 10.3:1.

But there is a reason why compression cant be raised too high on a rotary.. I think its something to do with volumetric efficiency... I cant remember, but mabey somebody can fill me in.

 

I can't remember if you can use RX-8 rotors in a 13B. You have to forgive me it seems that my brain isn't working today.

 

Just to chime it, it has something to do with the clearance between the rotor face and rotor housing getting too small to promote adequate combustion, what with the disadvantageous rectangle shape of a rotary combustion chamber to begin with.

The situation (though in practice bears little to no resemblance to this) reminds me of old flathead engines where the higher you made compression the more you hampered flow into/out of the head by the valves. Happy mediums.

Yes you can use renesis rotors in a prior gen 13b.

 

The Renesis rotors are 10.0:1 with the option of race rotors that are 10.2:1.

From what I've read 11.0:1 is about as high as you can go. Above that they will create two flame fronts (one at each plug) that can cause detonation when they collide with one another.

 

so where might I find the race rotors
preferably used because I"m sure they are high dollar brand new

 

Also, does anyone have any dyno sheets or other info on the differences in rotor usage on N/A P-ports.

 

AFAIK mazda is the only place to get them and I haven't a clue where you could get a used set.

gmonsen could probably tell you what they cost new since he has them in his 20b fd.