Rotary Car Club - View Single Post - 6-Port Power

NoDOHC · 10-25-2009, 12:34 AM

Has anyone here exceeded 200 WHp with a 6-port rotary?

They are SO much more common than 4-port rotaries that I am tempted to build one for power.

The biggest issues that I see are:
Not large enough ports to breathe with 6PI closed
Too late of intake port closing with 6PI open
Runners too small on LIM
Runners too small on UIM
Impossible to port UIM due to complicated geometry.

I am looking at some Metal-ceramic compound that I may be able to fill the upper part of the 6PI in with, allowing more advantageous port timing. I could then convert the secondary and auxiliary ports to a single port and run a 4-port manifold.

I could also build a custom intake manifold for the 6PI (possibly using the factory LIM, as it can be modified to flow pretty well). This would allow the 6PI to remain intact (giving better low end dynamic compression ratio).

10-25-2009, 12:34 AM	#1
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	6-Port Power Has anyone here exceeded 200 WHp with a 6-port rotary? They are SO much more common than 4-port rotaries that I am tempted to build one for power. The biggest issues that I see are: Not large enough ports to breathe with 6PI closed Too late of intake port closing with 6PI open Runners too small on LIM Runners too small on UIM Impossible to port UIM due to complicated geometry. I am looking at some Metal-ceramic compound that I may be able to fill the upper part of the 6PI in with, allowing more advantageous port timing. I could then convert the secondary and auxiliary ports to a single port and run a 4-port manifold. I could also build a custom intake manifold for the 6PI (possibly using the factory LIM, as it can be modified to flow pretty well). This would allow the 6PI to remain intact (giving better low end dynamic compression ratio). __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)