Rotary Car Club - View Single Post - Semi p-port: Does size matter?

N.RotaryTech · 08-28-2015, 02:39 PM

So basically my question is about the size of the hole.

And correct me if I'm wrong on the terminology of:
"Full P-port" or just "P-port" have the intake ports on the irons closed off and there are big holes in the housings.
"Semi p-port" uses the ports in the irons and has holes in the housings as well.
Right?

So back to my question of the size of the holes in the housings for a semi-p-port.
What Ive seen so far on semi p-port builds is a fairly small hole.
So...
What if you go bigger?
Why not go as big as one would go on a "full p-port build?
Do you run into some "volume-metric efficiency" issues?
What if this engine would be turbocharged?

08-28-2015, 02:39 PM	#1
N.RotaryTech Home-brew Rotary Join Date: Feb 2008 Location: GooseCreek SC Posts: 552 Rep Power: 18	Semi p-port: Does size matter? So basically my question is about the size of the hole. And correct me if I'm wrong on the terminology of: "Full P-port" or just "P-port" have the intake ports on the irons closed off and there are big holes in the housings. "Semi p-port" uses the ports in the irons and has holes in the housings as well. Right? So back to my question of the size of the holes in the housings for a semi-p-port. What Ive seen so far on semi p-port builds is a fairly small hole. So... What if you go bigger? Why not go as big as one would go on a "full p-port build? Do you run into some "volume-metric efficiency" issues? What if this engine would be turbocharged? __________________ '89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior. '83 RX7, The "this might take awhile" project. '87 RX7 GXL, Rest In Pieces. '98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair. '94 Ford Ranger, daily.