thisisnotahonda

I know that automatic transmission 8's came with a 4 port engine, and the manuals a six port...but...I really don't understand even after searching what the difference between the two is.

So...besides the transmission difference, how do the motors differ?

Jon316G

iTrader: (1)

The '06 and current auto RX8s have a 6-port engine too... its only the '04 and '05 auto models that have 4-port engines.

The 6-port has more HP, torque, and a higher redline.
The 4-port has two intake ports (per rotor) while the 6-port has three (Auxiliary port is the 3rd).
The 4-port doesn't have a VFAD to allow more airflow into the front duct.
The 6-port has six fuel injectors (3 per rotor) while the 4-port only has four (2 per rotor).
Might be others... that's all I can think of at the moment...

ZumnRx8

the ECUs are different
the 09+ engines are waaay different
the 4 port has 1 oil cooler the 6 port has 2
different drive shafts

jasonrxeight

4 port has 2 intake ports per rotor
6 port has 3 intake ports per rotor but the upper port opens only when needed more like a variable intake valve timing stuff to piston engine

4 port intake layout


4 port side housing


6 port intake layout


6 port side housing