What is the difference between a 4 port and a 6 port. Pics would really really help.

 

The difference between a 4port and a 6port is that a 6port has two additional intake ports that activate at around 3800rpm to let the engine have higher rpm power while still retain low rpm torque. The 6port was only found on the NA rx7's and the turbo RX7 had 4 ports.

 

thanks i really appreciate the info anyone else's two sense?

 

just to add on to the question 1:why wouldnt they use the 6 port on the turbo 2:how do the extra 2 ports activate or open

 

Seriously? I'm at a loss but I'll throw out 2 additional ports

NO. Please, if you don't know the answer stay seated so the wrong answers don't fall out. The "3800 hesitation" is primarily from the secondary injectors coming online & bad grounding. Search more and post less especially about things you have no clue about. The Aux ports don't activate as in instantly open like you're describing. In the S4's they work from exhaust backpressure and when it begins to climb is when they begin to open.

 

(Read the FAQ and FSM, it will answer this question easy as pi--That is not a typo)

As previously stated the S4's use exhaust pressure to activate the ports. Usually the activation occurs when the exhaust pressure reaches around 2psi or so. This means that it could activate at any RPM on the Tach, however most common occurances appear to happen around 3200-3800 rpm when under load. Remember it's exhaust pressure that does the activating.

On the S5's they are activated using an either an electric pnumatic system or the airpump (I can not exactly remember--I think it's the Electric though). The pressure of activation remains the same and is again around 2psi. This however is usually set to activate at a specific RPM regardless of load conditions.

These ports are used as previously stated to maintain low end torque without suffering for it at top end. It's a similiar if not the exact theory behind VTEC, ECO-TEC, and every other variable valve timing out there. It's a way to have more torque at low end while not suffering at the highend of the RPM range.

As for not having a 6PI on the turbo models there would be no real advantage to it as far as I could fathom. By the time the activation would occur of the 6PI the turbo would already be making boost. Low end torque would be less of an issue since the turbo would be making boost lower than the activation point. Granted the torque wouldn't be there at idle to boost, but that distance is extremely small. The 4 port setup also is about the same size if not just a little smaller than a fully opened 6 port setup. This is primarily the reason why those who do N/A conversions usually either tie open the 6PI or remove the sleeves.

There are others that use the 6pi on turbo setups, however you would have to remove the actuators and the ACV to make the turbo fit (Not to mention the airpump). Which would mean another form of activation would need to be put in place.

 

this is the diffrence

1st pic is 4 port and second pics is 6 port

 

So did 6 ports just come in a certain year or all na years, and same for 4 ports or what.

 

all N/A engines are 6 port only the 84-85 gslse engines are N/A 4 port.
all turbo engines from 87 to 95 are all 4 port

and all 12A engines are 4 port

 

Ok well thanks for the info guys i really really appreciate it.

 

All Mazda NA 13Bs from '84 and above are 6 port. The GSL-SE is 6 port.

Older 13B NAs are 4 port. You will find these in the RX-5, RX-4, REPU, etc.

Not true. Mazda made a 6 port 12A. I don't remember which car it was used in.

 

thanks bro that bout explains everything