JAKE1

I am new to rotarys, so very new that when i did a search and read about blocking off the acv port, that i didnt understand many differences between s4, s5, ect.

I have used a block off plate to cover where my acv went and have removed the air pump. On my particular rotary do i have to do anything else to get the other ports to open?

note: this motor is going in a buggy so there is no factory wiring or a/c ect.

AcidShock

iTrader: (49)

Well, if you have an S4 (years 1986-1988), then the 5th and 6th ports are actuated by exhaust backpressure. On the other hand, if you have an S5 (years 1989-1991), you have disabled your 5th and 6th ports. They are actuated by the air pump.

JAKE1

So buy installing the block off plate that should be it? cool!

Icemark

The air signal for the 89-91 VDI and aux ports, does come from the ACV though. If he has a 89-91 and removes the ACV then he will need to jury rig something from the air pump to get the aux ports and VDI to work correctly.