Hi everyone, I'm about to demonstrate more of my ignorance about the
Renesis engine; here goes.

This first picture is of the water pump, which has 6 connectors
(labeled 1-6). Two of them (#1 & 3) appear to be the primary inlet and
outlet, but what are the rest for?

The second photo shows one more coolant connector (#8), don't know
where it goes. #'s 7 & 9 are sensors; I'm guessing #7 is a knock
sensor, but don't know what 9 is.

I've got the RX-8 service manual on CD, but it's not very user-
friendly when it comes to answering questions like this.

Kenith Arron


The first picture is of the thermostat holder. The top is hot water
out of the block and the bottom part is cold water into the water pump.
Most people remove this device and build and adapter to  achieve the same functions. In theory what one wants to do is use cowl flaps to control engine temperature as that reduces cooling system drag during low power cruise.
Also removing the thermostat allows the water pump to pump more water with less HP consumed. More water flow improves the heat transfer from metal to water.

Second picture:

7 is knock sensor.
8 is heater hot water out of the block.
9 is oil pressure sender.

Last picture the answer is yes. A Corvette device also work well.
Shoot for a 30 psi pressure cap.

Paul Lamar