Paul,

In addition to my earlier email I need to know how the block is
supposed to be fastened to the Renesis engine. The outside take a bolt
OK but the the inside take what kind of fastener. There are studs there
and there is no room for a socket to get over any nuts. In fact I
don't have any nuts that size of threads that will fit in there. Do
you have some special Nuts for the inside? Also I need what goes on top
of the block that is held on  by the four screws and take a high
pressure radiator cap. Do you have a phone number so we can talk?

Rolland LaPelle

You must remove the studs and take one to the store and buy metric
internal wrenching bolts (AKA hex head) with the same diameter and
thread as the stud.

Remove the stud by putting 2 metric nuts on it and jamming them
together. Then unscrew the stud.

Metric bolts have 3 options on the number threads per mm so make
sure you get the right bolts. If the bolt will screw into the nut
that fits the stud threads you have the right bolt.

Then get a metal gasket for the RX8 water pump
from a local Mazda dealer. Don't use RTV or a home made gasket
as nobody has been able to get that to work yet. The next thing
is 1/2 inch NPT pipe plugs to seal the two holes that the bolts
went in. Or you can use those for vent lines or pressure taps
or sensor such as coolant water pressure or temperature.

Also holes can be drilled and taped in the bottom of the block
or the front side of the block for other/more sensors.

I like a temperature sensor on the outlet of the block (hot) and
the inlet of the water pump (cool) as that tells you how well your
rad is working. They don't all work the same. Mainly depending
on how well it is ducted and a myriad of other things. I
assume you have a P-port engine in an aircraft.

I have a special this month on my book How to Cool Your Wankel
for $30 plus $5 mailing. Normally sells in AC Spruce for $60.
Contact me for more info.

I also do a little hand "porting" inside the block with a die grinder
to clean up the curves but Jeff may have already done that for you.

Paul Lamar