When I disassembled my 20B last week, I was pleased that  all the rotor
housings were in good shape and there was no evidence of  overheating.  All
apex seals moved freely and I didn't see any  significant problems except
one......The front side housing had a spot the  size of a dime that was
deeply
pitted as if a single drop of water sat on  the iron for a long time
causing
it to rust and pit, although there  wasn't any rust.  I'm not  comfortable
reusing it, so I'm going  to get a new one !!!  So the  question
arises....since
I have to  replace it anyway, should I just get a new  20B front side
housing and  modify the water pump (which is still a big  heavy beast), or
is  it
possible to just use another parts combination?  In  addition,  I would
also
really like to use the RX8 Rotors if they will work   because they are
lighter
and have a 10:1 compression which would be great  for my  normally
aspirated
application?.......

I remember  recently reading a post from someone in this Group who is
building a 20B  with RX-8 Rotors, Front Cover, Water Pump and CAS.  I
remember
him making the statement that the RX8 CAS is much better (but I  don't
 know
why that is).  Paul, do you know who that was and if  he has been
successful
at making everything work?  And what is  better about the  RX8 CAS?

Thanks,
Don

I think you can  use a 3rd gen RX7 front housing. Maybe even a RX8 front
housing. Check
with Mazdatrix on that. They sell them as well. Ask them about the RX8
rotors while you
are at it and report back what they  say.

562-426-7960 For Parts Ordering, and General info
562-426-4460  For Local Service and Parts

Paul Lamar
--


OK, I'll try to give them a call sometime soon.
Do you have any idea about the RX8  CAS?
Don


Yes it is very simple. We have fooled with them a lot.
Here are a couple of pictures of Mark's installation on his
3 rotor of the RX8 sensor.

A hall Effect sensor does the same thing and it is a lot cheaper.

Also a ABS sensor will also work the same and it is only $16 at Pep Boys.

What kind of EFI system are you planning?


Paul Lamar

Paul,

The bracket shown in the attached pictures didn't work.  Turns out the CAS
bracket needs to be made of non-ferrous material, not 4130 as I did.  Once I
duplicated the bracket in aluminum, the CAS signal cleared up.  Who would
have thought???

Mark S.