Paul  ,
One of the rotor housings I  sent has a very small chip out of the  steel
liner at the
edge of the housing.They should be arriving  today.
If you have time  would you please take a look at it and let me  know if you
have  any
concerns.
Thanks,
Geir

Hi  ,Paul

Just wanted to confirm my rotor housing's arrived last   week.If you could
let me know
what you think on the chip ,  I can  round up another housing if nec.

Thanks,

Geir

The chip is  not a  problem. They look OK. Thanks for cleaning them  up.


Paul  Lamar



Paul--Maybe it would be helpful  for folks rebuilding with  used rotor
housings if you would take a  photo of the chip in the housing  (and/or
other
other housings) to  give builders an idea of what is  servicable or not?

Steve  Beckham.

That is very subjective. Some  of them that look pretty  bad will still
work.
You may be down on power and  torque in the lower  RPM ranges. In the upper
RPM ranges
it hardly affects  the power at  all. Urban legend has it if you can get it
started it
will  run  without apex seals.

It all boils down to if it will start it is   probably OK assuming there are
good apex
seals in it. I suspect the  new  apex seals and the housing come to a mutual
understanding
so  to  speak.  A bit of wearing in of the apex seal and a bit of  wearing
in
of  the rotor
housing to a lesser extent.

The  vast majority of after  market seals on the market do not have  the
slight crown shape
of the stock  Mazda seals. My guess is this  is 99% of those after market
seals. If you
check the compression with  new rotor housings and the new after market
apex seals the
compression  will be down about 10%.

In one case of  after market seals that I  know about the housing was
scratched with only
a  few hours of  running. For that reason I do not recommend after market
apex  seals  as
the surface finish is not nearly up to Mazda standards. The stock   seals
are heated with
a laser and cryogenic cooled. Technology beyond  the  after market
providers. The only
exception is the Ianetti  ceramic seals.  If you buy a set of after market
apex seals
inspect  them with a high power  jewelers loop and reject them if the
surface  is not a
mirror  finish.


Paul Lamar



Would  you NOT recommend the RA seals?
Don

That is correct. I do not  recommend them. You can buy stock seals
from Mazdatrix or Mears Motors in  Lubbock with a discount.

http://www.mearsmotors.com/

Paul  Lamar


Hey Paul,
Is Bob Mears active on this site?
I totally forgot he's in Lubbock.
I'm working temporarily in Lubbock and would LOVE to contact him and maybe
go by to see his Spitfire 20B project !!

Don

Give him a call tomorrow. I am sure he will show you his airplane.

6027 Spur 327

Lubbock, TX 79424

(806)747-2931 or (800)692-4497

If you ever get out to Midland stop by the Oil Museum and see my
2F race car :)

Paul Lamar