3) Anyone know parts numbers for the water and oil pumps from the 20B or
  maybe a supplier you've used that caries them?

  Jay


  Hi Jay;
  From what little I remember, the 20B's were somewhere between 2nd and
  3rd gen.
  A good place for used parts and information is rx7club.com. See also
  nopistons.com
  There are several forums you can search or post a want to buy thread:
  http://www.rx7club.com/forumdisplay.php?f=95
  http://www.rx7club.com/forumdisplay.php?f=99

  http://www.mazdamotorsports.com

  You can supposedly still order Cosmo/20B parts through your Mazda
  dealer. Some people seem to have a full Cosmo parts fiche. See this
  thread for hints (I should have bought that car):
  http://www.rx7club.com/showthread.php?t=788077&highlight=cosmo

  Some of the engine parts are here:
  http://cp_www.tripod.com/rotary/pg20.htm
  Cosmo:
  http://cp_www.tripod.com/rotary/pg09.htm

  possibly:
  http://www.partsnet.com.au/members.html

  Cheers
  Cary

  Paul,
  Here are some photos of the original water pump and housing side by side
  with the one I got from Atkins. I also included one of the front end
  housing. The oil pump is going to fit. So for now I'm just dealing with
  the
  water pump issue. Dan at Atkins suggested an 86'-91' pump and housing
  would
  fit the 20B without any fabricating or cutting. Can you corroborate this?

  Thanks
  Jay

  Your original pump is fine Jay. No need for the 3rd gen cartridge besides
  the
  that fact that it does not fit the 20B water pump housing. I'll take a
  closer look at my
  20B out in the hangar and see if I can find any disadvantages to sticking
  with the
  original pump.

  You may have to cut it down to fit under your cowl but that would be true
  of a 2nd or
  3rd gen water pump housing as well.

  Paul Lamar

  The front cover looks unique to the 20B but I am not sure. Mainly in the
  area of the oil drain back for the sequentially turbos.


  Please take a picture of the front cover both from the front and rear so
  we
  can tell if it will fit a 2nd gen water pump housings. Also please take a
  picture of the 20B front end housing from the front.

  The cartridge Dave Atkins sent you is a 2nd gen 8 bolt version. In order
  to
  use that you would need a 2nd gen water pump housing which may or may not
  fit your front cover.

  The only drawback I can see sticking with the 20B WP pump is the
  difficulty in finding a new cartridge if it develops a leak or the
  bearings
  go out. They can be pressed apart and the bearings replaced but that is
  what
  most people don't do. They just replace the cartridge.

  Paul Lamar


  Paul,
  The 13b water pump housing will fit on the 20b, but the 13b's impeller is
  smaller. Also, the Renesis water pump (removed from the front cover) will
  also fit the 20b. The Renesis entire front cover will fit, but it requires
  some machine work for it to clear the 20b front counterweight which
  is larger than the Renesis' counterweight and it interferes with some of
  the
  front cover casting. If you machine it for adequate clearance, then you
  are
  into the bolt head recesses which then must be welded up, but by this
  point,
  we're probably beyond what most people would be willing to do for the
  limited benefits of the Renesis front cover. Also, the Renesis front
  cover
  has a different shape and spacing around the oil pan. Not a problem if
  you're building a custom oil pan anyway. The easiest route is to cut the
  Renesis pump housing from the front cover (if you want to run the Renesis
  water pump).

  Who was it that commented about removing and replacing the 20b exhaust
  inserts. Having gone down that road, my recommendation is DON"T DO IT
  unless you're planning on turbo-charging your engine. I changed out the
  20b
  exhaust inserts for 13b turbo inserts. Now I'm pulling my hair out trying
  to get a muffler that will handle the torture of the rotary's exhaust and
  still quiet things down. Word has it that the splitter inserts are good
  for a 5db noise reduction. I constantly get the comment from people that
  they can hear me coming long before they can see me. Not exactly the
  image
  I want to portray. You can be sure that my new engine will retain the
  stock
  exhaust inserts.

  Mark S. Texas

  Are you talking about removing the RX8 engine water pump housing from
  the RX8 engine front cover? In other words sawing it off? That sounds
  like a good idea except for the cost of an RX8 front cover.

  The RX8 WP cartridge will not fit the 20B water pump housing.

  Paul Lamar

  The only drawback I can see sticking with the 20B WP pump is the
  difficulty
  in finding a new cartridge if it develops a leak or the bearings go out.
  They can be pressed apart and the bearings replaced but that is what most
  people don't do. They just replace the cartridge.


  Will the bearing from a 13B WP fit a 20B pump? Exactly how do you get the
  WP
  bearing out? Do I need a special Mazda tool? How about the impeller?
  What I'm getting at is could I use 13B water pump parts (bearing and
  impeller) and fit them into the original 20B WP housing?

  Jay


  It can be pressed apart and the bearings replaced with off the shelf
  bearings I am sure. You may need to make some tools to press it apart.

  It may be possible to just press the shaft down and out from the impeller
  side.

  A 13B front cover and pump may fit the 20B front end housing.
  I am not sure the 20B front end housing is different than a 13B
  front end housing. I could be wrong. My 20B is not apart
  so it is hard to tell.

  Paul Lamar

  3) Anyone know parts numbers for the water and oil pumps from the 20B or
  maybe a supplier you've used that caries them?

  Jay


  Hi Jay;
  From what little I remember, the 20B's were somewhere between 2nd and
  3rd gen.
  A good place for used parts and information is rx7club.com. See also
  nopistons.com
  There are several forums you can search or post a want to buy thread:
  http://www.rx7club.com/forumdisplay.php?f=95
  http://www.rx7club.com/forumdisplay.php?f=99

  http://www.mazdamotorsports.com

  You can supposedly still order Cosmo/20B parts through your Mazda
  dealer. Some people seem to have a full Cosmo parts fiche. See this
  thread for hints (I should have bought that car):
  http://www.rx7club.com/showthread.php?t=788077&highlight=cosmo

  Some of the engine parts are here:
  http://cp_www.tripod.com/rotary/pg20.htm
  Cosmo:
  http://cp_www.tripod.com/rotary/pg09.htm

  possibly:
  http://www.partsnet.com.au/members.html

  Cheers
  Cary

  Paul,
  Here are some photos of the original water pump and housing side by side
  with the one I got from Atkins. I also included one of the front end
  housing. The oil pump is going to fit. So for now I'm just dealing with
  the
  water pump issue. Dan at Atkins suggested an 86'-91' pump and housing
  would
  fit the 20B without any fabricating or cutting. Can you corroborate this?

  Thanks
  Jay

  Your original pump is fine Jay. No need for the 3rd gen cartridge besides
  the
  that fact that it does not fit the 20B water pump housing. I'll take a
  closer look at my
  20B out in the hangar and see if I can find any disadvantages to sticking
  with the
  original pump.

  You may have to cut it down to fit under your cowl but that would be true
  of a 2nd or
  3rd gen water pump housing as well.

  Paul Lamar

  The front cover looks unique to the 20B but I am not sure. Mainly in the
  area of the oil drain back for the sequentially turbos.


  Please take a picture of the front cover both from the front and rear so
  we
  can tell if it will fit a 2nd gen water pump housings. Also please take a
  picture of the 20B front end housing from the front.

  The cartridge Dave Atkins sent you is a 2nd gen 8 bolt version. In order
  to
  use that you would need a 2nd gen water pump housing which may or may not
  fit your front cover.

  The only drawback I can see sticking with the 20B WP pump is the
  difficulty in finding a new cartridge if it develops a leak or the
  bearings
  go out. They can be pressed apart and the bearings replaced but that is
  what
  most people don't do. They just replace the cartridge.

  Paul Lamar


  Paul,
  The 13b water pump housing will fit on the 20b, but the 13b's impeller is
  smaller. Also, the Renesis water pump (removed from the front cover) will
  also fit the 20b. The Renesis entire front cover will fit, but it requires
  some machine work for it to clear the 20b front counterweight which
  is larger than the Renesis' counterweight and it interferes with some of
  the
  front cover casting. If you machine it for adequate clearance, then you
  are
  into the bolt head recesses which then must be welded up, but by this
  point,
  we're probably beyond what most people would be willing to do for the
  limited benefits of the Renesis front cover. Also, the Renesis front
  cover
  has a different shape and spacing around the oil pan. Not a problem if
  you're building a custom oil pan anyway. The easiest route is to cut the
  Renesis pump housing from the front cover (if you want to run the Renesis
  water pump).

  Who was it that commented about removing and replacing the 20b exhaust
  inserts. Having gone down that road, my recommendation is DON"T DO IT
  unless you're planning on turbo-charging your engine. I changed out the
  20b
  exhaust inserts for 13b turbo inserts. Now I'm pulling my hair out trying
  to get a muffler that will handle the torture of the rotary's exhaust and
  still quiet things down. Word has it that the splitter inserts are good
  for a 5db noise reduction. I constantly get the comment from people that
  they can hear me coming long before they can see me. Not exactly the
  image
  I want to portray. You can be sure that my new engine will retain the
  stock
  exhaust inserts.

  Mark S. Texas

  Are you talking about removing the RX8 engine water pump housing from the
  RX8 engine front cover? In other words sawing it off? That sounds like a
  good idea except for the cost of an RX8 front cover.

  The RX8 WP cartridge will not fit the 20B water pump housing.

  Paul Lamar


  Paul,

  If you don't want to go through the trouble of machining an RX-8 front
  cover
  to fit the 20B, you can saw off the water pump housing and use that on the
  20B, along with the RX-8 cartridge. This would necessitate using the 20B
  front cover. The benefit to using the Renesis front cover would be for the
  crank mounted CAS arrangement.

  Mark S.
  Austin

  Given the trouble you had with the RX8 CAS and if you have a 20B
  crank angle sensor you might as well stick to it. Less to do.

  Paul Lamar


  Paul,

 True, but if you're of the "less to do" crowd, you would probably just buy
 an flying airplane. ;-)

 Mark in Austin

 I am just trying to make it quicker and easier :)

 Paul Lamar



Yes, understand.  My initial reason for switching to the crank-mount CAS was
to drop a few pounds off my installation.  Eliminating the old style CAS
would save a pound.  And switching from the 20B water pump to a Renesis pump
would save another 5 pounds (20 oz vs. 6.6 lbs).   I don't know if there's
any weight savings between the 20B front cover & water pump housing vs. the
integrated Renesis front cover/water pump housing.  But if someone wants to
spend a little time and money, there's some significant weight savings to be
found here.

Mark S.
Austin

Since that time a trip I took up to Steve Beckhams place in Oregon
revealed an aluminum 13B water pump cartridge that was new to me.
This saves a lot of that 5 pounds right there. I need to gather
up all the water pump cartridges I have lying around weigh them.

Perhaps some aluminum pulleys might save a 3 pounds or so.

Paul Lamar


-----------------------old message------------------
GMB is one of the big makers of after market water pumps and
u-joints..  Any auto parts place that sells GMB should be able to
order one for you.  It's listed on page 4 in their catalog here:

http://www.gmb.net/html/products/waterpumps/2009_WP_PictureBook02.pdf


Matt-
---------------------------------------------

Go here and download the full catalog to get the part numbers.
http://www.gmb.net/

Here are some part numbers.

Paul Lamar