The series 4 had cooling problems as the water traveled through

the

 engine too fast, there is a vast difference in output hp and the

series

 6

 of mine runs cool even in high temps over high speed hours of

running.

 The aluminum water pumps on series 4 and 5 are an after market

supply

 and cost around $90 Aus.
 Regards Don

 Sure is a bargain on those Aluminum after market pumps.  Only US

source I

saw

 wanted $500.00 for an aluminum pump cartridge.  I wouldn't mind

having

one

 of those series 4 jobs.  Anyone else interested?
 Tracy Crook
 tcrook@rotaryaviation.com
 www.rotaryaviation.com

I'll bring one back  in my check on :-)
Paul Lamar

As he says, the FD series (93+ usa cars, 13Brew tt) all have the alum
pump bodies/cartridges. I remember the 91 I rebuilt had that black steel
pump. You may be able to find these 93+ much cheaper on the after market
rebuilt (try Napa), or from removed or discarded FD engines. Mazda
replaces the pump on their factory FD rebuilds, I know for a fact.
(Intimate knowledge of wife's car engine!).

Tracy, the 20B has what kind of pump? Never mind who would supply a
replacement (Mazda racing?)! The volume must be higher, and what else is
different? Anyone know?
Marc Wiese

As I recall the 93 13B and later pumps won't fit the 92 13B and earlier.
For one thing they use a poly V belt and rotate opposite as I recall.
I am interested in a 92 and earlier 13B aluminum cartridge. Is that what
we are talking about here?
Paul Lamar

Hi Paul ,
You are right that the pump turns in the opposite direction and series 6 are standard aluminum housings.

The series 6 pump will fit pre 1993 engines though the studs need to be longer.
I have tried to locate pre 1993 aluminum housings water pump today and all the after market people tell me they are now being made to Mazda original spec with cast steel.
I will try and locate some more.
Don Dunbar

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site. Copyright 1998-2002 All world wide rights reserved.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org