Snip

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

I'm looking for the aluminum pump cartridge

that fits 89 - 91 13B for the

engine on my RV-4, which I think is the series 4.

I'm not sure what my 20B

needs since it is a bastard engine composed of

all sorts of assorted parts.

But I do think the front sidehousing is an actual

20B part.  I have a water

pump for it (large diameter impeller) but it is an

iron cartridge.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

      Tracy in your copious free time would you

compare the impeller of your

 20B pump to 13B(diameter,etc.)and report same?

      Paul my 13B Cosmo pump is not Kubota like

93+ 13BREW(series 6 down under).

 The 13B Cosmo pump is same as 89-91 13B

(standard rotation) using poly-V belt

 as previously posted.

     Kelly Troyer

Are you sure about the belt routing?

Paul Lamar

My 13B Cosmo came with serpantine belt puley's.
Bulent

Same thing.
Is the pump driven off the back side of the belt?
Is the pump pulley smooth or does it have grooves?

Paul Lamar
 
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