Tom; et al,
The 12A front cover fits the 20B without
modification; does have a bit different bolt pattern for the pan. It
allows some different pump choices and gives a lower profile than the stock
cover. I then went to the Mazda parts department and looked through parts
lists at the exit necks (thermostat housing cover) for various models, and
picked one with low profile. I don’t know the model years of either
the pump or the exit neck.
Don’t know that this meets your
requirements – photos of my setup attached.
Al
P.S. Also note that the timing point on
the 12A cover is not consistent with marks on 20B pulley.
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf
Of Mark Steitle
Sent: Wednesday, May 04, 2011 8:43
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: water
pump housing
You are correct that the Renesis front cover can be
made to fit on a 13B/20B, but the pan bolts are a different pattern which will
require modification to your oil pan. Also, the 20B front counterweight
is larger than the Renesis causing the cover to interfere with
the 20B's front counterweight. Material will need to be
milled out for the cover to fit, but in doing that, you will end up
cutting through the cover which will require tig welding the holes.
Finally, the RX-8 front cover is heavier than the 13B/20B front cover with
Renesis water pump. Personally, I don't see an advantage to using the
Renesis front cover.
Mark S.
(Been there, done that.)
On Wed, May 4, 2011 at 11:11 AM, Kelly Troyer <keltro@att.net> wrote:
One additional
thing comes to my mind...........I do not have a RX8 Renesis front side
housing (cast iron) but from all of
my research of photos I am fairly confident that the
RX8 front housing (aluminum) will
bolt directly to the 93-95 13BREW and Cosmo 13B
and 20B with some minor mods
(to possibly clear bolt heads on the 20B front side hsg)
and the drilling and threading
of 1 to 3 existing bosses for 8 mm x 1.25 studs or bolts..