OK Guys,
If there is anyone still planning on using old
fashioned "V" belts and
a mechanical waterpump listen up.......After detailed analysis (with a
ruler
and calipers) I have found out that the "Star Racing" large diameter
water
pump pulley is 5 inches in diameter and is designed to be used with
the
reduced diameter "Racing Beat" excentric shaft pulley used by most
of
us with 13B rotary (86-91) vintage.......The "Star" pulley is the
largest that
can be used with the "Racing Beat" pulley and probably should be
considered
a must have item for those using the RD1C, 2.85 redrive and planning
on
extended running at or above 6500 rpm.......IMHO......The use of this
pulley will
keep the pump well away from its cavitation rpm and reduce the
power needed
to pull it at high rpm.......The "Star" pulley has a 17mm (.669in)
pilot which
fits the 86-88 13B waterpump.......If you have a 89-91 13B , 13B or 20B
Cosmo
pump its pilot is 19mm (.748in) which can be bored out
easily......Before
everyone runs out and buys one of these let me order one and verify
all
I have guessed about here........FWIW
Kelly Troyer
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2
-------------- Forwarded Message: --------------
From: "Star Race Cars Parts Department" <
fmparts@starmazda.com>
To:
"Kelly Troyer" <
keltro@att.net>
Subject: Re: Waterpump pulley
Date: Fri, 18 Mar 2005 21:03:33 +0000
Here is a couple of pictures
with some approximate dimensions of our water pump pulley.
Our part # is 050-521and costs
74.32.Please email back if your
interested(include a fax#
if you have one)
thanks
Jason Lindsey
Star Race CarsParts Dept.
(818) 686-3356
----- Original Message -----
Sent: Friday, March 18, 2005 10:54 AM
Subject: Waterpump pulley
I need a larger diameter waterpump pulley (dual
V-belt) for a 13B rotary. From
your website it appears that your "Star" engines have
what I need. What year
of pump are they designed to fit and how may I
obtain one ?
Thank You,
Kelly Troyer