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From: keltro@att.net (Kelly Troyer)
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Report on underdriven Waterpump pulley 
Date: Sun, 27 Mar 2005 05:53:02 +0000
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Kevin,
   Do not know what you mean by "motorcycle stuff"......."Star Racing" website 
only has info about their "Mazda" powered race cars including photos of 
complete engines showing the oversize waterpump pulley in question installed .
  Would be your call whether toothed belt pulleys are better........I am  sure they
would be more expensive.......The "Star" WP pulley is 5 inches in diameter and
sells for $74.32 + UPS shipping.......The "Racing Beat" eccentric shaft pulley
that must be used with it approx. 3.875 inches in diameter and sells for $65.00
+ shipping from "Mazdatrix".......This pulley combination provides a underdrive
ratio of .775 to 1 (22.5 % reduction).........7000 engine rpm = 5425 waterpump rpm.
  The stock "Mazda" pulleys provide a 16 % overdriven ratio of 1.16 to 1........
7000 eng. rpm = 8130 wp. rpm.......This is well past the demonstrated cavitation
point of 6500 to 7000 rpm........The "Racing Beat" pulley used with the stock
waterpump pulley (about 1 to 1 ratio) works well for the guys using the 2.17 
redrive as they usually operate between 5000 and 6000 rpm which is below the
cavitation rpm.......The guys using the 2.85 redrive are seeing cruise rpm of
6500 and up.......Ed Anderson has seen 6800 rpm at last report and Tracy has
seen well over 7000 rpm racing.......So IMHO those with the 2.85 redrive need
to slow down the waterpump both for efficiency and reliability reasons !!
  Photo attached are "Star Engines" with both these pulleys installed.......I did
not ask "Star" if they sold the eccentric shaft pulley as I already had one......They
probably sell both.......I call it a "Racing Beat" pulley because they developed
it and I believe supply then to other dealers such as " Mazdatrix" and Probably
"Star" also........You might check to see if "Star's" price is better........FWIW

Kelly Troyer

http://mazdatrix.com/b9.htm

http://www.starmazda.com/starcars/index.html


Kelly - I couldn't find the pulley, just motorcycle stuff.  what will a set cost and how much reduction will it produce?  would a set of toothed pulleys cost more, or be better?
Kevin Lane  Portland, OR
e-mail-> n3773@comcast.net


-------------- Original message from keltro@att.net (Kelly Troyer): -------------- 


Ed and All,

Ok guys here is the straight skinny !! Received the "Star Racing" pulley
today (ordered Monday the 21st).......It is a beautiful piece of machine work
(obviously CNC), hard anodized in black and a perfect match for the eccentric
shaft pulley from "Racing Beat" that most of us use.......Perfect fit on the 86 to
88 13b pump with the 17 mm pilot.......will be a simple job to bore to 19 mm for
those using the 89 to 91 or Cosmo 13b and 20B pump.......Looks just like the
attached PDF........Great service from the "Star" parts dept.........They are in
business to sell parts mainly to guys that buy their race cars........They did
not ask what type of vehicle I had but it might be wise to not mention that
ours are aircraft........Off road would be a prudent answer probably so as not
to dry up a parts source.......Price was $74.32 plus UPS shipping........Contact
"Star" at the following E-mail and phone #........FWIW

(PS- I asked  about a quanity discount.....They said their markup was not 
enough to allow it)

Kelly Troyer

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
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<DIV>Kevin,</DIV>
<DIV>&nbsp;&nbsp; Do not know what you mean by "motorcycle stuff"......."Star Racing" website </DIV>
<DIV>only has info about their "Mazda" powered race cars including photos of </DIV>
<DIV>complete engines showing the oversize waterpump pulley in question installed .</DIV>
<DIV>&nbsp; Would be your call whether toothed belt pulleys are better........I am&nbsp; sure they</DIV>
<DIV>would be more expensive.......The "Star" WP pulley is 5 inches in diameter and</DIV>
<DIV>sells for $74.32 + UPS shipping.......The "Racing Beat" eccentric shaft pulley</DIV>
<DIV>that must be used with it approx. 3.875 inches in diameter and sells for $65.00</DIV>
<DIV>+ shipping from "Mazdatrix".......This pulley combination provides a underdrive</DIV>
<DIV>ratio of .775 to 1 (22.5 % reduction).........7000 engine rpm = 5425 waterpump rpm.</DIV>
<DIV>&nbsp; The stock "Mazda" pulleys provide a 16 % overdriven ratio&nbsp;of 1.16 to 1........</DIV>
<DIV>7000 eng. rpm = 8130 wp. rpm.......This is well past the demonstrated cavitation</DIV>
<DIV>point of 6500 to 7000 rpm........The "Racing Beat" pulley used with the stock</DIV>
<DIV>waterpump pulley (about 1 to 1 ratio) works well for the guys using the 2.17 </DIV>
<DIV>redrive as they usually operate between 5000 and 6000 rpm which is below the</DIV>
<DIV>cavitation rpm.......The guys using the 2.85 redrive are seeing cruise rpm of</DIV>
<DIV>6500 and up.......Ed Anderson has seen 6800 rpm at last report and Tracy has</DIV>
<DIV>seen well over 7000 rpm racing.......So IMHO those with the 2.85 redrive need</DIV>
<DIV>to slow down the waterpump both for efficiency and&nbsp;reliability reasons !!</DIV>
<DIV>&nbsp; Photo attached are "Star Engines" with both these pulleys installed.......I did</DIV>
<DIV>not ask "Star" if they sold the eccentric shaft pulley as I already had one......They</DIV>
<DIV>probably sell both.......I call it a "Racing Beat" pulley because they developed</DIV>
<DIV>it and I believe supply then to other dealers such as " Mazdatrix" and Probably</DIV>
<DIV>"Star" also........You might check to see if "Star's" price is better........FWIW</DIV>
<DIV>&nbsp;</DIV>
<DIV>Kelly Troyer</DIV>
<DIV>&nbsp;</DIV>
<DIV><A href="http://mazdatrix.com/b9.htm">http://mazdatrix.com/b9.htm</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV><A href="http://www.starmazda.com/starcars/index.html">http://www.starmazda.com/starcars/index.html</A></DIV></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV class=signature id=signature>
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<DIV><FONT face="Comic Sans MS" size=4>Kelly - I couldn't find the pulley, just motorcycle stuff.&nbsp; what will a set cost and how much reduction will it produce?&nbsp; would a set of toothed pulleys cost more, or be better?</FONT></DIV>
<DIV><FONT face=Arial size=2>Kevin Lane&nbsp; Portland, OR<BR>e-mail-&gt; <A href="mailto:n3773@comcast.net" target=_blank lid="n3773@comcast.net">n3773@comcast.net</A><BR></FONT></DIV></TD></TR></TBODY></TABLE></DIV><BR>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">-------------- Original message from keltro@att.net (Kelly Troyer): -------------- <BR><BR><!-- BEGIN WEBMAIL STATIONERY --><!-- WEBMAIL STATIONERY noneset -->
<DIV></DIV>
<DIV>Ed and All,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Ok guys here is the straight skinny !! Received the "Star Racing" pulley</DIV>
<DIV>today (ordered Monday the 21st).......It is a beautiful piece of machine work</DIV>
<DIV>(obviously CNC), hard anodized in black and a perfect match for the eccentric</DIV>
<DIV>shaft pulley from "Racing Beat" that most of us use.......Perfect fit on the 86 to</DIV>
<DIV>88 13b pump with the 17 mm pilot.......will be a simple job to bore to 19 mm for</DIV>
<DIV>those using the 89 to 91 or Cosmo 13b and 20B pump.......Looks just like the</DIV>
<DIV>attached PDF........Great service from the "Star" parts dept.........They are in</DIV>
<DIV>business to sell parts mainly to guys that buy their race cars........They did</DIV>
<DIV>not ask what type of vehicle I had but it might be wise to not mention that</DIV>
<DIV>ours are aircraft........Off road would be a prudent answer probably so as not</DIV>
<DIV>to dry up a parts source.......Price was $74.32 plus UPS shipping........Contact</DIV>
<DIV>"Star" at the following&nbsp;E-mail and phone #........FWIW</DIV>
<DIV>&nbsp;</DIV>
<DIV>(PS- I asked&nbsp; about a quanity discount.....They said their markup was not </DIV>
<DIV>enough to allow it)</DIV>
<DIV>&nbsp;</DIV>
<DIV>Kelly Troyer</DIV>
<DIV>&nbsp;</DIV>
<DIV>From: "Star Race Cars Parts Department" &lt;<A href="mailto:fmparts@starmazda.com" target=_blank lid="fmparts@starmazda.com">fmparts@starmazda.com</A>&gt; <BR>To: "Kelly Troyer" &lt;<A href="mailto:keltro@att.net" target=_blank lid="keltro@att.net">keltro@att.net</A>&gt; <BR>Subject: Re: Waterpump pulley <BR>Date: Fri, 18 Mar 2005 21:03:33 +0000 <BR><FONT face=Arial size=2></FONT>
<DIV class=signature><FONT face=Arial size=2>Here is a couple of pictures with some approximate dimensions of our water pump pulley.</FONT></DIV>
<DIV class=signature><FONT face=Arial size=2>Our part # is 050-521and costs 74.32.</FONT><FONT face=Arial size=2>Please email back if your interested(include a fax# </FONT></DIV>
<DIV class=signature><FONT face=Arial size=2>if you have one)</FONT></DIV>
<DIV class=signature>&nbsp;</DIV>
<DIV class=signature><FONT face=Arial size=2>thanks</FONT></DIV>
<DIV class=signature><FONT face=Arial size=2>Jason Lindsey</FONT></DIV>
<DIV class=signature><FONT face=Arial size=2>Star Race Cars</FONT><FONT face=Arial size=2>Parts Dept.</FONT></DIV>
<DIV class=signature><FONT face=Arial size=2>(818) 686-3356</FONT></DIV></DIV>
<DIV class=signature id=signature>&nbsp;</DIV>
<DIV class=signature><IMG height=480 alt=../Images/157-5727_IMG.jpg src="http://www.starmazda.com/factory/star-tour/Images/157-5727_IMG.jpg" width=640 align=top></DIV><!-- END WEBMAIL STATIONERY --><!-- END WEBMAIL STATIONERY --><!-- END WEBMAIL STATIONERY --></BLOCKQUOTE>
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