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<DIV> I remember a guy when I had my Harley that polished the engine on a 74 shovel head that started over heating, he had to take it and have it bead blasted to get the tempature back down. Th pours in the cast or sandblasting increase the surface aera.</DIV>
<DIV> Steve Maxwell</DIV>
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<DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=burtona@bellsouth.net href="mailto:burtona@bellsouth.net">Dave Burton</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To: </B><A title=nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> 3/6/2006 5:51:11 PM </DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] OS Shadel piston/liner</DIV>
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<DIV><SPAN class=694424422-06032006><FONT face=Arial color=#0000ff size=2>I'm curious too Bill. Then same material should have the same heat characteristics. Surface irregularities from casting should have more effective surface area for greater heat loss.</FONT></SPAN></DIV>
<DIV><SPAN class=694424422-06032006><FONT face=Arial color=#0000ff size=2>Of course my thermo and metallurgy courses were a long time ago.</FONT></SPAN></DIV>
<DIV><SPAN class=694424422-06032006><FONT face=Arial color=#0000ff size=2>Dave Burton</FONT></SPAN></DIV>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Bill Glaze<BR><B>Sent:</B> Monday, March 06, 2006 4:42 PM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B> Re: [NSRCA-discussion] OS Shadel piston/liner<BR><BR></FONT></DIV>
<DIV><FONT face=Arial>Ed:</FONT></DIV>
<DIV><FONT face=Arial>Just wondered why the machined head would show better heat dissipation. We were always taught that an as-cast surface showed better heat dissipation because of the greater developed surface area. In fact, the "bad example" was the buffed and polished surface. It showed terrible heat characteristics. (Unless, of course, you were looking for heat retention.) The above assumes, of course, that the materials involved were similar or exactly the same. Not quarreling, just curious. </FONT></DIV>
<DIV><FONT face=Arial>Bill Glaze</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=edbon85@charter.net href="mailto:edbon85@charter.net">Ed Miller</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, March 06, 2006 4:14 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] OS Shadel piston/liner</DIV>
<DIV><BR></DIV>
<DIV>I'm not sure how one plug going out would cause the engine to go lean. At best having 2 plugs would cause the point of combustion to be a bit earlier OR ( what I believe ) would cause a slightly more efficient burn of the compressed air fuel mixture. Having 2 plugs also may ward off a sudden engine failure due to a blown glow plug. The real advantage in my book of the Mintor head is it is made from bar stock, not cast and therefore has a better thermal efficiency, it sheds the head of combustion quicker and better than the cast head. The lighter weight and second plug which may improve mid range are just a bonus. If I look back at older OS and YS engines, the more "high performance" versions of the same engine had machined bar stock heads. For example the YS61AR and the YS 61R, the AR having besides other improvements a machined bar stock head versus the 61R die cast head. </DIV>
<DIV>Ed M.</DIV>
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<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=pattern4u@comcast.net href="mailto:pattern4u@comcast.net">Grow Pattern</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, March 06, 2006 10:42 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] OS Shadel piston/liner</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Randy,</FONT></DIV>
<DIV><FONT face=Arial size=2> Said another way, if you lose a plug on a twin head, the engine goes lean and usually get very hot :-( </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Learned that one the hard way. Using two plugs to fix a rich spot transition on a pipe IMHO is at best a band-aid. Try it and see for yourself :-)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Eric.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=d.pappas@kodeos.com href="mailto:d.pappas@kodeos.com">Dean Pappas</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=randy10926@comtekmail.com href="mailto:randy10926@comtekmail.com">randy10926@comtekmail.com</A> ; <A title=nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, March 06, 2006 10:31 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] OS Shadel piston/liner</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=078432915-06032006><FONT face=Arial color=#0000ff size=2>Hi Randy,</FONT></SPAN></DIV>
<DIV><SPAN class=078432915-06032006><FONT face=Arial color=#0000ff size=2>Mintor parts are available from Aeroslave. </FONT></SPAN></DIV>
<DIV><SPAN class=078432915-06032006><FONT face=Arial color=#0000ff size=2>I find that the twin plug head is not absolutely necessary, but it widens the nneedle valve sweet-spot: in the rich direction.</FONT></SPAN></DIV>
<DIV><SPAN class=078432915-06032006><FONT face=Arial color=#0000ff size=2>Dean</FONT></SPAN></DIV>
<DIV> </DIV>
<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT face="Times New Roman">Kodeos Communications</FONT> <BR><FONT face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT face="Times New Roman"><A href="mailto:d.pappas@kodeos.com">d.pappas@kodeos.com</A></FONT> </P>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> <A href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</A> [mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Glenn Hatfield<BR><B>Sent:</B> Monday, March 06, 2006 9:23 AM<BR><B>To:</B> nsrca-discussion@lists.nsrca.org<BR><B>Subject:</B> Re: [NSRCA-discussion] OS Shadel piston/liner<BR><BR></FONT></DIV>
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<DIV>Where do you get the mintor head?</DIV>
<DIV> </DIV>
<DIV>Does the dual plug really help any?</DIV>
<DIV> </DIV>
<DIV>Randy</DIV>
<DIV><BR><BR>--- ronlock@comcast.net wrote:<BR><BR>From: "Ron Lockhart" <ronlock@comcast.net><BR>To: "NSRCA Mailing List" <nsrca-discussion@lists.nsrca.org><BR>Subject: Re: [NSRCA-discussion] OS Shadel piston/liner<BR>Date: Fri, 3 Mar 2006 17:37:30 -0500<BR><BR></DIV>
<DIV><FONT face=Arial size=2><A href="http://www.pspec.com/">http://www.pspec.com/</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ron Lockhart</FONT></DIV>
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