[NSRCA-discussion] OS Shadel piston/liner

[Steven Maxwell]

 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.
 Steve Maxwell


----- Original Message ----- 
From: Dave Burton 
To: NSRCA Mailing List
Sent: 3/6/2006 5:51:11 PM 
Subject: Re: [NSRCA-discussion] OS Shadel piston/liner


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.
Of course my thermo and metallurgy courses were a long time ago.
Dave Burton
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Bill Glaze
Sent: Monday, March 06, 2006 4:42 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] OS Shadel piston/liner


Ed:
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. 
Bill Glaze
----- Original Message ----- 
From: Ed Miller 
To: NSRCA Mailing List 
Sent: Monday, March 06, 2006 4:14 PM
Subject: Re: [NSRCA-discussion] OS Shadel piston/liner


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. 
Ed M.
----- Original Message ----- 
From: Grow Pattern 
To: NSRCA Mailing List 
Sent: Monday, March 06, 2006 10:42 AM
Subject: Re: [NSRCA-discussion] OS Shadel piston/liner


Randy,
             Said another way, if you lose a plug on a twin head, the engine goes lean and usually get very hot :-(  

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 :-)

Eric.
----- Original Message ----- 
From: Dean Pappas 
To: randy10926 at comtekmail.com ; NSRCA Mailing List 
Sent: Monday, March 06, 2006 10:31 AM
Subject: Re: [NSRCA-discussion] OS Shadel piston/liner


Hi Randy,
Mintor parts are available from Aeroslave. 
I find that the twin plug head is not absolutely necessary, but it widens the nneedle valve sweet-spot: in the rich direction.
Dean

Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Glenn Hatfield
Sent: Monday, March 06, 2006 9:23 AM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] OS Shadel piston/liner


Where do you get the mintor head?

Does the dual plug really help any?

Randy


--- ronlock at comcast.net wrote:

From: "Ron Lockhart" <ronlock at comcast.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Subject: Re: [NSRCA-discussion] OS Shadel piston/liner
Date: Fri, 3 Mar 2006 17:37:30 -0500


http://www.pspec.com/

Ron Lockhart
.org/mailman/listinfo/nsrca-discussion



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