[NSRCA-discussion] OS Shadel piston/liner

[dwaynenancy]

And the bar stock is pure aluminum?  Dwayne

Dennis Cone wrote:

> To answer this question as to why they are different. Die cast 
> aluminum is blended with other materials to keep it from cracking. It 
> is not as dense as bar stock and as such cannot transfer heat as 
> efficiently as metal that has the molecules closer together. (Bar 
> stock). Try going to this link. They have a simple explanation that 
> most would understand.
>
>  
>
> http://www.efunda.com/processes/metal_processing/die_casting.cfm
>
>  
>
>  
>
> Dennis Cone 
>
>  
>
> -----Original Message-----
> *From:* nsrca-discussion-bounces at lists.nsrca.org 
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]*On Behalf Of *Dave 
> Burton
> *Sent:* Monday, March 06, 2006 4:23 PM
> *To:* NSRCA Mailing List
> *Subject:* Re: [NSRCA-discussion] OS Shadel piston/liner
>
>  
>
> I don't know why the density of a certain aluminum alloy (6061, etc) 
> would be different if die cast or extruded. It's the same material.
>
> But then again, I'm old and so is my metallurgy knowledge
>
> Dave Burton
>
> -----Original Message-----
> *From:* nsrca-discussion-bounces at lists.nsrca.org 
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]*On Behalf Of *Ed Miller
> *Sent:* Monday, March 06, 2006 7:14 PM
> *To:* NSRCA Mailing List
> *Subject:* Re: [NSRCA-discussion] OS Shadel piston/liner
>
> I could be wrong but it is my understanding the machined type heads 
> are made from bar stock, not die cast material.  The greater density 
> of the bar stock material should transfer heat more efficiently than a 
> die cast piece. It is true in racing applications one used to polish 
> the piston tops and combustion chamber to aid in maintaining heat in 
> the combustion chamber ( now there are coating for this ) as well as 
> ward off carbon deposit build up.  I think the difference is the 
> ability for a given material to absorb and transfer heat versus the 
> way a surface finish radiates heat.
>
> Ed M.
>
> ----- Original Message -----
>
> *
> From: Dave Burton <mailto:burtona at bellsouth.net>
> *
>
> * *
>
> **To:* NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org> *
>
> **Sent:* Monday, March 06, 2006 5:49 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> 
> [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 <mailto:edbon85 at charter.net>
> **
>
> ** **
>
> ***To:* NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org> **
>
> ***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 <mailto:pattern4u at comcast.net>
> ***
>
> *** ***
>
> ****To:* NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org> ***
>
> ****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 <mailto:d.pappas at kodeos.com>
> ****
>
> **** ****
>
> *****To:* randy10926 at comtekmail.com <mailto:randy10926 at comtekmail.com> 
> ; NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org> ****
>
> *****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 <mailto:d.pappas at kodeos.com> ****
>
> ****-----Original Message-----
> *From:* nsrca-discussion-bounces at lists.nsrca.org 
> <mailto: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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