[SEL] Attention Aussies - Austral Question

[john palmer]

Hi, I have in my Blackstone engines Made a tube of perforated stainless open 
at both ends packed it  tight with stainless swarf type shavings from a 
comercial scouring pad,and put it in the lower chamber. They both run very 
well for some hours.  In my experiance most low compression lamp starts cool 
off.  Thank goodness for Dr.Diesel   John Palmer


>From: Rob Skinner <rskinner at rustyiron.com>
>Reply-To: The SEL email discussion list <sel at lists.stationary-engine.com>
>To: stationary-engine at oldengine.org
>CC: Stationary Engine ATIS List <sel at lists.stationary-engine.com>
>Subject: Re: [SEL] Attention Aussies - Austral Question
>Date: Thu, 8 Mar 2007 10:42:18 -0800
>
>On Mar 8, 2007, at 2:53 AM, Patrick M Livingstone wrote:
> > My engine is running its original mild steel primary coil but I do
> > not have a starting coil in the lower chamber. Some of the guys
> > have been
> > experimenting with various materials to try and stop the cooling
> > off problem
> > of an unloaded engine. Some have tried replacing the coil by
> > filling the
> > chamber with brass nuts.
>
>Ok Patrick.  You opened the can of worms.  I'm gonna fling 'em all
>over the place.  It might take the PhD or the Nukular Scientist to
>clean up the mess.
>
>I contend that changing the material or the configuration of the
>material is utter bollocks.
>
>Consider the stock coil.  When the engine fires, the coil TAKES heat
>from the fire depending on a heat-exchange coefficient.  Then over
>the "miss" cycles, the coil gives up heat using the same
>coefficient.  Eventually there is a compression stroke, and the coil
>will still be giving up heat using the same coefficient.  The rate of
>heat exchange for a particular coil is dependent on the pressure in
>the coil case and composition of the gas in contact with the coil.
>These will be constant independent of the coil.
>
>If we change the composition of the coil or the surface area of the
>coil, we can affect the rate of heat exchange.  BUT, if the coil
>TAKES heat more quickly, it will COOL OFF more quickly.
>
>Furthermore, the mass of the coil is what, three grams?  The mass of
>the entire vaporizer is what, a couple kilos?  The mass of the coil
>is miniscule compared to the entire mass of the vaporizer.  The
>surface area of the coil compared to that of the entire vaporizer is
>equally miniscule.  Futzing around with the coil is an exercise in
>futility.
>
>There you have it.  The Emperor has no clothes.
>
>Rob
>All enraged Roo Eaters, please send your complaints to
>helen at insulate.co.uk
>
>
>
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