[SEL] Attention Aussies - Austral Question

[Edd Payne]

OK.So When I replaced my ign coil in my Austral to a 22g one from the 
original and it will now run all day without a lamp under it and before it 
wouldn't and all of us Ozies that do the same or use stainless steel mesh 
are having our selves on.I also did the same to my 8HP Blackstone and it 
also ran all day without external heat.Also try getting a piece of 22g steel 
and apply heat.Then get a piece of 8g steel and apply heat.See which gets 
hot faster.Also the Austral is generating heat all the time by compression 
and this aids in keeping the ign area hot on idle strokes.They don't 
decompress on idle strokes like a normal hit miss they do it by the fuel 
valve not opening and letting in fuel.
EDD PAYNE
PO Box 364 Gulgong N.S.W
Australia
2852
Phone:0263742387
edsengns at optusnet.com.au
edsengns
----- Original Message ----- 
From: "Rob Skinner" <rskinner at rustyiron.com>
To: <stationary-engine at oldengine.org>
Cc: "Stationary Engine ATIS List" <sel at lists.stationary-engine.com>
Sent: Friday, March 09, 2007 5:42 AM
Subject: Re: [SEL] Attention Aussies - Austral Question


> 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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