Misc Electronics / barrier coat / reverse cool.

[Todd....!!]

Thanks for bringin us back to basics Robert!

I have been enlightened!

Where can ya pick up that coating stuff again?

Thanks!

Todd....!!

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Robert Harris wrote:
> 
> Not really.  Lets look at what happens.
> 
> Combustion - Third Edition.  Irvin Glassman - page  96
> 
> (1) Following ignition, the primary fuel disappears with little or no energy
> release and produces unsaturated hydrocarbons and hydrogen.  A little of the
> hydrogen is concurrently oxidized to water.
> 
> (2) Subsequently, the unsaturated compounds are further oxidized to carbon
> monoxide and water. Simultaneously, the hydrogen present and formed is
> oxidized to water.
> 
> (3) Finally, the large amounts of carbon monoxide formed are oxidized to
> carbon dioxide and most of the heat released from the overall reaction is
> obtained. Recall that the CO is not oxidized to CO2 until most of the fuel is
> consumed owing to the rapidity which the OH reacts  with the fuel compared to
> its reaction with CO."
> 
> Then one must note from the above or other references that the carbon monoxide
> to carbon dioxide reaction where most of the heat of combustion occurs
> essentially "freezes" around 700 c.  The longer the combustion remains above
> 700c, the more of the fuel that will be converted and the more heat that will
> be released.  Or another way to put it, when the temperature of the combustive
> gas drops below 700c, we essentially stop generating more heat (pressure) and
> live with what you have.
> 
> Of course the reaction still goes on - but at up to orders of magnitude slower
> rate.
> 
> Coating's reduce the heat loss "cooling" at the critical time around TDC, thus
> allowing more heat to be released in combustion and greater pressure to be
> made.  Note that the heat increase in not from the heat being returned to the
> gas by reducing the loss - but from more CO completing to CO2 and thereby
> releasing more total heat.
> 
> The majority of "cooling" occurs as the gas expansion transfers energy from
> the combustion gases to the piston.  Since the face of the exhaust valve is
> significantly cooler, LESS coolant is needed in the heads and more might be
> required in the block - thus negating any advantage of reverse cooling.
> 
> Previously he stated
> "and the fuel is consumed, to a major extent, before significant energy
> release occurs.  The higher the initial temperature, the greater the energy
> release, as the fuel is being converted"
> 
> Ceramic coating everything nicely increases the initial temperatures also by
> reducing heat rejection to the chamber.
> 
> This increase in ability to convert fuel to energy is at the heart of the air
> pollution war - as it after a certain temperature begins to dis-associate
> nitrogen and form nitrous oxide products as well.
> 
> Also to note - this book is primarily about combustion and it processes and
> most decidedly is not concerned with the otto cycle and carnot worship.
> 
> >
> >Date: Wed, 12 May 1999 19:56:40 -0400
> >From: "Bruce Plecan" <nacelp at bright.net>
> >Subject: Re: Misc Electronics / barrier coat / reverse cool.
> >
> >Just for grins, we barrier coat the piston domes
> >the intake valve face, the exhaust valve face.
> >In theory then we have captured more heat to be recovered by the movement of
> >the piston, right??.
> >Now that we have with held this higher heat, for a longer period of time,
> >then more
> >heat is put into the top of the cylinder bores, right.....
> >  The cooling system was designed so that the exhaust valve seat area is the
> >"hot spot",  so don't we now have to "reverse" cool the engine to get the
> >max effectiveness out of this??..
> >grumpy
> >
> 
> 1963 Ford C-600 Prison Bus Conversion "Home"
> 1971 Lincoln Continental 460 "Christine"
> 1972 "Whale" Mustang awaiting transplant
> 1978 Dodge Long Bed Peeek Up "Bundymobile"
> 
> Habaneros - not just for breakfast anymore