Combustion - was Re: Propane EFI

[Don.F.Broadus at ucm.com]

Are you the same Padgett that had articles in several Pontiac magazines ?

> -----Original Message-----
> From:	Padgett 0sirius [SMTP:padgett at gdi.net]
> Sent:	Saturday, February 27, 1999 5:15 PM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Combustion - was Re: Propane EFI
> 
> Uh folks, as far as energy per gallon is concerned, gas is gas, it is
> all the same. What octane measures is how fast it burns and to a lesser
> extent ignition pressure. Higher octane gives slower burning & more
> resistance to "spontaneous combustion". The secret to a SI engine is
> controlled combustion. Since the pressure rise is not instantaneous
> mechanical spark advance is needed. Since the burn rate varies with 
> chamber pressure, you also need vaccuum advance. The goal is for peak
> cylinder pressure by about 10 degrees ATDC (varies a bit with engine
> geometry). This will vary for any fuel used.
> 
> Might I suggest review of chapter 1 "Combustion" in Ricardo's "The High
> Speed Internal Combustion Engine" ? Is better than Obert.
>       	A. Padgett Peterson, P.E. Cybernetic Psychophysicist
>  Anti-Virus, Cryptographics, & Antique Radio Researcher
> http://www.freivald.org/~padgett/index.html
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