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Old 07-01-2009, 05:36 PM   #27 (permalink)
naturalextraction
naturalextraction
 
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"Even then, most gasoline engines still send unburnt fuel down to the cat to be burned."

Sorry but this statement is inaccurate. Not entirely wrong, just inaccurate. Please understand I'm not being critical. Only in older cars was there an issue of actual gasoline particulates/ molecules that could still combust after exiting the exhaust chamber. All the fuel is "burnt" in the chamber on most any normally running fuel injected system by today's currant design. This is a misnomer from past systems. A catalytic converter is a device using a "catalyst" which entails platinum, palladium, and or rhodium, to change the exiting hydrocarbon emissions to a more neutralized chain lowering NOX and high Co2. The byproduct from most current designs is actually a larger percentage of H20. These are current bouts of information that currently mechanics receiving an SAE certification must know and learn to quantify through traditional computations.
A lot of misinformation exists. After reading the Wikipedia I realized it can be mis-understood to some degree if one is not more familiar with considerable detail to currant SIE or basic ICE combustion and breakdown of variations of C8H18 based fuels. The utilization in terminology regarding "fuels" "gas" and "gasoline" have very distinct outputs in any equation related to ICE or basic SIE's. Thus most of the terminology gets mis-appropriated and from a technical stand point, through further conversations, becomes confusing or simply wrong from a technical level. So simply know that a "gas" is from the lighter elements as Methane, CH4 and others related to Naphtha with in the hydrocarbon chain from C4,5,6 & 7 to liquid "fuels" such as gasoline, diesel and Kerosene. Gasoline typically being at about C8H18.
Not at all trying to be an ass, but to help clarify terminology that just leads to confusion in an area where most people would like to know more about in order to make significant changes when it comes to understanding mileage gains from the ICE side.
Here is some information that better illustrates the complexities of the combustion process as related to thermal release from the fuel and related to ICE and related to complete burn of the fuels utilized:
Influence of a Combustion Parametric Model on the Cyclic Angular Speed of Internal Combustion Engines. Part I: Setup for Sensitivity Analysis - Energy & Fuels (ACS Publications)
Here's information related from an engineering forum showing their debates via quantification related (initially they are talking about a compressed gas related to ICE,but change relations to gasoline ICE):
Engine & fuel engineering - water + hot gas + cilinder = ?
A lot of very well written and detailed papers have to be bought, which is really unfortunate, but I listed this one regarding "Effect of Engine and Fuel Variables on Liquid Fuel Transport Into the Cylinder in Port-Injected SI Engines" by Dr. John Heywood from MIT anyway. It's a very good explanation:
Effect of Engine and Fuel Variables on Liquid Fuel Transport Into the Cylinder in Port-Injected SI Engines

Last edited by naturalextraction; 07-01-2009 at 08:13 PM..
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