Re: [DMCForum] It seems too simple.. Why has no one built it for production yet?

[Marc Levy <malevy_nj@xxxxxxxxx>]

It seems to me that the "why" is explained in the
patent... To better atomize the fuel..  Your correct,
that the injectors vaporize the fuel, but does it do a
good enough job??  If by pre-heating the fuel (with
excess heat energy from the exhaust of the engine) it
would atomize BETTER, then the engine can run leaner.

Current injection technology still has fuel in liquid
form entering the combustion chamber.  We know this,
because it is common for people to "richen" the
mixture if there is pre-detonation... the liquid cools
the combustion chamber.

After some more reading, It would seem to me that such
an engine would create more heat than current engine
technology.  It is possible that the gasoline engine
designs in use today would not be able to handle the
additional heat. It would probably burn up pistons
like crazy just as a regular "lean run" condition.

On your LPG conversions over there, do they use water
injection to try and recover the 20% loss of power?

Maybe if cars over here were as efficient as they are
in Europe.....



--- Martin Gutkowski <martin@xxxxxxxxxxxxxx> wrote:

> The simple question I asked when reading these
> patents is "why?"
> 
> Who decided that pre-heating the fuel to the point
> of vapourisation 
> would make for a more efficient burn? Seems to me
> you're wasting energy 
> heating it up to start with, and losing the energy
> released when it 
> transfers from a liquid to a gas.
> 
> Remember where petrol's concerned, the liquid
> doesn't burn anyway, the 
> vapour burns. Your injectors are atomising the fuel
> stream - making the 
> surface area of the droplets as large as possible
> encouraging 
> vapourisation. Once ignited, the heat and
> compression soon takes care of 
> the rest and you get the entire benefit of the
> expansion within the 
> combustion chambers.
> 
> Or look at LPG - commonplace over here now are LPG
> conversions. 
> Liquified Petroleum Gas, is a propane/butane mix and
> as the name 
> suggests, normally a gas. It's a liquid in a
> pressurised tank in your 
> car, then injected as a gas into your engine.
> Typically about 20% by 
> volume less efficient/powerful than petrol, but much
> cleaner so big tax 
> breaks from the government on the cost of the stuff.
> 
> I drive a direct injection diesel engined car. The
> principle is to 
> enable the fuel to be injected into the combustion
> chamber -already 
> under compression- to allow for the leanest possible
> burn, eliminating 
> the possibility of knocking. Fir interest, the
> primary fuel pump runs ar 
> 5000psi.
> 
> It occurred to me that you could do that with a
> petrol engine - if you 
> could inject direct to the cylinders, you could
> actually run a petrol 
> engine using compression ignition, allowing the lean
> running diesels 
> achieve. Turns out Alpha Romeo have done it, and
> they're notoriously 
> unreliable and run extremely hot. What a surprise!
> 
> Martin
> 



      
            
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