[Diy_efi] Re: Diy_efi Digest, Vol 21, Issue 19

[Bill Washington]

Gents,
    What about using an ultrasonic fogger instead of heat to produce a 
vapour?

Regards
Bill

>
> Subject:
> [Diy_efi] Evaporative fuel injection (evolution of the evap carby)
> From:
> "Ben P" <benof1987 at hotmail.com>
> Date:
> Wed, 22 Nov 2006 20:11:21 +1000
> To:
> diy_efi at diy-efi.org
>
> To:
> diy_efi at diy-efi.org
>
>
> Hi people, after reading through all of the 'instant fuel economy' 
> sites I could find on the net (except stuff like hi-clone), I thought 
> of an idea I would like you guys to have a think about (and then go on 
> to poke the s*** out of it). Also, whats the deal with these carby 
> mesh systems? My dad's telstar (aka Mazda 626) had a heated mesh under 
> the carby, and it went like a cut snake, but I am unsure of fuel economy.
>
> Evaporative Carby Evolution
>
> The typical evaporative carby heats the fuel to a gas, which then 
> mixes with the air-stream better than a conventional jet/discharge 
> nozzle combination would. One major advantage of this type of 
> carburettor (apart from apparently huge economy benifits, which would 
> be there, but maybe not so dramatic) is the ability to run on pretty 
> much any hydrocarbon fuel, this includes (filtered) used crank case 
> oil, if the carby heats enough. The only real disdvantages of this 
> carby are a loss of power (hot air tends to do that), and if the carby 
> isnt heated enough, 'lighter' parts of the fuel go first (giving an 
> impression of huge mileage), then the heavier parts boil much later, 
> giving
>
> My idea involves feeding fuel to a heated block (200-300 degrees, 
> maybe hotter depending on fuel), which would effectively instantly 
> boil all of its components and feed the fuel vapour into the intake 
> stream, prefferably in a multipoint configuration. The fuel going to 
> the heated block would be controlled by a pulsed valve much like an 
> injector, but just controlling flow, not spraying the fuel as well 
> (proper design of the heated block should negate the need for that).
>
> As an addition, water could also be added to the block to keep it 
> clean, prevent detonation, and keep the engine clean. Although this 
> would mean the blocks would need more heat input to mainain the same 
> temperature.
>
> The only disadvantages I can see apart from the slight loss of power 
> are a high current draw (if the blocks are electrically heated, the 
> only way to get them hot on a cold start), and if the blocks are not 
> electrically heated, the problem of what to do while the engine is 
> cold (before the exhaust manifold gets hot enough to draw heat from.
>
> thoughts people?
>
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