[Diy_efi] Evaporative fuel injection (evolution of the evap carby)

[mark krawczuk]

hi, when at   TAFE  college , there was a video of a guy that  had  high 
comppressed air mixing ?? in with the fuel injector to make the fuel 
atomise more .

mark k


----- Original Message ----- 
From: "Mike" <niche at iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Friday, November 24, 2006 2:08 AM
Subject: Re: [Diy_efi] Evaporative fuel injection (evolution of the evap 
carby)


> mmmm, I remember seeing a large fuel vaporisoring box atop a
> VL Commodore RB30 motor in a Sunday Times article about an
> Eastern States inventor/engineer so 13 years ago - any relationship ?
>
> Suffice it say, it achieved great emissions with no cat and the same
> or slightly better performance with substantial economy gains claimed
> of from 20 to 40% but never went further, does that sound familiar ?
>
> Rgds
>
> Mike
>
>
>
> At 11:14 PM 11/23/06, you wrote:
>
>>About 15 years ago I worked on a project that was based on the use of
>>exhaust heat to vaporize the fuel prior to it's "injection" into the 
>>manifold.
>>
>>Some results were as expected some were astonishing.
>>
>>The temperature needed to vaporize 100% of the fuel was in excess of
>>600 deg C.
>>
>>I know that we all know how easily petrol vaporizes but we
>>also know that if you look inside the inlet manifold of a vehicle with a 
>>high
>>degree of heat transfer from exhaust to inlet such as were being built
>>in the 70's and 80's there was invariably a thick gooey (technical term) 
>>sludge
>>under the carby.
>>
>>The physics were good but the engineering was bad. The engines were inline
>>4's and 6's with inlet and exhaust manifolds one on top of the other.
>>
>>The were technically bad in so many ways it doesn't pay to base any future
>>work on the results.
>>
>>On the other hand... the very complicated "injected" system was awesome 
>>for
>>it's clean burn and stability at 20:1 A/F ratio. It was capable of single 
>>digit
>>HC
>>reading in the exhaust with no cat.
>>
>>What it did have was...
>>
>>An exhaust heat exchanger that had a volume of 3.5 litres
>>A fuel "dosing" pump to feed the heat exchanger
>>A vapour pump to move the vapour to the...
>>Vapour storage tank ( about 1 litre)
>>An independent control system to keep it all happy
>>An electric element that was about 1200 watts
>>A starting procedure that was as complicated as a nuclear (pronounced 
>>Noo-ku-la)
>>
>>    reactor.
>>A set of large and noisy injectors
>>A requirement to have intake and exhaust on the same side for packaging 
>>reasons.
>>
>>As we know things have moved on since then.  Although physics hasn't 
>>changed.
>>
>>The project was assassinated by the marketing and money people who wanted 
>>to
>>franchise the world with after market systems.
>>
>>If they had gone the OEM path they could have managed the costs much 
>>better
>>and had proper integration with the rest of the vehicle systems.
>>It may have gained some traction in 2nd world arenas such as India at the 
>>time.
>>
>>The US and OZ OEMs of course were already well progressed with planning 
>>their
>>L Jetronic + cat era. The European OEMs were already doing L-Jet on the 
>>more
>>expensive models.
>>
>>Phil
>>
>>
>>
>>
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