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

[Mike]

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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