[Diy_efi] Early Gasoline Fuel Injection

[Dave Williams]

bcroe at juno.com wrote:
> 
> Mechanical fuel injection was used on WW II German
> aircraft

 Mechanical fuel injection was used on WW *I* German aircraft - Kaiser
Wilhelm's Zeppelins bombed London and parts of France and Belgium.  They
used direct injected Maybach Diesels.



> The complex EFI systems used today were made possible
> by the invention and evolution of the microprocessor in
> the 70s.  The micro in turn depended on the invention of
> the integrated circuit in the 50s and the individual transistor
> before that in the 40s.

 William Shockley, Fairchild Corp., the United States Air Force Missile
Command, and Carroll Killebrew of Texas Instruments, who put the pieces
together to make the first integrated circuit.


 
> Rumor has it a vacuum tube based EFI system was
> fielded in the 50s; I've never seen any substantiation of
> this.

 I have pictures of the Bendix Electro-Jector system from the 1950s,
using vacuum tubes.  It was a proof-of-concept system only; it filled
most of the passenger side floorboard and took several minutes to warm
up.  It was all breadboard stuff, but it's doubtful they could have got
the size down by even half, given the vacuum tubes and discrete
components of the day.

 Bendix, in a typically American corporate self-lobotomy, sold the whole
package, patents, licenses, prototypes, and all, to Robert Bosch GmbH in
the early '60s, just about the time transistors were becoming cheap and
readily available.  The Bosch D-Jet is the same old Electro-Jector,
except solid state.
Most fuel injectors even today, half a century later, still conform to
the size, shape, and design of the electric injectors Bendix designed
for the Electro-Jector.

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