[Diy_efi] Early Gasoline Fuel Injection

[Mike]

Wasn't it also used on German 'U' boats along with sequenced
full load cylinder cycling, double ended headless bores
and water injection - around 1941 ?

EFI was mostly feasible due to power transistors - not to
microprocessors (although they help a great deal with precision),

There are a few analog only EFI systems, the analog processing
could have been done shortly after the first germanium
transistors - but it was only due to driver transistors which
could operate solenoids at any sort of rate (and cost) before
EFI controllers started to become really viable - micros are
a sensible and logical progression from perspective of implementing
algorithmic complexity etc,

rgds

mike

At 01:03 PM 4/8/2002 -0500, you wrote:
>Mechanical fuel injection was used on WW II German 
>aircraft and was an option on some late 50s GM engines.
>Cadillac used a solid state electronic FI system on some 
>cars starting with the 1975 500 engine.  All the above 
>systems were analog in operation; in 1980 Cadillac 
>switched over to a digital computer controlled EFI. 
>
>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.  
>
>Rumor has it a vacuum tube based EFI system was 
>fielded in the 50s; I've never seen any substantiation of 
>this.  In fact I've never seen ANY kind of portable vacuum 
>tube system with remotely the computing power of the  
>solid state systems mentioned above.  Another mechanical
>FI system with a tube thrown in as an amplifier somewhere 
>I could believe.
>
>Bruce Roe
>
>On Sun, 04 Aug 2002 02:00:37 -0400 Shannen Durphey 
><shannen at grolen.com> writes:
>> Check archives for bendix efi released in '50s.  Yes, that's 
>> E as in Electronic (although it's really vacuum tubes).
>> 
>> Shannen
>> 
>> Bobby Riggs wrote:
>> > 
>> > Actually the first EFI (electronic, by way of
>> > transistors that is) was mounted to the 68 and
>> > later Volkswagon Fast/Square/Notchbacks. Was
>> > revised and rereleased in 68 for the Type 4
>> > fast/square backs.  If you want to go WAAAAY back
>> > there were systems by GM for the Caddy's and
>> > Corvetts from '54... They were mechanical, then
>> > there was Hilborn.  To say they came out at 1970
>> > is more like "EVERY car had EFI" by 70 if it came
>> > from Germany.
>
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