Chryslers Bendix Electrojector setup was the first electronic fuel injection in an automobile. The electronics were not up to the task at the time. They used paper capacitors, which were prone to failure, and they were prone to interference from outside sources. It used much of the same type of equipment as modern fuel injection, including a vacuum sensor, throttle position sensor and port fuel injectors for each cylinder. Motor Guide magazine from May 1957 has a good article on the system. It had been planned for AMC also, and that is what the article describes, but it is the same basic system used by Chrysler.GM’s system was mechanical, but still complicated. Not many mechanics knew how to work on it.Don
The technicalities of the Bendix FI unit are too esoteric for my understanding, but in layman's vernacular can someone explain why the Chrysler FI setups so spectacularly unsuccessful that they had to be dealer-substituted with carbs? I don't believe GM had the same challenge in their Chevs, Pontiacs, et alia, these cars are still running around today on their original FI units.Keith Boonstra-On Tue, Apr 3, 2018 at 5:38 PM, 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@yahoogroups.com > wrote:
Hi Carl, cannot thank you enough. From this, it started as vacuum tubes, then progressed in R&D to transistors , 4 generations were mentioned... Inferring from the operating description , actually a very simple thing electrically. They seem to be just adding varying amounts of resistors in a set of non linear sensors of ~ 5 parameters, in series, to an RC circuit that is controlling the injection pulse width. 20PSI rail, solenoid injectors(!); then a power amp, and a distributor to each probably 12 v injector..probably a roller contact. Same as today, in a way, but today a computer with look up tables is far more accurate today, than building curves into the sensors .. But ideas are perfect, 100 % on. Correct idea but immature technology has been the bane of leading edge thinkers from the first wheel!
I am hopeful one of us gets a real schematic. They were understandably holding the real workings secret when it was new..probably patents filed. Good ones I think!
Analog circuits are surprisingly resistant to spike noise, so probably not EMI as much as widely varying voltages on a generator system, severe temperature drift effects all over the device and the engine temp /outside temp etc…
Nice try, we give it A+
From: Carl [mailto:cbilter@xxxxxxxxx]
Sent: Tuesday, April 03, 2018 3:41 PM
To: John Grady; 'David Schwandt'; 'Allan'; 'chrysler300@xxxxxxxxxxxxxxx Club'
Subject: RE: [Chrysler300] F.I. D on e-bay
John, the attached might be helpful from an EE standpoint. The modulator (brain) was solid state. The system was inadequately shielded from EMI. Agree, wish we could find an actual schematic.
Carl
http://soyeur.pagesperso-orange.fr/Mopar/SAE%20paper%20on% 20Electrojector.pdf
From: 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300] <mailto:Chrysler300-noreply@yahoogroups.com >
Sent: Tuesday, April 3, 2018 12:07 PM
To: 'David Schwandt' <mailto:finsruskw@iowatelecom.net > ; 'Allan' <mailto:agmoon@xxxxxxxxx> ; 'chrysler300@xxxxxxxxxxxxxxxx Club' <mailto:Chrysler300@yahoogroups..com >
Subject: RE: [Chrysler300] F.I. D on e-bay
Really interesting what a real FI car might get. Even if an obvious wreck now….gotta like the Ford blue hemi and yellow wires, spliced radiator hose. . .Wonder if he has the FI unit in an old box?? I have tried for years to get a wiring diagram of what was in them, how they worked, EE hat on .Really curious. Heard they had vacuum tubes, that would be something. Old enough to know about those, aka Philcojohn .That would mean a vibrator power supply in 57. Maybe very early transistor stuff. Bendix had mil connotations……
Does VIN id a fuel car in any way? Probably had a unique distributor to pick up needed signals…
From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@yahoogroups.com ] On Behalf Of 'David Schwandt' finsruskw@xxxxxxxxxxxxxxx [Chrysler300]
Sent: Tuesday, April 03, 2018 10:44 AM
To: 'Allan'; chrysler300@xxxxxxxxxxxxxxx Club
Subject: [Chrysler300] F.I. D on e-bay
https://www.ebay.com/itm/202278640078?ul_noapp=true <https://www.ebay.com/itm/202278640078?ul_noap%20p=true&rmvS > &rmvSB=trueB=true
Roster shows it is/was John Follie’s car, the junkyard guy in Williams, CA that is on the Forward Look site a lot.
I have sold him a few parts in the past.
[Non-text portions of this message have been removed]
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