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Old 10-26-2011, 08:21 PM   #1
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Electronic lean burn system

Found this under my dads work bench. I thought ide post it on e-bay see if some one trying to restore an old classic car would want to keep things original.

Part i think is weird is why would you want the car to run lean? If i remember my mom at one time had a 78 chrysler cordoba with a big 400 in it and i think my dad took this off it. Car always reminded me of something from a stephen king movie.




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Old 10-26-2011, 09:36 PM   #2
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Doing some research it was actually the electronic way to control timing in a carbureted engine. Looks like is uses early versions of sensors like the TPS, IAT and coolant temp....pretty nifty system for the 70's.

Watch this old school Chrysler Instruction Video on how the system works: CLICK!
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Old 10-26-2011, 11:10 PM   #3
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Quote:
Originally Posted by Jgrove998 View Post
Doing some research it was actually the electronic way to control timing in a carbureted engine. Looks like is uses early versions of sensors like the TPS, IAT and coolant temp....pretty nifty system for the 70's.

Watch this old school Chrysler Instruction Video on how the system works: CLICK!
That was interesting, i cant believe some one ripped that to MP4 i wonder what that video was originally recorded on.

Did you hear the part they said the A/F was 18:1 at medium to high speed driving and 16:1 during start and ideling? On this new system. They used the same carb. but it was retweaked for the new a/f ratio.

18:1? wow
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Old 10-26-2011, 11:24 PM   #4
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Ah yes, a primitive form of emissions control prior to electronic fuel injection. I'm a little too young to remember the era, but I believe many owners who had the ability to, did in fact remove it. The 70's were a dark time for cars.

BTW loved the video. Reminded me of many filmstrips viewed back in the good old days. Especially at the end when the sound warbles.
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Old 10-26-2011, 11:47 PM   #5
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Ah yes, a primitive form of emissions control prior to electronic fuel injection. I'm a little too young to remember the era, but I believe many owners who had the ability to, did in fact remove it. The 70's were a dark time for cars.

BTW loved the video. Reminded me of many filmstrips viewed back in the good old days. Especially at the end when the sound warbles.
Was it for emissions or for fuel economy? Dark times? as in alot of tailpipe smoke?


oh yeah! it was probably ripped off a film projector.

The system sounds good but it also sounds like there would be issues with alot of the sensors and vacuum actuators.
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Old 10-27-2011, 12:01 AM   #6
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Dark times as in, cars were pieces of crap that had to run terrible in order to meet emissions requirements. This was an attempt to improve things but I don't think it was entirely successful. And yes, it was meant to allow the existing engines to meet tighter emissions requirements. Better fuel economy was a side benefit. Fuel injection and more advanced computers made this obsolete. It was one of those early attempts that had the right idea but they just weren't there yet.

Link:

http://www.allpar.com/mopar/lean-burn.html
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Old 10-27-2011, 01:31 AM   #7
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I think my dad cracked it open to see if he could figure out what was wrong but all the electronics are covered in a silicone. There is actually more in this thing then i thought. There are a few chips that look covered like they might have overheated.

It looks pretty bullet proof but i know how the early electronics were with solder connections. Large componets and poor foil traces, you mix that with a hot engine and alot of under hood vibrations and i can see why they failed.

Its still interesting to me though. Really cool idea.
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Old 10-27-2011, 09:23 AM   #8
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The Lean burn System is the Scourge of all 70's and 80's v8 Chryslers. I don't know a single enthusiast that still has it fitted. My old Dodge from 1987 had a TBI system that was scarcely better.
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Old 10-27-2011, 09:25 AM   #9
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Quote:
Originally Posted by BowerR64 View Post
Did you hear the part they said the A/F was 18:1 at medium to high speed driving and 16:1 during start and ideling? On this new system. They used the same carb. but it was retweaked for the new a/f ratio.

18:1? wow
Yes, I was like
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Old 10-27-2011, 09:50 AM   #10
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Quote:
Originally Posted by Jgrove998 View Post
Yes, I was like
How could they run that lean without burning up so quickly? I would think it would cook the rings and not last?
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