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Techical Discussions => General Tech => Topic started by: Stan Paralikis on August 01, 2010, 04:17:33 AM

Title: Lean Burn - It coulda been great!
Post by: Stan Paralikis on August 01, 2010, 04:17:33 AM





Commando12010-08-01 09:19:43
Title: Lean Burn - It coulda been great!
Post by: Leaburn Patey on August 01, 2010, 02:06:45 PM
Back then,the problem was carburetors and computers just don't mix.
 
The LeanBurn focused on the ignition for effeciency using crude electronics mixed with a vacuum source that read a drop or increase of overall vacuum on the engine.
No mass air flow sensors,no oxygen sensors,no throttle position sensors.
When it worked,it worked well.But as you all know when it crapped out,it converted many drivers into pedestrians.
Many ripped out the system for  the proven reliable ECU Chrysler electronic ignition system which is still a popular conversion and upgrade for our MOPARS.
The system lasted right up to 1990 in trucks (360 4bbl on 1 ton chassis) and 1989 in the M body cars (318 2bbl and 4bbl).
By then,the 318's had feedback carbs,O2 sensors,temp sensors,anti-knock sensors,etc.
They did all they could with a carburetor on top of the engine before going to throttle body injection,and eventually multi-port fuel injection.
Funny thing is fuel injection has been around for 20 + years (Mercedes,and other high end imports) by the time LeanBurn was introduced.
 
By the mid-late 80's it was renamed Electronic Spark Control.
More refined,more reliable,but the computers still crapped out.
 
LeanBurn was ahead of its time--It was one of the biggest flops that helped push Chrysler into bankruptcy in 1979.
LeanBurn does have a place in automotive history,and was a step towards fuel injection.
Title: Lean Burn - It coulda been great!
Post by: Snotty on August 01, 2010, 02:49:54 PM
I had it on the Cordoba and the Fifth Avenue.  I never like the adjustable timing on the Cordoba.  Same day, same drive, and pinging at one intersection and not and the next - crap!  Did not have that problem with the Fifth.


 
I bought an '87 RamCharger new, 360 4-speed.  I do not remember that truck having the system.  Unless it was no longer attached to the Air Cleaner I'd say it was not on it.
Title: Lean Burn - It coulda been great!
Post by: Leaburn Patey on August 01, 2010, 04:09:15 PM
The trucks had the pooter mounted inside the left front fender right  above the sidemarker lamp.
318 4bbl M body cop cars had the pooter mounted in the right kickpanel inside the car. 
Title: Lean Burn - It coulda been great!
Post by: Stan Paralikis on August 02, 2010, 03:17:50 AM
Lea: Have you ever heard of anyone actually hacking one back in the day?  
Title: Lean Burn - It coulda been great!
Post by: Leaburn Patey on August 02, 2010, 09:01:07 AM
Hacking as in cutting the wires and smashing the pooter to tiny little pieces..LOL!!
Seriously,I never heard anybody be able to play with it--not even the Chrysler mechanics
could really understand the system.
There were no "performance" versions .
The electronic ignition systems did have "hotter" ECU's i.e. "orange" box and the "gold" box for street and race only applications,respectively.