When did Chrysler start using the lean burn system?

Lean-Burn was used on the ancient Slant-Six in truck applications well into the 1980s. Road & Track tested a Lean-Burn 400 Cordoba and a standard (“fat-burn”) 360 Dodge Charger in 1976. Their results seemed promising: identical 0-60 and quarter-mile times, despite the Cordoba packing 40 more horsepower (but weighing 200 pounds more).

How did the lean burn engine system work?

An early computerized spark-advance control system, Lean-Burn attempted to make the engine cleaner from within, rather than simply bolting on cleaners (like catalytic converters) after the fact. The system consisted of three parts: the carburetor, the spark-control computer, and a group of eight external sensors.

Can a slant six engine be converted to lean burn?

This article outlines the Chrysler Lean Burn “conversion” to the earlier electronic ignition, or better stated as Lean Burn system removal from Mopar Slant Six engines (170 , 198 , 225). This article is also useful when converting from points to Mopar’s factory style electronic ignition (EI) or orange box (ECU).

Where is the lean burn computer on a truck?

Lean Burn computers in the later trucks were moved from on top of the engine’s air cleaner to the fender, behind the battery, in an effort to reduce problems related to heat and vibration. It seems to have worked because the Lean Burn computer in my 85 pickup outlasted the original motor.

When was the lean burn engine control system introduced?

The Lean Burn system was an early spark advance control system (introduced in 1976 and continuing to the 1980s) that was troublesome due to the nature of the contemporary electronic components, as well as the yards of vacuum hose and competent mechanics needed to keep it working.

How to convert lean burn computer to Chrysler?

Connect the new wiring harness to the negative lead per the wiring diagram. Connect the 12v+ lead from the new wiring to a source of power which is only on with the key turned to run. If removing the Lean Burn computer is desired, the positive power to the coil should be wired using the ballast resistor diagram.

When did Lean Burn ignition start on Slant Six?

Solid state Electronic Ignition (EI) was used from 1972 -1983 on Slant Six cars and trucks. V-8 models used the same wiring, but a different distributor. Around 1978 the Lean Burn computer ignition system (LB) was introduced in an effort to control pollution and reduce tune-up frequency.

Can a lean burn system change fuel economy?

A slight change in fuel economy would only be noticed if the Lean Burn system was in excellent working condition (if any change was seen at all). The electronic ignition paves the way for some special modifications such as Super Six carb rejetting, performance ignition systems like MSD, and customized timing advance curves.

How does the ignition coil work on a Chrysler fourforty?

This induces a small electrical pulse into the coil, which is sent to the ECU. The ECU acts as an amplifier for these pulses and in turn sends a much larger pulse to the ignition coil. The coil acts the same way as in a points type system and produces the high voltage needed to fire the spark plugs. Application

What makes an internal combustion engine not start?

To operate efficiently, an internal combustion gasoline engine needs a good spark, the right amount of fuel, and good compression (a healthy mechanical condition). The lack of any of these three things will prevent your engine from starting.

How did the lean burn computer system get its reputation?

Yet Lean-Burn quickly gained a reputation for unreliability. Heat and vibration are a computer system’s enemies, and yet the (advanced then, but primitive by today’s standards) Lean-Burn computer attached to the air cleaner, rather than (for example) the firewall.

How does a lean burn carburetor work?

The carburetor ran very lean–an 18.0:1 air/fuel ratio, well off the standard stoichiometric 14.7:1. What’s more, Chrysler was able to meet hydrocarbon, carbon monoxide, and nitrogen oxide levels without use of a catalytic converter.

What kind of engine did the Chrysler New Yorker have?

The new yorker took the chrysler imperial design to a whole different level. The computer controlled 440cid v8 came equipped with a “lean burn” option to help acceleration response and performance. With competitors like the cadillac eldorado and lincoln mark series, chrysler did an amazing job with this highly optioned luxury machine.

Who was the inventor of the lean burn engine?

The patent was granted in August 8, 1978, listing Gordon Fenn as the inventor. Marc Rozman told us that Gordon Fenn had come up with the system very quickly, and had also worked on substantial improvements to the 1980-81 Imperial electronic fuel injection system (after its introduction, to make it workable on vehicles in the field).

Is the lean burn engine control system still in use?

Materials technology eventually caught up, but many mechanics did not, and many owners simply switched to conventional carburetors.