4age

 This page is a scratchpad for 4AGE stuff, and will probably be perpetually under construction.

I chose the 4age because of its reputation and because of the availability of some retrofit parts made by a kind gentleman in Texas named John Pels, who built an adaptor plate and hardware for the Renault NG-x transaxle.    I also feel that the 4age is very similar in specification many respects (identical in some) to the Cosworth BDA, so it seems a good choice for a the sympathetic restoration of a Lotus  Europa.    

The donor was a FWD AE92 Toyota Corolla.

My 4age is 3rd generation  "red top",  a small-port non-TVS model - apparently a good candidate for HP improvements,  I bought the rusty donor FWD corolla years back, and am hoping the engine is basically sound.   I will have a specialist assess it and recommend any necessary work and upgrades.  

As built, this engine produced 128hp at 7800 RPM 105 lb/ft of torque, with very good fuel economy and Corolla-worthy reliability and driveability.   Stock, it would be a huge performance boost for the S2, with modern engine management and good parts availability.  This was also the engine of choice for Formula Atlantic cars in the class's heyday, so its a well-proven upgrade platform.  What's not to like?  

There's plenty of information online about this iconic engine.

Wire for oil pressure sender, temp sensor

determine thermoswitch range for 4age rad fan.

engine sensors 

https://www.facebook.com/88rsi/posts/4age-sensorsthe-4age-is-a-very-simple-engine-compared-to-more-modern-engines-so-/2295569200685287/

4age Sensors.

The 4age Is A very simple Engine Compared To More Modern Engines. So Today I Will Be Covering The Main Sensors That Run The Engine.

-Coolant Temp Sensor. The Main Job Of The Coolant Temp Sensor Is To Tell The Ecu,The Temperature Of The Coolant In The engine. If The Ecu Sees That The Coolant Is Cold It Will Add Extra Fuel To Get The Engine To Idle Better And Warm Up Quicker.

-Air Temperature Sensor. The Job Of The Air Temperature Sensor Is To Tell The Ecu The Temperature Of The Air Outside. The Lower The Air Temperature The More Dense Air Gets, To compensate On The Thicker Air The Ecu Will Add More fuel So The Engine Runs As efficiently As Possibly. The Air Temp Sensor Is Located Either On The Intake Manifold Or In The Air box.

-Throttle Position Sensor. The Job Of The Throttle Position Sensor, Is To Tell The Ecu How Much The Accelerator Pedal Is Pressed And The Load The driver Is Asking From The Engine. It Directly Affects How Much Fuel Is Injected Into The Combustion Chamber. It Is Very Important To Have It Adjusted Correctly Or The Ecu Will Over Fuel At Idle Thinking You Are Revving The Car.

-Manifold Absolute Pressure Sensor. The Map Sensor Provides Instantaneous Manifold Pressure Information To The Ecu. The Data The Ecu Is Sent, Is To Calculate Air Density To Determine The Engines Mass Airflow Rate, Which Determines The Required Fuel For Optimal Combustion. The Map Sensor Will Also Influence The Advance Or Retard Of ignition Timing.

-Knock Sensor. A Knock Sensor Is Designed To Retard Ignition Timing When Knock Occurs. Engine Knock Occurs Much Sooner Than A Human Can Ever Hear it. The Knock Sensor Is A Peizo That Generates A Small Voltage When It Encounters Shock Or vibration. When Knock Occurs, Then The Sensor Will Retard The Timing. It Is Very Important To Only Run 95Octane Or Higher In Twin Cams, To Reduce The Chance Of Ever Getting Knock. Only From The series 3 4age And So On Was Equipped With The Knock Sensor. Since They Ran A Much Higher Compression Ratio.

-Oxygen Sensor. The Oxygen Sensor Is Placed In The Exhaust. It dynamically Adjusts The Fuel To Air Ratio To Keep Emissions Down And Keeps The Car Running As Smoothly As Possible. Only The 20valve 4age Was Equipped With The Oxygen Sensor

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