Daihatsu Car Engines: Fourtak, Terios, Trevis, Cuore

Published by Carl Wilson on

Daihatsu logo

Daihatsu Intelligent car Engines are available at enginesandgearboxes.co.uk as used, reconditioned or secondhand.

Daihatsu have developed the world’s first “intelligent catalyst” to go in their engines, has a precious metal (palladium) that self-regenerates by utilising the natural oxidation-reduction fluctuation in exhaust gas. This regenerating effect helps the catalyst maintain its initial performance for purifying the exhaust gas.

Daihatsu engine perfomance

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DVVT (Dynamic Variable Valve Timing) A computer optimises the valve timing according to such conditions as engine rpms and how far the accelerator pedal is depressed.

Daihatsu Original Catalyst. Daihatsu’s original technology led to development of this compact, high-performance, long-lasting catalyst for purifying exhaust gas. It replaces previous complicated, expensive systems that incorporate three separate catalyst converters. Called a “manifold converter” (it’s placed close to the engine), the new catalyst has just one catalytic converter yet achieves Japan’s ULEV (Ultra-Low Emission Vehicle) standards.

Daihatsu engine catalyst

Two O2-Sensor System This system places one O2 sensor upstream and one downstream from the Daihatsu Original Catalyst. The sensors detect oxygen levels in the exhaust gas and adjust the air/fuel ratio accordingly to maintain superior CO, HC, and NOx purification.

How does an oxygen sensor work? The electrode of an O2 sensor converts the measured oxygen level in the exhaust gas to a voltage, which the engine computer inputs and compares to ideal values. Voltage output from the sensor varies from 0.1V (High Oxygen, Lean mixture) to 0.9 V (low oxygen, rich mixture). The computer constantly reads the O2 sensor and adjusts the fuel injection rate by varing the pulse width of the fuel injector “open” time. An air/fuel mixture of 14.7:1 is considered ideal for emissions and allows the catalytic converter to operate at peak efficiency.


An oxygen sensor produces no voltage when the sensor temperature is below 600 degrees F. Until the sensor reaches operating temperature, the engine computer operates in open loop mode where default fuel settings are used. The sensor’s used in the Daihatsu’s are internally heated to speed warm-up.

Available are: The Cuore, Trevis, Sirion, Materia, Terios, Copen is sold under the name of “CHARADE” in some markets, these are the new Daihatsu’s lasted newer models. Of Course older models are available but don’t have the intelligent O2 sensor system.

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Carl Wilson

You won't believe it, I'm native Scotsman. Enthusiast. Car lovers. Almost finished rebuilding my Reliant Saber 🔥


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