Honda Automotive Gasoline Engine Chronicles (Part 9: Inline-4 Ex Series)

🌟 Knowledge Series: Honda Automotive Gasoline Engine Chronicles (Part 9: Inline-4 Ex Series)

📖 Original by Honda誌 | JDM Enthusiasts’ Journal | Updated Today

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🚗 Honda's Ex Series Inline-4 Engine Family

In Honda’s lineage of inline-4 automotive engines, the Ax series laid the foundation, dominating the 1960s with models such as AK, AS, AL, AP, and H1300. As the 1970s dawned, Honda introduced the Ex series, which differed from the Ax series in several key ways:

💡 Displacement: The Ex series engines featured larger displacements, ranging from 1.2L to 1.8L.
💡 Valve Train Configuration: These engines used SOHC designs instead of the high-performance DOHC setups characteristic of the Ax series.
💡 Technological Transition: The Ex series bridged the transition from carburetors to fuel injection and from naturally aspirated to turbocharged engines.

📌 The first engine in the Ex series was the EA twin-cylinder engine (356cc) launched in May 1971 for the Honda Life (SA). However, the Ex series’ first inline-4 engine was the EB1, introduced in July 1972.

🔧 The Pioneering EB1 Engine

The EB1 engine, specifically designed for the first-generation Honda Civic (1972), was pivotal in Honda's resurgence. 🌟

After the H1300 air-cooled engine’s commercial failure nearly led Honda to exit the automotive market, the EB1 engineand Civic became the company’s comeback heroes. 🏆

💡 EB1 Features:

Displacement: 1,169cc
Bore x Stroke: 70mm x 76mm (long-stroke design)
Compression Ratio: 8.6:1
SOHC Configuration: 8 valves operated by a single camshaft.
Fuel System: Single or dual carburetors.

💪 Performance Variants:

Deluxe Trim: 60 hp
GL Trim: 69 hp and 10.2 kg·m torque @ 4,000 rpm
Civic RS (1974): Dual CV carburetors, 76 hp @ 6,000 rpm, and 10.3 kg·m torque @ 4,000 rpm.

📈 Evolution of the Ex Series

Between 1974 and 1980, Honda expanded the Ex series with various inline-4 engines tailored to different models and markets:

🚗 EC (1973): 1,488cc, used in the first-gen Civic four-door sedan.
🚗 ED (1975): 1,487cc, Civic Van, featuring three-valve-per-cylinder CVCC technology.
🚗 EF (1976): 1,599cc, first-gen Accord (SJ).
🚗 EK (1978): 1,751cc, second-gen Accord (SZ).
🚗 EJ (1979): 1,335cc, second-gen Civic 1300.
🚗 EL (1979): 1,602cc, export-market second-gen Accord.
🚗 EM (1979): 1,488cc, second-gen Civic 1500.
🚗 ER (1981): 1,200cc, first-gen City Turbo (AA).
🚗 ES (1982): 1,829cc, later renamed A18A in 1985.
🚗 ET (1983): 1,829cc, Accord with 130 hp PGM-Fi system.
🚗 EV (1983): 1,342cc, first-gen CR-X.
🚗 EW (1983): 1,488cc, renamed D15A in 1987.

🌟 Milestone Engines: ER, ED, and ES

🔥 ER Engine (1981):

The ER engine revolutionized the Honda City (AA) with second-gen CVCC technology:

Naturally aspirated: 67 hp
Turbocharged: 100 hp with PGM-Fi
Turbo II (1983): 110 hp and 16.3 kg·m torque with intercooler

💡 ED Engine (1975):

The ED engine debuted in the Civic Van, featuring Honda's first three-valve-per-cylinder CVCC system for lean burn combustion.

🚀 ES Engine (1982):

The largest in the Ex series, the ES engine (1,829cc) delivered 125 hp in its carbureted variant and powered high-performance models like the Prelude XC.

🔄 Transition to the D Series

By the mid-1980s, the Ex series evolved into the D series. For instance, the EW engine (1983) was rebranded as D15A. This marked Honda's shift to a more unified naming convention and advanced PGM-Fi fuel injection systems.

🎉 Stay tuned for the next part of our Honda Engine Chronicles! 🚗✨

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