Twinspark 4 Cyl

The Alfa Romeo Twin Spark (or “TwinSpark”) engine is a unique and iconic part of Alfa’s engineering history especially in the 4-cylinder segment. It was used extensively in the 1990s and early 2000s and is best known for its two spark plugs per cylinder, giving it the name “Twin Spark.”

What is the Twin Spark Engine?

Feature	Detail
Engine Type	Inline-4 petrol
Valvetrain	DOHC (Double Overhead Cam), 8V or 16V
Fuel System	Fuel injection (Bosch Motronic)
Special Feature	Two spark plugs per cylinder for more efficient combustion
Displacement	Ranged from 1.4L to 2.0L, most popular: 1.6, 1.8, and 2.0
Timing	Belt-driven camshafts (regular replacement is critical)

Why Two Spark Plugs Per Cylinder?

Better fuel-air mixture ignition, especially in lean-burn conditions.
Improves low-rev torque, fuel economy, and emissions.
Reduces knocking and allows smoother performance.
One spark plug fires slightly before the other (staggered ignition) for maximum efficiency.

Common Twin Spark Engine Variants

Engine	Power Output	Notes
1.4 TS 16V	~105 hp	Small cars (147, 145)
1.6 TS 16V	~120 hp	Popular and fuel-efficient
1.8 TS 16V	~140 hp	Balanced option
2.0 TS 16V	~150–155 hp	Most powerful TS version
Early 8V TS	~109 hp (2.0 8V)	Used in 75, 155 (late ’80s–early ’90s)

Cars That Used Twin Spark Engines

Alfa Romeo 145 / 146
Alfa Romeo 147
Alfa Romeo 155
Alfa Romeo 156
Alfa Romeo GTV / Spider (916)
Alfa Romeo 75 (older 8V TS)

Pros of Twin Spark Engines

Strong mid-range torque for a naturally aspirated engine
Great sound, especially with an aftermarket exhaust
Classic Alfa DNA in driving feel
Unique engineering and identity

Common Issues to Watch For

Problem	Cause
Timing belt failure	Must be changed every ~60,000 km or 4 years
Oil consumption	Common with age – monitor oil levels
Variator failure	Makes diesel-like noise at idle – needs replacement
Coil packs / spark plugs	More plugs = more maintenance (8 total plugs)
Camshaft wear	Use quality oil to reduce wear on lobes and lifters