Alfa Romeo Car Engines, Used Giulietta, Spyder, GTV

Published by Carl Wilson on

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The Alfa Romeo Twin Cam engine series was a inline-4 cylinder engine, used, secondhand or reconditioned are produced by Alfa Romeo from 1954 to 1994, models includes 2000, GT Junior, Sprint GT, and many more. See also some amazing deals on our BMW Engines.

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The features of the Giulietta engine include

  • – Aluminium alloy engine block with cast-iron cylinder liners
  • – Aluminium alloy cylinder head with hemispherical combustion chambers
  • – Forged steel crankshaft running in five main bearings
  • – Double overhead camshafts driven by a double row timing chain
  • – Camshafts directly actuate valves via bucket tappets
  • – Two inclined valves per cylinder with near central located spark plug
  • – Inlet and exhaust valves separated by an angle of 80 degrees

This made the Alfa Romeo Twin Cam engine an advanced design for a production car of the mid 1950s. These design features, with minor variations, would form the basis of all future versions of the engine.

The capacity increased to 1570 cc with the introduction of the Giulia in 1962. Racing versions of the Giulia engine include the twin plug engine used in the GTA, which featured a cylinder head with two spark plugs per cylinder. 

A turbocharged version of the 1779 cc single plug engine was fitted to the Alfa Romeo 75, providing 155 bhp in standard form and a potential for a power output of 300 bhp in Group A touring car racing form. The 75 was fitted with a twin spark plug per cylinder head design, which provides improved fuel ignition and allows an improved combustion chamber shape with narrower angle between intake and exhaust valve.

This combined with variable valve timing and electronic fuel injection to give a power output of 148 bhp. Production of the Alfa Romeo Twin Cam ended in 1994, by which time it had been superseded by the newer 16 valve Twin Spark engine.

Find more information on some Alfa Romeo Models here:
Alfa Romeo 147 Engine
Alfa Romeo 159 Engine
Alfa Romeo Brera Engine
Alfa Romeo GT Engine
Alfa Romeo Spider Engine

Alfa Romeo Twin Spark (TS) technology engine was used first time in Alfa Romeo racing cars in 1923. In the early 1960’s TS was used in their racing cars (GTA, TZ, Spider, 2600) to enable it to achieve a higher power output from its engines.

In the early and middle 1980s, Alfa Romeo incorporated this technology into their road cars to enhance their performance and to comply with stricter emission controls. Twin Spark name refers usually to engines made after 1986 when the 164 Twin Spark were introduced.

The TS series engines are all ‘4 cylinder inline’ with twin cam (DOHC) shafts,¬†and are developed first with 8 valves (an all alloy wet-liner engine) and later with 16 valves (a modern iron block engine with alloy head). All cars featuring the Twin Spark engines since the¬†Alfa¬†Romeo 155¬†(which originally also came with the 8V unit) use the 16 valve models over the 8V ones.

The Twin Spark name comes from the fact that there are two spark plugs per cylinder. The two sparks on the early Alfa twin spark engines fired on the power stroke to help create a larger flame front ensuring less unburnt fuel in the exhaust as well as a higher thermodynamic efficiency. The 8V units have 8 identical spark plugs, while the 16V ones have a larger and a smaller plug in each cylinder. On the later 16v TS engines the smaller plug ignites on the exhaust stroke to reduce emissions.

The common TS 16V engines, 1.6, 1.8 and 2.0, all use a 10 mm diameter and a 14 mm diameter plug per cylinder. The engines also incorporate two devices to improve the performance under normal operation, the Camshaft Phase Variator and the air intake Variable Inlet Control on the 1.8 and 2.0 litre versions. 

The engines also incorporate two devices to improve the performance under normal operation, the¬†Camshaft Phase Variator¬†and the air intake Variable Inlet Control on the 1.8 and 2.0 litre versions. Alfa Romeo’s in-house V6 engine debuted in 1979 with the¬†Alfa 6, and became famous in the later¬†164.¬†The first engine introduced was the 2.5 L version. With modifications, it is possibile to increase the capacity to 3.8 L.

GM High Feature engines,¬†the¬†3600 LY7, 159, Brera¬†and some more (and derivative LP1) are members of General Motors’ new High Feature (or HFV6) engine family of modern DOHC V6s. This new family of engines was introduced in 2004 with the Cadillac CTS.

Holden sells the HFV6 under the name, Alloytec. The block was designed to be expandable from 2.8 L to 4.0 L.¬†It is a 60¬į 24-valve design with aluminum block and heads and Sequential Electronic Fuel Injection. Most versions feature continuously-variable cam phasing on both intake and exhaust valves and electronic throttle control.

Other features include piston oil-jet capability, forged crankshaft and connecting rods, variable intake, and electronic throttle control. It was developed by the same international team responsible for the Ecotec, including the Opel engineers responsible for the 54¬į V6, with involvement with design and development engineering from Ricardo PLC of¬†England.

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Carl Wilson

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


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