Alfa Romeo 690 engine

Not to be confused with the 690T V6 engine powering the Giulia and Stelvio Quadrifoglios.

The Alfa Romeo 690 engine is a custom-built, production-based, high-revving, prototype, four-stroke, 2.5-liter, naturally aspirated, V6 racing engine, designed, developed and produced by Alfa Romeo, purpose-built for the 1996 ITC season. It was loosely based on the PRV engine, used in the Lancia Thema 6v.^[1][2]

Alfa Romeo 690 engine
Overview
Manufacturer	Alfa Romeo
Also called	Alfa Romeo 690RC
Production	1996
Layout
Configuration	Naturally aspirated 90° V6
Displacement	2,498–2,500 cc (2–3 L; 152–153 cu in)
Cylinder bore	88–93 mm (3.5–3.7 in)
Piston stroke	61.3–68.3 mm (2.41–2.69 in)
Valvetrain	24-valve, DOHC, four-valves per cylinder
Compression ratio	12.5:1
Combustion
Fuel system	Fuel injection
Oil system	Dry sump
Output
Power output	400–500 hp (298–373 kW) @ 11,500-11,900 rpm
Torque output	217–220 lb⋅ft (294–298 N⋅m) @ 7,700-8000 rpm
Dimensions
Length	900 millimetres (35 in)
Width	885 millimetres (34.8 in)
Height	485 millimetres (19.1 in)
Dry weight	85–110 kg (187–243 lb)

Applications

• 1996 Alfa Romeo 155 V6 TI^{[3][4][5][6][7]}