Fiat Twin Cam engine

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Fiat Twin Cam engine
Locust Fiat.JPG
Overview
Manufacturer Fiat/Lancia
Production 1966–2000

Designed by Aurelio Lampredi the Fiat Twin Cam (also known as the Lampredi Twin) was an advanced inline-four automobile engine produced from 1966 through 2000 as a Fiat/Lancia engine until it was replaced by the "family B" series of engines. The engine shares a lot of parts and most dimensions with the pushrod Fiat 124 series engine (later also available with an overhead camshaft). As the name implies, it was a DOHC design, which was quite unusual in the late 1950s. The engine was produced in a large number of displacements, ranging from 1,297 cc to 1,995 cc and was used in Fiat, Lancia, Alfa Romeo, SEAT and Morgan cars

Fiat was the pioneer in engine development during the time period, using a monoblock technology, belt driven camshafts and aluminium alloy heads.[citation needed] Earlier Fiat Twin Cam engines were actually O.S.C.A. designs.

Applications[edit]

Lampredi's Twin Cam engine was first seen in the Fiat 124 Coupé of late 1966, but was later made available in a large number of cars.

Fiat[edit]

Lancia[edit]

Alfa Romeo[edit]

Fiat CHT engine in a Croma

One interesting version was the CHT (for "Controlled High Turbulence"). This was mainly used in the first generation Fiat Croma and used auxiliary intake ducts to provide a better fuel and gas mixture under low or partial acceleration.[1] This meant considerably improved fuel mileage.

Displacements[edit]

Displacement
(cc)
Bore
(mm)
Stroke
(mm)
1297 76 71.5 Lancia Beta, Fiat 131 Supermirafiori[citation needed]
1301 76.1 71.5 Lancia Beta[citation needed]
1367 78 71.5 Lancia Beta, Fiat 131 Supermirafiori[2]
1438 80 71.5 Fiat 124 Special T/Coupe/Spider
1585 84 71.5 Fiat 131 Supermirafiori/Argenta/Ritmo 105TC; Lancia Beta/Delta GT/Delta HF/Prisma
1592 80 79.2 Fiat 124 Special T/Coupe, Fiat 132; Lancia Beta
1608 80 80 Fiat 124 Coupe/Spider, Fiat 125
1756 84 79.2 Fiat 124 Coupe/Spider/132/Tipo/Tempra; Lancia Beta/Delta/Prisma
1995 84 90 Fiat Spider 2000/132/Argenta/Strada/Ritmo/Regata/Croma/Tipo/Tempra; Lancia Beta/Delta/Prisma/Thema

Motorsport[edit]

The Fiat Twin Cam engine has been widely used in motorsport and has been the most successful engine in the history of the World Rally Championship. The World Rally Championship for Manufacturers has been won by Fiat and Lancia, using engines based on the Lampredi Twin Cam engine, for a total of 10 years.

In addition to the titles in the World Rally Championship, the Fiat Twin Cam equipped the Lancia Beta Montecarlo Turbo, that won the World Sportscar Championship for two consecutive seasons in 1980-1981.

Constructor Car used in World Championship Seasons Manufacturers' Titles
Italy Fiat Fiat 124 Abarth 1970–1975
Italy Lancia Lancia Beta Coupe 1974–1975
Italy Fiat Fiat 131 Abarth 1976–1982 3 (1977, 1978, 1980)
Italy Lancia Lancia 037 1982–1986 1 (1983)
Italy Lancia Lancia Delta HF 4WD and Delta Integrale 1987–1993 6 (1987–1992)

Footnotes[edit]

  1. ^ "CHT". Dizionario Tecnico dell'Automobilismo [Technical Automotive Dictionary] (in Italian). Retrieved 2013-05-01. 
  2. ^ Büschi, Hans-Ulrich, ed. (March 3, 1982). Automobil Revue '82 (in German/French) 77. Berne, Switzerland: Hallwag, AG. p. 296. ISBN 3-444-06062-9.