Lancia Fulvia - Engine

Engine

One element that was new was the narrow-angle V4 engine. Designed by Zaccone Mina, it used a narrow angle (12°53'28") and was mounted well forward at a 45° angle. The engine is a DOHC design with a one camshaft operating all intake valves and another operating all exhaust valves. The very narrow angle of the cylinders allowed for use of a single cylinder head.

Displacement began at just 1091 cc with 58 bhp (44 kW) with a 72 mm bore and 67 mm stroke. A higher (9.0:1) compression ratio and the fitment of twin Solex carburettors raised power to 71 bhp (53 kW) soon after.

The engine was bored to 6 mm to enlarge displacement to 1216 cc for the HF model. This, and some tuning, raised output to 80 to 88 bhp (60 to 66 kW).

The engine was re-engineered with a slightly narrower bank angle (12°45'28") and longer (69.7 mm) stroke for 1967. Three displacements were produced: 1199 cc (74 mm bore), 1231 cc (75 mm bore), and 1298 cc (77 mm bore). The new 1298 cc engine was produced in two versions; the type 818.302 produced 87 bhp (65 kW) at 6000 rpm and was fitted to 1st series Coupes, Sports and Berlina GTE and later to the 2nd Series Berlina. The Type 818.303 was first produced with 92 hp (69 kW) and was fitted to the 1st series Coupe Rallye S and Sport S. For the 2nd Series Coupe and Sport power was slightly reduced to 90 hp (67 kW) at 6000 rpm. The 1199 cc engine was only fitted to the Berlina sold in Greece.

The engine was completely reworked for the new 1.6 HF with an even-narrower angle (11°20' now) and longer 75 mm stroke combined with a bore of 82 mm gave it a displacement of 1584 cc, and power ranged from 115 to 132 bhp (85 to 98 kW) depending on tune.