Fulvia
Lancia's final V4 series were used in the Fulvia. Designed by Zaccone Mina, it used a narrow angle (13°) and was mounted well forward at a 45° angle. The engine was a true DOHC design with one camshaft operating all intake valves and another operating all exhaust valves.
Displacement began at just 1091 cc with 59 hp (44 kW) with a 72 mm (2.8 in) bore and 67 mm (2.6 in) stroke. A higher (9.0:1) compression ratio raised power to 71 hp (53 kW) soon after.
The engine was bored to 6 mm (0.2 in) to enlarge engine displacement to 1216 cc for the Coupé model. This, and some tuning, raised output to 80 hp (60 kW), furtherly enhanced up to 88 hp (66 kW) for the HF model.
The engine was reengineered with a slightly narrower bank angle 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 latter engine is most common, with the former only sold in Greece. Three level of performance were available: 87 hp (65 kW) for common 1.3 Liter (commonly imported in USA and described as "highly tuned" by Road & Track at the time); 90 hp (67 kW) for its 1.3s evolution and 101 hp (75 kW) for the Rallye HF.
The engine was redone again for a new HF with an even-narrower angle (11° now) and longer 75 mm (3.0 in) stroke for its final incarnation. A bore of 82 mm (3.2 in) gave it a displacement of 1584 cc, and power shot up to 114 to 132 hp (85 to 98 kW) depending on tune.
Read more about this topic: Lancia V4 Engine