| Moto Guzzi V8 | |
| Aka: | The Otto, Ottocilindri |
| Manufacturer: | Moto Guzzi |
| Model Year: | 1955–1957 |
| Class: | Grand Prix racing motorcycle |
| Engine: | 499cc 4-stroke 90° V8 liquid cooled, DOHC, 8 Dell'Orto 20 mm carburettors |
| Bore Stroke: | 44mm41mm |
| Top Speed: | 275km/h[1] |
| Power: | 78hp at 12000 rpm |
| Transmission: | choice of 4, 5 or 6 gears |
| Brakes: | drum |
| Tires: | Front: 2.75" x 19" Rear: 3.00" x 20 |
| Dry Weight: | 148kg (326lb) |
The Moto Guzzi V8, or the Otto motorcycle was designed by Giulio Cesare Carcano specifically for the Moto Guzzi Grand Prix racing team for the 1955 to 1957 seasons. Though following the two-stroke Galbusera V8 of 1938, the Moto Guzzi Otto motorcycle and its engine represent a unique and historically significant engineering milestone.
The Discovery Channel ranked the Moto Guzzi Otto as one of the ten greatest motorbikes of all time.[2]
By 1955, Moto Guzzi had already demonstrated its engineering prowess, creating motorcycles with a wide breadth of configurations: horizontal singles, parallel twins, V-twins in in-line and transverse layouts, 3-cylinders, and 4-cylinders in horizontal and in-line form. The Moto Guzzi V8 reinforced Moto Guzzi's commitment to pushing engineering boundaries. The engine was conceived by Giulio Carcano just after the 1954 Monza Grand Prix and designed by Dr. Carcano.
To introduce the bike, and build publicity, Moto Guzzi's racing team manager released a letter to the international motorcycle press announcing Moto Guzzi's plans for the 1955 Grand Prix season—attaching a drawing of the new Otto and challenging them to guess the configuration of Moto Guzzi's then very secret racing bike. Very few guessed correctly, and the Otto made a stunning public debut a few months later.
The engine and the bike were without precedent: a water-cooled, 500cc V-8 motorcycle — with dual overhead cams and a separate carburetor for each of the eight cylinders. Weighing only 45kg (99lb) (overall bike weight 148kg (326lb)), its miniaturized components tightly packed, the engine produced an unprecedented 780NaN0 at 12000 rpm. The motorcycle proved capable of achieving 275km/h—20 years before the speed was reached again in Grand Prix motorcycle racing.[1]
Tyre, brake and suspension technology, however, lagged behind the powerful engine—making race course field testing difficult and actual racing dangerous. Fergus Anderson crashed the motorcycle on its maiden run in Modena. Only Fergus Anderson, Stanley Woods, Dickie Dale, Ken Kavanagh, Keith Campbell, Giuseppe Colnago, Bill Lomas and Alano Montanari were ever able to even ride the V8 motorcycle. Several of the riders experienced spectacular falls—Bill Lomas suffering a head injury at the 1956 Senigallia Grand Prix. Ken Kavanagh refused to ride the motorcycle after the 1956 race at Spa-Francorchamps.
The Otto Cilindri also proved complex and expensive to build, in addition to the danger the bike posed to the racers themselves. By 1957 there were two bikes available and no one willing to race the bike without further development. Instead, the Otto remained undeveloped, as Moto Guzzi and other manufacturers withdrew from racing entirely in the 1957 season.[3] Speculation suggests that with further development, the V8 could have proved a formidable Grand Prix contender.
Two authentic examples of the engine remain in the possession of Moto Guzzi, at the Moto Guzzi Museum in Mandello. For the 2013 Guzzi World Days (Giornate Mondiali Guzzi, GMG) gathering, the racing bike was rolled out and started for the crowd to hear the sound of the unmuffled V8's exhaust.