Now, on to the more technical stuff. Construction materials are as follows: magnesium alloy crank case, 118mm bore spacing, cast-iron cylinder liners coated with fins for air cooling, aluminum alloy head with hemispherical combustion chamber, forged steel crankshaft with 8 plain main bearings, and titanium connecting rods. The engine also has 2 Weber 46 IDA 3C carburetors. Ignition is electronic single spark, with Bosch coils, and Bendix fuel pumps, and since this is a 901/22 example, it also features Magnetti Marelli twin plugs per cylinder. Be sure to notice the 12 plugs, 2 per cylinder, in the photographs.