engine produced at 5000 rpm, the effect of which was to reduce the Rapier's 0- time by almost 1 second and increase its top speed by . British magazine The Motor tested a Series I twin carburettor saloon in 1957, recording a top speed of and acceleration from 0– in 20.9 seconds and a fuel consumption of . The test car cost £1043 including taxes of £348. In competition, a Rapier driven by Peter Harper finished in fifth place in the 1958 Monte Carlo Rally. In total, 7,477 units were produced of this initial version of the Sunbeam Rapier. It was discontinued in 1958 on the introduction of the Series II. Series II The Sunbeam Rapier Series II was announced on 6 February 1958, available in hardtop and convertible forms. Rootes arranged for nine of the new cars to be in Monte Carlo for the press to try at the end of the 1958 Monte Carlo Rally. The traditional Sunbeam radiator grille was reintroduced, albeit shortened and widened and the spaces at its sides were filled with horizontal side grilles. The two-tone lower body colour scheme of the Series I was discontinued in favour of a broad full length flash in the same colour as the roof, but the most obvious change was the appearance on the rear wings of pronounced fins. The interior of the Series II was little changed from that of the Series I, except that a floor gear change replaced the column change, a modification, developed on the works Series I rally cars. To keep costs down, the leather upholstery, standard on the Series I, was discontinued in favour of vinyl and overdrive became an extra cost option. An improvement in the Series II though, was its more powerful engine. Referred to as the Rallymaster, it had an increased capacity of . The capacity increase combined with a higher compression ratio of 8.5:1 and larger inlet and exhaust valves to raise the power output to at 5,200 rpm. Autocar quoted the top speed as with a 0- time of 20.2 seconds. Also as a direct result of competition experience, the Series II was fitted with larger front brakes and a recirculating ball steering box instead of the worm and nut box of the Series I. The Series II was discontinued in favour of the Series III in 1959 after 15,151 units (hardtop and convertible) had been