Mercedes 250 SL

About the Mercedes 250 SL

The 250 SL was introduced at the 1967 Geneva Motor Show.[10] Production had already commenced in December 1966 and ended in January 1968. The short one-year production run makes the 250 SL the rarest of the W 113 series cars. The 250 SL retained the stiffer suspension and sportier feel of the early SLs, but provided improved agility with a new engine and rear disc brakes. Range also improved with increased fuel tank capacity from 65 L (17.2 US gal) to 82 L (21.7 US gal). Like its predecessor, the 250 SL was offered with a 4-speed automatic transmission, and 4-speed or ZF 5-speed manual transmissions.[10] For the first time, an optional limited slip differential was also available. Of the 5,196 250 SLs produced, more than a third were sold in the US.

The main change was the use of the 2,496 cc (2.5 L) M129.II engine with 6 mm (0.2 in) increased stroke, 2 mm (0.1 in) increased valve ports, and seven main bearings instead of four. The nominal maximum power remained unchanged at 150 PS (110 kW; 150 hp), but torque improved from 145 lb·ft (197 N·m) to 159 lb·ft (216 N·m).[10] Resiliency also improved with a new cooling water tank ("round top") with increased capacity from 10.8 L (2.9 US gal) to 12.9 L (3.4 US gal), and a standard oil-water heat exchanger.

The wider power band of the 250 SL resulted in noticeably improved performance, as the 230 SL engines rarely produced more than 143 PS (105 kW; 141 hp) in practice.