1973→1975 Lancia Stratos Group 4
The Stratos was homologated in 1974 as a Group 4 contender in the World Rally Championship and it’s successful design helped Sandro Munari and Björn Waldegård win the championships in 1974, 1975 and 1976.
Like the road-going Stradale version the Group 4 used Ferrari’s Dino 2.4-liter V6 engine but tuned to 275 hp for the 12-valve version and 320 hp for the 24 valve version. This was possible with forged billet aluminum pistons, a ported and gas-flowed cylinder head, larger 45mm valves and twin-throat 48 IDF Weber down-draft carburetors.
The transmission was changed to dog-leg-type gearbox with cascade ratios with all new ratios and fitted to a new sintered-metallic dual-plate clutch and lightweight flywheel.
The suspension was fully rose-jointed with Bilstein telescopic dampers over Eibach coil springs.
Braking was upgraded to 267mm AP Vented Discs w/AP/Lockheed 4-Piston Aluminum Monobloc Calipers which stopped Campagnolo 8×15 wheels.
In Detail
| type | Racing Car |
| production years | 1973 – 1975 |
| built at | Turin, Italy |
| engine | Inline-4 |
| block material | Cast Iron Block |
| valvetrain | 4 Valves per Cyl |
| fuel feed | 48 IDF Weber Carburetors |
| bore | 93 mm / 3.66 in |
| stroke | 60 mm / 2.36 in |
| power | 197.6 kw / 265 bhp @ 7800 rpm |
| body / frame | Monocoque Steel Spaceframe |
| driven wheels | RWD |
| wheel type | Campagnolo |
| front tires | 205/50ZR15 Pirelli P Zero C |
| rear tires | 225/50ZR15 Pirelli P Zero C |
| front brakes | AP Vented Discs w/AP/Lockheed 4-Piston Aluminum Monobloc Calipers |
| f brake size | 28 x 267 mm / 1.10 x 10.51 in |
| rear brakes | AP Vented Discs w/AP/Lockheed 4-Piston Aluminum Monobloc Calipers |
| r brake size | 28 x 267 mm / 1.10 x 10.51 in |
| front wheels | F 38.1 x 21.6 cm / 15 x 8.5 in |
| rear wheels | R 38.1 x 21.6 cm / 15 x 8.5 in |
| f suspension | Strengthened wishbones w/Eibach Springs over Bilstein Telescopic Dampers, Adjustable Anti-Roll Bar |
| r suspension | McPherson Strut w/Eibach Springs over Bilstein Telescopic Dampers, Adjustable Anti-Roll Bar |
| dry weight | 790 kg / 1742 lbs |
| wheelbase | 2180 mm / 85.8 in |
| length | 3710 mm / 146.1 in |
| transmission | 5-Speed Manual |
| gear ratios | 3.143:1, 2.24:1, 1.762:1, 1.417:1, 1.154:1 |
| final drive | 3.824:1 |
| top speed | ~213 kph / 132.4 mph |
| 0 – 60 mph | ~ seconds |
| 0 – 100 kph | ~4.1 seconds |
