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.
|production years||1973 – 1975|
|built at||Turin, Italy|
|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|
|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|
|gear ratios||3.143:1, 2.24:1, 1.762:1, 1.417:1, 1.154:1|
|top speed||~213 kph / 132.4 mph|
|0 – 60 mph||~ seconds|
|0 – 100 kph||~4.1 seconds|