1973→1975 Lancia Stratos Group 4


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.

1973→1975 Lancia Stratos Group 4 1973→1975 Lancia Stratos Group 4 1973→1975 Lancia Stratos Group 4

 

In Detail

typeRacing Car
production years1973 – 1975
built atTurin, Italy
engineInline-4
block materialCast Iron Block
valvetrain4 Valves per Cyl
fuel feed48 IDF Weber Carburetors
bore93 mm / 3.66 in
stroke60 mm / 2.36 in
power197.6 kw / 265 bhp @ 7800 rpm
body / frameMonocoque Steel Spaceframe
driven wheelsRWD
wheel typeCampagnolo
front tires205/50ZR15 Pirelli P Zero C
rear tires225/50ZR15 Pirelli P Zero C
front brakesAP Vented Discs w/AP/Lockheed 4-Piston Aluminum Monobloc Calipers
f brake size28 x 267 mm / 1.10 x 10.51 in
rear brakesAP Vented Discs w/AP/Lockheed 4-Piston Aluminum Monobloc Calipers
r brake size28 x 267 mm / 1.10 x 10.51 in
front wheelsF 38.1 x 21.6 cm / 15 x 8.5 in
rear wheelsR 38.1 x 21.6 cm / 15 x 8.5 in
f suspensionStrengthened wishbones w/Eibach Springs over Bilstein Telescopic Dampers, Adjustable Anti-Roll Bar
r suspensionMcPherson Strut w/Eibach Springs over Bilstein Telescopic Dampers, Adjustable Anti-Roll Bar
dry weight790 kg / 1742 lbs
wheelbase2180 mm / 85.8 in
length3710 mm / 146.1 in
transmission5-Speed Manual
gear ratios3.143:1, 2.24:1, 1.762:1, 1.417:1, 1.154:1
final drive3.824:1
top speed~213 kph / 132.4 mph
0 – 60 mph~ seconds
0 – 100 kph~4.1 seconds