Specifications
The Espada used a semi-monocoque unibody, constructed of pressed sheet steel and square section steel tubing. The hood was constructed of aluminum. This chassis was a new design manufactured by Marchesi of Modena, the firm that also constructed Miura and Islero chassis. Bare chassis were shipped from Marchesi to Bertone, where bodywork, paint and trim were added prior to final assembly at the Lamborghini factory.[4] The steel chassis and bodywork suffered from rust issues, with journalist Denis Jenkinson observing visible rust on a car with 10,000 miles during a 1972 road test.[5]
Suspension was based on the earlier 400 GT 2+2 design. It was fully independent, with unequal length double wishbones, coil springs, hydraulic shock absorbers and anti-roll bars. Four wheel disc brakes were manufactured by Girling. All calipers had three pistons, with larger calipers used in the front. Solid discs were used at first, with vented discs added for the Series II Espada. The steering box was a worm-and-peg type manufactured by ZF and mounted at the top front of the chassis, with a very long steering column. Power steering would be offered on the Series III Espadas. Series I and II Espadas were originally fitted with Pirelli Cinturato 205VR15 tyres (CN72), while Series II cars used 215/70VR15 Cinturato CN12 tyres.[4]
Twin fuel tanks held 93 L of gasoline. Two fuel fillers were hidden behind black cosmetic grilles in both C-pillars.[4]
The 3929 cc Lamborghini V12 engine was virtually unchanged from the engine used in the 400 GT 2+2. This engine, based on Giotto Bizzarrini's original design for Lamborghini, had an aluminum alloy crankcase with cast-iron cylinder liners, aluminum pistons, 24 valves (two per cylinder) and two chain-driven overhead camshafts per bank. Cylinder bore was 82 mm and stroke was 62 mm. Compression ratio on series I engines was 9.5:1, which increased to 10.7:1 in the series II/II engines. Six Weber 40DCOE side-draft carburetors were equipped, along with a single distributor for ignition. Wet sump lubrication was used, with an oil capacity of 14 L. The weight of the engine alone was 232 kg, or 293 kg including the transmission. Power output of series I cars was stated as 325 hp at 7,200 rpm, while Series II/III cars produced a stated 350 hp at 7,500 rpm.[4][6]
The Espada's transmission was mounted longitudinally, inline with the engine. Most Espadas were equipped with a Lamborghini-designed 5-speed manual transmission with hydraulically operated clutch. The internal components of this transmission were identical to those used in the Miura and Islero, with the transmission casing also shared with the Islero but differing from the Miura, due to that model's transverse mid-engine layout.[4]
From 1974, the Series III Espada could be ordered with a Chrysler Torqueflite 3 speed automatic transmission. This was an unpopular option, as acceleration and top speed were reduced.[4] 55 Espadas were built with this transmission.[7]