Cadillac Allante history 1991

1991 CADILLAC ALLANTE

The Allante was once again available as a convertible or as a convertible hardtop that included both a convertible top and a removable all-aluminum hardtop.

The engine (cast iron cylinders in aluminum) was the same 4.5 liter V8 and F-7 four-speed automatic transaxle that was used in 1990. However, the engine had a new air intake resonator for quieter performance. The resonator remove a little bit of the roar when driving up a hill, but the exhaust note was the same as in 1990. Engine power was improved through the use of straighter intake ports and larger valves (45mm intake and 38mm exhaust). The exhaust was evacuataed through thin-wall, cast iron manifolds that were shaped for minimum flow resistance. Also, to help reeduce oil aeration, a new gearotor-type oil pump was added to the engine.

Final drive ratio was 3.21:1. The Allante's chassis was also upgraded with the second-generation speed-dependent damping system added as standard equipment. With this system, damping-select time was reduced for faster response to road inputs and vehicle speed changes. It also offered enhanced lift and dive control as well as improved diagnostics. Allante continued to offer the Bosch III antilock braking system and traction control as standard equipment. The traction control system was refined for 1991 with the addition of rubber isolated plungers that reduced noise when the sytem was engaged. Allante's variable-assist rack-and-pinion power steering system was also improved with a revised pump and adapter that resulted in quieter operation and enhanced reliability.

The convertible featured an improved, Phase II ergonomically-designed, power-fastening, folding soft top.

Inside, the Allante's previous light charcoal interior carpeting and floor mats were replaced with dark charcoal counterparts.

ENGINE

90-degree, overhead valve, V-8, aluminum block and cast iron cylinder liners, cast iron cylinder heads
Displacement: 273 cu. in. (4.5 liters)
Bore & Stroke: 3.62 in. x 3.31 in.
Compression ratio: 9.0:1
Brake horsepower: 200 @ 4400 rpm
Torque: 270 lb.-ft. @ 3200 rpm
Five main bearings
Roller hydrauic valve lifters
Tuned port fuel injection

CHASSIS

Wheelbase	99.4 in	2.525 m
Overall length	178.7 in	4.539m
Height	51.2 in	1.3m
Width	73.5 in	1.867m
Front tread	60.3 in	1.532m
Rear tread	60.4 in	1.534m
Standard tire	Goodyear Eagle VL P225/55VR16

TECHNICAL

Transmission: THM-F7 automatic four-speed transaxle (includes viscous converter clutch)
Steering: Power-assisted rack and pinion
Steering Ratio: 15.6:1
Front suspension: Independent MacPherson strut with coil springs, strut-type shock absorbers, integral-in strut and electronic variable, and stabilizer bar
Rear suspension: Fully independent transverse monoleaf with integral-instrut electronic variable shock absorbers, no rear stabilizer
Brakes: Power assisted front disc and rear disc with Bosch II ABS
Body construction: integral body-frame
Fuel tank: 22 gal.
Curb Weight: 3537 lb