1991 Ford Sierra vs. 1984 Pontiac Grand Am
To start off, 1991 Ford Sierra is newer by 7 year(s). Which means there will be less support and parts availability for 1984 Pontiac Grand Am. In addition, the cost of maintenance, including insurance, on 1984 Pontiac Grand Am would be higher. At 2,469 cc (4 cylinders), 1984 Pontiac Grand Am is equipped with a bigger engine. In terms of performance, 1984 Pontiac Grand Am (89 HP @ 4400 RPM) has 14 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM) In normal driving conditions, 1984 Pontiac Grand Am should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 1991 Ford Sierra weights approximately 15 kg more than 1984 Pontiac Grand Am.
Let's talk about torque, 1984 Pontiac Grand Am (179 Nm @ 2800 RPM) has 27 more torque (in Nm) than 1991 Ford Sierra. (152 Nm @ 2200 RPM). This means 1984 Pontiac Grand Am will have an easier job in driving up hills or pulling heavy equipment than 1991 Ford Sierra.
Compare all specifications:
| 1991 Ford Sierra | 1984 Pontiac Grand Am | |
| Make | Ford | Pontiac |
| Model | Sierra | Grand Am |
| Year Released | 1991 | 1984 |
| Engine Position | Front | Front |
| Engine Size | 1751 cc | 2469 cc |
| Engine Cylinders | 4 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 75 HP | 89 HP |
| Engine RPM | 4500 RPM | 4400 RPM |
| Torque | 152 Nm | 179 Nm |
| Torque RPM | 2200 RPM | 2800 RPM |
| Engine Bore Size | 82.5 mm | 101.6 mm |
| Engine Stroke Size | 82 mm | 76.2 mm |
| Engine Compression Ratio | 21.5:1 | 9.0:1 |
| Fuel Type | Diesel | Gasoline |
| Number of Seats | 5 seats | 4 seats |
| Vehicle Weight | 1145 kg | 1130 kg |
| Vehicle Length | 4430 mm | 4520 mm |
| Vehicle Width | 1700 mm | 1710 mm |
| Vehicle Height | 1370 mm | 1340 mm |
| Wheelbase Size | 2620 mm | 2630 mm |
