1961 AC Ace vs. 1991 Ford Sierra
To start off, 1991 Ford Sierra is newer by 30 year(s). Which means there will be less support and parts availability for 1961 AC Ace. In addition, the cost of maintenance, including insurance, on 1961 AC Ace would be higher. At 2,553 cc (6 cylinders), 1961 AC Ace is equipped with a bigger engine. In terms of performance, 1961 AC Ace (100 HP @ 5500 RPM) has 25 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 1961 AC Ace should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 1991 Ford Sierra weights approximately 332 kg more than 1961 AC Ace.
Let's talk about torque, 1961 AC Ace (180 Nm @ 2000 RPM) has 28 more torque (in Nm) than 1991 Ford Sierra. (152 Nm @ 2200 RPM). This means 1961 AC Ace will have an easier job in driving up hills or pulling heavy equipment than 1991 Ford Sierra.
Compare all specifications:
| 1961 AC Ace | 1991 Ford Sierra | |
| Make | AC | Ford |
| Model | Ace | Sierra |
| Year Released | 1961 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 2553 cc | 1751 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 100 HP | 75 HP |
| Engine RPM | 5500 RPM | 4500 RPM |
| Torque | 180 Nm | 152 Nm |
| Torque RPM | 2000 RPM | 2200 RPM |
| Engine Bore Size | 82.6 mm | 82.5 mm |
| Engine Stroke Size | 79.5 mm | 82 mm |
| Engine Compression Ratio | 7.8:1 | 21.5:1 |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 813 kg | 1145 kg |
| Vehicle Length | 3860 mm | 4430 mm |
| Vehicle Width | 1490 mm | 1700 mm |
| Vehicle Height | 1250 mm | 1370 mm |
| Wheelbase Size | 2290 mm | 2620 mm |
| Fuel Tank Capacity | 54 L | 60 L |
