1968 Opel Diplomat vs. 2009 Porsche Cayman
To start off, 2009 Porsche Cayman is newer by 41 year(s). Which means there will be less support and parts availability for 1968 Opel Diplomat. In addition, the cost of maintenance, including insurance, on 1968 Opel Diplomat would be higher. At 5,354 cc (8 cylinders), 1968 Opel Diplomat is equipped with a bigger engine. In terms of performance, 2009 Porsche Cayman (291 HP @ 6250 RPM) has 64 more horse power than 1968 Opel Diplomat. (227 HP @ 4700 RPM) In normal driving conditions, 2009 Porsche Cayman should accelerate faster than 1968 Opel Diplomat. With that said, vehicle weight also plays an important factor in acceleration. 1968 Opel Diplomat weights approximately 160 kg more than 2009 Porsche Cayman.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 1968 Opel Diplomat (427 Nm @ 3000 RPM) has 87 more torque (in Nm) than 2009 Porsche Cayman. (340 Nm @ 4600 RPM). This means 1968 Opel Diplomat will have an easier job in driving up hills or pulling heavy equipment than 2009 Porsche Cayman.
Compare all specifications:
| 1968 Opel Diplomat | 2009 Porsche Cayman | |
| Make | Opel | Porsche |
| Model | Diplomat | Cayman |
| Year Released | 1968 | 2009 |
| Engine Position | Front | Middle |
| Engine Size | 5354 cc | 3385 cc |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 227 HP | 291 HP |
| Engine RPM | 4700 RPM | 6250 RPM |
| Torque | 427 Nm | 340 Nm |
| Torque RPM | 3000 RPM | 4600 RPM |
| Engine Bore Size | 101.6 mm | 96.3 mm |
| Engine Stroke Size | 82.6 mm | 78.3 mm |
| Engine Compression Ratio | 10.5:1 | 11.1:1 |
| Top Speed | 202 km/hour | 267 km/hour |
| Acceleration 0-100mph | 10.3 seconds | 6.1 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1690 kg | 1530 kg |
| Vehicle Length | 4960 mm | 4350 mm |
| Vehicle Width | 1910 mm | 1310 mm |
| Vehicle Height | 1450 mm | 1810 mm |
| Wheelbase Size | 2850 mm | 2420 mm |
| Fuel Tank Capacity | 80 L | 64 L |
