The 3.4-liter boxer Porsche M97.21 engine was produced by the concern from 2005 to 2009 and was installed on advanced modifications of the Cayman S coupe or Boxster S cabriolet in the back of 987. There was a slightly more powerful version of this power unit under its M97.22 index.
Engines of M97-line: M97.20, M97.21.
Specifications
| Production years | 2005-2009 |
| Displacement, cc | 3387 |
| Fuel system | distributed injection |
| Power output, hp | 295 |
| Torque output, Nm | 340 |
| Cylinder block | aluminum H6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 96 |
| Piston stroke, mm | 78 |
| Compression ratio | 11.1 |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | VarioCam Plus |
| Turbocharging | no |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 7.75 |
| Fuel type | petrol |
| Euro standards | EURO 4 |
| Fuel consumption, L/100 km (for Porsche Cayman S 2008) — city — highway — combined |
15.3 7.8 10.6 |
| Engine lifespan, km | ~240 000 |
| Weight, kg | 191 |
The engine was installed on:
- Porsche Boxster 2 (987) in 2006 – 2009;
- Porsche Cayman 1 (987) in 2005 – 2009.
Disadvantages of the Porsche M97.21 engine
- The most famous problem of the M97 family of units is seizures in the cylinders;
- These motors did not escape the massive problem with the intermediate shaft bearing;
- Also, there are very high requirements for lubrication and often turns the liners;
- By a run of 150,000 km, it usually requires replacing the timing chain;
- The weak point of the engine is its cooling system and in particular the water pump.
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