Engine Compression
The manufacturer recommends using a special compression tester (49 0820 280K or 49 H075 280). Compression testers for piston engines will read only the highest pressure of the 3 combustion chambers in the rotor housing.
Warm engine to operating temperature. On 12A engine, remove both trailing spark plugs. On 13B engine remove trailing spark plug on chamber being tested only.
COMPRESSION SPECIFICATIONS
| Application | Specification |
|---|---|
| Min. Compression Pressure | 85 psi (6.0 kg/cm2 ) |
| Max. Variation | 21 psi (1.5 kg/cm2 ) |
| Compression Ratio | 9.4:1 |