Engine Compression: V12
WARNING: This page does not describe the selected car, but rather 34 other vehicles, including the 2001 BMW Z8, 2001 BMW Z3, 2001 BMW X5, 2001 BMW M5, and 2001 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
Deactivate fuel injection system by removing Digital Motor Electronics (DME) master relay and disconnecting ignition coils before performing compression test. Ensure battery is fully charged. Remove DME master relay. Remove engine covers as necessary to access spark plugs. Remove spark plugs. See SPARK PLUGS in REMOVAL, OVERHAUL & INSTALLATION article. Screw Test Adapter (11-0-226) by hand into spark plug thread. Attach Pressure Gauge (11-0-224) to adapter to check compression pressure.
COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression Pressure | ||
| 6-Cylinder | 142-156 psi (10-11 kg/cm2 ) | |
| V8 | 170-199 psi (12-14 kg/cm2 ) | |
| V12 | 142-170 psi (10-12 kg/cm2 ) | |