Subject: Ignition Timing and Dwell Angle Specs Models: 911, Turbo ALL
Bulletin Number: 77 – 01
Ignition timing must be set according to specifications and markings on crankshaft pulley, as given in following table:
Ignition Timing/Dwell Angle Specifications
Pulley markings – PORSCHE 911
Years: 65, 66, 67, 68 69, 70, 71 72, 73, 74, 75, 76, 77
Note
All ignition timing adjustments and checking should be made with engine at operating temperature.
| Model Year | Model | Ignition Timing | Dwell Angle |
| 1965/66/67 1967 1968 1969 1969 1969 1970/71 1970/71 1970/71 | 911 911S 911/911L 911T 911E 911S 911T 911E 911S | 30° BTDC at 6000 30° BTDC at 6000 30° BTDC at 6000 RPM 35° BTDC at 6000 RPM 30° BTDC at 6000 RPM 30° BTDC at 6000 RPM 35° BTDC at 6000 RPM 30° BTDC at 6000 RPM 30° BTDC at 6000 RPM | 38° + 3° 38° + 3° 38° + 3° 40° + 3° 38° + 3° 38° + 3° 40° + 3° – Marelli Distributor 38° + 3° – Bosch Distributor 38° + 3° 38° + 3° |
| Model Year | Model | Ignition Timing | Dwell Angle |
| 1972/73 1972/73 1972/73 1974 1974 1975 1976 1977 | 911T 911E 911S 911 911S 911S 911S 911S | 5° ATDC at Idle 5° ATDC at Idle 5° ATDC at Idle 5° ATDC at Idle 5° ATDC at Idle 5° ATDC at Idle 5° ATDC at Idle TDC + 2° (Calif.) Hose on | 37°+3° – Marelli Distributor 38°+3° – Bosch Distributor 38°+3° 38°+3° 37°+3° – Marelli Distributor 38°+3° – Bosch Distributor 37°+3° – Marelli Distributor 38°+3° – Bosch Distributor 38°+3° 37°+3° – Marelli Distributor 38°+3° – Bosch Distributor 38°+3° |
Pulley markings – PORSCHE TURBO
| Model Year | Model | Ignition Timing | Dwell Angle |
| 1976 1977 | Turbo Turbo | 5° ATDC – Hose on 7° + 2° ATDC – Hose on | N/A N/A |
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