- Joined
- Apr 8, 2015
- Messages
- 521
- Reaction score
- 66
- Location
- Upstate NY
- My Car
- 71 Mach 1, 351c 4v, C6 trans, grabber blue with white interior
I was doing some routine maintenance and thought to check some timing numbers. Removed the 2 vacuum hoses to the distributor and plugged them in order to check initial timing. Timing light indicated it was 17ish BTDC when I remember setting it to around 8 BTDC. 17+ 24 mechanical is too much to have so I turned the distributor counterclockwise to retard the timing back to the 8 BTDC I wanted.
Did some other checks , in addition to checking mechanical advance and went back to the initial timing setting. This time it is ATDC somehow, so I advanced the distributor to get the 8 BTDC I wanted. Vacuum lines still disconnected and plugged. Idle set to around 600 RPM to avoid mechanical changing timing.
How does timing change with the vacuum lines removed and low idle? Engine was at a hotter temp than when I initially checked things but how does temp change timing, if it even does??
Did some other checks , in addition to checking mechanical advance and went back to the initial timing setting. This time it is ATDC somehow, so I advanced the distributor to get the 8 BTDC I wanted. Vacuum lines still disconnected and plugged. Idle set to around 600 RPM to avoid mechanical changing timing.
How does timing change with the vacuum lines removed and low idle? Engine was at a hotter temp than when I initially checked things but how does temp change timing, if it even does??