Here is the background. 6/74 FJ40. Engine was de-smoged and it has headers. I was told the original owner milled down the heads for better compression but compression now is just OK. Everything else is pretty original. Oh and I’m at 9000 ft elevation.
I set timing with a light and it idles faster and I get greater vacuum when I advance the BB below the pointer. In fact I can advance it so the BB is out of sight, below the edge of the inspection opening, and it seems to run best there. But of course I loose any visual reference once the BB goes out of sight, though I can try and judge how far by how much I’m turning the distributor. Despite running in this range of advancement, I’ve never detected pinging.
I’m confident the distributor is installed correctly. The rotor is pointed right at #5 when it’s at TDC.
I think the BB represents 8 degrees BTDC. I’ve read there is a mark for TDC but I haven’t found that. If I’m running it with the BB right at the lower edge of the opening, what would my timing be? And how can I time this rig to the optimal setting? Thanks for any suggestions or insight.
I set timing with a light and it idles faster and I get greater vacuum when I advance the BB below the pointer. In fact I can advance it so the BB is out of sight, below the edge of the inspection opening, and it seems to run best there. But of course I loose any visual reference once the BB goes out of sight, though I can try and judge how far by how much I’m turning the distributor. Despite running in this range of advancement, I’ve never detected pinging.
I’m confident the distributor is installed correctly. The rotor is pointed right at #5 when it’s at TDC.
I think the BB represents 8 degrees BTDC. I’ve read there is a mark for TDC but I haven’t found that. If I’m running it with the BB right at the lower edge of the opening, what would my timing be? And how can I time this rig to the optimal setting? Thanks for any suggestions or insight.