AVS 2 help

[toolmanmike]

I'm usually not concerned about total timing at rpm with the vacuum advance connected. It can be up around 50° and be ok as long as there is no detonation. Depending on the engine, the initial timing + the mechanical is usually in the mid 40 range and an engine will run fine without any vacuum advance. The vac. advance is there for part throttle and cruise efficiency.

 

[gtxrt]

So, the whole timing this is a bit odd. I removed the vac adv... and the base timing was 12* and total was 24*, only a 12* swing... and IMHO 24* is nowhere near enough. Just out of curiosity, I wanted to look with vac adv on.. base was 17* and total 40*. I don't take that to heart, but does a net of 11* sound right for a vac adv?

make sure you are checking the total timing at least at 3800 rpms with vacuum disconnected. if still at 24* then before recurving the dist I would set the base timing at 20* giving you 32* total. The total with vacuum hooked up will give you 48* for cruising which is fine.