Initial timing based on cam duration

[FishFry]

Just working my way trough Grumpy's links here, I came across this.



Not sure if I'm reading that right, but it looks like that for my cam 211/219 @ 50 I should be at 11-19 just for the mechanical advance, and together with vacuum advance at 26-30 altogether. Is that right?

Also... is this just vor 8 cylinders or does the same apply also to an inline 6?

Follow up question: Not sure if my 261 qualifies as "performance engine", but it idles at around 12-15 hg with 29 deg. timing (900 rpm).
So maybe (according to tat chart) I would benefit from a vacuum canister - actually I have no idea what exactly that does to the ignition, I only know it is used for wipers and brakes.

Thanks, Frank

 

[Thunderbolt]

The vacuum canister is real simple, it advances the timing when intake vacuum is high (low engine load, works if the cam is not too radical).

 

[FishFry]

Ohhh.... it's about a vacuum can on a dizzy, not a vacuum reservoir like for a brake booster.

Now I get it.

Thanks, Frank