Originally posted by dmorris1200
Vacuum advance is calculated into your total advance figures. When you accelerate under mild load your engine will see mechanical+vacuum advance. This has been discussed in older threads and links were actually provided to websites that dealt with this issue.
While I am aware of what you are referring to, since there is NO
vacuum under WOT I respectfully disagree. Also if the vacuum advance was needed to set your timing the manufacturers would tell you to leave it connected when setting the timing. To my knowledge no manufacturer even suggests setting the timing with the vacuum advance connected. They all state that you should dis-connect and plug it when setting the timing. The same is true with where the vacuum advance hose should be connected (ported or full vacuum). I use full vacuum and that works best for me. Someone else may find that the ported connection works best for them. Peace!