Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Timing guru's---ADVISE ME!!
View Single Post
  #12 (permalink)  
Old 04-27-2012, 09:19 AM
cobalt327's Avatar
cobalt327 cobalt327 is offline
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 595 Times in 545 Posts
How much total does it have (not counting vac. adv.)? Is it all in by 3000 rpm or less? How much advance is the vacuum advance giving you?

Another thing that is often overlooked, is if the cruise rpm is less than the rpm where the mechanical advance is all in by, the vacuum advance has to make up the difference to get the best mileage and drivability. If this is a w/e "toy" then maybe mileage doesn't matter. But it may have a better 'feel' by using enough vacuum advance to get it up to at least 45 degrees BTDC at cruise rpm. The only way this would be a problem is if you did high speed cruising and the vacuum advance was set to come in at a vacuum lower than the cruise vacuum. In that case it could be over advanced, but that's where the adjustable vac. adv. can help.
Reply With Quote