View Single Post
  #6  
Old 05-15-2019, 11:18 PM
babywag's Avatar
babywag babywag is online now
out of order
 
Join Date: Jun 08, 2005
Location: Land of froot loops and cukcoo-nuts, CA
Posts: 9,450
ported vacuum is zero @ idle.
manifold vacuum or ported vacuum are identical off/above idle.

with no load having xx* of vacuum advance is not a big deal especially idle or lower rpm.
under heavy load having xx* of vacuum advance can be a big deal aka detonation.
I suggest you plug in a vacuum gauge and watch it.
It is very easy to hit lower vacuum even at part throttle.
You will not have 16* vacuum advance for long using the skinny pedal, even lightly.
Any decrease in vacuum = decrease in vacuum advance.

having vacuum advance in place @ idle tends to give a snappier throttle response vs. having it on ported where cracking the throttle results in a big change in timing.

folks have been arguing about this stuff for decades.
__________________
Tony
'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
Reply With Quote