My truck isn't going to run at 0° timing. Am i misinterpreting that? Are you just saying look where it's at now and and idle down till it has mechanicaly undadvanced all the way?
I have timing marks out to 40°. I've got it set now between 12 and 13° base timing. When the vacuum advance kicks in all the way at low rpm it's adding about 10°-11°. So at low revs(1300ish) no load I'm at about 30°(give or take 2° for hard to read marks) total(very little mechanical advance kicked in yet).
MSD Says that The Vacuum advance is set at 10° from the factory and it seems close to that.
here is a graph of what the centrifugal advance is set at from off the instructions:
It's a bit slow and hits 21° total at 4k RPM. Should i get the kit and switch it out for one of these that are quicker?
Also what's the max degrees I should let it advance?
It's hard to tell in the photo but you can change the bump stop to limit total timing and swap springs to let it in faster or slower.
Whoa that's alot of things in that post. Here's the sum up for the current config:
10° Vacuum advance possible
21° Mechanical advance possible@ 4000
(I typically cruise at 2500 rpm which sits me about 60mph so i never see all
21 centrifugal on the highway but will see them in a quick acceleration shifting later.)
12°-13° Base timing
Theoretical timing at Cruise (60mph) is
13° base +
12° centrifigal= (according to chart) and
(assuming vacuum is still operating fully)
I would imagine at 4000 rpm the vacuum isn't operating fully (i'd never be going this quick cruising anyway) so the max timing there would be around 31° + any vacuum advance that could still occur.
Edit: After all that, assuming the dist. is acting as stated in the instructions from the factory my max centrifugal advance is 21°. So I'd subtract that from 38 which would give me a max base timing of 17?
I figure if I go that high my vacuum advance will hit the low 40's around 3k while cruising. 13° keeps it right at 38 for worst case scenario. I think it'll do about right where its at.