Timed vs full???

[Crawdad]

Didn't you say you were installing a Edelbrock performer carb right? If you choose to use full manifold vacuum, connect the vacuum line from the distributor to the 3/16" port to the right of the PCV connection, if you choose to use the timed connection, use the one on the left. The difference is that the full manifold vacuum port comes right off the intake manifold so it has vacuum all the time. The timed port is just above the throttle valve so there's no vacuum at idle, but as soon as you crack the throttle, there's vacuum there. Do you remember when I told you to get a vacuum gauge? If you choose to use the manifold vacuum source, you need to put a T in the line to connect your vacuum gauge to adjust your mixture. This is because connecting the distributor to full manifold affects the idle speed and mixture. Using full manifold vacuum will also make the starter work just a little harder getting the engine going. I also agree with Bucket of Bolts second paragraph.

I have tried to use the timed connection before. What I ran into is that at the moment I cracked the throttle when I was taking off, the shock to the distributor of going from zero vacuum advance to full vacuum advance caused a bad hesitation. If I were going to try to use vacuum advance again, I'd probably try full manifold.

I think a lot of it depends on your distributor and how much vacuum advance it pulls in. I guess I'm not using vacuum advance right now because I don't care that much about economy because I don't drive my Bronco every day. It just runs too good for me to mess with it. I'm sure there are folks that will disagree with what I've said but it's just my opinion..and everybody's got one right?

JD

Thx JD! I will get that guage as you said. Many forums I've read say that this will not be the last time I use that guage. I read where one guy checks his guage everytime he changes oil. Thx again!