vac advance
Thread Starter
Racer
Joined: Sep 2002
Posts: 392
Likes: 0
From: Iowa
vac advance
While checking the timing on initial start up on my engine here is what I found. With vac adv not connected total timing was 40 deg. with vac adv connected it was 58 to 60 deg. How do I correct this to 36 deg total. The main changes I made are a performer manifold, and a mild comp cam. I also pulled the emissions equip.
Safety Car
Joined: Jan 2001
Posts: 4,660
Likes: 3
From: South Central Louisiana
St. Jude Contributor
Re: vac advance (jetech)
From what I have seen you are right on. 36 degrees is what you want, total timing WITHOUT vac advance connected. The vac advance will bring it into the 50-60 range off of idle but let go before wide open throttle. You can retard your timing a little to get the 36 instead of 40, but your motor may prefer the advance.
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Re: vac advance (jetech)
You could get an adjustable aftermarket unit. thes can be tailored for when and how much the vacuum advance works.. Real nice... Cranes makes a complete kit with instructions.
Le Mans Master
Joined: Feb 1999
Posts: 6,807
Likes: 0
From: Hoosier
Cruise-In III Veteran
Re: vac advance (jetech)
You may want to get the aftermarket kit mentioned and try stiffer springs.. Look at getting the 36 degrees at about 2800 rpm with an intial of 10-14.
Check the tech tips. Lars has an excellent writeup explaining the whole process.
Check the tech tips. Lars has an excellent writeup explaining the whole process.
