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Can we talk about Vacuum advance?

psw5940

Member
Joined
Apr 17, 2005
Messages
16
Location
Jax
My 75 coupe has a 1990 verson of a GM SB Crate motor, with electronic ignition. Holly 600CFM carb. I'm not a mech. so bear with me.

I know that it's hooked up to my carborator via a vacuum tube to my distributor.

What is vacuum advance?

What does it do?

Do I need to have hooked up or not?

Will it change my gas milage for better or worse? (as I was told by one person)

I'm trying to learn, any info would be helpful.

Thanks
 

fine69

Well-known member
Joined
Dec 12, 2004
Messages
975
Location
Maryland / D.C.
Corvette
'69 Convertible Vette; '72 Z28 Camaro Rally Sport
My 75 coupe has a 1990 verson of a GM SB Crate motor, with electronic ignition. Holly 600CFM carb. I'm not a mech. so bear with me.
I know that it's hooked up to my carborator via a vacuum tube to my distributor.
What is vacuum advance?
What does it do?
Do I need to have hooked up or not?
Will it change my gas milage for better or worse? (as I was told by one person)
I'm trying to learn, any info would be helpful.
Thanks

The 'How Stuff Works' website has an entire automobile area. You can click on various categories including Engines, Transmissions, Drive Train, Accessories - with easy to understand explanations (including animated graphics).

Check it out: http://auto.howstuffworks.com/car.htm, or if you want to read specifically on ignitions, check out: http://www.howstuffworks.com/ignition-system.htm


Ralph
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
My 75 coupe has a 1990 verson of a GM SB Crate motor, with electronic ignition. Holly 600CFM carb. I'm not a mech. so bear with me.

I know that it's hooked up to my carborator via a vacuum tube to my distributor.

What is vacuum advance?

What does it do?

Do I need to have hooked up or not?

Will it change my gas milage for better or worse? (as I was told by one person)

I'm trying to learn, any info would be helpful.

Thanks

Click on this link:

http://lbfun.com/Corvette/Tech/vettetech.html

Then scroll down to "Distributors & Timing", and click on "Timing 101 Article.pdf"; I think it will answer your questions. :)
 

psw5940

Member
Joined
Apr 17, 2005
Messages
16
Location
Jax
JohnZ and others, thanks again for all the info. I printed some of it to add to my library.
 

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