A QUICK QUESTION ABOUT MANIFOLD VACUUM
Some ignorance about idle timing on this thread. 25* with a mild cam.
The engine in question has well over 200* @ 050 duration on the intake. It has 9.3:1 CR.
Consider this engine: 10.75:1 CR. 197* @ 050 intake duration. Note that, all else being equal, a higher CR reduces the amount of idle timing reqd. These are the specs for the engine in my GTO, as it came from the factory. It idled with 26*. 6* initial with 20* added via MVA. With the current cam, it idles with 48* in Drive with a near smooth idle. Many stock Chevs idled with 24*.
Note below the idle timing with short cams.
Some ignorance about idle timing on this thread. 25* with a mild cam.
The engine in question has well over 200* @ 050 duration on the intake. It has 9.3:1 CR.
Consider this engine: 10.75:1 CR. 197* @ 050 intake duration. Note that, all else being equal, a higher CR reduces the amount of idle timing reqd. These are the specs for the engine in my GTO, as it came from the factory. It idled with 26*. 6* initial with 20* added via MVA. With the current cam, it idles with 48* in Drive with a near smooth idle. Many stock Chevs idled with 24*.
Note below the idle timing with short cams.