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I'm well aware that no two engines will operate the same with the same timing, but I'm wondering what is the most common timing (degrees before top dead center) used on engines like mine by those of you out there?
Specifics on my engine
350 CID CSB
64cc Alumn Heads 2.02/1.60 72cc
190 intake runners/72cc exhaust runners
Competiton XE262H Cam
Roller rockers
Edelbrock Performer Intake
Edelbrock 600 Carb
Ignition is degrees before top dead center, depending on fuel octane and compression ratio 36-38 degrees
Thanx for catching my typo error, but I'm referring to the number of degrees you'd adjust into an "old iron" distributor with a timing light. As I remember 12º before TDC used to be about the stock setting on old stock SBC engines. I'm thinking more about 16º before TDC might be more appropriate.
Mine is set to 10 to 12 degrees with the vacuum advance disconnected and plugged. You may have to adjust the idle speed up. Watch the mechanical advance come in as you rev the engine. Mine starts to come in around 1200 rpm and is all in around 2800 rpm for an additional 10 degrees for a total around 20 to 22 degrees. Now hook up the vacuum advance and check you idle speed. Adjust back down to normal. Your timing should jump up to around 22 to 26 degrees. Now rev the engine and you should see the 32 to 36 degrees. I have attached a link explained by Lars Grimswuld, should be in everybody's file.
http://www.lbfun.com/warehouse/tech_...t%20Timing.pdf
What timing used is based upon what combo of parts you are using.
in my performance cars I usually set the initial as high as it will still start with fully warmed up, then what trial and error tells me the total/full advance should be, or where it runs best-et/mph.... OR seat of the pants & plug reading. This can also tell you, or lead you to,..finding out that you have too lil cylinder pressure for the cam.
Thanx for the referrence! Using and adjustable timing light is a great idea to check total timing! Why didn't I think of that myself!
Mr. D