does anyone have a basic map for a basic normally aspirated (650 demon carb)small block chevy stock engine with hydraulic flat tappet cam? just something in the ballpark?
sbc map
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Todd Charles
- Posts: 2
- Joined: Mon May 24, 2004 5:08 pm
You might start with somethin
You might start with something like a "mechanical distributor" curve. Fill in you RPM values from 500 to 4000 or so then fill in the MAP values from 20 to 100. Now under the 500 RPM bin fill in the entire column with "10". Go to the next RPM bin (say 1000 RPM) and fill the under column with "12" or "14". Just work yourself accross the RPM bins until you get to 3000 RPM. At this point you should be maxed out to 34° or so. Just make the transitions between bins smooth as possible. Fill the rest of the RPM columns with 34° values.
OK, now you have a nice conservitive spark curve that should perform well and give you no detonation problems. After you are up and running you will want to tune for fuel milage. Start by adding timing in the "20-30-40" bins. You will probably want to keep your timing in the "100-90-80" bins at or under 36°. These are your highest load bins (full throttle). The lower # are part throttle. This should give you a good start.
Todd
OK, now you have a nice conservitive spark curve that should perform well and give you no detonation problems. After you are up and running you will want to tune for fuel milage. Start by adding timing in the "20-30-40" bins. You will probably want to keep your timing in the "100-90-80" bins at or under 36°. These are your highest load bins (full throttle). The lower # are part throttle. This should give you a good start.
Todd