Hot rodding the HEI distributor
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Performance cams will require more initial advance, all the way up to the point where- in extreme cases- the ignition advance is locked in at the total advance amount and there's no curve. This isn't a good plan for the street, but in some cases it'll be about the only way to get a cam to work on the street. In these extreme cases, vacuum advance can still be used to provide additional advance under light throttle cruise conditions providing the cam makes enough vacuum to let the vacuum advance function. In these cases an aftermarket vacuum advance cam is required. | Performance cams will require more initial advance, all the way up to the point where- in extreme cases- the ignition advance is locked in at the total advance amount and there's no curve. This isn't a good plan for the street, but in some cases it'll be about the only way to get a cam to work on the street. In these extreme cases, vacuum advance can still be used to provide additional advance under light throttle cruise conditions providing the cam makes enough vacuum to let the vacuum advance function. In these cases an aftermarket vacuum advance cam is required. | ||
| − | Initial advance recommendations, from: [http://www.demoncarbs.com/Tech/DemonSelectionGuide.asp '''Demon carbs''']. Click toolbar for various cam duration specs. | + | Initial advance recommendations, from: [http://www.demoncarbs.com/Tech/DemonSelectionGuide.asp '''Demon carbs''']. Click toolbar for various cam duration specs. '''These recommendations can be considered to be a safe starting point'''. You may well end up using more initial advance than the figures stated. |
==Mechanical, aka "centrifugal" advance== | ==Mechanical, aka "centrifugal" advance== | ||
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