Hot rodding the HEI distributor
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What happens sometimes is the initial timing is too low, causing the primary butterflies to be opened so far to get the engine to idle that the engine is not running on the idle circuit; instead it is running mostly on the transition slots. If this is the case, the engine will idle high when out of gear and then the idle speed will drop down once it's put in gear, and the off-idle response will be poor at best. This can be magnified by not having enough torque converter stall rpm and to a lesser extent not enough rear gear ratio. | What happens sometimes is the initial timing is too low, causing the primary butterflies to be opened so far to get the engine to idle that the engine is not running on the idle circuit; instead it is running mostly on the transition slots. If this is the case, the engine will idle high when out of gear and then the idle speed will drop down once it's put in gear, and the off-idle response will be poor at best. This can be magnified by not having enough torque converter stall rpm and to a lesser extent not enough rear gear ratio. | ||
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| + | ===Holley idle transfer slot=== | ||
| + | The drawing below shows the transition slot as seen with the carb held upside down. The drawing on the Left shows an overexposed transition slot. Baseline the throttle blades to give a transfer slot that looks like the image below, Right: | ||
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| + | [[File:Holley transferslot.jpg]] <br style="clear:both"/> | ||
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| + | {{Note1}}Other carbs have similar transition circuits, and they need to have the throttle blades in the 'sweet spot' same as the Holley. If the throttle blades are open too far, a poor idle and off-idle transition can be the result. | ||
==Initial advance== | ==Initial advance== | ||
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