Holley accelerator pump
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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 (approximately as long as it is wide, or about 0.020", up to 0.040"): | 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 (approximately as long as it is wide, or about 0.020", up to 0.040"): | ||
| − | [[File:Holley | + | [[File:Holley t-fer slot.jpg]] <br style="clear:both"/> |
From this point, if the idle speed is increased to the point where the transfer slot becomes over exposed, a poor idle and off-idle transition can be the result. One sure sign of this is the idle '''''mixture''''' screws do not cause the idle to change when turned in or out. Usually, adding initial timing to increase the idle speed will allow the throttle blades to be closed down some using the curb idle screw. This will return the idle mixture screws to normal and the idle will be smoother and cleaner, as will be the transition from idle to main circuits. | From this point, if the idle speed is increased to the point where the transfer slot becomes over exposed, a poor idle and off-idle transition can be the result. One sure sign of this is the idle '''''mixture''''' screws do not cause the idle to change when turned in or out. Usually, adding initial timing to increase the idle speed will allow the throttle blades to be closed down some using the curb idle screw. This will return the idle mixture screws to normal and the idle will be smoother and cleaner, as will be the transition from idle to main circuits. | ||
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