How to rebuild automotive carburetors
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The Holley carb uses a power valve to supply additional fuel when the engine vacuum drops (and presumably the engine load increases). The amount of fuel it supplies is equal to about 7-8 jet numbers. If the rear power valve (if present) is removed, the threaded hole it was in has to be plugged. The jets have to be enlarged 7-8 jet sizes to compensate for the loss of fuel flow it provided. <br style="clear:both"/> | The Holley carb uses a power valve to supply additional fuel when the engine vacuum drops (and presumably the engine load increases). The amount of fuel it supplies is equal to about 7-8 jet numbers. If the rear power valve (if present) is removed, the threaded hole it was in has to be plugged. The jets have to be enlarged 7-8 jet sizes to compensate for the loss of fuel flow it provided. <br style="clear:both"/> | ||
| − | === | + | ===Holley idle transfer slot=== |
| − | Baseline the throttle blades to give a 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: |
[[File:Holley transferslot.jpg]] <br style="clear:both"/> | [[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. | ||
===Secondary vacuum chamber=== | ===Secondary vacuum chamber=== | ||
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