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Downsides of wiring the Carter WCFB 4bbl velocity valves open? Jump to page : 1 Now viewing page 1 [50 messages per page] | View previous thread :: View next thread |
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56D500boy |
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Expert 5K+ Posts: 9910 Location: Lower Mainland BC | . Besides potentially increased fuel consumption if I don't keep my foot out of it. There is still the choke "interlock" that keeps the secondary butterflies from opening until the choke is fully off. I just don't get the need for the velocity valves and while I was playing with my spare Carter WCFB I held the velocity valve counter-weight "open" while I observed the throttle travel and the opening of the primary and secondary butterflies (I am working on my PCV adapter plate). The velocity valves seem like overkill. REFERENCE: https://www.mymopar.com/downloads/mtsc/086.pdf Edited by 56D500boy 2023-07-22 9:27 PM (TechnicalSericeDocumentNo86_Pg16_Secondary-VelocityValves.jpg) Attachments ---------------- TechnicalSericeDocumentNo86_Pg16_Secondary-VelocityValves.jpg (66KB - 53 downloads) | ||
PolyJ |
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Veteran Posts: 143 Location: Denver, Colorado, USA | 56D500boy - 2023-07-22 7:13 PM . Besides potentially increased fuel consumption if I don't keep my foot out of it. There is still the choke "interlock" that keeps the secondary butterflies from opening until the choke is fully off. I just don't get the need for the velocity valves and while I was playing with my spare Carter WCFB I held the velocity valve counter-weight "open" while I observed the throttle travel and the opening of the primary and secondary butterflies (I am working on my PCV adapter plate). The velocity valves seem like overkill. REFERENCE: https://www.mymopar.com/downloads/mtsc/086.pdf Hey Dave, | ||
57chizler |
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Expert Posts: 3778 Location: NorCal | The consequence of running without the secondary velocity valve is, as Justin noted, a noticeable bog when the secondaries are opened. The primaries have the accelerator pump to enrich the mixture when airflow increases with throttle opening but the secondaries don't have a pump so the velocity valve restricts the airflow at throttle opening to prevent an over-lean condition that causes the bog. As the airflow velocity increases it overcomes the counterweight(s) on the velocity valve and allows more airflow without the sudden lean condition. In theory, the velocity valve might not be fully open even at WOT...depending on the engine's airflow demand. | ||
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