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FJR Motorcycle Forums
Technical & Mechanical Problems
Audiovox Cruise Control-Problem Solved?
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<blockquote data-quote="Fred W" data-source="post: 432634" data-attributes="member: 3828"><p>Thanks for the reply, Alan. So you're saying you think that the location in the throttle body they pick-off the vacuum for the FPR and MAP sensor is different and makes it less significant. I'll buy that.</p><p></p><p>Thinking about this further I can see that each of the throttle bodies will actually experience negative pulses of pressure (vacuum) related to the firing order. As each vacuum port pulses it will want to pull air from any other ports connected as well as the AVCC. Once the AVCC reservoir reaches equilibrium it would not flow back to the port but any other ports will be at a lower pressure than the "spiking" port and so would flow to it.</p><p></p><p>[Light bulb over head] I get it now!! The peak vacuum at the ports and at the reservoir will be lower than it could be with individual check valves. The individual check valves would act as rectifiers on the multi phase pulsating vacuum input and the reservoir acts as the filter capacitor. ;-)</p><p></p><p>Time to hit the local NAPA</p></blockquote><p></p>
[QUOTE="Fred W, post: 432634, member: 3828"] Thanks for the reply, Alan. So you're saying you think that the location in the throttle body they pick-off the vacuum for the FPR and MAP sensor is different and makes it less significant. I'll buy that. Thinking about this further I can see that each of the throttle bodies will actually experience negative pulses of pressure (vacuum) related to the firing order. As each vacuum port pulses it will want to pull air from any other ports connected as well as the AVCC. Once the AVCC reservoir reaches equilibrium it would not flow back to the port but any other ports will be at a lower pressure than the "spiking" port and so would flow to it. [Light bulb over head] I get it now!! The peak vacuum at the ports and at the reservoir will be lower than it could be with individual check valves. The individual check valves would act as rectifiers on the multi phase pulsating vacuum input and the reservoir acts as the filter capacitor. ;-) Time to hit the local NAPA [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Audiovox Cruise Control-Problem Solved?
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