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02-29-2008, 07:00 AM
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PVCR to jet comparison chart.
Hey guys, cant find my PVCR to Jet size comparison chart.
Anyone have a link to one on line? Thanks! John  No problem i found it. Thanks! Last edited by boss68; 02-29-2008 at 09:12 AM. 
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02-29-2008, 12:53 PM
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That would be a handy link... care to share?
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03-01-2008, 10:13 AM
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Hi Curtis,
I found the old one, didn't get any replies leading to a link so i'm not sure if there is one on line? The one i have was and can be made with a Machinery's handbook and a Starrett precision drill guide. There was a reply on another Forum that suggests a surface area chart can be seen on the Demon Carbs site. John
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03-01-2008, 12:48 PM
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OK, I don't mind asking questions any more when i'm really stumped. What is "PVCR"? Does it have something to do with Poly Vinyl Cloride? or maybe "positively vented crankcase something"? LOL
Never mind, I found it!!! The authors report a simple method for decreasing the valley current density and therefore increasing the peak-to-valley current ratio (PVCR) so that it reached 360 at room temperature in GaAs/In0.59Ga0.41As/InAs multi-stepped quantum well resonant interband tunnelling diodes (MSQW RITDs) using a GaAs undoping spacer layer. The PVCR is better data than that of other RITDs, to the knowledge of the authors. Multiple peak resonant tunnelling has been observed in this structure as the undoped GaAs spacer layer is involved Mark
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03-01-2008, 01:55 PM
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I believe it is the 2 holes behind the power valve that let the extra gas through. Power Valve Channel Restricter. These sometimes need to be opened up if the jetting changes.
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03-02-2008, 06:11 PM
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T-bucket has your answer.
 The PVCR's provide the additional fuel needed when the engine is under heavy load. They work in parallel with the main jets to achieve the full power mixture. With todays fuel being a small percentage ethanol, a carburetor jetted for gasoline needs to be jetted up slightly. In many cases, especially an off road carburetor such as a Holley mechanical secondary, an increase in the PVCR's allows the main jet to be tuned for clean part throttle operation and all additional fuel supplied by the power valve circuit. There is a great deal of information available if you are interested fuel system tuning. Check some of it out!
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