Editing Holley accelerator pump (section)
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===Pump cams=== [[File:Holley pump cam assort.jpg|thumb|right|4000px|Holley pump cam assortment]] The cams will have 2 (some 3) holes in them. Besides the change to the fuel delivery curve made by changing holes, position #1 is used when the throttle blades at idle are "normal", position #2 is when the tune of the car requires an idle speed of >1000 RPM or so. Position #2 makes up for the additional throttle shaft rotation that's required for the higher idle speed. Cams w/position #3 are usually used on REO 50cc pumps. <br style="clear:both"/> Generally, vehicles which normally run at lower idle speeds (600-800 RPM) find position #1 more useful because they can have a good pump shot available coming right off this relatively low idle. Positions #2 and #3 delay the pump action, relatively speaking. These two cam positions are good for engines that idle around 1000 RPM and above. Repositioning the cam in this way makes allowance for the extra throttle rotation required to maintain the relatively higher idle setting. ====Pump cam charts==== ;The following chart is from Jason Kolk, as posted at vintage-mustang.com: [[File:Holley pump Cams4777.jpg]] ;This is info supplied by Holley: [[File:Holley pump cam info.jpg|800px]] ;Cams from smallest to largest Holley says: "Accelerator pump shot relative to cam color from lightest to heaviest are as follows": [[File:Pump Cam Volume by Hole.jpg]] ====Dominator pump cams==== There are just two Dominator pump cams that come with the larger throttle shaft profile, as shown below. The other cams can presumably be modified to work on a Dominator. [[File:Dom pump cam.gif]] ====50cc pump cams==== The pump cams having three screw positions can be used on a 50cc pump, in position #3. Some are only for use with a 50cc pump.
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