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Holley carburetor main jet sizing question
I'm curious about an apparent inconsistency in the size stamped onto the Holley main jets that came out of a Holley two-barrel 6280 feedback carb designed for the Chrysler 3.9L engine that went into the 1987 Dakota V6. The jet is stamped "175", but the hole appears slightly less than 1 mm in diameter so the 175 cannot be in reference to the hole size, which would normally indicate a 1.75 mm opening. Could this be in reference to flow rate that was used by the 124-XXX series of Holley main jets? I couldn't find anything that referred to a Holley 124-175 main jet anywhere on the web and Holley wants an incredible amount of info before they will accept an email inquiry. The following site has a table of equivalence between the 124-XXX jets that are flow rated and the older 22R-103-XXX that are size rated. http://www.mazdatruckin.com/B2200/5200.html The chart is a little past halfway down and is titled: "Main Jet Conversions". A quote from the article reads, "Note that not all available jets may be listed as they might not flow an equivalent volume between old and new jets." A flow rate of 175 cc per minute seems low but these main jets were augmented by the jet that was controlled by the mixture control solenoid, so maybe the 175 *does* refer to flow rate. Anyone know for sure? Holley website was no help. The Holley Tech Service Request Form was like a final exam and I guess was put up to deter people like me looking for info on arcane, abandoned technology. Jack |
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