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This aneroid pin will give you a wider range of ramp rate to choose from then what the stock aneroid pin offers. It allows the fuel pin to extend deeper into the aneroid pin than the stock aneroid pin. I have had the machine shop test this design to ensure it is made to the same hardness scale as the stock aneroid pin. This aneroid pin will fit 12mm injection pumps. I have been running my design for 3 years in my 1993 HDJ81 with zero issues. The picture with the pin that has machine blue dye on the bottom is the aneroid pin I've been running for the last 3 years. You can see where the...
