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Old 08-08-2014, 12:16 AM
FrankGRUN FrankGRUN is offline
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After some research, I've found that the IMPCO 425 mixer will cause a pressure drop of between 0.6 and 1.4 inches of water over the maximum rpm range I anticipate using. The right angle adapters are much less of a problem. Calculations at 500 cfm and atmospheric pressure for a 4" diameter round duct into a 5.25 inch plenum show less than a 0.2 inch of water impact. I have a low pressure manometer and I intend to measure the full pressure differential from my cold air intake/ Spectre in line air cleaner approach to the plenum above the IMPCO mixer when I finish this thing. In the final configuration, I'll be using the IMPCO Commander feedback control to adjust the operating air/fuel ration with the LPG operation.
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