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Does Lycoming make any sense?
The pressure drop across the nozzle orifice is the absolute pressure into
the nozzle less the absolute pressure in the manifold. I don't have a system diagram here, but I believe the factory fuel flow gauge is a differential pressure gauge referenced to manifold pressure. "Capt.Doug" wrote in message ... "Stan Prevost" wrote in message I don't think so, at least not very much decrease. I think the fuel will divide among the functioning injector nozzles. This is why the pressure increases when one is blocked, the fuel is forced through a fewer number of orifices, causing a greater pressure drop across them. If we are talking about the OEM 'flowmeter', how many transducers does it have? It would need two to measure a pressure drop. It needs only one to measure the pressure near the spider. If it has only one transducer near the spider, and a nozzle clogs, the remaining nozzles won't flow enough to relieve the increased pressure and the result will be an increased 'flow' indication. But I believe they flow all the metered fuel (or nearly all of it) as long as the fuel pump provides sufficient pressure. Do you think the fuel flow out of the fuel injector body (fuel servo) decreases if one nozzle clogs? Once there is enough restriction to flow so that the "back pressure" from the spider approaches the fuel pump pressure, then flow will reduce, but until then, I think the servo maintains the flow it wants. |
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