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What's causing a constant roughness in my engine?

from General Aviation News

According to author Paul McBride: Aging aircraft are notorious for having cockpit instrumentation that can be inaccurate. So, my question to you is have you had your tachometer calibrated recently? We may have a condition here where the tach is reading a couple hundred rpm low which, in turn, means the engine is drawing more horsepower and not getting the proper amount of fuel to support that extra power. If your carburetor has a flow setting to support 250 hp at 2,575 rpm and your engine is actually turning 2,650 or 2,700, which is not indicated on your tach, the engine is not getting the proper amount of fuel to support the horsepower being taken out of the engine. more


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