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Originally Posted by kiloalpha

Out company for years and years have told us to run at 2300 rpms and 23" on the MP. Usually trues us out at 170-172kts and burns about 30-32 gph.

Now we are being told to run at 2200 rpms and 24" of MP. We are told this has no negative effect on the engine as is better for the props since they work more efficiently now. Is this true? Are we going pop cylinders and crack cases now? or is this actually going to work?

We have Lycoming IO-540s that make 290hp. Company research shows a fuel savings of 10% with a 1-2% drop in airspeed.

MP is just a measure of the level of vacuum in the intake manifold. the higher the number, the lower the vacuum, meaning the engine is not working as hard to get air. unless we are talking about turbo, the engine will only suck as much air as it can use.