Couple of engine tests

One of the things needed for the inspection is a fuel flow test and, looking through the inspection checklist I was given, a compression test.

The compression test is supposed to be what they call a differential test where you have two gauges and a bunch of other stuff to take the reading but all I had access to was a standard static compression tester so that will have to do. Oh, and by access to, I meant go out an buy from the local auto emporium.

Its a brand new engine, purrs like a kitten, we know the cylinders are good. Sure enough everything was in the 170s which is at the top end of ok per the Rotax maintenance manual.

For the fuel flow test, we disconnected the fuel line just before the engine fuel pump and timed how long it took for 3 gallons of fuel to flow from each tank and out the line into a fuel can. Some simple math will then give the gallons per hour that the electric fuel pump is putting out. Scott was on hose duty while I took care of the stopwatch.

Fuel flow test

Each tank came out at around 26 gph which is way above the FAA requirement of 125% of the engine max fuel flow which would be 10.25 gph.

From here I’m gathering the initial documentation to send to the inpsector.