CopterJohn
Active Member
I am 36 hours into my 40 hour test period on my 0-360 with airflow performace injection package. Setup mixture initially last fall for 30 rpm increase at cutoff per Lycoming SB. Ran perfectly until a few days ago.
Now that it is hot out, the engine is barking and coughing at idle after a test flight and tries to keep running when the mixture is pulled.
We reset the mixture again today on a warm engine and it idled smoothly with the proper increase at fuel cutoff. Cowled it up, went flying, and came back to have the engine quit in the flare when the throttle was retarded to 890 rpm. Withe the Whirlwind, the prop stops dead.
Had to use the flooded start technique to get it going and taxi in. Quit again at the hangar when the throttle is pulled back with mixture in.
What now? Is this a heat or vapor lock issue we are chasing?
Now that it is hot out, the engine is barking and coughing at idle after a test flight and tries to keep running when the mixture is pulled.
We reset the mixture again today on a warm engine and it idled smoothly with the proper increase at fuel cutoff. Cowled it up, went flying, and came back to have the engine quit in the flare when the throttle was retarded to 890 rpm. Withe the Whirlwind, the prop stops dead.
Had to use the flooded start technique to get it going and taxi in. Quit again at the hangar when the throttle is pulled back with mixture in.
What now? Is this a heat or vapor lock issue we are chasing?