Jim. Can it be that something else besides the prop is causing these vibrations?
ECI lists a few causes to the symptom. As it sounds there is more than just the prop out of balance. Engine Vibrates Excessively 1. Propeller out of balance or out of track 2. Bent crankshaft 3. Unequal valve clearance 4. Defective spark plugs 5. Engine loose on mount 6. Propeller hub nut loose 7. Carburetor icing 8. Incorrect carburetor setting 9. Engine too cold 10. Improper ignition timing Any of these will cause imbalance. But ignition and valves can cause quiet a lot vibration when not right. Is the engine performing good otherwise? Hartmut From: Jim Gall Sent: Monday, April 26, 2010 12:22 AM To: [email protected] Subject: Re: [ercoupe-tech] Prop nut torque Mike: thanks for the picture of the prop. That's the way I have the prop indexed now, but the way John Cooper lines up the engine and prop sounds pretty logical to me and I'm going to try it because I need help before my coop comes apart with vibration..
