Quote:
Originally Posted by dwx
Time will show the pulley has nothing to do with it, just like it did for the other motors. The FA20 is the same basic design as every other boxer motor, the short crank and nature of the horizontally opposed engine results in a motor with little torsional vibration.
Guys who use EJ22s and EJ25s as aircraft engines often run the engines with nothing on the front of them...
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I think right now, we don't know that for sure. We can't assume either way, but I still stand by the belief that professional Subaru Engineers designed it to have a dampened pulley for a reason. Perhaps the OP could chime in and tell us how long the Perrin pulley was installed for? 10 miles? 5000 miles? 9000 miles? And did the engine ever go into the infamous "limp mode" with CEL? An engine running in the rough limp mode that is shuddering like a diesel can't be a good thing on harmonics...