[hotrod]

Thanks, that backs up my circumstantial evidence and theory that that damage was from the "dirt experiment".

Really T'd me off at the time, I forgot there was a segment of dirt and gravel at the end of the strip where you turn off to pick up your timing slip. Lots of folks cut the corner short and thow dirt and sand up on the paved portion of the turn out. I took the turn out at about 30 mph and was in the crud before I realized it. My air intake sits right behind the front air dam and I figured the air dam passing close over the surface of the sandy pavement suspended a lot of crap in the air.

Like you said it only takes a single event. After that first pass, I took the turn off road very wide and slow and saw no more evidence of sucking dirt.

Interesting side note is that the damage is confined to the extreme outer blade tips, probably a combination of the swirl that develops ahead of the compressor inlet centrifuging the dust to the outside of the tube and the higher relative velocity of the blade tips vs the portion of the blades closer to the hub.

There is one guy that posts on another form that says he's run a pre-compressor injection for years with no sign of compressor damage.

Larry