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All knock is bad....but when you say the engine can ingest debris as well....harder to say for sure what the marks would be.
Usually it's assumed the engine draws clean air, so whilst it could well be detonation...it could also be from dirt, although you'd think sand would likely cause more harm to rings and bores than the top of the piston
I was thinking the same thing. Looks like something could have gotten in there and bounded around but I don't think sand would cause divits like that, and I'm not really sure what knock/ping looks like.
If it is knock, is that amount concerning. Obviously any is not good but should I start changing things.
I was thinking the same thing. Looks like something could have gotten in there and bounded around but I don't think sand would cause divits like that, and I'm not really sure what knock/ping looks like.
If it is knock, is that amount concerning. Obviously any is not good but should I start changing things.
Again, any knock is concerning, there should be none, ever.
What do the ring faces look like ?
If it is determined to be detonation, then yes you need to look at either the tuning, fuel etc in order that there is no detonation in the future.
That may be as simple as a little more fuel, 1 deg less timing, 1psi less boost, better charge cooling etc etc.
I would disagree, alot motors knock frequently at high loads. Especially large bore, decent compression, boosted motors. All that matters is knock intensity, a couple bar won't hurt and can still show up on pistons, 20+ bar gets pretty sketchy. But overall yeah, if you're looking for some more life out of the motor down one variable down slightly
Hook up the computer and get some data.
What computer?
Looks more like it ingested something, maybe a little rock. Run it. But get some data from that thing, that's what computers are for.
I would disagree, alot motors knock frequently at high loads. Especially large bore, decent compression, boosted motors. All that matters is knock intensity, a couple bar won't hurt and can still show up on pistons, 20+ bar gets pretty sketchy. But overall yeah, if you're looking for some more life out of the motor down one variable down slightly
Just because some are happy to take risks with detonation, still doesnt make it right they should run that way
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Is this detonation? 
