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Message: <blockquote data-quote="shiroitenshi" data-source="post: 3144929" data-attributes="member: 27518">The hot spots are always near the valve pockets because even on the stock engine, the hot spots are there as well. I think there's a picture I posted a while back of my engine with detonation signs on pistons, and as can be seen, it's localized to the valve pocket area mostly.. then again, most other engine too. I don't think it's cureable, because of the distance between the two exhaust valves, and that thin slice of aluminium seperating them.If it's melted, usually in won't break off at one edge.. it's near impossible for detonation damage to be localised to one place.Valve hit is possible, because if the valve 'floats', it's usually individual, and it's not that the valvespring is not working, it's more of because the valve didn't return to the seat fast enough. Then again, I'm apt to think it hit the head, because the one I saw with the same breakage had this tiny little ring at the top of the piston that when measured, the diameter is the same with the hole in the head that was opened up. It did appear to have melted edges, because the chamber width was wide enough to 'fold' the sides to make it look like it melted.I'm just giving my insight though. If you think it's detonation, then I think you already decided on possible ways of curing that problem. I'm really not thinking much about detonation beign a prime cause for engine damage anymore, because seems like most people aren't running stupid high 6-8cc domes on the B20B anymore, so it's unlikely that detonation continue to be a major cause of engine blowing. most are in the region of low 12 or less. You can even see from the pistons that are brought in by tuner shops in Malaysia for B20B builds to be of average compression for street use, compared to the old days of bigger dome = better.Frankly, I don't think NA engines output enough pressure to easily break any FORGED parts. Even the stock cast pistons can withstand knock somewhat. (usually the heat kills them first, aka piston seized) or the crank bearings get loose (due to knocking). It's like the old days of overreving B16as for power.. most damage will be blamed on overreving, which is true, but even damage unrelated to overrevving gets blamed on overrevving.</blockquote>

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