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For reference#3 Plug
Bottom line is that unless there is something I don't see here your problem was detonation breaking the ring land followed by valve/piston collision due to piece of ring land holding open valve. IMHO
Another very good read. Had no idea that EGTs react that way to detonation! Cool stuff."Engines that are detonating will tend to overheat, because the boundary layer of gas gets interrupted against the cylinder head and heat gets transferred from the combustion chamber into the cylinder head and into the coolant. So it starts to overheat. The more it overheats, the hotter the engine, the hotter the end gas, the more it wants to detonate, the more it wants to overheat. It's a snowball effect. That's why an overheating engine wants to detonate and that's why engine detonation tends to cause overheating."Remember my cooling system issues I was discussing with ya a while back Fabr? I have a double edged sword going on, not to mention that I am helping the situation with poor cooling to begin with..Agreed.
For the bad ass engine, you planning on low compression or staying with something around 10.5:1? Reason I ask is that there are 2 schools of thought on this for turbo buggies compared to turbo bikes. What's your opinion?
I completely understand that theory as well, I just don't see the signs of it. No pitting on the piston, no aluminum on the plug ceramic. All cylinders, pistons, and plugs look wonderful...except for that chunk missing Hell, I dunno!I was leaning towards weak or broken spring cause it is the intake side that hit, and I never installed the heavier spring like has been highly suggested from other builders. High speed detonation..