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Back sides of bearings are black. No other signs of damage. THere are no grooves in the bearings. NO damage to the journals of the crank. I don't think its to long between changes as no damage was done to the crank and the bearings were a long long way from destruction. I am interested in what black back sides of bearings means.
I am interested in detonation. No damage to rings or ring lands or piston. It could be first signs though, as my compression ratio is 12:1 and I am only running 105 Plus octane gas. Thats a mix of 110 octane race gas with 91 octane unleaded, ie 50/50. I could easily go to straight 110 octane to see if it makes a difference. Up to 120 octane is available, if necessary.
Since I am going to a 330 degree cam I may see more of this next time. We will see. I am looking at what 200 HP? Currently am seeing an actual 140hp at ther rear wheels, continuous, thats what? Between 160 and 185hp at the crank. Note the generator is running and the cooling fan has all the blades (but a "power" pully).
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