Agreed, we all have our opinions - and diverse opinions can only help some in asking more questions, doing more research, or making better informed choices. You would not run with the hyper's whereas I would and I would not run a roller cam without the lifter brace whereas you would.
The post you linked to was put up in 2005. It is now 13 years later. Improvements, or even better awareness, of setting up these pistons can only have evolved since 2005.
From what I gathered, since these pistons are a casting, many were setting ring tolerances according to what they were familiar with and would have used for the factory or replacement cast piston - not the hypereutectic pistons. They are of a different composition just as forged pistons can be made of different materials & mixtures of alloys and ring placement was made higher putting them into more heat.
In my opinion, they have features that are better than cast WHEN used in a stock or mild performance engine not using nitrous or supercharging.
Hypereutectic pistons are simply a stronger type of alloy with a higher silicon content. Silicon doesn't expand so you can run tighter clearances with these pistons than with others, which helps seal-in the combustion pressure, plus the alloy used in these types of pistons is better than what other cast pistons have so they are stronger than any typical cast piston
, but they are still cast pistons, which have limitations to what kinds of stresses and such they can be put through.
KB Pistons can be installed tighter than other performance pistons. A close fitting piston rocks less, supports the rings better, and seals the engine for maximum power.
The Keith Black pistons unique thermal conductivity, ring location and varied end use requires special attention be paid to top ring end gap. KB pistons make more HP by reflecting heat energy back into the combustion process and, as a result, the top ring runs hotter and requires additional end clearance
. Increasing ring end gap does not affect performance or oil control because normal end gaps are realized at operating temperatures.
Failure to provide sufficient top ring end gap will cause a portion of the top ring land to break as the ring ends butt and lock tight in the cylinder. The broken piece may cause further piston or engine damage.
Hypereutectic piston engines will require 2-4 degrees less total ignition timing. One key to top performance is to have all cylinders igniting and producing a like flame travel that produces the same timing numbers. Equal air flow, fuel mix, quench, chamber temperature, swirl, and compression at each cylinder work to this end.
HYper's had some set-backs when they first hit the market and from what I have read all over the net is it came from improper ring gaps and taking into account that they were said to be stronger than cast and guys running power adders which further aggravated the ring gap problem - suffice to say that the pistons were not the true problem
, but the expansion found in the rings at the higher temps due to the higher location of the top ring land which required wider ring gaps. Once the hyper's, like any engine product, gets tarnished or is given a bad review, the stigma of a bad product seems to hang over them like a cloud even though it is a good product when used as intended and manufacturer specs are adhered to. Finding blogs, threads, & forums that are current and not 15 years old seem to put hypereutectic pistons in a more favorable light.