I am not for or against them, curious what is your objection? As long as silicon is held low?? or is it just cast vrs forged?
Hyper's are the middle ground between conventional cast and forged pistons. They are a little
stronger than conventional cast pistons, but they're not nearly as strong as forged ones. Their slight increase in strength comes from manufacturing tricks to get the silicon content up to around 16% to 19% as opposed to around 12% for regular cast --- the increased silicon content is the definition
What is touted as the "advantage" of hyper's is that their dimensions don't change with temperature as much as those of forged pistons, so when running hyper's you can build to tighter clearances and avoid the noise ("piston slap") in a cold engine
that you sometimes get with forged pistons (because they require looser clearances). Once an engine with forged pistons warms up to operating temps, that problem goes away.
However, hyper's aren't as strong as forged and almost as important: they don't "bend" - they break.
So, when you run hyper's what you're doing is gaining a few minutes of slightly quieter operation while the engine is warming up and you're also saving on some cost, but you're also making a significant sacrifice in strength and toughness, and you're also taking a risk with what can happen in "unusual circumstanced". (Remember, cast and hyper's break, they don't "bend" like a forged piston can.)
I dunno about ya'll, but having an engine that is "quieter during warmup" isn't exactly high on my list of prioritiies..
However, strength, toughness, and longevity are VERY important to me so that's why I said..
"Personally, I'd never put hypereutectics in any engine I cared about."