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Rod knock is quite different than "typical" valve train noise which might be better described as a "tic" or "tap". You say it goes away above idle, but if you increase the RPMs slowly does the rate follow the revs as it fades away? What does it sound like as the revs fall back towards idle, louder, quieter or the same?BTW, piston slap is only acceptable in a performance engine with forged pistons where additional clearance is provided because the expend more when hot. Once up to temp even they should be pretty quiet. So I would say that in a stock NSX engine it is more than an annoyance and likely telegraphs accelerated wear.
Rod knock is quite different than "typical" valve train noise which might be better described as a "tic" or "tap".
You say it goes away above idle, but if you increase the RPMs slowly does the rate follow the revs as it fades away? What does it sound like as the revs fall back towards idle, louder, quieter or the same?
BTW, piston slap is only acceptable in a performance engine with forged pistons where additional clearance is provided because the expend more when hot. Once up to temp even they should be pretty quiet. So I would say that in a stock NSX engine it is more than an annoyance and likely telegraphs accelerated wear.
