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8,804 Posts
well, caning my engine to 9000rpm may not have been such a great idea. Car doesn't really have increased knock under power, but when spinning freely, I'm hearing this whispering flutter at 3000~5000rpm. Last time I heard this sound, I spun a bearing 9 months later.
Is this a sound others have heard (or am I just paranoid)? Could this be the first symptom of unhappy bearings? If I pulled my engine and replaced the shells with EXACTLY the same ones I put in before, would it be sorted? Or do big ends and crankshaft pins change?
In general, no real increase in peak knock, but the knock graph looks noisier under light to no load, which indicates that the knock sensors are listening to mechanical noise at those times.
My oil system is killer though - I'm at 8.5 bars of pressure when I'm hard on the gas. Tomei pump + extended sump + Accusump. Is it really possible to spin a bearing when the oil supply is more than sufficient??
If I spin a bearing though, might as well do a 2.8 stroker. Am I right in that all I would need are new bearings, a stroker crankshaft, and properly sized conrods, and I can reuse the HKS pistons (sized for stock engine stroke, 87mm bore)?
Is this a sound others have heard (or am I just paranoid)? Could this be the first symptom of unhappy bearings? If I pulled my engine and replaced the shells with EXACTLY the same ones I put in before, would it be sorted? Or do big ends and crankshaft pins change?
In general, no real increase in peak knock, but the knock graph looks noisier under light to no load, which indicates that the knock sensors are listening to mechanical noise at those times.
My oil system is killer though - I'm at 8.5 bars of pressure when I'm hard on the gas. Tomei pump + extended sump + Accusump. Is it really possible to spin a bearing when the oil supply is more than sufficient??
If I spin a bearing though, might as well do a 2.8 stroker. Am I right in that all I would need are new bearings, a stroker crankshaft, and properly sized conrods, and I can reuse the HKS pistons (sized for stock engine stroke, 87mm bore)?