Oil pan baffle plate

[Ultramaroon]

Unless this engine has any odd history, I'm kind of in Soundman's camp. Makes me want to pull mine apart to inspect. Mine sees redline practically every time I'm out and the occasional high-rpm cruise just to stay comfortable with operating smoothly up top.

[FreshBRZ]

I almost never push my car hard and most of the time under 4k rpm. Someone from a facebook group had the same problem and broke in the exact same spot. Maybe the metal is too thin and fragile.

[Ultramaroon]

Yet another reason why an oil pressure gauge is critical. The shape of the stamped ribs is wrong. Leaves a stiff mass supported by that weak ear where it first started cracking. This is a design flaw that should've been caught with a modal analysis.

[soundman98]

Originally Posted by FreshBRZ

I almost never push my car hard and most of the time under 4k rpm. Someone from a facebook group had the same problem and broke in the exact same spot. Maybe the metal is too thin and fragile.

that makes me even more concerned... this is my fun car. if i'm not bouncing off redline, it's not always fun.

[Ultramaroon]

Originally Posted by soundman98

that makes me even more concerned... this is my fun car. if i'm not bouncing off redline, it's not always fun.

It depends on the lowest resonant frequency of that particular shape in that specific environment. If we knew all the dimensions, we could model it and come up with a decent approximation. I would take a good one and capture the sound of tapping around it with a piece of wood. Spectrum analysis would give us the fundamental frequency. It should match the digital model very closely, within a few Hertz.