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thats no good about the engine! from past experiance no3 or 4 spinning and the rest of the bearings ok tells me oil debis. as they are the first to get oil. and the first to get any contaminants aswell. where as if its no 1 or 6 then id look at oil starvation as a posible cause as they are the last to get oil.

unless a grub screw fell out or something..

interesting. All the other bearings do look ok. Piston on number four lightly tapped the head. Crank has a nice wobble now. I taked to James(Nisspeed) as he helped me build it. He seemed to think most likely detonation... but the oil pick was full of crap...can't tell if it was from my failed bearing or prior...

Things I am considering:

I was revving her to 9100rpm

I did hit the limiter quite a few times

Not likely oil starvation

Detonation was not high but hard to tell between real kncoks on my PFC and rpm limiter setting the knock sensors off.

Matt

Rods look like Howards? Very close to Argo.

Sorry to hear :(

Yep, Howards =)

I'll get it sorted. Had to come out to sort a couple of other issue's I wasn't happy with anyway. And how much is an Rb30 crank....$50. Just need to find some more NDC bearings...may favourite

Matt

if that was the only one rooted. its picked up some shit and scuffed the bearing. NOT DETONATION. i seen the exact same thing on my gf engine after a dodgy oil cooler install. no3 bigend and main destroyed. the rest were perfect... it happens. the problem is at those revs you cant hear it start to go till its ruined.

was the crank grubscrewed?

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