cordiapower

could it be that gearbox was not properly installed, or as rb30 crank end was machined to have better grip for n1 oil pump drive that something was changed causing gearbox not to sit properly and making crank to be pushed against block hence causing crank central thrust bearing to snap...

no oil flow happened after 1500km and its due to snapped central bearing (one side of it snapped) in the middle of crankshaft, im wondering why did it happen after only 1500km and how could it snap in such a short time?

they were i assume because of no oil flow?

If it matters its got Extreme heavy duty 9 pack ceramic brass button 2500lb pressure plate clutch

I have a problem for rb30 experts: I put rebuilt rb30/25 in my r33. I found out just after 1500km that car was stalling whenever the clutch pedal is pressed and was loosing oil pressure and short after oil pressure lamp was turning on and after some checks oil pressure to the head was zero. The engine was pulled apart and we found out that central thrust bearing in the middle of crankshaft has grinded one sidewall and snapped that side off completely blocking oil flow...what could cause this? Bear in mind that car has all new parts weisco forged pistons, rb30 rods, race bearings and done only 1500km? thanks

size, offset

would they suit r33gtst

I checked the piston numbers and it seem that they are ones with 7:1 compression, they are nothing like those cubes used, they have much bigger channel on top hence lower compression, i redid compression test myself today and testing with full throttle it shown 120psi dead even on all but cylinder 3 and 5 which were bit lower around 115psi, and without throttle 115 on all but 3 and 5 which were 110psi, i dont know which method is more correct but as you can see cylinders 3 and 5 are lower on compression by 5psi, is it acceptable? and is there any resonable explanation why 3 and 5 are bit lower...?

I'll try to find out which part number pistons they used, anyway according to dyno graph car makes lots more power down low than standard engine at the same boost, like 20hp more at 2500rpm and 80hp more @3500rpm and 100hp more@4500rpm, with heaps more torque...what could be downside of lower compression pistons?

Hey everybody, just got rb25/30 combo dropped in my car, it has been freshly rebuilt with forged WISECO pistons, has heavily ported head and it made 414rwhp at 18psi with ITS 57 turbo which is equivalent to GT30 I think, now it made a lot of power, it uses standard head gasket but did compression test after maybe 1500km and it has compression ratios between 110-115psi, is that too low even for wiseco pistons? I was told it is built for 8:1 compression ratio but this compression results seem low? It has VCT setup as well. Anyone used WISECO pistons on here and what is compression on their engines?

is it rb25 head?

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whats needed to make this engine suitable for gts-t and how much $$$, also what injectors does it have?

condition?