Crankshaft question for the engine builders amonst us
 

When I recently stripped a EJ205 engine that had suffered from detonation on #4 piston I found the pictured crank along with steel rods (Eclipse), the crank has been x drilled through the mains and big ends but not nitrided,question is what is the crank from and what power is it up to?

v8 STi used a x-drilled crank, with nitriding being introduced from v9 from memory.........

cranks generally are not a power limiter

Thanks, so this crank with decent bearings, steel rods and Mahle 2618 forged pistons in a scdb will be reliable at 500-550bhp? Sorry to ask but I don't really want buy a version 9 crank if the one that I already have is well up to the job.

if the crank is in good condition then you will see far more issues in other areas than the crank itself...........

All new age 2.0 STI engines have cross drilled cranks, the JDM are nitrided as well. As Alyn said, the cranks will not be the weakest part of the engine at that level. Get it measured up, as a general rule you can run up to .001" undersize, as long as it's uniform wear and not oval. Use an 11mm oil pump, don't be fooled into thinking 12mm is better, they can jam the relief valve open, as they are meant for the quad avcs engines.

just for info we offer all engineering / machining services required as well as large stock of engine components, etc.........