HP and RPM Limit of Cast 2.8L Crankshaft

[datsun1973]

So does anyone have an opinion on the SHP and RPM limit of a 2.8L (2.992 in stroke) cast crankshaft (2.65 mains, 2.00 Rods) in a 3.4L DOHC application with 6.000" forged rods and a custom set of slugs.

I was looking at the billet crankshaft the guy has for sale over in the buy/sale forum but I figured the block would block long before I reached the limits of that crankshaft. I am hoping with a set of ARP main studs, rod bolts, head studs, knife edge the crank, chamfer all the oil holes and balence the snot out of the rotating assembly I should be able to push red-line to 9500.

For the purposes of this discussion lets assume I've solved the oiling issue (dry sump), valve float (solid lifters and STIFF springs), and intake/exhaust flow (custom cams, ITB's and equal length headers).

Thanks
Andy

[Superdave]

the cast crank.. maybe 8K, a forged steel one should be good for your goals though.

[datsun1973]

I totally agree. However, don't you think that would be overkill considering the 2 bolt mains of the block? Plus we're only talking about a 2.992 in stroke so the lever arm is reduced by ~.15" per throw which means much less stress on the crankshaft for a given power stroke. Also the MOI is lower. I guess I'll find out after it's built and see if it blows up at 9500!