will a too of light weight crank cause a torque curve to drop rapidly towards high rpm and produce a low peak torque? any info will really appreciate it

 

If the stroke isn't changed, then no, the crank will not affect torque output. It will just allow the engine speed to change more easily.

 

thanks on the info, one domestic guy i work with was debating on this, claims torque curve will rapidly fall with a too light of a crank

 

No, a light rotating assy will make the engine rev more like a crotch rocket. It also "frees" more power that would otherwise go towards spinning the heavier components. Granted, more "load" is placed directly onto the engine instead of a heavy flywheel, etc, which may be interpreted as a low torque output. I've heard that too light of a rotating assy can cause some drivability issues(more gas to get up a hill than before, more gas to get the car started from a stop, etc.). Inertia is fun ****(not really).

 

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There's a difference between torque and momentum and inertia