well? i e-mailed a guy for a "shot peened, balanced, and micro polished" GSR crank

a guy is selling one but he keeps saying " great for turbo" but wont it bennifit a N/A car too, i mean im not running crazy compression or anything like that, just 11:1 after the ITR pistons, im just not sure whar shot pinged is, but i know its a process to help make it stronger. help me out

 

Shot peening is a process where they shoot metal bearings at the parts being treated so that any small surface cracks are removed. This will increase the fatique resistance of the parts meaning they can withstand more revs before starting new surface cracks. Surface cracks can eventually grow and lead to failure.
Meaning: yes n/a cars will benefit from shot peening. It will lenghten the life of the crank.
Sorry for being so technical. I can clarify if need be!

 

It helps, but is far from nessicary on a normal engine. Honda cranks really don't break very often, especially in N/A use.

 

Here is an explanation, but the cranks is still the strongest moving part of an engine. I would build up the rods/pistons/valvetrain before replacing a crank.





The surface of all metal parts contain some degree of micro-cracking, tiny cracks, discontinuties or even tool marks that can be a source of failure.

When a metal part is stressed and subjected to cyclic loading these micro-cracks enlarge and propogate through the part.

At some point in time the part will fail.

Normally, tensile stresses concentrates at the top or bottom of crack during loading.

However, the compressive skin created by peening tends to cancel out the tensile stresses and the cracks do not propogate.