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Shot Peened Std Rods V Forged Rods

The Bogan

By The Bogan,
in General Maintenance

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The Bogan Grand Master

The Bogan

Posted
Posted

One of my quotes for a engine rebuild has the std 25 rods being shot peened and another has forged items, Being a cheap arse i like the idea of the shot peening, but whats the difference, I watched a show on TV the other day and they were shot peening std rods for a Chevy motor.

Could someone please explain as one shop says they will be fine whilst another says they wont.

Thanks. MLR

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SteveL Mentor

SteveL

Posted
Posted

Stock Nissan rods are forged. I don't know of any Nissan engine that doesn't used forged rods, although some manufacturers have been experimenting with advanced powder met techniques.

Shot peening introduces a surface compressive residual stress which resists crack initiation and growth. If it's not done properly it can actually introduce defects.

In any event the weak point is not the rod, but the rod bolts, unless the rod has some manufacturing flaw (NDI is mandatory).

Whether you need to go to upgraded rods depends on expected power level as already suggested.

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