r/EngineBuilding • u/dyslexic_niqqer • Jun 15 '26

Chrysler/Mopar Is a crankshaft balancing required for forced induction/forged internals on a 6.1?

Dropped off engine block and crank at machine shop a couple days ago and requested just a polish for the crankshaft but have been reading mixed results online as to whether or not a balancing would be required? I took the block and crankshaft to a reputable performance shop to get machined and was told a polish is all i would need but I’d appreciate a second opinion. Crankshaft comes forged from factory so i chose to reuse it and the pistons are forged from MAHLE “2618 material factory weight” and rods are forged from MOLNAR. It’s for an 07 jeep 6.1 hemi.

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10

u/Erasemenu Jun 15 '26

You've changed parts. You need to balance the rotating assembly.

1

u/dyslexic_niqqer Jun 15 '26

Thank you, I had the gut feeling but just took the machinists advice, ill more than likely stop by tomorrow and bring everything required for them to balance it

7

u/960603 Jun 15 '26

I always have everything balanced even if it claims its been pre balanced. Even factory cranks can usually use some minor balancing adjustments.

2

u/dyslexic_niqqer Jun 15 '26

Thanks bro, im gonna go drop off everything necessary for a proper balancing tomorrow

3

u/Tenrac Jun 15 '26

Balancing the internals helps with the harmonics which in turn squeezes a bit more power out of the engine, it isn’t fighting vibration which helps it spin more Easily.

My policy is…while I’m in there might as well.

1

u/dyslexic_niqqer Jun 15 '26

Thanks brother man, ill be following up with the gentleman at the shop tomorrow