What is the difference between internally and externally balanced engines?

Internally balance engines have weights added to the crankshaft counterweights to achieve proper balance in the rotating assembly. The rotating assembly consists of the crankshaft, connecting rods, pistons, and wrist pins. To achieve proper balance in the rotating assembly, externally balanced engines require the use of added weight to the flywheel/flexplate, or weight removed from one side of the flywheel. Below is an excellent article from hotrod.com to further explain internal and external balancing and why it is important to select the correct flywheel/flexplate for your engine.

How to Balance An Engine – Engine-Balancing Basics

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