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Vital to engine durability, a harmonic balancer dampens harmful engine vibrations that increase wear rates of internal engine parts. Known by many names (harmonic damper, engine dampener, crankshaft balancer), the harmonic balancer is mounted to the snout of the crankshaft using either a press-fit or a retaining bolt. Before choosing a harmonic balancer, there are a few different types you should familiarize yourself with.

 

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Chevy Small Block V8, 6.75" Outside Diameter, Steel

Outside Diameter: 6.75"

Inside Diameter: 1.20"

Overall Thickness: 2.31"

Thickness: 1.1875"

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6.25" Outside Diameter, 18.1 SFI Rating

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Outside Diameter: 6.25"

SFI Rating: 18.1

Engine Balance: Internal

Degree Markings: Yes

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383, 395, 400, 6.75" Outside Diameter, 7.75 lbs. Weight

Outside Diameter: 6.75"

Inside Diameter: 1.25"

Overall Thickness: 2.20"

SFI Rating: Not SFI-approved

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350, 6.25" Outside Diameter, 2.4375" Overall Thickness

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Outside Diameter: 6.25"

Overall Thickness: 2.4375"

Thickness: 1.25"

SFI Rating: 18.1

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265, 267, 283, 302, 305, 307, 327, 350, 262, Steel

Outside Diameter: 6.00"

Inside Diameter: 1.25"

Overall Length: 2.35"

SFI Rating: Not SFI-approved

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262, 265, 267, 283, 302, 305, 307, 327, 350, Steel

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Outside Diameter: 6.25"

Overall Length: 2.335"

SFI Rating: 18.1

Weight: 7.90 lbs.

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400, 8" Outside Diameter, Not SFI-approved SFI Rating

Outside Diameter: 8"

SFI Rating: Not SFI-approved

Weight: 12.59 lbs.

Material Type: Steel

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283, 302, 305, 307, 327, 350, 6.1" Outside Diameter

Outside Diameter: 6.1"

Inside Diameter: 1.246"

SFI Rating: Not SFI-approved

Weight: 4.6 lbs.

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260, 289, 302, 351W, 5.0L, 6.40" Outside Diameter

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Outside Diameter: 6.40"

Overall Length: 3.00"

Engine Balance: External

Degree Markings: Yes

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Chevy Small Block V8, 6.325" Outside Diameter, Steel

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On Sale

Outside Diameter: 6.325"

SFI Rating: 18.1

Weight: 9 lbs.

Material Type: Steel

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429, 460, 6.7" Outside Diameter, 1.37" Inside Diameter

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Outside Diameter: 6.7"

Inside Diameter: 1.37"

Thickness: 1.42"

SFI Rating: 18.1

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289, 302, 327, 347, 351C, 351M, 351W, 18.1 SFI Rating

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Outside Diameter: 6.4"

SFI Rating: 18.1

Engine Balance: External

Degree Markings: Yes

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302, 351W, 5.0L, 4.101" Overall Width, 9.69 lbs. Weight

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Overall Width: 4.101"

Weight: 9.69 lbs.

Material Type: Steel

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283, 302, 305, 307, 327, 350, 6.1" Outside Diameter

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Outside Diameter: 6.1"

Thickness: 1.52"

SFI Rating: 18.1

Weight: 5.4 lbs.

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305, Aluminum, Hardware Included, Degree Markings

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Material Type: Aluminum

Hardware Included: Yes

Degree Markings: Yes

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400, 8" Outside Diameter, Not SFI-approved SFI Rating

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Outside Diameter: 8"

SFI Rating: Not SFI-approved

Weight: 11.4 lbs.

Engine Balance: Internal/External

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454, 8" Outside Diameter, Not SFI-approved SFI Rating

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Outside Diameter: 8"

SFI Rating: Not SFI-approved

Weight: 11.4 lbs.

Engine Balance: Internal/External

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Chevy Small Block V8, 6.00" Outside Diameter, Steel

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Outside Diameter: 6.00"

SFI Rating: 18.1

Weight: 5.70 lbs.

Material Type: Steel

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260, 289, 302, 351W, 5.0L, .35" Thickness, Aluminum

Thickness: .35"

Material Type: Aluminum

Finish: Natural

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289, 302, 351W, 6.375" Outside Diameter

Outside Diameter: 6.375"

SFI Rating: Not SFI-approved

Engine Balance: External

Degree Markings: Yes

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260, 289, 302, 351W, 5.0L, .95" Overall Thickness

Overall Thickness: .95"

Material Type: Aluminum

Finish: Natural

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5.63" Outside Diameter, 18.1 SFI Rating, Steel, Chrome

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Outside Diameter: 5.63"

SFI Rating: 18.1

Material Type: Steel

Finish: Chrome

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283, 302, 305, 307, 327, 350, 6.62" Outside Diameter

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Outside Diameter: 6.62"

SFI Rating: 18.1

Weight: 10.15 lbs.

Engine Balance: Internal

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260, 289, 302, 351W, 5.0L, .875" Overall Thickness

Overall Thickness: .875"

Material Type: Aluminum

Finish: Natural

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$323.95
$343.75

262, 265, 267, 283, 302, 305, 307, 327, 350, Steel

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On Sale

Outside Diameter: 6.29"

SFI Rating: 18.1

Material Type: Steel

Finish: Black powdercoated

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$349.99
$449.00

572, 6.325" Outside Diameter, 18.1 SFI Rating

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On Sale

Outside Diameter: 6.325"

SFI Rating: 18.1

Weight: 2.2 lbs.

Engine Balance: Internal

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396, 402, 427, 7.17" Outside Diameter, 18.1 SFI Rating

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Outside Diameter: 7.17"

SFI Rating: 18.1

Material Type: Steel

Finish: Black powdercoated

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Chevy LS V8, 7.25" Outside Diameter, Nodular Iron

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Outside Diameter: 7.25"

Material Type: Nodular Iron

Finish: Painted

Engine Balance: Internal

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Although they're simple in appearance, there's a lot of engineering packed into these devices. The Elastomer balancer makes use of a rubber-isolated steel ring to dampen crankshaft vibrations. The rubber lining converts harmonic waves into heat. This style is common on stock engines because it is cheaper to manufacture and performs well under known conditions. As various engine parts are altered and/or RPM increases, however, the harmonics in the engine can shift outside of the range this type of damper is designed for.

 

Fluid dampers use a flywheel suspended within a specialized fluid to dissipate harmful vibrations. Due to its greater ability to manage heat (remember: a damper converts vibration energy into heat), a fluid balancer is more effective across a wider operating range. Plus, all moving parts are fully self-contained, allowing it to meet SFI 18.1 safety ratings for extreme racing conditions. TCI's Rattler line is constructed in a similar way, except without the fluid. The Rattler is unique in its ability to absorb energy, rather than convert it to heat.

Generally, a longer stroke or greater torque requires a larger diameter harmonic balancer. Also, keep in mind that some engines are externally balanced and require a balancer with provisions for bolt-on weights. Finally, when replacing a harmonic balancer, don't forget these install/removal tools to ensure you don't damage the balancer or crankshaft.

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