Dayco PBO81117SC10 Engine Harmonic Balancer

Overview of Dayco SC Performance 8 Rib 10% Overdrive Harmonic Balancer

The Dayco SC Performance 8 Rib 10% Overdrive Engine Harmonic Balancer (Part Number PBO81117SC10) is engineered for select Cadillac, Chevrolet, and Pontiac vehicles. Designed to provide precise crankshaft vibration dampening, this harmonic balancer supports engine longevity and smooth operation in models such as the Caprice, Corvette, CTS, G8, and SS.

• Compatible with Cadillac, Chevrolet, and Pontiac Caprice, Corvette, CTS, G8, and SS models
• 9 bolt holes for secure mounting
• Neutral counterweight balance with no counterweight
• Crank bore diameter of 1.481 inches (37.60 mm)
• Two integrated serpentine pulleys with 4 and 8 grooves respectively
• Steel outer ring for durability
• Overall outside diameter of 8.229 inches (209.00 mm)
• Includes installation instructions; hardware not included
• Timing marks present for accurate engine timing

Details on the SC Performance 8 Rib 10% Overdrive Product Line

The SC Performance 8 Rib 10% Overdrive line by Dayco is designed to enhance engine accessory drive efficiency by increasing pulley diameter by 10%, which can improve accessory speed and performance. This harmonic balancer integrates two serpentine pulleys with 4 and 8 grooves, supporting multiple belt configurations. The steel outer ring construction ensures strength and resistance to wear, making it suitable for performance-oriented applications in compatible GM vehicles.

Technical Specifications and Features

This harmonic balancer features a neutral counterweight balance, meaning it does not add additional counterweight mass, which is ideal for engines requiring precise vibration control without altering crankshaft dynamics. The crank bore measures 1.481 inches (37.60 mm), fitting specific crankshaft sizes on select GM engines. The balancer includes two integrated serpentine pulleys: the first with 4 grooves and a diameter of 7.087 inches (180.00 mm), and the second with 8 grooves and a diameter of 8.099 inches (205.70 mm). The overall width is 3.101 inches (78.75 mm), and the nose outside diameter is 2.126 inches (54.00 mm). Timing marks are included to assist with accurate engine timing during installation.

Applications and Problem Solving

• Reduces crankshaft vibration to prevent premature engine wear
• Supports accessory drive systems with dual serpentine pulleys
• Improves accessory speed with 10% overdrive pulley design
• Maintains engine timing accuracy with integrated timing marks
• Compatible with performance and stock engine setups in Cadillac, Chevrolet, and Pontiac models

Installation Notes and Tips

Installation instructions are included with the harmonic balancer to guide proper mounting and alignment. Note that hardware is not included, so ensure you have the correct bolts and tools for your specific vehicle application. The 9 bolt hole configuration requires precise torque settings to secure the balancer properly. Verify crank bore size and pulley alignment during installation to maintain engine performance and accessory belt tension.

Quality Assurance and Warranty

Dayco manufactures this harmonic balancer with high-quality steel materials and precision engineering to meet OEM specifications. While specific warranty details are not provided here, Dayco products typically come with manufacturer-backed quality assurance. For warranty information, consult Dayco or your parts distributor.