{"product_id":"dayco-pbu1190ss25-engine-harmonic-balancer","title":"Dayco PBU1190SS25 Engine Harmonic Balancer","description":"\u003ch2\u003eOverview of Dayco Race Performance 25% Underdrive Harmonic Balancer\u003c\/h2\u003e\u003cp\u003eThe Dayco Race Performance 25% Underdrive Engine Harmonic Balancer (Part Number PBU1190SS25) is engineered for select GM and related vehicles requiring precise crankshaft vibration control. Designed to reduce parasitic drag by 25%, this harmonic balancer supports improved engine efficiency and performance in applications such as the Chevrolet Silverado and GMC Sierra series.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUnderdrive ratio reduces accessory speed by 25%\u003c\/li\u003e\n\u003cli\u003eNeutral counterweight balance for consistent crankshaft damping\u003c\/li\u003e\n\u003cli\u003eSteel outer ring for durability and longevity\u003c\/li\u003e\n\u003cli\u003eTwo integrated serpentine pulleys with 4 and 6 grooves\u003c\/li\u003e\n\u003cli\u003eIncludes installation instructions for proper fitment\u003c\/li\u003e\n\u003cli\u003eCompatible with multiple GM and related models including Chevrolet, GMC, Cadillac, and Hummer\u003c\/li\u003e\n\u003cli\u003eTiming marks included for accurate engine timing setup\u003c\/li\u003e\n\u003cli\u003eThree bolt hole design with 1.481 inch (37.60 mm) crank bore diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description and Specifications\u003c\/h2\u003e\u003cp\u003eThis Dayco harmonic balancer features a 6.221 inch (158.00 mm) overall outside diameter and a width of 4.528 inches (115.00 mm), optimized for durability and fitment in heavy-duty and performance engines. The balancer’s steel outer ring enhances resistance to wear and heat, while the neutral counterweight balance ensures no additional imbalance is introduced to the crankshaft. It includes two integrated serpentine pulleys, one with 4 grooves and the other with 6 grooves, both measuring 5.630 inches (143.00 mm) in diameter, designed to drive accessories efficiently at a reduced speed. The balancer does not include a crank trigger or exciter plate, and hardware is not included, but installation instructions are provided to assist with proper mounting.\u003c\/p\u003e\u003ch2\u003eRace Performance 25% Underdrive Product Line\u003c\/h2\u003e\u003cp\u003eThe Race Performance 25% Underdrive line by Dayco is tailored for applications requiring reduced accessory speeds to lower parasitic losses and improve engine output. This underdrive harmonic balancer is part of that line, offering a 25% reduction in pulley speed compared to stock components. It is suitable for performance and heavy-duty vehicles where accessory drive reduction can contribute to enhanced throttle response and power delivery.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eChevrolet Silverado 1500, 2500, 3500 (including Classic and HD variants)\u003c\/li\u003e\n\u003cli\u003eGMC Sierra 1500, 2500, 3500 (including Classic and HD variants)\u003c\/li\u003e\n\u003cli\u003eCadillac Escalade, Escalade ESV, Escalade EXT\u003c\/li\u003e\n\u003cli\u003eHummer H2, H3, H3T\u003c\/li\u003e\n\u003cli\u003eBuick Rainier\u003c\/li\u003e\n\u003cli\u003eIsuzu Ascender\u003c\/li\u003e\n\u003cli\u003eSaab 9-7x\u003c\/li\u003e\n\u003cli\u003eOther GM trucks and SUVs such as Avalanche, Suburban, Tahoe, Envoy, Canyon, Colorado, Trailblazer, and SSR\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Issues Addressed by This Harmonic Balancer\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCrankshaft vibration and harmonic dampening to prevent engine damage\u003c\/li\u003e\n\u003cli\u003eReduction of accessory drive speed to improve engine efficiency\u003c\/li\u003e\n\u003cli\u003eReplacement of worn or damaged stock harmonic balancers\u003c\/li\u003e\n\u003cli\u003eImproved throttle response through underdrive pulley design\u003c\/li\u003e\n\u003cli\u003eMaintaining accurate engine timing with included timing marks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eInstallation instructions are included to ensure correct mounting and alignment\u003c\/li\u003e\n\u003cli\u003eHardware is not included; use existing or appropriate fasteners\u003c\/li\u003e\n\u003cli\u003eVerify crank bore diameter (1.481 inches \/ 37.60 mm) and bolt hole count (3) for compatibility\u003c\/li\u003e\n\u003cli\u003eEnsure timing marks are aligned properly during installation for accurate ignition timing\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended for precise fitment and safety\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDayco manufactures this harmonic balancer with high-quality steel materials and precision engineering to meet OEM standards. The Race Performance 25% Underdrive harmonic balancer is designed for durability and consistent performance under demanding conditions. Installation instructions are provided to support proper use. Warranty details should be confirmed with the distributor or manufacturer, as they may vary by region and application.\u003c\/p\u003e","brand":"Dayco","offers":[{"title":"Default Title","offer_id":43391731663029,"sku":"BJTQ-PBU1190SS25","price":337.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DY_PBU1190SS25_Fro.jpg?v=1774729426","url":"https:\/\/www.partcatalog.com\/products\/dayco-pbu1190ss25-engine-harmonic-balancer","provider":"PartCatalog","version":"1.0","type":"link"}