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Adding a performance harmonic balancer is a great way to improve engine balance and reduce vibration. JEGS offers a wide selection of high-performance harmonic balancers for sale fitting many Ford, GM (Chevy), Mopar, and custom engine applications from top manufacturers like ATI harmonic balancer, Fluidampr harmonic balancer, JEGS harmonic balancer, and others. Each harmonic balancer is made from high quality components and assembly so you can get the performance you want at a price you can afford with the assurance you need.
There are benefits to upgrading engines with high performance harmonic balancers. When properly matched, the result will be increased balance and reduced vibration for your engine. JEGS offers harmonic balancers online and with over 60 years in the business, JEGS is the high performance engine parts superstore.
It can sometimes be overwhelming and confusing when buying a racing harmonic balancer. There are many factors to consider such as brand, price, warranty, diameter, material (steel, iron, aluminum), and much more. Because a harmonic balancer upgrade can be a significant investment, it is important to do your research and get all your questions answered prior to making a final purchase. If you are trying to learn more about harmonic balancers, we can help you along the way. Here are some answers to frequently asked questions about harmonic dampers and kits:
A harmonic damper (or "harmonic balancer", if it incorporates a counterweight to externally balance the rotating assembly) is a circular disc-shaped component that fits on the front of engines with long crankshafts (for example straight-6 and straight-8 engines), many V8 engines, as well as V6 engines with an uneven firing order. The harmonic balancer's purpose is to absorb and reduce vibration and resonance caused by the crankshaft spinning. On later model engines, the balancer can include grooves with a built-in pulley to drive accessories such as the water pump or alternator.
There are a couple ways to determine if a harmonic balancer / damper needs replaced. The first is with a visual inspection. If there are loose or damaged parts on it, replacement is necessary. Often dampers have rubber components to help absorb vibration and the rubber can rot or become brittle, requiring replacement. If the engine is vibrating when previously it was running smoothly without anything changed to it, the harmonic balancer is on the list of possible components that need to be replaced.
In order to take off the harmonic balancer, first remove any components that are in the way of removal, such as belts, pulleys, brackets, and any front engine accessories. Next, a harmonic balancer puller set is used to extract the balancer from the crankshaft snout. This tool bolts to the threaded holes in the balancer that the crankshaft pulley is normally attached to. In the middle of the tool is a long bolt that is threaded to the center of the end of the crankshaft. When the center bolt is tightened, it slowly pushes on the end of the crankshaft, while the balancer is slowly pulled away from the crank. Once the bolt is tightened enough, the balancer will be freed from the end of the crankshaft and can be removed. Most crankshafts have a key that fits into a groove on the side of the crank snout to help hold the balancer in place and keep it from spinning separately. Remove the key and inspect it for damage. Next, the crankshaft end is inspected and cleaned in preparation for the installation of the replacement balancer. If there is damage, a repair sleeve may be required. If the front timing cover seal is leaking or needs to be replaced, it should be done at this time. Once the crankshaft snout is prepped for installation, an installer tool is used. The crankshaft key is reinstalled and the balancer is properly lined up on the crank. The install tool slowly presses the harmonic damper onto the crankshaft by turning a bolt. Once the damper is installed, the rest of the engine components that were removed can be bolted back into place. After double-checking that everything is installed correctly, the engine can be started and checked to make sure there is no vibration and that everything is working properly.
Over time, the effects can lead to cracks and/or a failure. So, with that, as the name implies, a properly designed harmonic balancer will absorb harmonics and vibration and keep your bottom end alive.
There are three major types of balancers: elastomer, fluid, and friction. The elastomer type uses a rubber material, which controls much of the vibration. Viscous or fluid type uses fluid to absorb the flexing energy. Lastly, friction-style dampers rely on internal clutch discs to quell harmonics.
Pro/Race markets three different streams of product: Pro/Street, Pro/Sport, and Pro/Racer. For the high end of engine performance, our Pro/Racer harmonic balancers feature machined drive hub with a fine spline on the outer radius to couple to the inner surface of the elastomer dampening ring using a chemical bonding agent. The steel inertia ring is also machined with the fine spline to couple with the outer surface of the elastomer dampening ring, also using a chemical bonding agent. The effect of the spline is to nearly double the surface-area contact between the elastomer dampening ring and the hub and ring, thus eliminating any permanent rotational movement between the hub and the ring.
If you take a look at the harmonic balancer, you might be able to see visible wear or damage. For example, the rubber insulator may have deteriorated, resulting in a separation between the hub and outer portion of the balancer.
The harmonic balancer moderates the high-frequency vibrations acting on the crankshaft. A typical balancer has a center hub, an inertia ring, and a rubber insulator (some designs use viscous fluid rather than rubber). The center hub is bolted to the end of the crankshaft. As the crankshaft twists and turns, the inertia ring and rubber ring absorb some of the resulting vibrations.
Although the harmonic balancer may seem simple enough, if it fails, it can cause major problems. Without the balancer dampening unwanted crankshaft vibrations, engine failures, such as worn rod bearings and a broken crankshaft, may result.
In regards to harmonic balancer I have a 91 Honda Accord and have had following symptoms: car vibration, noise like metal, battery light is on, belt is not spinning and BF said pulley is not spinning after taking a look. Any theories on what it is or where to start? Desperate for help and not a lot of money to fix, thank you.
This direct replacement harmonic balancer features a stress-resistant rubber bond to properly absorb engine vibration. Stringent standards help ensure excellent tensile and impact strength for greater durability.
To understand the function of a harmonic balancer, you need to first comprehend torsional vibration. According to Fluidampr, torsional vibration is the slight twisting and rebound of the crankshaft under torque during the power stroke. During each revolution of the crankshaft, the connecting rods and pistons are essentially slammed against the crankshaft as air and fuel are compressed within the cylinders. The crank actually flexes and unwinds, acting like a spring and creating torsional vibration.
Located on the crankshaft opposite from the end to which the flywheel is attached, the harmonic damper (or balancer) is charged with absorbing, or dampening, all this torsional vibration.
Although these names are used interchangeably, it is technically only a harmonic balancer when used in conjunction with an externally balanced crankshaft, which uses things like a harmonic damper/balancer or flywheel to balance the rotating assembly. (Internally balanced assemblies are able to rely solely on the crankshaft counterweights for balancing.) Whether the engine application is internally or externally balanced, the primary goal of the harmonic damper is to dampen torsional vibration or engine harmonics.
Based on design, there are several types of harmonic dampers. Most stock harmonic dampers are elastomer; however, there are three scenarios in which you would want to replace or upgrade from your stock damper:
These types of harmonic dampers can be pricier than their elastomer counterparts, but they often handle vibration through a broader rpm range. Because the fluid is not bonded to the damper like an elastomer design, it is unlimited in its ability to move and can be even more effective as rpms increase.
Choosing the right diameter comes down to a multitude of factors, including engine cubic inches, intended use of the vehicle, engine stroke, rpm range, and torque. All of these can affect the choice of diameter as well as harmonic damper mass. In addition, the use (or future use) of power adders can play a role in picking the right size since superchargers and nitrous shots can put additional forces on your crankshaft.
As a rule of thumb, the longer the stroke and greater the torque, the larger the diameter and mass. However, larger dampers can affect the acceleration and revving ability of an engine, so the right diameter and mass can help you strike the right balance. Manufacturers offer nodular iron, steel, and aluminum harmonic balancer options to help you dial in the right amount of mass for your application.
If your harmonic damper will be used for competition, you may be required to use an SFI 18.1-approved damper. To meet this approval, a damper must be driven to a rotational speed between 12,500 and 13,500 rpm and maintained there for one hour. During this time, no part of the damper can become loose or separate.
Now that you have determined what LS engine harmonic balancer pulley offset you have, next step is to confirm or cross-reference the recommended Fluidampr performance damper part number with the original OEM year, make and model. 781b155fdc