TECH ARTICLES

Why AMS Recommends Race Balance Shafts

Written by AMS Performance

 

In our experience using a stub shaft when removing balance shafts can increase the chances of oil pump failures. This can be caused by the lack of support provided by the rear bearing on the original balance shaft. The support is needed to prevent the oil pump gears from pushing apart and wearing into the aluminum pump housing. Once the process begins the gears can continue and wear enough to cause them to seize. During this whole process the aluminum that is being worn away can enter the clean oil stream and contaminate engine bearings and other components causing them to wear prematurely.

To help prevent this process we have come up with a way to support the oil pump gears and still remove the rotating mass. We start with a stock balance shaft then, spin it in a lathe to make sure there is no radial run out. This ensures that the shaft will spin true in the bore and not cause premature bearing wear. We then machine the weights and extra material off in a precision lathe and re measure run out to verify nothing changed during the machining process. All parts get cleaned thoroughly and are ready for installation. In the pictures below you will see the differences in the three shafts available. There are also substantial weight differences in the three shafts as seen below.

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SHOP PARTS

NOT LEGAL FOR USE ON POLLUTION CONTROLLED MOTOR VEHICLES. THIS PRODUCT IS FOR RACING COMPETITION ONLY AND IS NOT LEGAL FOR USE ON HIGHWAY OR STREET VEHICLES, OR OTHER NON-RACING COMPETITION OFF-ROAD VEHICLES.

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This policy only applies to installers and/or users who are in the United States, customers who reside in other countries should act in accordance with their local laws and regulations.

Some AMS Performance upgrades may solely be used on vehicles in sanctioned competition which may never be used upon a public road or highway, unless permitted by specific regulatory exemptions (such as a CARB E.O.). For state specific details please visit the following website: http://www.semasan.com/emissions

It is the responsibility of the installer and/or user of the product to ensure that it is used in compliance with all applicable laws and regulations. If a product was purchased in error, do not install and/or use it. The purchaser must arrange to return the product(s) for a full refund.

All performance modifications and installations are at the customer’s own risk. AMS Performance holds no responsibility either implied or otherwise for mechanical, electrical or other failure when using any aftermarket performance products.

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