Why AMS recommends Race balance shafts
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Why AMS recommends Race balance shafts
Why AMS recommends Race balance shafts
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.
http://www.amsperformance.com/store/...oducts_id=1550
The shaft wearing out or Spinning a balance shaft bearing take a while to do.
Removing the balance shaft can be attributed to preventative maintenance
Eric
When building a motor most people remove the balance shafts to prevent from having a balance shaft belt failing and taking out the timing belt and such.
The shaft wearing out or Spinning a balance shaft bearing take a while to do.
Removing the balance shaft can be attributed to preventative maintenance
Eric
The shaft wearing out or Spinning a balance shaft bearing take a while to do.
Removing the balance shaft can be attributed to preventative maintenance
Eric
-Troy
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It is generally recommended that you remove the balance shafts if you're trying for very high RPMs - i.e. in excess of 8500. Since the shafts spin at twice the RPM, they may become a liability as you rev the engine higher. IMO, the AMS kit is especially nice if you're road racing or Autocrossing, since it provides some support during high cornering loads.
If you plan on tuning with the stock ECU, however, I would strongly recommend sticking to a lower RPM limit and keeping the shafts in there. I have a built 2.0 with the AMS race balance shaft kit, and the stock ECU does not like the extra noise _at_all_ - especially between 3000 and 4000 RPM.
l8r)
If you plan on tuning with the stock ECU, however, I would strongly recommend sticking to a lower RPM limit and keeping the shafts in there. I have a built 2.0 with the AMS race balance shaft kit, and the stock ECU does not like the extra noise _at_all_ - especially between 3000 and 4000 RPM.
l8r)
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I have the regular stubby shaft in my DSM and polyurethane motor mounts, the vibration really isn't as bad as people say. It seems like it revs up a little quicker as well.
