On another message board a member writes"A lot of engine builders will not run the fluidampr, they say they can crack a crank"


Is this true......or BS??

BS I ran 2 for years with zero issues - one at 800 hp. Bearings were always fine.

Lots of people run Fluidamprs without any issue. I've run them on multiple race engines without causing any issues. These days I prefer to use an ATI balance but only because the ATI has more options for fitment than the Fluidampr. If you search the race section you'll find that a lot of guys have run a Fluidampr on their race engines without any issues.

True, as in every dampner can break a crank under the right conditions. So the real question should be, is the fluidampner you have chosen the right/best solution for your application.
It is a "BS" statement you have shared from the other board in that it omits a lot of important details.

I remembering hearing in the early 1990s that the racing fluid dampeners, all brands, would break crankshaft when the motors were revved up above 5000 RPM with the outside air temps near freezing if the owner didn't let the motor run for at least 5 to 8 minutes to warm the fluid up in the dampeners. Back then we did not have the communications like we have today so maybe that rumors was just that, a made up rumor
Big diesel engines have used them for a long, long time in all kinds of applications with no big failures on their cranks that have been reported in all kinds of climates and job applications

I run a fluid dampner on mine. 700 passes and counting on my 572. runs over 7000 rpm. Bearings always have looked good.
Doug