Latest News  »  May 2012 News

Engine Builder Magazine Tells Harmonics Like It Is.

engine builder - april 2012 cover


"If you could take a camera and place it in the oil pan while the engine was running, you would probably think that the crankshaft was made out of Jello." - Engine Builder, "Smoothing Out The Stress." April 2012

Bob McDonald, tech writer for Engine Builder magazine, tells it straight about the term "harmonic balancer" and explains the what, why, and best solution for controlling destructive engine harmonics.

Click Here To Read Article.






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Fluidampr Featured On Motorz TV

Chris Duke, host of Motorz TV, highlights the benefits of installing a Fluidampr Performance Diesel damper on a recent Partz segment.

Watch Here




From The Tech Desk: Parts 2 - Will Fluidampr Solve An Out Of Balance Condition?

keg meda/kris carroll 'smoothster' show truck engine

How to Balance an Engine with a Fluidampr Installed
To recap last month’s enews the function of a Fluidampr performance damper is to protect the engine by reducing crankshaft torsional vibration.  It is a common misconception that a Fluidampr, or any damper, literally ‘balances’ the engine (for simplicity, let’s assume we’re just talking about the damper controlling torsional vibrations and leave the internal v external balanced engine designs for a later date).

Balancing the rotating assembly involves calculating the amount of rotating weight and reciprocating weight, putting it on a balancing machine, then adding or removing weight from the crank to fine tune the desired performance.  Neglecting a professional balance job during an engine build or get it wrong and you can experience a lot of potentially devastating damage.  This weight unbalance vibration happens once per revolution and has a low frequency.  The torsional vibration that is the twisting and rebounding of the crank and is controlled by the damper is caused by the combustion cycle in each cylinder.  It happens multiple times per revolution and has a higher frequency.

fluidampr cutawaySome prefer or need to balance the rotating assembly with the damper and flywheel installed.  An engine builder must be aware that special instructions apply with a traditional Fluidampr.  To control a broad range of harmonics across all rpms, the inside of a Fluidampr performance damper is comprised of a free floating inertia ring that shears thru a thin layer of viscous silicone. The bearing gap area is about the thickness of a sheet of paper on either side.  Torsional vibration must be present to engulf the inertia ring and center it.  This happens immediately on the first revolution.  A balancing machine can not replicate combustion forces and produce the speed fluctuations to generate torsional vibration.  On a balancing machine a traditional Fluidampr performance damper is never operating and the inertia ring will always show a slight false reading in the overall balance.  If the engine builder is not aware of this, once the build is complete and firing you would be faced with an unbalanced engine!

During manufacturing, both the Fluidampr housing and inertia ring are high speed balanced to spec on industrial quality computer spin balancers.  Therefore, the proper procedure to balance a rotating assembly when using a Fluidampr is as follows:

fluidampr with removable hubInternally Balanced
Balance the rotating assembly with no harmonic damper installed or the stock OEM damper.

Externally Balanced
If permissible on your Fluidampr performance damper, remove the hub/counterweight from the damper and install it on the crank when balancing.  If the hub/counterweight can not be removed, install the OEM damper with its counterweight.

The exception is our CT Gold series dampers, featuring centering technology that will permit an engine builder to balance the rotating assembly with the damper installed.