CVD/CVA Building Tips

The CVD axles are often overlooked as a place to invest some additional time sanding and polishing.  If you build your CVD using the instructions from the kit, the CVD will work fine, but you will be leaving some performance on the table.  A little fine sanding with 2000 grit sand paper can reduce the friction in the CVD joints, which can result in a faster car.

The first piece to looks at is the small cylinder called the CVA coupler.  Use 2000 grit sand paper to polish this part.  If there are any metal burs on the end that was tapped for a set screw, use a small hand file to remove those burs and then polish that section as well using 2000 grit sand paper.

The CVA bones will also need some polishing.  Use sand paper on the slot and in the main cylinder hole.  This will reduce friction on the CVA coupler and the CVA cross pin.

I usually use a piece of 2000 grit sand paper rolled tightly around one of my Hudy hex head tools when sanding the inside of the CVA bone.

Once I am done sanding the CVA bone, I like to swipe the inside the CVA bone with a paper towel.

Next, assemble the CVA bone, CVA coupler, CVA axle, CVA cross pin, and retaining clip as instructed in the manual.  Don’t use the black grease, though.  The black grease is too thick.

Once you have the unit assembled, use Tribo comm drops to lubricate the assembly.  The Tribo drops get rid of friction and these drops stay on really well during races.  Normal bearing oil will fly off of the assemblies.  The kit’s manual suggests the black grease, but I think the black grease is too thick and sticky.

Here is a picture of the fully assembled CVD/CVA unit.  It should feel very smooth throughout its range of motion.

There is a bit of debate regarding the set screw.  Technically speaking, you probably don’t need to use it since the retaining clip can hold the unit together.  It is up to you if you want to run the set screw.  As long as the set screw does not cause any binding within the assembly, the set screw should be used since it can improve the long term reliability.  In some cases, the set screw may cause the assembly to bind.  If you decide to run the set screw, double check to make sure it is not causing any binding.

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