Adjustable Camshaft Gear

Adjustable Cam Gear
Fits 2007 - 2009 HD Chain Drives
Contact for availability
$249.95 + shipping

2 years in design and development. Patent Pending.

Now you can adjust your cam timing from -10 degrees to +10 degrees. With this gear you can move the torque band up or down the RPM band.

You will also be able to adjust and tune the camshaft exhaust valve closing to gain the most power with the exhaust that you are using. The three graphs below show examples of advancing and retarding the cam timing of a particular engine. The gear was the only thing that was adjusted or changed. The AFR was not adjusted, but if it was, the torque and horsepower would have a higher reading. This shows the gains that can be made by moving the cam timing around until you locate the most power for you application.

This animation is of a two cycle engine. It has the same type of wave theroy as the four cycle engine. Imagine the wave that travels back up the exhaust at the same time that the exhaust valve is opened.

Notice where the TQ begins, peaks and where the HP drops off.

TQ is about 80 @ 3000 RPM...TQ peaks at 4300 RPM...HP drops off at 5500 RPM

TQ is about 84 @ 3000 RPM...TQ peaks around 4300... HP starts to drop off @ 5800 RPM

This graphs shows that +5 degrees provides the most power.
TQ is 90 @ 3000 RPM...TQ peaks at 4000 RPM...HP drops off at 6100 RPM

Install the gear the same as the factory gear.

Once installed, the gear is easily adjusted by loosing the locking nuts, turning the crank bolt until the desired cam timing shows up in the window of the the cam gear.
Then just tighten the the lock nuts.

Please read the "Exhaust" article to help understand
the theory of exhaust waves and the importance of valve timing.
Exhaust Article Link

No matter what exhaust and camshafts that you are using, they are
not timed exactly to produce the maximum power.

Hemrick Performance:

Nine Time Undefeated Dyno Shootout Winner 2008 - 2009