After completing our core Milwaukee-Eight camshaft test, we decided to dig deeper into how surrounding components influence horsepower and torque output. Our goal was to test real-world combinations to help riders make more informed decisions when upgrading their Milwaukee-8 engines.
For this follow-up test, we used the same Harley-Davidson Milwaukee-8 test bike equipped with a Wood Performance WM8-222 camshaft. However, instead of stopping at the camshaft alone, we changed two key components: the exhaust system and the air cleaner.
Component Swap Breakdown
First, we replaced the previously tested exhaust with our Jackpot Road & Track 2/1 system. This performance exhaust is known for its excellent flow characteristics and backpressure balance, particularly in mid to high RPM ranges.
Next, we swapped out the stock Screamin’ Eagle air cleaner for the K&N Filtercharger. This air intake is a heavy breather-style setup with a large elbow, designed to draw in cooler and denser air, which increases overall engine efficiency.
Results on the Dyno
We ran the updated configuration on our Dynojet 250i dyno, and the results were impressive. Both horsepower and torque numbers increased significantly, especially in the midrange and upper RPMs. The WM8-222 cam showed strong gains when paired with the higher-flowing components. Compared to the previous setup, the new combination provided a broader powerband and smoother throttle response.
We’ve included the dyno chart below to show the comparison between both cam and exhaust combinations. The difference clearly illustrates how camshaft performance is directly influenced by other engine components.
Final Thoughts on Milwaukee-Eight Camshaft Test
This Milwaukee-Eight camshaft test highlights the importance of matching your camshaft to the correct exhaust and intake system. It’s not just the cam that delivers power—it’s the entire recipe. If you’re planning a cam upgrade, consider these supporting modifications to get the most out of your build.
Looking to build your own Milwaukee-Eight setup? Contact Fuel Moto for expert guidance, tuning support, and everything you need to bring your build to life.