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When we talk about performance, your mind probably immediately goes to bigger turbos and high-flow injectors. Makes sense - those are vital pieces of the power puzzle. But there's another component in your engine that plays a major role in how all that air and fuel will actually perform: the camshaft.

Let's take a deep dive into why the camshaft is often referred to as the 'heart and mind' of a performance engine, and why understanding valve timing is the key to a cohesive build.

Why Should I Consider Upgrading My Diesel Camshaft?

Many owners assume that if they want more power, they can simply crank up the boost. However, boost is actually a measure of airflow resistance. An optimized camshaft improves airflow as air enters and exits the cylinder, which leads to several benefits:

• Lower Exhaust Gas Temperatures (EGTs): By perfecting the timing points, you can move heat out of the engine more efficiently and keep exhaust temps lower at your usual operating RPMs.
• Reduced Engine Strain for Big Horsepower Builds: A good cam lets you make more horsepower at higher RPMs, with a torque curve that lowers peak cylinder pressure on the rods and pistons.
• Improved Torque Curve: It isn't just about making more torque but making that torque usable in the RPM range where you actually drive.

How Do I Match a Camshaft to My Diesel Build?

A common mistake we encounter is folks treating engine components like islands. Your engine works like a team of components, each needing to be well matched to the others to perform at its best. For example, if you run a massive turbo (like an S472) but keep a stock cam profile, the engine will struggle to get on top of the charger, leading to a laggy, frustrating ride.

• The "Stage" Trap: Avoid buying a "Stage 1" or "Stage 2" cam just because of the name. These terms are often ambiguous and mean different things at different shops. The key takeaway is that each upgrade stage should incorporate several components for the best results.
• Component Synergy: You must match the camshaft profile to your turbocharger’s compressor wheel size and your transmission’s stall speed to ensure the transient response (how fast the truck reacts when you hit the gas) remains sharp. Fueling systems, and even rods and blocks need to be upgraded for the seriously high horsepower builds.

Keep in mind that reaching a peak power number on a dyno and daily drivability are two different things. So, upgrading just the turbo may deliver more power, but its peak efficiency will be limited by other components, and eventually it may damage the injectors, transmission, and other parts. Always start with a good step-by-step plan with a specific goal in mind. A fast daily driver, heavy-duty tow rig, or drag racing build all have different requirements that need to be addressed from the very start of the build.

What is "Low Shock Technology" and Why Does it Matter?

Diesel valvetrains are heavy and experience significant harmonics. Bringing Low Shock Technology over from the NASCAR world was the best way to solve this. Essentially, it loads the valvetrain before the valve is fully accelerated.

While the camshaft can be profiled to get the valves to operate over a wide range of timing and duration settings, if the valve springs can’t keep up, it just won’t work effectively. Low Shock Technology ensures the system is settled and stable, which drastically increases the longevity of the components.

If you try to open a valve too fast, it puts demands on the valve gear that the materials can't handle. Low Shock Technology works by:

• Pre-loading the system: The cam lobe is designed to load the pushrod, rocker arm, and bridge before the main lift event occurs.
• Eliminating slack: It takes up the compliance in the metal components so that when the valve finally needs to jump into peak acceleration, the parts are already settled and pressurized against each other.
• Managing Harmonics: By avoiding a crash into the valve, the valve spring is prevented from vibrating like a tuning fork, which is a common cause of part failure in high-performance diesels.

What Makes Choate’s Camshafts Different from the Competition?

It comes down to surface engineering. Through the MSE (Micro Surface Enhancement) process, we've moved away from just looking at roughness (Ra) and now focus on effective bearing area. While many aftermarket cams have about a 30% contact area, Choate’s MSE-processed cams offer over 90%. This means the lifter floats on a much larger surface, virtually eliminating the tracking or wear marks often seen on lesser shafts.

Is a Camshaft Upgrade Worth It for a Daily Driver or Tow Rig?

Absolutely. While many Power Stroke or Duramax owners wait until an engine overhaul, the benefits to drivability are immediate. For Cummins owners, the swap is even more common because the cam can be pulled out the front. Some of the benefits of a cam upgrade include:

• Significant Reduction in Exhaust Gas Temperatures (EGTs): By optimizing the valve timing points for your specific RPM range, a performance camshaft allows the engine to breathe more efficiently. This helps protect your engine during long highway hauls or when pulling a trailer.

• Better Transient Response (Drivability): A properly matched camshaft improves how quickly the engine reacts to your foot on the pedal. OEM cams are often profiled for emissions, while some aftermarket cams are too aggressive for the street. A Choate-spec cam is sized to help your turbocharger spool up faster, making the truck much more responsive in stop-and-go traffic.

• Increased Engine Longevity and Reduced Fatigue: Upgrading to a camshaft with Low Shock Technology and improved surface finishing (MSE process) reduces the physical stress on your engine.

• Improved Fuel Mileage: Because the engine doesn't have to fight as much resistance to flow (boost) to get air into the cylinders, it operates more efficiently during normal road use.

Choate Engineering Designs Turnkey Solutions

At Choate Engineering Performance, we don't just sell parts; we provide a finish-line strategy. Whether you're trying to save a 6.4L Power Stroke from bending rods or looking to make your 5.9L Cummins breathe more freely, we know what it takes to do the job right.

Camshafts are an integral component of any build, and a generic ‘stage one’ or ‘stage two’ cam is simply not going to do the job. Don't settle for a rebuild that keeps the same factory flaws, or adds new ones.

Check out the diesel lineup at Choate Engineering Performance to experience these proven benefits:

• Real Problem Solving: We specialize in solving the real problems found inside today’s most popular diesel power plants, including Duramax, Power Stroke, and Cummins. Our engines are fully remanufactured and re-engineered to outperform factory designs.
• True Remanufacturing: We reman diesel engines - meaning every detail is inspected, machined, and upgraded to meet or exceed OEM specifications. Unlike a simple rebuild, which may reuse parts and skip precision machining, our reman process corrects known weak points.
• Advanced In-House Machining: Our reman diesel engines are designed and machined entirely in-house using advanced 4- and 5-axis CNC equipment, flow benches, and precision balancing technology. We eliminate OEM design flaws.

Visit Choate Engineering Performance today and get your engine and cam setup right the first time - we are here to help you get the most out of your diesel today!