If you've ever sat at a red light next to a cammed ka24de, you know that distinct, choppy idle that sounds more like a mini-muscle car than a typical Japanese four-cylinder. It's a sound that immediately tells everyone in the vicinity that this isn't just another stock 240SX with a loud muffler. For years, the KA24DE was mocked as a "truck motor" because it came in the Nissan Hardbody and the Frontier, but those of us who have spent time behind the wheel know that these engines are actually hidden gems once you give them some room to breathe.
The reality is that the KA24DE is a torque monster compared to its more famous sibling, the SR20DET. However, where it usually fails is in the upper RPM range. Stock cams are designed for fuel economy and low-end grunt, which means the engine usually falls flat on its face right when things should be getting fun. Swapping in a set of performance cams changes the entire personality of the car. It turns a lazy, reliable commuter engine into something that actually wants to scream toward redline.
Why people love the cammed sound
Let's be honest for a second: half the reason anyone wants a cammed ka24de is for the idle. There's something incredibly satisfying about that "lope" or "chop" that happens when you increase the cam duration. It sounds aggressive, purposeful, and raw. When you're idling in a parking lot or at a meet, that sound does the talking for you.
But beyond the aesthetics of sound, the performance gains are real. The KA has a massive 2.4L displacement, which is pretty big for a four-cylinder. Because it's got that displacement, it can move a lot of air. The stock cams are like trying to breathe through a straw while running a marathon. When you upgrade to something like a Stage 2 or a 272-degree cam, you're basically opening up the lungs of the engine. You'll notice the car pulls much harder from 3,500 RPM all the way to the top.
Choosing the right cams for your build
Choosing cams for a cammed ka24de setup can be a bit overwhelming because there are a few legendary names in the game. You've mostly got Jim Wolf Technology (JWT) and Brian Crower (BC) as the heavy hitters.
If you're looking for something that's relatively "plug and play" without having to rebuild your entire head, the JWT S3 cams are basically the gold standard. They offer a great bump in power without making the car impossible to drive in traffic. They have a nice little lope, but they don't require upgraded valve springs, which is a huge plus if you're on a budget or doing the work in your driveway.
On the other hand, if you want that rowdy, shaking-at-the-stoplight feel, you go with something like the Brian Crower Stage 2 or Stage 3 cams. The Stage 2s (264 duration) are a fantastic middle ground. You get a significant power increase and that classic cammed ka24de sound, but you really should look into upgraded valve springs and retainers at that point. If you go Stage 3 (272 duration), you're entering the territory where the car might be a bit of a handful to drive daily, but the top-end power is absolutely worth it if you're hitting the track or drifting.
Supporting mods you actually need
You can't just throw cams into a stock motor and expect it to work perfectly. Well, you can, but it's going to run like garbage and you might break something. To really get the most out of a cammed ka24de, you need to think about the supporting cast.
First and foremost is the valvetrain. If you're going with aggressive cams, your stock valve springs are going to struggle. At high RPMs, the valves might not close fast enough—a nightmare scenario called valve float. Getting a set of dual valve springs and titanium retainers is cheap insurance. It allows the engine to rev higher safely, which is exactly where your new cams are doing their best work.
Then there's the air coming in and out. A set of cams is useless if your exhaust is restricted. You'll want a decent 4-2-1 header to maintain some of that low-end torque while helping the top-end flow. Pair that with a 2.5-inch or 3-inch exhaust, and the engine will finally feel like it's unchoked.
The importance of a good tune
I see this all the time: someone builds a beautiful cammed ka24de, spends a fortune on parts, and then tries to run it on the stock ECU. Don't do that. When you change the cam profile, you're changing how much air the engine takes in at different times. The stock computer has no idea what's going on and will likely run the car way too lean or too rich in certain spots.
At the very least, you should look into an RS-Enthalpy tune. Martin at Enthalpy has been tuning these KAs for decades and knows exactly how to make a cammed setup sing. If you have the budget, a standalone ECU like a Haltech or Link is even better, but for most street builds, a chipped stock ECU works wonders. A proper tune will smooth out the idle so it doesn't stall, and it'll make sure the power delivery is linear rather than patchy.
Living with it every day
Is a cammed ka24de a good daily driver? That's the big question. Honestly, it depends on your tolerance for "race car" problems. It's going to vibrate more. It's going to be louder. You might have to give it a little gas to keep it from stumbling when the AC compressor kicks on.
But for many of us, that's the whole point. There's a visceral connection to the machine when you can feel the engine thumping through the steering wheel. It makes a boring trip to the grocery store feel like a lap at Willow Springs. Plus, the KA is a tank. As long as you keep oil in it and don't overheat it, it'll handle the abuse of higher-lift cams for a long, long time.
Another thing to consider is fuel economy. You're going to lose some MPGs. There's no way around it. When you increase duration and overlap to get that cammed ka24de performance, you're essentially wasting a little bit of fuel at low RPMs to gain power at high RPMs. If you're worried about gas prices, maybe keep the stock cams, but if you're reading this, you probably care more about smiles per gallon anyway.
The "DE-T" factor
A lot of people think cams are only for Naturally Aspirated (NA) builds, but a cammed ka24de with a turbocharger is a legitimate beast. The KA's iron block can handle a lot of boost, and when you pair that with cams that allow the turbo to breathe better at the top end, you end up with a power band that feels endless.
If you're planning on going turbo later, keep that in mind when picking your cams. Some cams are specifically "turbo grinds" with less overlap to prevent boost from blowing straight through the combustion chamber and out the exhaust. However, even a set of "NA" cams like the JWT S3s work remarkably well on a boosted KA.
Final thoughts on the setup
Building a cammed ka24de is one of the most rewarding things you can do for a Nissan chassis. It takes an engine that was meant for hauling plywood and turns it into a high-revving, fire-breathing heart of a drift car or a spirited street car.
It's not just about the numbers on a dyno sheet; it's about the character. The way the car shakes at a stoplight, the way the exhaust note changes from a low growl to a metallic scream as you pass 5,000 RPM, and the way the throttle response sharpens up. If you're tired of people telling you to just "swap an SR" or "LS swap it," do yourself a favor and cam your KA. You might be surprised at just how much fun that "truck motor" can actually be.