Installing a k20 oil pump kit for k24 engines is one of those modifications that most people consider mandatory if they're planning on making real power. If you've spent any time on the forums or hanging out at local meets where K-swaps are the main event, you've probably heard people talking about "deleting the balance shafts." It sounds technical, but it's really just about getting rid of the heavy, parasitic components inside the K24 oil pump that keep the engine from reaching its full potential.
The K24 is a fantastic motor—don't get me wrong. It's got torque for days and it's relatively affordable compared to some of the high-strung K20s. But Honda designed it for heavy family cars like the Accord and the CR-V. Because of that, they wanted the engine to be as smooth as possible for the average driver. To achieve that buttery feel, they put in a massive oil pump equipped with dual balance shafts. While that's great for a grocery getter, it's a bit of a nightmare for anyone trying to build a high-revving performance machine.
Why the Stock K24 Pump Just Doesn't Cut It
The stock K24 oil pump is basically a victim of its own design when it comes to racing or spirited driving. Those balance shafts we talked about? They're heavy. They take a significant amount of energy to spin, and they're designed to rotate at twice the engine's speed. So, if you're revving your K24 out to 8,000 RPM, those shafts are screaming at 16,000 RPM.
Beyond just the weight, there's the issue of oil aeration. At high RPMs, the stock K24 pump can actually start whipping air into the oil. If your oil is full of tiny air bubbles, it's not lubricating your bearings properly. That's how you end up with a spun bearing and a very expensive paperweight in your engine bay. By switching to a k20 oil pump kit for k24, you're ditching those shafts entirely. This not only frees up a few horsepower—usually somewhere between 5 to 10 wheel horsepower—but it also lets the engine rev much more freely and safely.
What Actually Comes in the Kit?
When you buy a complete kit, you aren't just getting the pump itself. Since the K20 pump (usually the one from the RSX Type S or the Civic Type R) is physically smaller and shaped differently, you can't just bolt it on and call it a day. Most kits will include a few specific parts to make the swap work.
First, you've got the pump itself, often referred to by its part code, the PRB pump. Then there's the oil pump chain. The K24 chain is too long because it has to wrap around those bulky balance shafts, so you'll need the shorter K20 chain. You'll also need a new chain guide and a tensioner.
One of the most important pieces is the windage tray and the baffle plate. These help keep the oil where it needs to be—near the pickup—instead of splashing all over the crank when you're taking a hard corner. Finally, you'll usually get a specialized bolt and a plug. Since the K24 block has an extra oil passage that fed the old balance shafts, you have to plug that hole to ensure you don't lose oil pressure.
The Installation Process and What to Watch For
Let's be honest: this isn't exactly a five-minute job. You're going to have the car on jack stands, the oil drained, and the oil pan removed. It's a bit messy, but it's totally doable for a DIYer with some patience. However, there is one part that makes most people a little nervous: the "notching."
Because the K20 pump was never meant to sit on a K24 block, there's a small section of the block's casting that gets in the way. You have to take a grinder and carefully shave down a tiny bit of the aluminum on the block to let the pump sit flush. It's not a lot—just a little corner—but it's definitely one of those "measure twice, cut once" moments. Most people find it helpful to put some grease on the pump, mock it up, and see where the grease transfers to the block. That shows you exactly where you need to grind.
Once you've got the clearance, you plug the oil hole. If you don't do this, you're going to have a massive internal oil leak and your oil pressure will be in the basement. Most kits provide a simple bolt or a press-in plug for this. After that, it's just a matter of timing the chain correctly and bolting everything back together.
How This Mod Changes the Way Your Car Drives
The first thing you'll notice after installing a k20 oil pump kit for k24 is how much faster the engine feels like it wants to rev. It's like the engine finally had its hiking boots taken off and was given a pair of running shoes. The throttle response feels crisper because there's less rotating mass for the crankshaft to fight against.
But the real benefit is the peace of mind. If you're running a K24 with a K20 head (the classic "Frankenstein" build), you probably want to rev that thing to 8,500 RPM to take advantage of the VTEC crossover. With the stock pump, that's a gamble every single time you hit redline. With the K20 pump, you can sit at high RPMs all day long without worrying about the oil foaming up or the pump failing. It's the standard for a reason—it just works.
Another thing to consider is your oil pan. Depending on which K24 you have (like the K24A2 from the TSX versus a K24Z series), you might need to swap your oil pan to a K20 version to clear the new pump and pickup. It's always a good idea to double-check compatibility before you have your car torn apart in the garage.
Is It Worth the Effort?
You might be wondering if it's worth spending a few hundred bucks and a Saturday under the car just to change an oil pump. If you're just driving your car to work and back and never hitting VTEC, then no, you probably don't need it. The stock pump is perfectly fine for daily commuting.
But let's be real—if you're looking into a k20 oil pump kit for k24, you're probably not looking for a boring commute. You're looking for performance. In the world of K-series tuning, this is one of the "big three" reliability mods, right up there with a good baffled oil pan and a solid timing chain tensioner. It's about building a foundation. You wouldn't put a massive turbo on a motor with weak internals, and you shouldn't build a high-RPM K24 without a pump that can keep up.
At the end of the day, it's a relatively cheap insurance policy. Engines are expensive. Rebuilding a block because you starved the bearings of oil is a lot more painful than spending a weekend installing a better pump. Plus, the extra bit of power and the improved engine response are a nice little "thank you" from your car for taking care of it.
If you're planning on doing any track days, autocross, or even just some spirited canyon carving, this is a modification that belongs on your short list. It transforms the K24 from a "truck motor" into a true enthusiast engine that's ready to scream. Just make sure you get a high-quality kit that includes all the gaskets and the oil hole plug, because the last thing you want is to be halfway through the job and realize you're missing a five-cent part that stops the whole project in its tracks.