Awesome … or Sacrilegious! Meet the Nissan NX K24 Swap.

Here are a few of the screens available on the MMM Engineering digital dash. The main screen offers a speedometer, tach, water temp, oil temp & pressure, fuel gauge, and E content to name just a few. I first met MMM Engineering when they were a college student – now a business person with a fabulous start-up company! It pulls most of this information from my ECUMaster Classic.

What has been mentioned so far is rather straightforward and typical in any shop that fabricates race cars. What happened next is the challenge. Making everything fit the chassis – and that took some ingenuity. I’ve already mentioned that AES Auto fabricated motor mounts – standard work for them while doing an engine swap. Next was the drivetrain components between the Honda engine and the Nissan chassis. That was challenging but that may even have paled in comparison to connecting the intriguing Nissan wiring to this swap. While this is not a daily driver, it is still a fun weekend car. As a result lights, signals, defrost/heat, and a range of other items needed to be functional. On the street this car is awesome. It is a challenge not to chirp the wheels. And AES is still sorting out the idle with this high-strung car and its 80mm K-Tuned throttle body, 750cc injectors, DC 2.2 cams, and its 12.5:1 compression. My initial track day feedback is that the car is nice and stiff. The motor is not flexing.  And the feel is just right. So now it is time to take a look at the process of this swap. Well, most of this swap – there are some aspects of it that you’ll have to work with AES Auto for more details.

There are kits out there to assist with K swaps into all kinds of cars – but there’s nothing for a swap into a B13 Nissan. This meant that the engine mounts were just one of many items developed and fabricated in-house at AES Auto.

 

Neat. Precise. Beefy. Some looking under the hood were pretty impressed with these mounts.

 

While the SR20DET had four mounting spots for the engine; the K24 is secured by 3 mounts custom fabricated by AES Auto. Virtually no one can see this mount which is underneath the car. It is a huge plus is combined with a crossbar that replaces the Whiteline 4 point control armbar that I couldn’t live without. This holds the front of the car together very soundly – plus the lowest point of the car is now about 1.5 inches higher than previously.

There was no question that the axles would be a challenge, but before that could be addressed another issue presented itself. The engine had been in and out of the engine bay a few times to allow for the facilitation of the mount builds, but always without the exhaust in place. As the engine and header were put into place it was obvious that the subframe and the beautiful K-Tuned 4-1 race header were simply not willing to coexist. They were literally crashing into each other by a significant margin. This led to a discussion of options – extending the header, for example. But cutting a beautiful piece of workmanship was a challenge not to mention that the ground clearance would be nil. Revising the recently fabricated motor mounts – but again a drastic loss of ground clearance. And the eventual solution of cutting and sectioning the subframe – effectively boxing in the exhaust with upper/lower framing – was the selected option. Ironically enough, while the subframe simply provided no room, the actual body shell itself was built in such a way that it provided all of the room in the world. It was like it was built for the K-Tuned Race Header. And by the way, I’m still looking at the exhaust on the firewall side of the engine bay and thinking that this looks wrong. For those of you thinking that the Honda K24 in a Nissan B13 is wrong, then I’ll give you a point on this fact. Other than that, this engine is fantastic and I’m smiling non-stop. The sound that this naturally aspirated engine makes when it is revving to over 8000 RPM is simply fantastic. And the pull right through to the top of the RPM range is equally fantastic.

16 comments

  1. DAMN VERY NICE. IS THERE A SWAP KIT FOR SELL ON THIS K20 INTO B13 SHELL. IM SURE ALOT PEOPLE WILL BE INTERESTED SINCE THERE SO MANY PARTS OUT THERE FOR THESE K20 MOTORS.

    1. Upgraded, thank you so much. You’re very aware of the struggle that I’ve had the last few years. And know that a lot of thought went into this decision. Thanks so much for introducing me to AES Auto!

  2. This K24 engine is simply silly fast. WHP drop from 360 to 280 – but at the first track day I was out all day and as long as I wanted each session with temps barely rising. I haven’t had a day like that with the DET ever.

    1. It’s like Honda put the things it learned in the past into the K24 and made available in many platforms — Decent power, good reliability with potential for upgrades.

  3. I don’t think we got a final pic of the subframe, but it seemed like there had to be more crossbracing than the one bar with the motor mounted in it, right?

    Also, that’s a 4-2-1 header that’s installed.

    Hey, congrats on the build. It should be bulletproof.

  4. A little sad to see the SR go, but nothing better than having a track car that just works every time and nothing to think about! 280whp on a mustang is plenty of power. It would probably trap 115-120mph in the 1/4.

  5. And for reference, my old B14 SE-R with T25 and JWT S3 cams put down 250whp on a dynoject and trapped 110mph. The poor stock VSLD wore out which made the car about worthless on an auto-x. Not too bad on a road course with big enough turns to keep from lighting up the inside tire.

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