posted on November 30, 2011 21:57
Project Defiant1: KA24DE Built Part 2: The Devil's Details
By Justin Banner
The KA24DE, the engine that Nissan should have installed in the 240SX from the start and where many should have started with before moving on to the SR20DET. The dual camshaft engine offers a larger displacement, no rocker arms to break, and a cast iron block that makes it very easy to turbocharge, so long as you don't go stupid on it. Also, just because parts are there, doesn't mean you can just throw it all in there! You need to check your measurements, check the work, and then put together a winning engine that will blow the doors off those JDM-only idiots.
|DAWW, ain't it cute? This is a prime example of the SR20DET. Now it's time to start MAN-SIZING! (Sorry, Walker, I couldn't resist!)
To be honest, you'll notice that a majority of these pictures are taken mostly after I've put a majority of the engine together. What I hadn't realized is 1. MotoIQ hasn't done a Budget Engine Build article... EVER. 2. A boring, detailed engine build could actually help you guys who are doing this in your backyard, too. 3. The first article really made it seem like I just tossed pistons in and had not checked anything. The reality was I had, I just wanted to keep it quick and interesting. Call this the "Certified Legit" portion of the engine build!
|How it came back from the machine shop, not bad, huh?
If you put your trust in a machine shop that puts out quality work, they will do a good job. In this economy, they have no choice! If they do a bad job and word gets out, their reputation is ruined and they'll almost certainly never get it back. There is a local machine shop nearly in my backyard, but I choose to drive 45 minutes into Richmond and use a NAPA machine shop because of the backyard shop's bad reputation. They guys at Chamberlyne Avenue did a great job for me, despite a small dispute with a charge (which I am still glad they did even now)!
|Hey, they are boxed for a reason! Always send the pistons you intend to use along with your engine block to your machine shop!
When you send your engine to the machine shop, send your pistons with it! Doesn't matter if it's OEM or JE Pistons, if your machine shop knows what it has to work with, the better and easier your job is! Again, I trust these guys, but always check the block because you never know what might happen during machining or even as you transport the engine. Chamberlyne didn't disappoint me, as the block came out clean, stripped, and within specification!
|Always do a little "house cleaning" after getting your block back. It will pay off in the end!
Thursday, December 01, 2011 8:36 AM
I love that first pic: the mesh over the turbo inlet. It looks as if it wants to suck in some parakeets.
Thursday, December 01, 2011 9:38 AM
Good overview of what goes into engine assembly.
Didn't know KA's had a main girdle like that! Sweet! Extra displacement and truck motor strength... why was the KA always shit on? Seems like a winning recipe for a turbo build.
Remind's me of the iron block 2.0->2.3 setup I have in my miata...
Thursday, December 01, 2011 10:51 AM
I know this is a budget build, but next to the Plastigauge, is that rust on the crank rod journals or just dust and shop crud?
Is polishing rust out easy to do on a budget build without removing the crank and chucking it up on a lathe to do the shoestring and emery cloth trick? Does it really matter and will the bearings absorb/wipe away the crap?
Not trying to be a troll. I don't have any room to throw rocks. You should see my junked boat engine...waiting to do a SBC 383 swap. Great project and thanks for doing the write up!
Thursday, December 01, 2011 10:55 AM
@SuperCharger.Heaven: Mesh on turbo inlet. "Can't have an air filter slowin' me down yo!" (umm...yeah...) Concur on parakeets!
Thursday, December 01, 2011 11:14 AM
Yeah, it was just some crud I didn't totally remove when I took the picture.
As far as shoestring and emery cloth, when I used to work on cars for a living, I'd do it on vehicles that just got a bearing replacement and the crank wasn't damaged or just had surface rust. I wouldn't use much pressure and wouldn't take off much, if any of the surface. Other than that, if it was scored or covered in rust I would replace a crank.
Thursday, December 01, 2011 5:36 PM
Awesome i am in the process of building a KA24DE myself for turbo duty, will keep an eye on this...
Thursday, December 01, 2011 9:41 PM
Keep it coming Justin!
Hey didn't we miss some sort of deadline? Hmmmmm....... :-)
Thursday, December 01, 2011 9:45 PM
Deadline, what deadline? :P
Yeah, it was supposed to be ready and on the road, TODAY. Of course when I made that deadline I had a real shop to work in instead of being outside or having to use my dad's sign shop.
Friday, December 02, 2011 4:09 AM
Wheres the editors note this time? lol
Friday, December 02, 2011 9:06 AM
"What I hadn't realized is 1. MotoIQ hasn't done a Budget Engine Build article... EVER. 2. A boring, detailed engine build could actually help you guys who are doing this in your backyard, too. "
So true! Thanks for writing these articles!
Saturday, December 03, 2011 5:21 PM
BTW, I am at 100 Drifters of December at Summit Point Motorsports Park, WVA and I will be judging tomorrow. If you haven't gone down there, tomorrow will be the day I make my Judging debut to make up for the non-debut of Defiant1. $10 gets you in, $75 gets you drifting on THREE TRACKS!
Saturday, December 03, 2011 9:32 PM
Haha, good luck then your Honor!
Monday, December 05, 2011 10:08 AM
Can't wait to see the final outcome. Great read in the meantime.
Tuesday, December 06, 2011 7:34 AM
I went to that shop on Chamberlayne over the summer for a valve job on my 4A-GZE. The work was phenomenal, BUT they did not correctly adjust the valve clearances (which was supposed to be included in the cost of the valve job) which resulted in my car being down an additional two weeks while I sourced the right shims.
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