Thanks for posting.

What do you estimate the cost of building a k series engine using this approach? Anyone with experience with k series engines building please revise this list.

$300 k24 block
$400 k20a2 head
$150 s2000 intake manifold
$500 k24 12.5 Weisco pistons
$700 k24 Manly Rods
$720 Kelford 179-A Cams
$300 valve springs?

$3070 so far

Any recommend other items? Any ARP hardware required? New bearings? Price for all required gaskets and seals?

rods will be more like $350-$400, you don't need the $700 turbo tough rods.

If you are going with 12.5 compression, use the Kelford 179-B, not the A. The B has a lot of overlap so the dynamic compression is lower than running that same piston with the A cam. On pump fuel, the A could result in some det issues at 12.5. Stock cams definitely will (BTDT). And the B makes more power anyway(i use it in most of my motors).

If you do want the 179-A, then you don't need upgraded valve springs. It uses the OE springs.

ARP head studs are advised with higher compression motors. ACL bearings, if you need new ones.

Lots of online Honda OE parts places out there to look up prices. HondaAcuraOnline.com is one I use a lot, though I usually order stuff through HPD (racer discount).

I think you are taking my tone incorrectly. I REALLY, REALLY want to do this, but I am trying to see if I can budget this all together and realistically do it. I believe you that it will be the best track Miata set-up out there. I believe you that your parts are quality. I believe you when you say your Medusa header is a value, I really do. My problem is that I need to budget it. I am researching more and more each day, but perhaps I should clarify my constraints and ideas on the car.

-I cannot afford to rebuild an engine and all I can get is 91 octane anyways, so I will attempt to find a K24A2 ready to go and swap in the 50 degree VTC gear and some drop-in cams suggested by Andy.

-This car will be a full-interior car, but with a rollbar, door bars, and seats mounted to the floor. I will still have a stereo.

-I plan on XIDA's and I already have some 15x9's ready to go.

-Where are you guys finding $1200 K24A2's? I live in the middle of nowhere, so junkyards around here don't have anything but rusted out domestics and my ebay searches have only turned up $1500+

So considering my power goals involve a bolt-on K24A2, to get the engine in my car and running, what do you estimate the cost to be?

I appreciate everyone's responses to my previous posts, they helped me determine that I cannot afford to rebuild an engine and that I need to find a K24A2 from 06-08 ready to go.

What gearing is everyone planning on using? I currently have a 6 speed and a 3.9 rear. I have a 3.6 sitting on the shelf and there is a 4.3 for sale on the forum. What direction should I be going for that? I will be running either 205/50 or 225/45s.

^listening very, very closely.

My problem is great I just put 8k in my car its faster... I just went up 2-3 classes. If you do TT or want to be the fastest kid on the block great but the car doesn't fit in anything but tt classes anymore And I'll just spend more money in brakes and tires. Honestly $8k will buy me another project car. not sure if/ when i'll go the Honda route. I love everything Honda I'm sure it will happen eventually but I'm in no hurry. I'd rather spend money on track time.

Other good thing is if you have an NB there's a good amount of money you can recoup by selling off parts and aftermarket parts. I could prob sell 3k worth of parts off my car. so 8k-3k = 5k at the end. 5k is a supercharger kit but I get to keep that NA potential.

There was a tsx engine on ebay in Oregon 2 days ago for $740 + 200-250 shipping. 130k miles. Maybe you need to look harder. Deals are out there search car-part, ebay, clist. search for TSX engine not k24a2

I got an 06 K24A2 for $1,000 off Honda-tech. Guy was local and had it listed for $1200 so I threw him a $1000 offer. He said no and then 2 weeks later said yes.
I'm running a 6 speed and 4.1 rear for now. Not really planned, just what I have in the car.
If I had your engine it would be harder to justify. I have time to send text messages on the straights with my 1.6 :giggle:

here i am selling 400whp bp shit so i can stuff a 200whp honda in my car. sheesh

^X2. Doesn't make any sense.

No harm no foul, I don't think your tone is out of line at all. I think you have legit questions that we hear all the time. Glad to hear you like the concept.

Your ideal build sounds exactly like ours. Stockish k24a2 in a street car that runs really quick lap times, complete with xidas, that is OEM reliable and has an overall low cost of ownership and consumables.

I've bought engines from car-part.com, and from fellow Honda guys in my area. I've purchased 3 k24a2 engines, and have paid between $900 and $1200 for them. Current one in the Miata was $1000.

I like the 6 speed and 4.10 combo in my car. Its perfect for a k24a2 with an 8000rpm redline.

A little off topic, but to answer your question, 225 tires are the obvious choice for a K powered car, if not the new 245 RC1s :)

Total cost is hard to nail down. On our website, the FAQs say that you can expect to spend $8000-9000 on a total conversion. Maybe some customers (Nick, Josh, Andy) can chime in on that, but we feel its a safe bet. Last thing I want to do is get customers 75% through a build and then they run out of cash.

What's this about a cheaperish header? Or is the $1200 unit the only choice?

Sounds like I'll be building one of these in the next few months, are there still kits available?

Here is another random question: is it possible to maintain cruise control? If you haven't had a Miata with it, it acts directly on the throttle pedal through a mechanical linkage.

After doing the numbers, I like the 3.9 with the 6-spd. It matches up perfectly with the gears I run in the CRX. For sure, the 3.6 will make 1st and 2nd more usuable, but for track use, I want the more frequent shifts (3-4) to be the two in the middle. Up/down, up/down...with no diagonal action to encourage a miss-shift. And 6th is still tall enough to be a good highway cruise gear, yet close enough for big tracks like VIR, COTA and Daytona. As a side-benefit...you can simply find an entire package from a wrecked 2000 SE...diff and trans.

Be prepared to be nickel-and-dimed to death depending on what comes with the engine you get. Alternator, starter, wiring harnesses (charge and engine), are typically extra. And if you want the RSX-S factory oil cooler setup, you need those parts, plus the right water pump housing/thermostat.

Good question.

My car has factory cruise, so I am headed down that road. I can't do One Lap w/o cruise. The nice thing about the Miata is that the cruise actuates the pedal, not the throttle body. And there is nothing in the KMiata kit that physically interferes with it's postion in the bay. I just need to look into the electronics a bit.

There was just 2 k24a2's for sale by a friend of mine in my area. One with about 70k on it asking $1300 and one with 100k on it asking $1000. I was too tempted to snatch one up.

But proves the point you can find these motors easily enough. If your in the middle of nowhere, expect to be traveling to a more populated area for a "deal".

One in chicagoland for sale right on on one of the local facebook groups:

"K24A2 longblock from a 2005 TSX with 96k miles 1,200.00 FIRM. Comes with accessories and XTD flywheel for free."

I'd rather buy a $1200 XTD flywheel and get a free k24A2 longblock with accessories for free.

I went through the wiring diagrams this evening regarding cruise control. Looks like it should work just fine with zero effort so long as the vehicle speed sensor is plugged in. The instrument cluster processes that input, displays it, and has a separate output that goes to both the cruise control computer and the PCM. The cruise computer has no other connections to the PCM, so its removal should have zero effect.

And since the controls are on the stalk, not the steering wheel, installation of a race steering wheel won't be an issue either.

Win.

That's awesome Andy. Keep me posted on how it works out. I love this idea.

seems like a lot of people doing k swap are here.
I'm another one working on the swap.
This swap is not cheap though, I'm over $10k but haven't even started on the actual swap nor ordered the k miata header yet.
To make it fair, I'm also rebuilding my engine, so good amount went in there as well.
I'm guessing I still need about $3k more to finish my car.
I do have excel sheet that I kept log with about 98% of stuff I bought for this swap, but I don't think this file really goes along with this thread.

engine build thread here
Another K24/K20 Frank Project, Shooting for 260whp - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum

What year car are you doing the swap in?