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Old 01-16-2015, 11:56 AM   #821
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Quote:
Originally Posted by AndyHollis View Post
Ummm...you guys do know that there has been a factory turbo K-series for a long time now.. 07-12 RDX has the K23A1 rated at 240/260.
Sorry, I'm a K-series Noob. Brand new info to me.

Has anyone considering trying to run that exhaust manifold and turbo with a custom DP on a k-swaped miata? It looks like intercooler routing for a front mount IC would be a pain.


Insight to the k23a1 engine - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum



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Old 01-16-2015, 12:08 PM   #822
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Old 01-16-2015, 12:12 PM   #823
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touche sir... Damn that's cheap.
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Old 01-16-2015, 12:23 PM   #824
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Quote:
Originally Posted by cyotani View Post
Sorry, I'm a K-series Noob. Brand new info to me.

Has anyone considering trying to run that exhaust manifold and turbo with a custom DP on a k-swaped miata? It looks like intercooler routing for a front mount IC would be a pain.


Insight to the k23a1 engine - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum



We may or may not have a k23a1 on an engine stand right now. It could be made to work, but will need some other custom parts since it is very different than all other K series engines. Jury is still out if it will be a cost effective option.
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Old 01-16-2015, 03:11 PM   #825
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Is that manifold aluminum? Wat?
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Old 01-17-2015, 11:46 AM   #826
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test drive = success.

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Old 01-17-2015, 12:10 PM   #827
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Quote:
Originally Posted by K Miata View Post
We may or may not have a k23a1 on an engine stand right now. It could be made to work, but will need some other custom parts since it is very different than all other K series engines. Jury is still out if it will be a cost effective option.
My understanding is the K23 is a taller motor, so swapping into a miata would probably be problematic.

That may only be if you're keeping the stock intercooler, but anyway, it's much more cost effective and easy to just turbo a K20/K24.

And yes, the RDX has an aluminum turbo manifold with integrated water ports to keep the manifold "cool".

K23 looks interesting on paper but in the real world I don't think they make a lot of sense.
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Old 01-17-2015, 12:29 PM   #828
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Quote:
Originally Posted by Efini~FC3S View Post
And yes, the RDX has an aluminum turbo manifold with integrated water ports to keep the manifold "cool".
This is a very interesting feature. I am no Honda OEM engineer but why would you want to cool an exhaust manifold. Doesn't this just reduce the efficiency of the exhaust gasses by dissipating additional heat? I could see it maybe as a reliability feature I guess but other than that I am left wanting. Does anyone know the reason this is done?
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Old 01-17-2015, 04:03 PM   #829
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Quote:
Originally Posted by Ryan_G View Post
This is a very interesting feature. I am no Honda OEM engineer but why would you want to cool an exhaust manifold. Doesn't this just reduce the efficiency of the exhaust gasses by dissipating additional heat? I could see it maybe as a reliability feature I guess but other than that I am left wanting. Does anyone know the reason this is done?
I used to be a Honda OEM engineer... :wink:

The water cooling is necessary to keep the aluminum at a temperature that won't negatively effect the material properties...like staying solid...

Most aluminum casting alloys have a melting point around 1100F.

Compare that to common EGTs seen in a turbo manifold and I think you'll see why they needed water cooling in the exhaust manifold.

I'm not sure what alloy they used for the RDX exhaust manifold but I'd be willing to bet it was one with a higher melting temperature than normal casting alloys.
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Old 01-17-2015, 04:12 PM   #830
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I think the question is really why bother using aluminum? What's the point? Lowering underhood temps and weight?
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Old 01-17-2015, 07:23 PM   #831
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I would think primarily weight.
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Old 01-17-2015, 07:49 PM   #832
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As further evidence of how light the Honda motor is, here's the final product. This is now a manual steering car with no a/c. The nose is so high that max camber is still slightly positive (.5 degree). Can't wait to get some suspension on this thing...


Yeah, three Mazdas...

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Last edited by AndyHollis; 01-17-2015 at 08:42 PM.
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Old 01-17-2015, 10:50 PM   #833
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Very nice, good work.

how does she drive?
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Old 01-17-2015, 11:08 PM   #834
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that header looks beast. nice work!
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Old 01-17-2015, 11:19 PM   #835
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Any plan for a heat shield between the header and that washer bottle? Or a relocation of the washer bottle?

Got my subframe/mounts this week and I picked up the rest of my parts (minus flywheel) from David today. I need to do some engine bay cleanup still but things are moving.
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Old 01-17-2015, 11:23 PM   #836
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Any plan for a heat shield between the header and that washer bottle? Or a relocation of the washer bottle?
.
The latter, if it becomes an issue.

I'm more worried about underhood heat issues overall with that header...

Quote:
Originally Posted by 18psi View Post
how does she drive?
It feels like what a Miata should have always had for a motor. Big fat torque (for a 4-banger), but not excessive.

The stock suspension is comical, though...especially with no front camber.
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Old 01-18-2015, 04:10 PM   #837
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-anybody have exact weight savings vs stock engine?
-for the non-DIY types like me, what would this setup cost turnkey at 200whp (assuming that's stock output) and 250 ish whp ? assuming I drop off the keys to a stock NA, for example.
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Old 01-18-2015, 04:14 PM   #838
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Quote:
Originally Posted by endura View Post
-anybody have exact weight savings vs stock engine?
-for the non-DIY types like me, what would this setup cost turnkey at 200whp (assuming that's stock output) and 250 ish whp ? assuming I drop off the keys to a stock NA, for example.
This swap has not been out long enough to answer this question accurately. And it will depend greatly on your location and the reputability/ labor cost per hour of the shop you use. Maybe a good estimate is to take the v8 swap kit cost estimates at shops for labor and add it to the price of a k24 and the kmiata kit and all other nic nack parts.
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Old 01-18-2015, 04:33 PM   #839
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Quote:
Originally Posted by endura View Post
-anybody have exact weight savings vs stock engine?
-for the non-DIY types like me, what would this setup cost turnkey at 200whp (assuming that's stock output) and 250 ish whp ? assuming I drop off the keys to a stock NA, for example.
Based on some rough numbers I came up with, weight is about the same. Not enough to be a deciding factor IMO.

Andy, what were your before/after numbers?

Last edited by emilio700; 01-18-2015 at 07:56 PM.
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Old 01-18-2015, 05:03 PM   #840
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So is the elevated front end merely a factor of no PS or A/C?

Doesn't seem like that would be enough.
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