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Old 01-10-2016, 12:09 PM   #301
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This is the problem with sharing a design and not having control over the quality of the printing. Also, it turns out that most consumer grade 3d printers suck at large hollow structures made from ABS.

Ideally you want to find someone with a good quality printer and a heated build chamber setup.

I can send you the info for the guy I use to print my plugs, but he doesn't do assembly or acetone vapor bath. I do that part myself. Acetone vapor baths are not super difficult but you will need to buy a few things to do it. There is some info online, just don't do it inside and don't use an open flame for your heat source. Also, if you are unsure, have a plan to deal with a solvent fire.
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Old 01-10-2016, 01:50 PM   #302
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Sounds good, I found a local guy here in Indy who is an engineer and went to Purdue. He has a Makergear m2 and wants to meet me at a brewery to discuss the plans. Sounds good to me! I'll let you know how it comes out.
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Old 01-16-2016, 02:29 PM   #303
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Do you have the cad drawings for the filter heatshield? Does anyone know if the rc-9310 will clear the ac rad?
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Old 01-16-2016, 02:48 PM   #304
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FWIW the rc-9310 is used for the 3d printed kits but not the carbon version (the OD of the part is much smaller with the carbon and uses 2.5" filters and elbows).

No idea what will or won't clear the AC since I don't have it on my car. I think the rc 9310 is a pretty tight squeeze.

I abandoned the heatshield. I made a crude one and tested it, there was not a measurable difference in IAT.
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Old 01-16-2016, 03:23 PM   #305
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Quote:
Originally Posted by asmasm View Post
FWIW the rc-9310 is used for the 3d printed kits but not the carbon version (the OD of the part is much smaller with the carbon and uses 2.5" filters and elbows).

No idea what will or won't clear the AC since I don't have it on my car. I think the rc 9310 is a pretty tight squeeze.

I abandoned the heatshield. I made a crude one and tested it, there was not a measurable difference in IAT.
Sounds good. I think I'll wait until the 3d part comes back and measure what filter I can fit in there. I may position the 3d part on the hood latch area since I have aero latches and no hood latch I'll just cut a hole on my garage star panel. My car doesn't have the round whole yours has.
I'll post a picture and silicone part numbers when im done.
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Old 01-16-2016, 03:25 PM   #306
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if oyu want to mock up the filter location, you can line it up under the radiator support hole.
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Old 01-25-2016, 11:08 AM   #307
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The design I have been working with was built around the original 3mm plastic wall thickness. Moving to 1mm carbon walls there is a lot of clearance, which is good, but the design is less optimal than it could be. Also, my labor on these is out of control. The process currently looks like this:

Lay up two halves under vacuum (this is the easy part)
->Oven cure for 12 hours
Trim flanges by hand
Place halves back into mold and tack corners with epoxy
->Oven cure for 6-8 hours
Fill gap with hysol 1c
-> Oven cure for 6 hours
Sand joint smooth to about 200 grit
Laminate strips of carbon over joint and vac bag
-> Oven cure for 12 hours
Hand sand and polish final part

There is a ton of hand trimming and sanding and parts have to wait on 4 epoxy cure cycles.

On the new redesign I have used up the available space better- The flat section is thicker and less wide. I also modeled it with surfaces so it can go into cad software easily. The plan is to move the process over to some machined aluminum or fiberglass molds and then bladder mold biaxial sleeves in one shot. No joining, minimal trimming, one epoxy cure cycle.




Compared to the last version:




Another small detail. I also adjusted this design to be a more viable option for over the radiator intercooler piping. I would probably throw an extra layer of carbon into those and I would want to use a resin with a TG closer to 250F. It should be doable at only a small cost difference (maybe 10%?)
Attached Thumbnails
3d printed intake for N/A NA miatas-80-yfo2jqf_d7170a4b24acaf3edf953d4fff6d1b5062d7fb4c.png  

Last edited by Joe Perez; 02-03-2016 at 07:54 PM. Reason: Put the comparison image inline
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Old 02-03-2016, 07:52 PM   #308
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Working link to .stl file? A local group in Ohio wants me to run a few prototypes at our University Lab that I currently work in. We have a dimension 1200 and Uprint(both ABS with heated chambers), a projet and a connex (polyjet), a smaller abs printer, a nylon printer with carbon, kevlar, and fiberglass inlay, and finally, an SLS printer.

Thanks!

-Josh
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Old 02-03-2016, 08:27 PM   #309
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It's on the thread. Look for it, he has several updates, find the last one and the link works
Quote:
Originally Posted by cravenju View Post
Working link to .stl file? A local group in Ohio wants me to run a few prototypes at our University Lab that I currently work in. We have a dimension 1200 and Uprint(both ABS with heated chambers), a projet and a connex (polyjet), a smaller abs printer, a nylon printer with carbon, kevlar, and fiberglass inlay, and finally, an SLS printer.

Thanks!

-Josh
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Old 02-04-2016, 06:46 PM   #310
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Quote:
Originally Posted by btabor View Post
It's on the thread. Look for it, he has several updates, find the last one and the link works
Well, evidently, I cannot find his thingiverse model (404). Also, the .rar file on his site is broken. So, who has either an .stl or even better a .sldprt for it?
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Old 02-04-2016, 10:17 PM   #311
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I'll re-upload the rar. It shouldn't be broken.
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Old 02-05-2016, 07:18 PM   #312
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I just got my 3d intake and I am about to install it. However, I dont have that round hole in my car. I bought a 3" hole saw, the one on the passenger side is 2.75". Should I return it and get a 2.75" hole saw or will the extra room help the intake move with engine movement and not crack?
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Old 02-05-2016, 07:20 PM   #313
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The stock hole is oval- I would go with a 3" hole if it is going to be round.
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Old 02-11-2016, 12:47 AM   #314
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I finally got around to running the CFD. The new tube is much improved over the old tube. I compared it to a traditional 90 of the same diameter tube (2.5") since I was curious. This new tube even outflows that!

The CFM numbers speak for itself and give a good summary of the new design which flow 12% better for a set 0.25 PSI pressure drop.

NOTE: RUN AT 0.25 PSI! Not 2.5 PSI (I will edit this pics when I get home).





The best plot to see the differences between the tubes is the velcoity plot. All of the tubes show higher velocity around the bend. But the new design does the best job of keep the velocity consistent throughout the tube, especially around the bend. It's a major improvement over the old design.






Here are the pressure and flow tragector plots just for the hell of it.










Attached Thumbnails
3d printed intake for N/A NA miatas-80-results_00c646b6db315f1d16ac0a569ffdcdd465508d37.png   3d printed intake for N/A NA miatas-80-velocity_cut_plots_33f52ff8367fd22f09664bb93ca9953987637edc.png   3d printed intake for N/A NA miatas-80-pressure_cut_plots_2a877c60fe4e8d6be6d9bb8ada161db4a69284b9.png   3d printed intake for N/A NA miatas-80-flow_trajectory_8791ceb1ab75f96cb93bb3e9471b9b6ff1e89611.png   3d printed intake for N/A NA miatas-80-summary_458b10600d3a31feb26fddde583f5c3aeb7635bb.png  


Last edited by cyotani; 02-11-2016 at 11:21 AM.
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Old 02-11-2016, 01:10 AM   #315
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I like pictures.
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Old 02-11-2016, 01:21 AM   #316
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Quote:
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OK guys, I think you might need to call this the "Cobra CAI"
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Old 02-11-2016, 01:36 AM   #317
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Indeed, it does sound better than the 3d printed intake for N/A
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Old 02-11-2016, 08:52 AM   #318
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Awesome results. I guess the clean sheet design was worth it. A naturally aspirated miata engine is never going to flow close to 350 CFM. An online calculator says a engine with 2000cc displacement at 8500rpm and VE of 110 would be consuming 240 cfm.

Yeah, I probably need a name for it. I was thinking just Durham Composite intake.

Also, everyone should be giving cyotani props for doing CFD for me.

Last edited by asmasm; 02-11-2016 at 09:40 AM.
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Old 02-11-2016, 09:51 AM   #319
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I saw yesterday on discovery dream cars
and I immediately thought to this topic
from 13 minutes
maybe some inspiration for you

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Old 02-11-2016, 10:02 AM   #320
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The youtube version is blocked in the US but I found it on daily motion:
http://www.dailymotion.com/video/x3rdsi7

That is the first time I have seen someone do bladder molding with wet layup, which is my plan. They are doing resin infusion which I am not planning on. It is interesting that they aren't using any flow media, breather material, or release material.
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