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Old 08-15-2014, 06:49 PM   #141
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Yeah. The models need to be water tight no open edges or self intersections. I usually make sure I get rid of all ngons and only have quads and triangles. 3dsmax has a modifer called STL check that will tell you if the mesh passes - then just Export>STL. Also, I use shapeways to double check scale and units are set correctly.
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Old 08-15-2014, 06:54 PM   #142
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Maybe i should give it a try..
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Old 08-16-2014, 12:04 PM   #143
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Curly will probably jump in with more details but he sent me info on the dyno results for stormin'normans car:
Stormin's stash of memories with Lexi - Page 70 - ClubRoadster.net

This is a dyno graph of a coldside U bend intake VS the setup I sent to curly. Mine is the green line:


Very encouraging results and I will try and get carbon versions and heat shields going soon.
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3d printed intake for N/A NA miatas-lexi_zps80a8fc5e.png  
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Old 08-16-2014, 01:50 PM   #144
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Those are some great results. I love diy r and d
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Old 08-16-2014, 02:27 PM   #145
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So over the course of a 4th gear pull the intake air temps would drop anywhere from 8-15 degrees. On one of the later runs the temp started at 90 (ambient was low/mid 70s) and dropped to 75 by the end of the pull. It consistently did this over and over. I am inclined to believe that this intake is a worthwhile benefit on an NA miata and I'd love to trial it further on orego moms upcoming VVT swapped NA.
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Old 08-16-2014, 02:35 PM   #146
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Were those IATs for both intakes?
Edit: Really what I am wondering is if it is possible to figure out how much gain is from cooler air vs the dynamics and flow of the intake path. I know from my testing on the highway that the IATs are very close to ambient when driving. If the intake itself actually does as well or better than the other design when IATs are taken out of the equation that is a huge win.
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Old 08-16-2014, 02:53 PM   #147
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That was for your intake, the coldside intake would heatsoak and stay roughly the same temperature during the pulls whereas your design consistently cooled the intake temps every time.
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Old 08-16-2014, 04:32 PM   #148
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Once you do a pull it really starts sucking in cooler air, and yours was cooling down 5-15 degrees during a pull. I did a datalog for every pull, I'll post them soon.
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Old 08-16-2014, 06:35 PM   #149
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plots make sense. longer intakes are better. sourcing cooler air is better.

not being on cr.net is better.
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Old 08-16-2014, 08:10 PM   #150
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Quote:
Originally Posted by curly View Post
Once you do a pull it really starts sucking in cooler air, and yours was cooling down 5-15 degrees during a pull. I did a datalog for every pull, I'll post them soon.
The logs would be great. I want to pick a handful of points along the dyno curves for each intake, look at the IAT, and then try a rough correction for how each of them compare if the IAT were the same. That should give me a good sense for how much power is temp related and how much is intake geometry. From the description it sounds like its about 50% of each going on. That air temp difference is going to be something like a 3% density change. I am very confident that I can functionally eliminating heat transfer from the engine bay or radiator into the intake air (at least until it gets to the very hot intake manifold).
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Old 08-17-2014, 12:10 PM   #151
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I did a data log of the IAT with the sensor in the filter. It still heat soaks a little. On an 80 degree day I am seeing 95 degrees after getting everything totally hot and then letting it sit for 15 minutes before restarting the engine. That is way better than before when I had 140f MAT in the same circumstances.

Also, these GM IAT sensors seem to react to big air temp changes on a curve. Like on hot restart It will quickly drop 5-7 degrees but then progressively more slowly get back to the actual air temp. It seems to take at least 5 minutes to get back to being accurate but the last few degrees doesn't make a impact on AFRs.

Last edited by asmasm; 08-17-2014 at 07:49 PM.
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Old 08-17-2014, 05:48 PM   #152
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Very nice results.
Josh, we may need to look at something better than Nail's CS setup if it wasn't really performing that great.
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Old 08-17-2014, 06:09 PM   #153
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I'm thinking some sort of 3D printed carbon fiber intake?
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Old 08-17-2014, 06:32 PM   #154
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Sounds good. When will they be available?
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Old 08-17-2014, 08:23 PM   #155
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Some day? I have a vacuum pump on its way to me and I will pick up the fiberglass supplies I need to make molds. I also need to get a new version 3d printed to be the plug. This part is fairly technical to lay up since it is a split mold that is too narrow to fit your hand into.

One nice thing about the carbon versions is the 1mm wall thickness will allow me to fit a 2.5" flange filter without having to change the inner diameter. I just ordered a filter with perfect dimensions that is only $30 compared to the $55 K&N I have been using.

Also, is there anyone in durham with a 1.6l car and a stock engine I could measure off of? I think I need to make a crossover for 1.6 cars that makes an arc to clear their coolant hoses and thermostat neck.
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Old 09-02-2014, 05:59 PM   #156
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So just to be a wiener, where the NB model is at?

Glorious thread, I've not been keeping up. Keep up the good work!
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Old 09-05-2014, 03:23 AM   #157
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Quote:
Originally Posted by asmasm View Post
Also, is there anyone in durham with a 1.6l car and a stock engine I could measure off of? I think I need to make a crossover for 1.6 cars that makes an arc to clear their coolant hoses and thermostat neck.
I am just printing your intake now just for fun out of PLA. I currently have a 1.6 in my car but am installing a 1.8 in the upcoming months. If you want I'll sit it in the engine bay, take some photos and measure it up for you. I've ordered some ABS so I can print it for use later.
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Old 09-05-2014, 01:31 PM   #158
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So extreme newb question here.
So I find a company in my area that does 3D printing and send them this file and ask if they can make it?

Done?
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Old 09-05-2014, 01:38 PM   #159
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Yeah basically. I would recommend you look on MakeXYZ and the filter the results by material type (ABS plastic). You will probably need to get it printed in 2-3 pieces. ABS is prone to warping during print and the printers that do the best results are closed off and heated. I have a version in the included files for printing as two parts. You can glue the parts together with abs cement from the plumbing isle at home depot. The joints made with it appear to be stronger than the rest of the part so no issues there. I have also used it to make repairs.

Total cost to get it printed ought to be in the $100-$200 range. Also, make sure they do an acetone vapor bath on the part/parts as it makes them much stronger.


Alternatively, I have a few prototypes kicking around that are only very slightly different than the one I sent to curly. PM me if you want one of them.
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Old 09-05-2014, 02:50 PM   #160
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Adding notches in the part on the cut plane makes gluing together multiple pieces much easier. Especially on circular parts where you can clock the part at the wrong angles when gluing causing misalignment.

3dhubs is another alternative for a local 3D printing source.
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