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Old 02-08-2015, 07:48 PM   #221
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Can someone smarter than me tell me why my napkin math for hz to RPM doesn't match what I find online? I am messing around with Helmholtz resonator dimensions and I am currently converting between RPM and Hz like this:

Hz=RPM/2
-----60


Sources online just use RPM/60 which doesn't take into account that there are two crankshaft rotations for every time the intake valve opens. Also, would halving a doubling the resonance frequency have a significant effect? For example, half of the peaks at 35hz will fall in line with 70hz.
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Old 02-08-2015, 09:47 PM   #222
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has to travel the length of the runner twice, the 2s cancel.
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Old 02-09-2015, 11:51 AM   #223
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If anyone is curious, these are the rough numbers for the stock na8 helmholtz resonator:


I measured the chamber volume by how many grams of water it took to fill. For the neck I took dimensions but with all the curves it won't be as accurate.
It looks like they targeted a twice the ideal frequency in order to make the peak wider.
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Old 02-10-2015, 12:07 AM   #224
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Quote:
Originally Posted by asmasm View Post
Hah. A little of both.

This was my garage when I moved in:


and then I rented a construction dumpster:



Poobs:
I am still making progress on carbon versions but it is very slow. I have an infant and work deadlines taking up the majority of my time.
Send it to me and I'll make a two part mold. Wet layup with the right resin can easily hold up to the heat, and while covering the part with reflective heat barrier may not seem sexy, it will protect the part and keep the intake air cooler.
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Old 02-10-2015, 12:28 AM   #225
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I actually do like the little shelves on the right but they should have been in the back where the 2 big doors are at.

Last edited by triple88a; 02-10-2015 at 12:41 AM.
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Old 02-10-2015, 12:09 PM   #226
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Can we please has NB version nao plz kthx?
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Old 02-10-2015, 06:30 PM   #227
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Quote:
Originally Posted by cordycord View Post
Send it to me and I'll make a two part mold. Wet layup with the right resin can easily hold up to the heat, and while covering the part with reflective heat barrier may not seem sexy, it will protect the part and keep the intake air cooler.
Bonus points for quoting the giant pics
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Old 03-06-2015, 05:55 PM   #228
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PM'd ya asmasm.
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Old 03-06-2015, 08:00 PM   #229
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Still waiting for NB plz.
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Old 03-15-2015, 09:13 PM   #230
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I am making big changes to my work schedule, in part so I have more time for this. My composites oven is wired and ready, and I have finally solved the issues I have had with ABS plugs self destructing. I also registered an LLC, and have done a bunch of work to reduce kit costs as far as possible. One example- For people who need an IACV fitting the best option is a silicone intakes port system but it costs $15. I am having a small steel press bender machined so I can make washers with the correct curve:

That will allow me to install a fitting for $3.40 which means kits that kits with an IACV connection will be $11.60 cheaper.

Last edited by asmasm; 03-15-2015 at 09:51 PM.
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Old 03-15-2015, 11:45 PM   #231
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Wow, this is good news! Awesome!
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Old 03-21-2015, 07:08 PM   #232
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Finding 90 degree elbows with a long bend radius is not easy. If anyone knows of a source please let me know. Silicone intakes sent me a perfect elbow about a year ago but they have more the one supplier and half the time you get one that looks like this.

So far I have ordered about a dozen different 2.5" elbows and these are the standouts:



Also, this is finally close to done.

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Old 03-21-2015, 07:17 PM   #233
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If you want a long radius use a mental elbow and just a coupler on the end. I needed the tight radius version from silicone intake to clear everything. The SIs people seem really responsive I bet they would send you a long one if they called.
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Old 03-21-2015, 09:00 PM   #234
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Quote:
Originally Posted by asmasm View Post

Finding 90 degree elbows with a long bend radius is not easy. If anyone knows of a source please let me know. Silicone intakes sent me a perfect elbow about a year ago but they have more the one supplier and half the time you get one that looks like this.

So far I have ordered about a dozen different 2.5" elbows and these are the standouts:
I'm pretty sure these guys can make you whatever you need, but $$.

Turbohoses Custom Design, Engineering & Manufacturing

http://www.turbohoses.com/technical_assistance.htm
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Old 03-22-2015, 03:20 PM   #236
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Can I buy one of these yet?
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Old 03-22-2015, 03:23 PM   #237
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What he said ^

It has been really cool watching the development process too. Looks like your getting close!
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Old 03-24-2015, 12:06 PM   #238
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Good work man !!!
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Old 03-28-2015, 05:23 PM   #239
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Why not cut an elbow to the correct length and then 3d print plastic duplicates?
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Old 05-08-2015, 04:46 PM   #240
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My plug is now at a pro level of finish. Its hard to believe there are glued together peices of ABS that came out of of a consumer grade printer under there.


Mold production is next. I am going to do a split mold and lay up each piece separately with carbon bending slightly around the flange. In order to trim the parts for a clean join line to insert carefully cut steel shim stock between the part and the mold flange an then sand away the excess material. That should give me the correct dimensions to the tolerance of the shim stock thickness and keep me from ruining each mold.
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