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Old 02-17-2016, 09:32 PM   #921
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I have a local guy who just finished a CNC plasma table who is itching for excuses to use it. If somebody can make a cad file in a format he can use I can get parts made for teh cost of material and shipping. Cheaper if somebody will send/ get me a piece of scrap aluminum to use.
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Old 02-17-2016, 09:33 PM   #922
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Quote:
Originally Posted by vehicular View Post
I have a local guy who just finished a CNC plasma table who is itching for excuses to use it. If somebody can make a cad file in a format he can use I can get parts made for teh cost of material and shipping. Cheaper if somebody will send/ get me a piece of scrap aluminum to use.
Madjak posted his cad file in his intake manifold thread.
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Old 02-17-2016, 09:38 PM   #923
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I posted it 2 hours ago in this thread! For the later model heads, the holes need to be moved down 15mm? (I think it's 15mm, can someone confirm?). I can make the CAD for it if someone can print it out and check.
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Old 02-17-2016, 09:39 PM   #924
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Originally Posted by Madjak View Post
I posted it 2 hours ago in this thread! For the later model heads, the holes need to be moved down 15mm? (I think it's 15mm, can someone confirm?). I can make the CAD for it if someone can print it out and check.
My manifold is off for decking right now so I could check it for you.
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Old 02-17-2016, 09:42 PM   #925
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I should have said a file of the NB head flange in a format he can use. You guys are jackals sometimes.
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Old 02-17-2016, 10:03 PM   #926
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I should have said a file of the NB head flange in a format he can use. You guys are jackals sometimes.
here you go: NB_Inlet_Flange

Try this one for fitment (print it out 1:1, lay it over the manifold flange, align and rub your finger around it. You should see where the CAD is wrong. Just send me some photos and some measurements of where it is out and I'll amend it.

I have guessed at a 15mm difference in bolt hole location. I can't find it online but I'm sure thats what I've read at some point. Photos of gaskets look about right, maybe it's 12mm not 15.

I should note that my CAD flanges have a big area at the base to weld some triangular fins to support the runners. They aren't the same as a OEM flange. I'm assuming there is nothing to hit on the head like the earlier model but it would be worth checking that also. If it fits, I'll tidy it up before people use it.
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Old 02-17-2016, 10:33 PM   #927
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If I remember correctly, the bolt hole difference is closer to 10mm.

--Ferdi
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Old 02-18-2016, 12:44 AM   #928
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I've got a finished NA inlet flange for anyone crazy enough to want it.
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Old 02-18-2016, 12:51 PM   #929
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what about these?

Gatoperformance
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Old 02-18-2016, 02:08 PM   #930
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Just use the Honda idle valve on the plenum.
which Honda valve?
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Old 02-18-2016, 02:09 PM   #931
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Quote:
Originally Posted by Madjak View Post
Try this one for fitment (print it out 1:1, lay it over the manifold flange, align and rub your finger around it. You should see where the CAD is wrong. Just send me some photos and some measurements of where it is out and I'll amend it.
I no longer own a Miata, so somebody else is going to have to test them.

Also, I can't open these at work, but I suggest splitting the bolt holes to make it easier on his plasma cutter. Punching holes through the .5" plate I'll probably use will be pretty hard on equipment. One continuous cut is much easier on his gear.
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Old 02-18-2016, 02:26 PM   #932
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got mine in, hoping to see a difference between a stock TB and VIC manifold.
Attached Thumbnails
Honda intake manifold-img_20160206_111332_zpsi3cxrsoz.jpg  
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Old 02-18-2016, 03:00 PM   #933
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Glad you finally got that installed! Curious to see what it does too.
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Old 02-22-2016, 05:05 PM   #934
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Old 02-23-2016, 07:22 AM   #935
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Your backroad seems to be missing a dyno.
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Old 02-23-2016, 07:33 AM   #936
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Quote:
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Your backroad seems to be missing a dyno.


Dyno owner is on vacation right now and the one who did the welding has a car parked on his. Working on it...
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Old 02-26-2016, 02:16 PM   #937
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Originally Posted by emilio700 View Post
Fundamental intake manifold design stuff. Just like you might have to search for a few minutes to substantiate a theory that rod ratio of 1.45:1 might make less power than 1.58:1 in a Honda B series.

The reason so many people build ultra short runner BP manifolds is twofold:

1. They start with B series manifold designed for a longer rod ratio engine that makes power between 7000-9000rpm and either don't know the difference or don't care. Boost tends to hide just how bad your manifold design is.

2. It's easier to make it fit in the bay without the plenum hitting the shock tower.

Regardless of high you rev a BP on the stock crank, an OTS B series manifold will have a hard time matching the area under the curve and peak power of a square top. I have a pile of Honda B series/BP flanged manifolds here. Our best one just matched a squaretop and barely cleared the shock tower. It has runners that are too short.

The ideal BP manifold has runners the same length as OEM average, about 1-2mm larger ID depending on cams, plenum 10-15% larger volume and most of all, a straight shot from the TB flange into the plenum. I say average runner length because every OEM BP manifold has 4 different runner lengths to work around packaging constraints (EGR, hood clearance, production line assembly). Fixing that one problem is worth a few %, and fewer blown F/I builds running one o2 sensor.

To get the correct runner length and still fit in the engine bay means starting from scratch or looped runners, sort of like the BEGI prototype. Honda B series based manifolds will always be too short because of the curve of the runners. I know of only one non-looped manifold in existence that is correct. It is sheet & tubular aluminum with some cool carbon trumpets epoxied inside the plenum.
curious if anybody knows the runner length differences between the different BP manifolds? I've been using a heavily modified 95 manifold on a BP4W head. near as I can measure it seems runners 1-3 vary between 11 and 11.25" to the valve and 4 is more like 12" It appears the NB versions are longer but I don't have one to measure right now.

I was thinking of building another one based on a 95 manifold for Naturally aspirated and was wondering about adjusting runner lengths a bit when I modify the flange.

Motor will be stock internal NB2. Then mayby I should just run a stock VCTS manifold which seems to work well for mid range torque I think without much drop at the top.
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Old 02-26-2016, 02:19 PM   #938
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asmasm did a cast of his manifold. Don't remember the details.
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Old 02-26-2016, 02:33 PM   #939
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I haven't cast a manifold yet but I did cast an NB head port. I measure my squaretop runner lengths and got ~12". Its hard to get an exact measurement since you would need to take the center line of the bend. I also have 3.85" for the NB intake port length.
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Old 02-26-2016, 03:03 PM   #940
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Originally Posted by asmasm View Post
I haven't cast a manifold yet but I did cast an NB head port. I measure my squaretop runner lengths and got ~12". Its hard to get an exact measurement since you would need to take the center line of the bend. I also have 3.85" for the NB intake port length.
yea its real hard to get an exact measurement and with the NA manifold there is geometry that complicates defining the point where plenum volume becomes runner.

I'm contemplating cutting up an NB manifold to get the head flange portion and welding it to an NA manifold cut apart and ported reassembled and using the flange portion of the NB to add maybe an inch of runner length to make it closer to NB length. I like the cleanness of the NA manifold once you cut all the EGR features off and smooth it out. The square top has a bit bigger runner diameters but I think but I will have stock cams stock head and stock motor so I'm not sure that that will be a gain for anything other than very high RPM maybe peak power while I want area under the curve and mid range torque.
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