S54 Header Design talk

[Chrisyphus]

Thanks Digger, Youre a legend for that.

[Chrisyphus]

I was able to get it working earlier today. I created a fairly simple script that, for now, matches the pressure wave Digger supplied. Obviously, this is an extraordinarily simplified header model. It was just meant to be used as a test bed for the offset port timing profiles I was attempting to create. Now that this is working properly, the real work can begin in earnest.

https://youtu.be/ddSgvFQQno0?si=0FtAJe1d_l4C2upG

The really interesting thing that stands out to me is the banding that happens in the primaries under certian conditions- this is evidence of standing pressure waves, which I did not expect to see.


The low-pressure zone at the "collector," if you can call it that, is interesting as well. I think some extreme optimisation of the collector to create a venturi that has maximum effect on the other primaries could be interesting, as could some really innovative anti-reversion geometries, as 3stax has discussed.

As always, GIGO, so I will need to put a lot of effort into refining the animations and possibly even re-designing the profiles from the pressure-based model they are now to a velocity- or mass-based profile... not sure, at the moment, which will be best. Time will tell.

[3staxontheradio]

I started putting some stuff on github:

https://github.com/AlecMoody/AlecMoody_BMW

So far I uploaded the S54 head scan, CSL header scan, the current version of the pipemax configuration file, and scan of the exterior of the karbonius airbox.

[3staxontheradio]

Kromer Kraft headers to scan thanks to George Hill

[digger]

I started putting some stuff on github:

https://github.com/AlecMoody/AlecMoody_BMW

So far I uploaded the S54 head scan, CSL header scan, the current version of the pipemax configuration file, and scan of the exterior of the karbonius airbox.

what software will open these scans?

[0-60motorsports]

Kromer Kraft headers to scan thanks to George Hill

Awesome!

[Chrisyphus]

what software will open these scans?

Solidworks (can get a makers license for the SolidWorks Connected 3D Experience for makers for $48/year. make sure you do not get the browser-based version. It is trash and all but unusable), Fusion 360(free version, has most of the paid functionality), Meshmixer, Blender, and a ton of others. If you dont want to use one of those, just Google "CAD software that can open .OBJ or .STL file... I think there may also be a Windows native software that can open, but you really can't go wrong with the three I mentioned above. Personally, I recommend Solidworks. It has a steeper initial learning curve than Fusion360, but IMO, it is more capable for higher-level design.

For most people, whatever CAD suite they learn first is what they will always prefer. So I am biased towards SW, but back when I first started fumbling through CAD, I had both SW and F360, and found SW to be the better of the pair.

[digger]

i found a converter for obj to stl and can open stl

[3staxontheradio]

Assembled primaries and merges for the Kromer Kraft headers. Finishing up the scans for the other parts and getting some caliper measurements.

[0-60motorsports]

Assembled primaries and merges for the Kromer Kraft headers. Finishing up the scans for the other parts and getting some caliper measurements.

Wicked

[3staxontheradio]

Kromer Kraft scans are up on the github now. I measured out the diameters for the primaries and they looks like this:
Tubes are a little out of round so many measurements were taken and this is approximate:

Primary first step
OD 44.5mm
ID 41.5mm
Wall = 1.5mm (16 gauge)

Second Step
OD 47mm
Expected ID if 16 gauge: 44mm

Third step
OD 51.2
ID 48mm
Wall = 1.6mm (16 gauge)

I'll need to reverse engineer the primaries to get their lengths and where the steps are at.

[PurelliCondoms]

Looking amazing gents, I tried to call Kromer kraft a few time through the last year or so and I never got a response. Are they still in business?