Expiremental OM617 build
Expiremental OM617 build
![[Image: manifold%20complete%201_zpsorkoeclf.png]](http://i346.photobucket.com/albums/p435/R-3350/manifold%20complete%201_zpsorkoeclf.png)
" />the core of the manifold is a bar of 6061-T6 16" X 2.5" X 1.25" with a series of bell-mouths into the runners. this is the only part that needs special construction and you could probably get around that with ebay velocity stacks, some plate aluminum, and a tig welder.[img]<a href=[/img]
![[Image: manifold%20bellmouth%201_zpspujvofq0.png]](http://i346.photobucket.com/albums/p435/R-3350/manifold%20bellmouth%201_zpspujvofq0.png)
" />i wont be building this manifold for a bit yet as i just got the w115 manifold on. however sometime in the future ill get around to it. once i finish modeling the airflow dynamics and have a good set of .DXF files i will post them somewhere for anyone who wants them. in other news i am waiting for the last parts to get the down-pipe together and some charge piping before i can get the 300D back on the road. i briefly ran it with nothing from the turbo back and its ridiculous. you can't make out the engine tone over the turbo whine above 3K rpm free revving it. i re-clocked it some after this picture to better situate the outlet and the oil drain.
[img]<a href=[/img]
![[Image: IMG_20160810_090110_zpseodzftvt.jpg]](http://i346.photobucket.com/albums/p435/R-3350/IMG_20160810_090110_zpseodzftvt.jpg)
" />here's how i adapted the drain line to the block not elegant but it works.[img]<a href=[/img]
![[Image: IMG_20160809_141749_zpsilvp7xxl.jpg]](http://i346.photobucket.com/albums/p435/R-3350/IMG_20160809_141749_zpsilvp7xxl.jpg)
" />
i have been experimenting lately with designing a resonant tuned intake manifold styled after the w115 manifold but with better flow characteristics. the first step was to establish the resonant frequency of the valve acoustics at desired RPM. i chose to model the intake for 2800-3100 and 4000-4500 as two of the primary tuned harmonics. this should establish better airflow at cruse rpm (~3000 for me) and maximum HP which stock is 4350 but i figure i should be able to push that up to around 4500 with some governor tweaks. modeling the intake is two method approach as i am trying to figure out the Helmholtz resonance of the plenum as one volume and the runner resonance as another. so far i have established an ideal runner length of 18.91" (480.3mm) and a cross sectional area of 1.39"^2 (9.02cm^2). this is all rough estimation, however even if it is a bit off the 3rd and 4th order harmonics i am targeting should fall somewhere in the usable power band. based on these dimensions i started designing a manifold with the main goal being ease of construction and optimal air flow. i have access to a CNC mill so i intend to use it for one part of the manifold however most of it is basic aluminum sheet and tube stock.[img]<a href=[/img]" />
the core of the manifold is a bar of 6061-T6 16" X 2.5" X 1.25" with a series of bell-mouths into the runners. this is the only part that needs special construction and you could probably get around that with ebay velocity stacks, some plate aluminum, and a tig welder.[img]<a href=[/img]" />
i wont be building this manifold for a bit yet as i just got the w115 manifold on. however sometime in the future ill get around to it. once i finish modeling the airflow dynamics and have a good set of .DXF files i will post them somewhere for anyone who wants them. in other news i am waiting for the last parts to get the down-pipe together and some charge piping before i can get the 300D back on the road. i briefly ran it with nothing from the turbo back and its ridiculous. you can't make out the engine tone over the turbo whine above 3K rpm free revving it. i re-clocked it some after this picture to better situate the outlet and the oil drain.
[img]<a href=[/img]" />
here's how i adapted the drain line to the block not elegant but it works.[img]<a href=[/img]" />
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