Discussion Starter · #21 ·
Yes, the overlap will be resolved, at the moment I have only drawn one of the trumpets, the software is duplicating it across the other holes, this means that I can still make changes to the profile and they will all be identical. To make the cuts I need to first make each trumpet into its own object which is one of the last stepsVery nice 👏.
Are you going to cut out the overlapping bell mouths? I would recommend to cut them at the touching. As they are symmetric they will form at the cut line exact the same shape, which makes it flow-wise much better. Just in case you do 3D print outs, on a single bell mouth fab approach, you would do that automatically.
How much volume to you provide for the plenum? The plenum volume is beside the shape of it the 3rd free parameter. You can design it via Helmholtz-resonance (cylinder displacement vs plenum volume) or do an 1D calculation method approach. In any case it is always power support vs. throttle response. If you don't race slalom races, where throttle response and control is most important, a rule of thumb would be around 2-4 Liter are ok for most applications. Maybe that helps.
The trumpets and the flange will all be printed together as one solid piece. This will be easier and more reliable than trying to join the trumpets to the flange afterwards.
The volume at the moment is the same as oem with the resonance chamber removed. Alot of the papers on intake volume are workarounds to having a restrictor fitted, but its easy enough to print some spacers to play with the volume and see what difference it makes
Next stage will be getting the last piece of the manifold scanned in which then opens up CFD fun for what its worth. I'm really curious to see what the flow distribution is like and whether there is room for improvement.