thehelix112

Hmm.. i didn't have to jump through any hoops: Direct link: http://dl3u.savefile.com/f43d3ac330d2e8056c3bfd867a0bb750/Document.pdf Monzter, cheers for the close ups. So the flow is not in a vortex shape, its not tumbling over the ridges, and the valve is quite shrouded by the bore. I'll finish reading the Vizard article before I post any more naive questions. Dave

Also, can an admin please make this a sticky. Dave

Makes sense re swirl in the chamber during compression, and not turbulence in the port during intake. Feel kinda stupid for not getting that. Are you sure they won't create a tumbling block? It looks to me in your vids that the flow is in a vortex as it proceeds down the ports. That doesn't mean its not laminar I think, just that its not flowing straight down the port. Also, it would also seem important to keep in mind that the place where flow is most likely to become turbulent in the port I think is the inside edge of the turn. Too sharp a turn and the air will separate there. Did you do any work focussing on that bit? Also, any close up vids of the end of the port/valve during this flow? Would be very interesting to see. Many thanks, Dave

Legend. Thanks Monzter. Will have a read. I was thinking about this on my walk to work, maybe you could approximate it by taking the integral of the cam lift function, ie, the average area under the curve, ie, root mean square. This might at least get a somewhat approximate measure of how open the valves are if you consider them not moving. This is obviously a poor estimation, but perhaps better than just running them at full open which might be a tad optimistic. Quite right about it not producing the shockwaves, but perhaps you could run the tests at an RPM where the ram-effect of the shockwave reflections is minimal, and thereby minimuze the infidelity in the simulation? Of course, I guess this assumes that the shockwaves have no other effect, which is in itself a large oversight I'd guess. Dave

Monzter, I'm a little confused about the theory behind the streamliners. Do you have any references to articles/papers on this? The intake stream liners appear to be parallel to the ports? I don't understand how these will promote swirl, if I'm correct in thinking that swirl is essentially turbulent flow. It looks to me like they would be trying to make the flow `straighter'. Or is the flow following a vortex pattern down the runners (hard to see from the vids sorry), and so these ridges are effectively presenting an angled sheet to the flow, resulting in it `tripping' over the ridge and becoming more turbulent that way? The exhaust ones also puzzle me. I understand that the flow is in the opposite direction, which is why they have a smooth face and where the intake ones are sharper. Are you trying to split the flow around the top of the ridge and make it straighter as it flows outwards? Also, do the ridges form some minor function in reducing the restriction caused by the valve protrusion? Again, as its the most important questions, do you have any recommended articles/further reading on this? Many thanks, Dave

What globe said. Did you weld/fill up the plugs and redrill them? Dave

Mikeatpri, Probably something to do with the genius trying to start the car again. Dave

drmiller100, Can you please include an explanation to support your hypothesis? Simply restarting what you said last time isn't particularly helpful. Are you talking about the fact that with a strut suspension, the torque applied to the strut attempts to rotate the strut forwards (at the top), which (if the strut has castor), in some way attempt to lift the car? Are you talking about the fact that if the line from the castor rod is upwards towards the rear (from low point attaching to LCA to higher point attaching to chassis), then when the strut tries to compress this rod, there is a vertical component to the force it exerts on the chassis? (This is probably tripe that I just made up.) Or something else? I dunno about anyone else, but I have NFI what a bug's suspension looks like. Dave

Wow. Thats cool. Dave

Holy shitballs! Score!

Here is mine almost finished.

... I for one was confused about your first statement, (as after re-reading I think daeron was perhaps as well?) when you said `basic, bare bones' I assumed you were referring to the pic of the blue zed without a front, and essentially a square box hanging down. Also, get off your freaking high horse. Dave