...BTW your Bieber avatar is awesome.-Malone
That is nicely modelled, with the CFD, did you simply put the airflow onto the inlet and let it work itself out regarding the passing over the fins or did you stipulate that the air had to flow equally over the fins?I only ask because if you simply told the system that there was an airflow at the inlet on both then it proves categorically that the fins are required.Cheersnathan
There is quite a bit on this that I didn't write about, like that radius, as I really don't know about it. BUT the machinist with the flow bench does. That is a Dual plenum design mine will be single. I don't know if the pipe will be tapered or not to feed. My machinist with the flow bench is getting back to me on that, but he seems to think with the sausage funnels in the middle of the pipe it will not be as big of a deal as the air will have to turn to head down. Also, the intake valves close, which changes flow and is the reason for the specific length runners. He has a neat little thing that he can shoot die into the air and watch it with camera to see what it is doing. Like I said, I am a "wanna be" intake builder not a real one, but with the info I have I will have an intake that will provide better air than stock.The biggest deal with performance from what the machinist tells me is Velocity. Flow is OK, but if you can get the air moving really fast into the cylinder to fill it, when the piston starts up, the cylinder will still be filling with air. IF you have good velocity with the incoming air charge. To open the head ports bigger is not a good goal, but shaping them so the air doesn't slow down or have to turn much is great. That is the idea with this intake, the air will only turn 2 times Also, the .8L displacement of the plenum is 1/2 the engine volume. From his many times around the intake making he has found that 1/2 the engine displacement will give the best throttle response with almost no negative affect to high rpm flow...especially on a small diesel that doesn't rev to 8,000rpm. Larger creates more "lag" and smaller it will starve the engine on the higher RPMs. I will have it done sometime, but I maybe running the engine with the stock intake for a bit. Since you have that flow program, do you know what length the runner should end up. My machinist hasn't told me yet, but said he thought it was 9" from another he built before...there is a harmonic in the air flow and I am trying to find it for more low RPM. The gasser intakes and the D24 runners measure pretty much exactly 8" at the centerline, but I am not going to be running as much rpm and want more bottom end. If you know that would be great