Below is the video we promised showing the design for a NASCAR tri-y header solution (left side). Download the file below which is 6.98 megabytes, but worth the wait. The video starts out with a random length secondary collector, random length primary collectors (2), and 4 random primary tubes initially made up of random bend lengths, bend radius. The blue dots are the exhaust port locations for an SB-2 racing cylinder head. The green dots on the outside of the box are space constraints for the design which turn red and move into final space constraints as the design converges. Objectives for the design are equal length primary tubes consisting of 1.75 inch tubing then stepping to 1.875 inch tubing, with primary merges and secondary merges. Note that the merge collectors are NOT rendered. This video represents about 4 hours of compute time on a 1ghz Pentium class machine. As you watch the video you'll note that the random primary tubes begin to grow towards their targets (the exhaust ports), then the primaries will gain perpendicularity towards the targets, and then the entire design will wiggle around until all the objectives are met for equal length tubes, fitting the packaging constraints, etc. For more on this exciting new technology, please read the technical papers below, or contact Spectrum5 Racing.
Download this file - you'll need Windows media player:
growrota.avi (Remember, this is 6.98 megabytes so we hope you either have patience or broadband internet access).