 
Flow Simulation Results for the new manifold design.
Driver Front: 279.3 cfm
Driver Center: 284.7 cfm
Driver Rear: 281.5 cfm
Passenger Front: 284.4 cfm
Passenger Center: 286.5 cfm
Passenger Rear: 285.7 cfm
Maximum deviation between any two cylinders: 7.2 cfm, 2.6%. Mike Smith manifolds:
Driver Front: 241.6 cfm
Driver Center: 237.1 cfm
Driver Rear: 238.6 cfm
Passenger Front: 219.1 cfm
Passener Center: 231.1 cfm
Passenger Rear: 228.1 cfm
Maximum deviation between any two cylinders: 19.5cfm, 7.2%. Total average flow of AshSPEC manifolds: 283.7 cfm
Total average flow of MS manifolds: 232.6 cfm
Percentage gain in flow of AshSPEC manifolds: 22% I'm having these badboys 3d printed this weekend and will be taking them to a Superflow 600 flowbench that I tested the MS manifolds on so we can get an actual flow test. It will be interesting to see how close the flow simulation software is to the real world.
In the mean time while waiting for the prints, here's the direction I'm going now:
Stock Intake Manifold modeled for flow simulation comparison.
 This will be used as a comparison basis to compare to the new design using transient airflow modeling; i.e. the pressure differential will change at the lower plenum ports to simulate the actual flow of air through the manifold while it is in operation on the engine, moving from runner 1 through 6 and over and over again to analyze the flow trajectories, pressure waves, and velocities. The time base will also be altered to simulate various engine RPMs over 500 RPM intervals. This will serve well as a validation of the flow simulation since we already know that the factory intake manifold's hemholtz resonance is through the 4500RPM band so I expect to see this tunnel ram effect in the simulation and increased massflow into the lower ports. This should also be a good exercise in solidworks as well as seeing intake pulse dynamics for myself - should be a good bit of fun to set this all up and see the results. Video of transient flow simulation in stock manifold is on my FB page: (It is public but you do have to have a FB account to view it)
https://www.facebook.com/ash.spec Video picture:
 (please keep in mind that this model needs further refinement as well. I need to cut apart a plenum so I can accurately model the inner walls of the part) I'll be picking up the 3d prints of the exhaust manifolds this weekend and flowtesting them next week. If all is well then I am already setup with a foundry to have tooling made, samples reviewed and then final parts cast and machined.
Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the
tailor.
Albert Einstein
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