Based on the head inlet area of 15.5cm^2 the throttle body needs to have a diameter of roughly 45mm, allowing for a 5mm shaft for the butterfly valve.


After several hours playing around trying to mesh the model, I gave up and dropped a dimension, as 2D runs a are much easier to build and run. Generally the numbers should be ignored, but the flow lines are usually pretty indicative.


But there is scope for setting up some runns with varying throttle opening, inlet pressures. Then can develop injector positions to get the best mixing arrangement.
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