The velocity stacks (altering the inlet tract length) will have a significant bearing on the distribution of the torque (and consequently bhp), long ones will tend to move the torque down, shorter stacks move the torque up the rpm range and give the better headline BHP figure (if all else is matched correctly) it all depends on what you want from the engine, bottom end torque or top end power.....its a science on its own.
I’m using a set of adjustable ones at the moment so I can vary between the two, oddly when we did some testing (on the rolling road) the length of the stack didnt have a huge bearing on fuelling.
Once again you need to consider the inlet/exhaust/fuelling/cam/ignition as a balanced entity as all parts contribute to the whole.
I think I have a couple of sets of different stack lengths that you are more than welcome to borrow once you have got the fuelling right, but its really all down to time on a rolling road which isn’t cheap
I’m using a set of adjustable ones at the moment so I can vary between the two, oddly when we did some testing (on the rolling road) the length of the stack didnt have a huge bearing on fuelling.
Once again you need to consider the inlet/exhaust/fuelling/cam/ignition as a balanced entity as all parts contribute to the whole.
I think I have a couple of sets of different stack lengths that you are more than welcome to borrow once you have got the fuelling right, but its really all down to time on a rolling road which isn’t cheap
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