Flow Bench and dyno

[Sun here]

Hi to everyone,
I am in dilemma that out of flow bench and dynamometer, which of the two should be used for engine testing and Which one should be preferred and why? What will be the basic difference between their testing results ??
Can anybody please help me out !!!!!!

[Sun here]

Hi to everyone,
I am in dilemma that out of flow bench and dynamometer, which of the two should be used for engine testing and Which one should be preferred and why? What will be the basic difference between their testing results ??
Can anybody please help me out !!!!!!

[TorqueWrench]

Flow bench can be used to determine discharge coefficients for your ports (vs. lift) and throttle bodies (vs TP), which is normally required for an engine model if you are going to make one. It can also be used to determine pressure losses in the rest of the system under steady state conditions, which is part of correlating your engine model. As I said though, its only steady state and engines don't do steady state when running.

Engine dynos in my opinion are the most critical piece of equipment an engine team can have besides their powerplant. They are the only real way to correct an engine model properly, required to tune spark, make it easier to do a rough tune on fuel (final tune is almost always done by track testing that I have seen), and allow you to do most of the physical testing design judges want you to do. Engine dynos can test at both steady RPM or transient engine runs.

I have a flowbench and it is used several times a year. Flow testing the heads, evaluating porting improvements (although it only shows half the picture there), evaluating pressure drop across intake and exhaust manifolds, etc.

However, I would be using an engine dyno for months if I had one. Without a dyno, you cannot truly be confident in the accuracy of your simulations. Physical testing of runner lengths, cam changes, restrictor changes, etc.

I hate to throw this out there, but most stuff that you can do on a flow bench can be done in a CFD program fairly easily. I know that the accuracy cannot be confirmed without physical testing but if I had to choose between physical testing on a dyno to confirm my overall simulation or a flowbench to confirm my steady state CFD, I am going to choose the dyno every time.

If I didn't make it clear, I would choose the dyno if you have to pick one.

[Mikey Antonakakis]

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