DIY bench with vac motors

[viper6383]

We are currently building a quick flowbench. I happened to have a bunch of 5.7" vac motors so we are installing 14 of them with variable speed controls and plan to employ the blow and suck modes. We plan to operate full digital only via a DAS and transducers

Our questions really come in with regards to the orfic plate transducer mounting options and test hole diameter and design. Are there any standards out there that should be followed? We are also very unsure as of the performance of the machine but each motor will pull 60in/h2o sealed and 112 cfm open air. We are just trying to see what has been done and what works really well for a digital type setup.

Has anyone built their own DAS without just buying someone's system? We are educated with the DA stuff but never applied it this this before. Any help is appreciated.

brandon

[Tony]

Test hole diameter would need to be at least as large as the largest bore engine you ever expect to be working on.

Your flow measurement system also needs to cover the expected range of flow measurement for whatever you plan to use your bench for. Being able to measure up to many hundreds of CFM accurately is one thing. Accurate Flow measurement through a small valve at 0.05" lift is quite a different problem. It is unlikely that one single orifice will cover the entire range.

Data acquisition software is not usually complex, but the time taken to write and debug something yourself can often make commercial software look like a real bargain.