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I found a calculator that figures cfm from orifice size and vacuum depression. It turns out vacuum and cfm times two is accurate. Vacuum per orifice size is not, which is fine. Thanks for the help.

Thank you for taking the time to confirm that there is a issue with the system. This was a design I came up with but I am not capable of proving or disproving it mathematically. What I did do was test the flow range on a cylinder head that I knew where the flow rates should fall. I believe it’s...

So if the vacuum correlates to half the orifice area given on the chart, where would that put the CFM?

You might be on to something here. Two of the test orifices I used are almost exactly have the area of other plotted points.https://files.engineering.com/getfile.aspx?folder=c4ed5d72-8564-4b02-896a-56df6c1de35e&file=20231FE0-55CC-4772-80E0-AA5965E5061D.jpeg

I’ll plot the depression for the seven test orifices on the chart. I assume you mean double the area of the orifice, and not double the diameter?

If I run only one pump and block off the other, the manometer reading matches the depression on the graph.

The calibration tests are being performed through a piece of lexan that has seven holes in it ranging from 0.25” - 2”. The test bore or largest orifice is 4” which will produce .84 w.c. I can confirm that there are no leaks in the system. Is there a “system curve” that I need to calculate...

Hello all, My question is about vacuum motors in parallel. I am using two of the same Ametek motors to power my home built flow bench that I am trying to use to measure airflow through a cylinder head. These motors come with a performance chart that I thought I could use to measure air flow in...

Inter cooling is part of the plan but I’m not positive what size I can fit. For now I’m estimating 40% efficiency. As far as internal motor parts go, I would like to stay as close to the original design intentions as possible or things get expensive fast and/or reliability goes to crap. There...

Thanks for the response. I have followed abut a dozen internet builds with these motors. The biggest issue is no one gives feed back after they are running. Based off of what I have seen, I should be ok up to about 10 psi. What I was hoping to look at was the heat produced by compressing the...

Hi guys, Im going to be turbo charging my ford 300 inline six motor this summer. Im trying to get a ROUGH estimate on how much boost I can safely run with a given compression ratio. Here is what I know: Stock compression is 8.8:1 DCR is 7.11 (173psi) If i bump my DCR up to 7.31 (180psi), I...