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Cam and I built one of these David Vizard budget flow benches

Smorgesborg said:
I'd also like to say, for the record, that it took about 90 minutes to get the water back in at the appropriate level. For anybody wanting to recreate this I recommend using a MAP sensor and an arduino with an LED screen instead to avoid water evaporation.

Edit; referring to flow bench.
Click to expand...

or don't use water ;-)
 
We've digitized it:

P7SIX8Jl.jpg


Just a baseline has been done so far. It needs a little orifice to slow down the changes in reading but other than that works pretty well.
 
I've got a 90+ and one of the old garrett manifolds sitting on a shelf that I'd donate to the cause, but I'm down in Maryland. I'm game to meet somewhere along the way for a baton pass if you're making a trip south anytime soon. I imagine shipping would be pricey.
 

High Flow, Low Cost, 8V Cylinder Head Project - Rennlist - Porsche Discussion Forums

944 Turbo and Turbo-S Forum - High Flow, Low Cost, 8V Cylinder Head Project - I have been doing research for quite some time now on a high flow, low cost 951 cylinder solution. LR sell a stage III head that flows great but $1,619 with a core was quite a bit more than I wanted to spend. Nize did...
rennlist.com
Posting this in here for posterity
 
culberro said:
If only there were cheap differential pressure sensors that could read in-h2o....

https://www.amazon.com/Professional-Manometer-Backlight-Differential-Ventilation/dp/B078YDFX4R/ref=sr_1_4?crid=1NZZXXDFX777G&keywords=differential+pressure+sensor+hvac&qid=1666107313&sprefix=differential+pressure+sensor+hvac,aps,145&sr=8-4&th=1

https://www.amazon.com/Handheld-Manometer-Professional-Differential-Dual-Port/dp/B09MRZMJ67/ref=sr_1_20?crid=1NZZXXDFX777G&keywords=differential+pressure+sensor+hvac&qid=1666107313&sprefix=differential+pressure+sensor+hvac,aps,145&sr=8-20
Click to expand...

Don't get sucked in (pun entirely intended) to believing that because something is digital, that it is more accurate. The specifications for those meters suggest that they have an accuracy of about +/- 4mm of H2O. So the digital option is certainly more convenient, but it is very easy to read a water column manometer to better than 4mm.
On my bench, testing a standard 531 head with readings corrected to 28"H2O, a 4mm manometer difference would equate to about 3 CFM, more when you consider I am using two manometers.
 
crogthomas said:
Don't get sucked in (pun entirely intended) to believing that because something is digital, that it is more accurate. The specifications for those meters suggest that they have an accuracy of about +/- 4mm of H2O. So the digital option is certainly more convenient, but it is very easy to read a water column manometer to better than 4mm.
On my bench, testing a standard 531 head with readings corrected to 28"H2O, a 4mm manometer difference would equate to about 3 CFM, more when you consider I am using two manometers.
Click to expand...

The advantage to the water column is that the weight of the water dampens the fluctuations in measurement, making it easier to read. As anything, compromise.

Again, we don't take these numbers as gospel and nor should you. It's just Cam and my knuckle-dragger effort at "better" or "worse".
 
I just have an overall flow number for the head with the intake manifold. A 28" with .5" lift the intake flow went from 203.4 cfm to 187.1 cfm. So the intake manifold has a good bit of restriction.
 
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