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Old 10-15-2011, 11:48 AM
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DIY flow bench

Has anyone ever tried making a flow bench? I am not too concerned about measuring actual CFM I just want to see if I am helping or hurting the head. I was thinking about maybe using a shop vac setup like this http://www.diyporting.com/flowbench.html
But instead of buying their metering system that is like $500 I would use a Mass air flow sensor and just use a multimeter to measure the amount of current going to it to keep the element heated just like an ecu does. Like I said all i care about is knowing if im helping or hurting idc about an exact cfm number. has anyone done this or maybe has some input that would help. Maybe ideas on piping and wiring and table design or if this is a waste of time and its not gonna be accurate enough to matter.

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Old 10-15-2011, 02:30 PM
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Here's a link to a PHR article on building a homemade flow bench from 1993. http://www.aces.edu/~parmega/articles/flowbench2/
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Old 10-15-2011, 04:13 PM
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Quote:
Originally Posted by zildjian4life218
Has anyone ever tried making a flow bench? I am not too concerned about measuring actual CFM I just want to see if I am helping or hurting the head. I was thinking about maybe using a shop vac setup like this http://www.diyporting.com/flowbench.html
But instead of buying their metering system that is like $500 I would use a Mass air flow sensor and just use a multimeter to measure the amount of current going to it to keep the element heated just like an ecu does. Like I said all i care about is knowing if im helping or hurting idc about an exact cfm number. has anyone done this or maybe has some input that would help. Maybe ideas on piping and wiring and table design or if this is a waste of time and its not gonna be accurate enough to matter.
Yep you sure can build your own. Mine follows the basic rules for the one that cal1320 references. There is more on the subject in David Vizard's book, How to Build & Modify Chevrolet Small-Block V-8 Cylinder Heads.

I built mine back in 1962 as part of my senior engineering project in flow dynamics when in school. It differs in the fans which are 3 forced air furnace fans that are individually switched.

There are tons of sensors and computer programs available to make one of these home builts as easy to use as the over the counter modern benches.

Bogie
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