Cheaper alternative
Posted: Wed Apr 10, 2013 6:22 pm
Hi Guys,
I'm new to the forum,and flow benchs as a whole.So please bear with me.I have studied automotive engineering in the early 80's,in S.Texas.Was a Heavy Wheel mechanic for Uncle Sam,and have worked several jobs in Europe in different mechanical fields.Completed further training in the field of industrial electronics in Germany,and am currently working for an electronic D&D company in Germany.I'm not an engineer by any means,but I do have a firm understanding of things.Jack of All Trades, and Master at None.
I'm currently getting ready to port some old chevy heads.I was thinking about building a flow bench for some before and after comparisons.I don't need anything fancy,only something to mark improvements.
I want to take a Karcher shop vac., and hook it via some plastic pipe to a flow plate with the head mounted.In the pipe will be a Vaccum gauge that measures down to -1 bar.I don't know how much vacuum the Karcher actually pulls,but should it peg the vacuum gauge,I could add an adjustable vent to the pipe.With this I could get the vacuum guage to hover at any where on the dial.Theoreticly, if I was to "set" the vacuum gauge with the vent,to say -0.8 bar, I should see a drop in vacuum as I open the intake valve.I would basicly be checking the drop in vacuum at each lift.Granted I won't know exactly how much is actually flowing in CFM,but I could see before and after differences in the vacuum readings.Depending on how precise a gauge I use I would also see minut differences between ports.
Some more thoughts are ,when set to -0.8 bar ,the vacuum becomes a set value.The tubing volume also represents a set value.
To open a valve in the head to .050 lift, and see the vacuum drop to -0.6 bar for instance, thats a drop of 0.2 bar. There must be a way to use this 0.2 bar vacuum drop ,in relation to the tubing volume,and figure how much air is now flowing.Or not?
I'm new to the forum,and flow benchs as a whole.So please bear with me.I have studied automotive engineering in the early 80's,in S.Texas.Was a Heavy Wheel mechanic for Uncle Sam,and have worked several jobs in Europe in different mechanical fields.Completed further training in the field of industrial electronics in Germany,and am currently working for an electronic D&D company in Germany.I'm not an engineer by any means,but I do have a firm understanding of things.Jack of All Trades, and Master at None.
I'm currently getting ready to port some old chevy heads.I was thinking about building a flow bench for some before and after comparisons.I don't need anything fancy,only something to mark improvements.
I want to take a Karcher shop vac., and hook it via some plastic pipe to a flow plate with the head mounted.In the pipe will be a Vaccum gauge that measures down to -1 bar.I don't know how much vacuum the Karcher actually pulls,but should it peg the vacuum gauge,I could add an adjustable vent to the pipe.With this I could get the vacuum guage to hover at any where on the dial.Theoreticly, if I was to "set" the vacuum gauge with the vent,to say -0.8 bar, I should see a drop in vacuum as I open the intake valve.I would basicly be checking the drop in vacuum at each lift.Granted I won't know exactly how much is actually flowing in CFM,but I could see before and after differences in the vacuum readings.Depending on how precise a gauge I use I would also see minut differences between ports.
Some more thoughts are ,when set to -0.8 bar ,the vacuum becomes a set value.The tubing volume also represents a set value.
To open a valve in the head to .050 lift, and see the vacuum drop to -0.6 bar for instance, thats a drop of 0.2 bar. There must be a way to use this 0.2 bar vacuum drop ,in relation to the tubing volume,and figure how much air is now flowing.Or not?