PTS Flowbench Forum

1960FL wrote:Please don't take this the wrong way as i am trying to give direction to your thoughts on the subject and expected outcome of your hard work and time relating to TQ & HP gains at the rear wheel. In today's performance world a cylinder head porters work is only as valuable as his data bank a person like Darin Morgan is so competent at what he does because of his history and the data he has to go with it. Not only flow data but every spec relating to the heads he has done and all the dyno and tune data to go with it. He has spent a lifetime in engine R&D and has that in his pocket, he can say if i do this i expect to see this on the dyno. Most of us here in the hobby world are lucky to have a flowbench and the time to tinker on some heads on the weekend in hope our beloved hot rod goes faster down the track, around the track etc. As tony said there is relay no known tangible data that relates X swirl with Y HP gain or tumble at that. You have to ask yourself how do i deal with each of the variables in the test scenario? pick swirls you have clockwise or counter clockwise? slow, medium or fast? you have diverging swirl, one that twists toward the piston or one that is flat at the combustion chamber. Where do you measure it? or do you build a fixture that allows the measurement of swirl at incremental points moving away from the deck until you reach the full stroke length away? what does any of this mean? and what is the end goal? better mixture propagation? better thermal balance in the chamber? I personally think these are all good ideas but unless you have a repeatable methodology and system that you can collect data at each point of a test, make changes, dyno, validate and repeat i am not sure your really getting anywhere. You need a single cylinder Mule engine on a small dyno and your flowbench with the above derived tools, methodologies and data logging to start to make any sense of what one might have done in making the air move a specific way. This is in no way like Porting for Flow where we can look at know data points for our application and at least know what to expect from our changes and when we have gone to far.

I admire you for your ambition but i might also suggest your knowledge may advance faster with the simple implementation of wet flow where you can see what changes you made in the system quickly and compare one cylinder to the next for consistency.

I look forward to following your progress, as for tumble one could easily make a seesaw type devise that uses calibrates springs and linear potentiometers for output then have the ability to be lifted in the bore and rotate 180° to sweep at incremental steps. For beginning calibration you could use a fixed orifice at distance x to the paddle as you increase air pressure your impact goes up and correlates to your output reading this could be a simple variable voltage.
output to arduino. Or a more simple approach is you make a similar apparatus that instead has a Pito Tube at each end and you record that data ??

Just my thoughts

Rick.