I was searching for a thread that has any information about flow testing all these porting that I see on this forum or any rotary forum, but can't seem to find any not even on google.

I'm just wondering how come this is not common on the rotary engine, I mean without some kind of flow test, any one can claim there porting is super good etcetc...

does anyone have any real data that there porting or port template works? flow test that show that the port actually increased flow.

I remember one time I found something about a flowbench for the 12a engine but can't seem to find it anymore.

 

A flow bench can tell the difference in flow but the numbers aren't comparable with other flow benches. What I mean is you would have to compare ports on the same bench. Also, porting templates are only part of what goes into a good port job. Most of the time spent porting goes into shaping the port bowl.

 

I know that you have to use the same flow bench to get a real estimate if you increased flow or not, but I wanted to know if anyone use one and does it require a special tool to flow test a rotary port.

 

is there any adapter so someone can just use a normal flowbench, to measure the flow of a port?

 

I made my own for exhaust ports. My old bench didn't have the room on top of it for a complete intake set up. I think to do it right you would need to have a way to simulate the rotor to port face interaction, like having a fixture to hold valves open at specific heights. Even better, having a way to test both intake ports for a rotor would be ideal.

My new bench has enough room for anything on top of it, when its done I'll be working on a fixture.

 

flow testing a port is partly a waste of time. It will help with bowl shape and the knife edge but only after the port is cut into the iron. Comparing one port to another doesnt really work, as a bigger port will (almost) always flow more. porting an engine shouldnt be all about who has the bigger port, the same thought process that goes into camshaft selection should apply.

the flow bench would be very usefull for balancing front and rear ports.