Pe.
Thank you for carrying out these tests and providing these graphs. They make some interesting reading.
The MVVS 3204 canister displays a remarkable flat power curve, smack on 5 Hp throughout from 5600-7400 rpm. Never seen anything like it.
I get 6240 rpm with a 24x10 MenzS on the 58 Prosport, which according to your prop/power calculator translates to 5,70 Hp. This is with the MVVS 3204 Can. I also get very similar revs. with the same propeller and a MTW-TD110K. Interestingly, this is exactly the revs where the power curves for the two different cans cross each other. (Although you tested the TD-75K)
Comparing this to the MTW-T2 at 400mm header length, you are showing a whopping power increase of more than 40% (@7000 rpm).
Dick Hanson stated above:
basically - the best -smooth running setup (nice even midrange ) -is your goal
To do that - you will NEVER get peak power- but you will get a few hundred rpm increase on typical props for that engine (which is a LOT of power increase)
During your tests, did you get a feel for how the midrange, and general "throttleability" is for the engine with the T2 pipe @ 7000 rpm?
Also, you have a measurement at 7100 rpm, which propeller was this with?
Kind regards,
Magne