Fusion 360 and taking all the design recommendations from the Thomas Kamps book. Using recommended expansion angles, wheel clearances, and a correct number of wedges.
As for blade count in the current diffuser matching the compressor wheel. I've been informed this can create unnecessary resonance and noise, and potentially unstable combustion. But it's what came with the engine and there are some videos out there of this turd running and making some thrust. Although it has a small amount of external combustion in said video, and I've never seen one running correctly with nozzle.
I'm going to obtain an accurate p2 reading shortly by referencing immediately behind the diffuser here shortly and will post results.
2 psi P2 will mean poor comp efficiency and high turb temps .
Suggestion..............keep your starter power being applied until you have 5 psi of P2, this will mean you're well above selfsustain speed and will negate some of the inefficiencies as the comp will entering a higher efficiency area of its map .
Post by z28guysteve on Oct 8, 2021 23:31:48 GMT -5
I have tried every air source you can imagine, including a 50cc two stroke commercial leaf blower, sealed completely to the intake of the engine. The blower itself even produces 1.5 psi when you stick the reference hose to the gauge inside the duct. Even this powerful leaf blower will not get a significant amount of boost from this engine.