I have an engine running 3, 750 rpm at the A C engine pulley. This input rpm to the S C is fixed and doesn't change. There is no other engine pulley rpm. I can probably fit a 120mm pulley on the engine, and 70mm pulley on the supercharger unit to step up the RPM. The calculated impellor Show More...
I have an engine running 3, 750 rpm at the A C engine pulley. This input rpm to the S C is fixed and doesn't change. There is no other engine pulley rpm. I can probably fit a 120mm pulley on the engine, and 70mm pulley on the supercharger unit to step up the RPM. The calculated impellor speed depends on the internal step up gear ratio in the supercharger. Procharger is typically 4: 1 and Rotrex is 9: 1 Obviously I need a head unit that can deliver air in the slower rpm end of the compressor map, however the workload is also low. The engine is 540ci and runs a fixed 2718rpm producing a max of 245 HP at 6, 000FT at 10c. I want to maintain that HP to 14, 000FT. The rpm doesn't change. If we use 245HP as the maximum HP, and 23, 8"Hg @6000FT 10C as the maximum engine inlet air pressure, I need a pressure ratio at 14, 000FT of 23, 8 17, 7 = PR 1, 34. And at 10000FT I need 23, 8 20, 6 = PR 1, 16. Obviously I also have to spec out a blow off regulator system to dump excess air below 6, 000 FT. The engine needs a calculated 0.35kg s of air as per these calculations for this application.
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