Blower Sizing Review An example is provided for an 8,000 RPM Roots blower speed.  That would be for a blower drive ratio at 1-to-1 on an engine spinning 8,000 RPM.  It could also be for a blower overdrive ratio at 1.333-to-1 or 33.3% over for an engine spinning at 6,000 RPM.  The 6-71 Roots […]