Calculate power transmission efficiency accounting for gear mesh, bearing, churning, and seal losses per SAE J1540.
Input Parameters
Results
--
Output Power
hp
--
Efficiency
%
--
Heat Generated
BTU/hr
--
Primary Loss Source
Note: Manual transmissions are most efficient. Modern 10-speed automatics achieve 90-93% with lockup torque converters. CVTs improve with chain designs vs belt. SAE J1540 transmission efficiency testing.
Reference
Output Power = Input × Efficiency
Base Eff: Manual 96.5%, Auto 88%, DCT 95.5%, CVT 90%
Temp Factor: cold oil penalty, hot oil slight penalty
RPM Factor: slight loss at extremes
Heat (BTU/hr) = Loss (hp) × 2545