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ENGINE REVIEW:: O.S. 91HZ
PHOTOGRAPHS BY PETE HALL, ROB LANDRY AND KLAUS RONGE New pumped engine has more power and torque for 3D and FAI flying Note the lightened piston on the HZ shown on the right. The connecting rod is also lighter. The HZ (right) has a larger carb intake to accommodate the isolator block. A LARGER EXHAUST PORT AND RAISED EXHAUST TIMING PRODUCE MORE POWER AT A HIGHER RPM THAN THE PREVIOUS MODEL O.S. Engines is the...
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