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No. Blow by means that compression is leaking past the rings into the crankcase. Other than burning oil and fouling the motor with exhaust and carbon, reduced power is the biggest result of blow by.

A thrown rod means that the connecting rod has broken off and is swinging freely around inside the motor.

A thrown rod is usually caused when the rod bearing seizes. Because the rod cannot rotate around the crank, the rod breaks off. This is a lubrication issue caused by low or no oil pressure.

A thrown rod can also be caused if water or other uncompressable fluids are swallowed into the motor. This will bend the connecting rod leading to breakage.

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Q: Would blow by cause engine to throw a rod?
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