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The tension of the connecting rod exceeds the design standard of Bare Engine

2025-06-10

The force of the connecting rod is directly related to the speed of the Isuzu Engine. Generally, the design safety speed of small four-stroke general-purpose Bare Engine does not exceed 4000 rpm.

Below 4000 rpm, the loads borne by Isuzu Engine parts are within the acceptable range. When the Isuzu Engine is overspeeding, these loads increase significantly. For every 500 rpm increase in speed, the force borne by both ends of the connecting rod will increase by 44%.

When overspeeding, the connecting rod will break at the weak point (that is, about 2.5 cm away from the piston pin). We usually see that the connecting rod is broken in many sections.

In addition, the position of the speed limit screw, the speed control crank and the speed control gear can also help us determine whether the position of the speed control screw has changed, whether the clamping bolt of the speed control crank is loose, and whether the speed control gear is off or damaged.

When each Isuzu Engine leaves the factory, the high speed will be set according to different application requirements. Do not increase the speed of the Isuzu Engine at will without a tachometer.

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