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Dave R · 07-21-2006, 10:06 AM

Stress on the engine increases with the square of engine speed so running it at 5000 RPM creats 4 times the stress as 2500 RPM. I tend to stay under 3200 RPM with my engine as I've heard they last a long time that way.

The amount of hours on an engine are vastly less important than the condition of the engine. Passing a compression (or better yet a leak down) test and proven reliability are better indicators of the engine's expected performance and longevity.

07-21-2006, 10:06 AM	#17
Dave R Senior Member Join Date: Jul 2004 Posts: 2,984 Thanks: 246 Thanked 743 Times in 443 Posts	Stress on the engine increases with the square of engine speed so running it at 5000 RPM creats 4 times the stress as 2500 RPM. I tend to stay under 3200 RPM with my engine as I've heard they last a long time that way. The amount of hours on an engine are vastly less important than the condition of the engine. Passing a compression (or better yet a leak down) test and proven reliability are better indicators of the engine's expected performance and longevity.