Forum Discussion
Hannibal
Sep 04, 2009Explorer
Almost forgot. Chrysler, during R&D, ran the 5.7L Hemi 300 hours at peak hp rpm under full load. Nothing melted or broke and upon teardown, it showed only normal wear. Far more brutal a test than anything I've done to it in the past 113k miles. Cummins also runs their engines at peak hp rpm full load for hundreds of hours. Rpm hurts nothing but cringe factor in those with rpm a phobia. My '98 12v 5spd 4.10 with it's 28.5" diameter tires ran 2500rpm at 70mph in top gear. The only thing it hurt for the 94k miles I had it was my ears. I wrote to Cummins to inquire about running against the governor most of it's life and if it would shorten the Cummins life. They replied that the wear would be negligible.
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