So then an occasional 5k rpm isn't a problem. I've been saying that for a while now. More peak hp than torque at the flywheel still equates to more torque at the drive wheels. It's also in the gearing.
A boat motor and a pickup truck engine are both internal combustion engines. Your Merc 250 is designed to run 5-6k rpm continuously. The 5.7L Hemi, during R&R, was run at 5400 peak hp rpm full load for 300 hours. When torn down for inspection it showed only normal wear. Nothing melted or broke.
Are you implying the marine diesel unit will run forever?
