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Old 09-12-2014, 09:20 PM   #1
Join Date: Jul 2014
Posts: 4
Default Slow RPM at flank speed???

Thanks to all that helped with my last issue. I replaced the impeller which was not broken but I thought I would 'cause it came in the kit. The real problem was the upper water pump seal. It was worn and allowing water to escape rather than sending up the water intake. It runs now at a stable 175 degrees F, less if I go fast.

One other question... It's been a cool and wet season so I've only had the boat out a couple of times. I did have an opportunity to do a speed run after the pump rebuild and the engine would only spin up to 4K RPM. Is this normal? I thought I remembered it running faster at flank speed. Again, it is a 2006, 2000 SR3, with a 5.0L normally aspirated stern drive Alpha. Any thoughts?


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Old 09-14-2014, 05:46 PM   #2
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Join Date: Feb 2012
Location: Perry Hall, Maryland
Posts: 6,128

Bill if over proped the engine will not hit the proper WOT, are you sure it did? Also how was the seas? If fighting strong currents and heavy load in the boat the performance will be impacted.

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Old 09-15-2014, 01:39 PM   #3

Join Date: Apr 2008
Posts: 3,975

I also assume the drive was trimmed out? You'll gain a few hundred rpm with a proper drive trim angle. You'll also loose a little with trim tabs in as well.
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