Moderated Discussion Areas
ContinuousWave: Whaler Performance
|Author||Topic: Running WOT|
posted 09-23-2003 03:13 PM ET (US)
I was at the Whaler dealer today, dscussing the under performance of my motor.
I said I usually run at 4k-4200 rpm. His comment was that you could run at WOT all day long "those engines love to run"
I get the impression from reading this forum that running wot for long periods is detrimental.
posted 09-23-2003 03:16 PM ET (US)
p.s. motor is a 1999 150 Optimax
posted 09-23-2003 05:42 PM ET (US)
Any engine will last a lot longer before needing rebuilt if you keep your rpms no higher than about 70% of redline, as you are now, most of the time. It doesn't hurt to occasionally run it at WOT for a short distance, but the higher you run it, and the more you run it higher, the quicker it wears. Stay where you are on long runs.
posted 09-24-2003 02:22 PM ET (US)
An outboard will wear out 90% faster at WOT. You should run at 75% or less at cruise so say under 4500rpms. With a diesel you can run 90% but also the lower the nbetter. If you run WOT you would be lucky to get 300hours or so from an engine.....not to mention the fuel you are burning through.
posted 09-24-2003 07:27 PM ET (US)
Sounded like odd advice from a dealer, maybe he wants to sell more outboards
posted 09-24-2003 08:18 PM ET (US)
posted 09-24-2003 10:58 PM ET (US)
Used to have a YANMAR diesel. It was rated for continuous duty at 3,000 RPM. At 3,300 (WOT) it was rated for maximum of thirty minutes duty.
posted 09-28-2003 07:21 PM ET (US)
I again want to thank jimh for this site, and all you others for your knowledge and your generosity with same.
This thread reminded me of how I used to treat my Johnson Seahorse 6 hp when it was a kicker on my O'Day 23 sailboat.
I repowered with a 50 hp four stroke this past March, and probably would have treated it the same foolish way without discussions similar to this one in earlier topics. It's just one more example of how important this site is, and how much there always is to learn about boating, even when one has made the sea an important part of one's life for more than fifty years.
P.S. My "new" Yamaha motor now has 253 hours on it, and runs better than new.
posted 09-30-2003 03:24 PM ET (US)
Smaller engines are in a different ballpark. They are used on rental boats and seem to run forever with continuos abuse and WOT running. I have seen them go thousands of hours. One thing I can attribute it to is good things come in small packages I guess?
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