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Author Topic:   Running WOT
prxmid posted 09-23-2003 03:13 PM ET (US)   Profile for prxmid   Send Email to prxmid  
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.

prxmid posted 09-23-2003 03:16 PM ET (US)     Profile for prxmid  Send Email to prxmid     
p.s. motor is a 1999 150 Optimax
Moe posted 09-23-2003 05:42 PM ET (US)     Profile for Moe  Send Email to Moe     
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.


Bigshot posted 09-24-2003 02:22 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
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.
prxmid posted 09-24-2003 07:27 PM ET (US)     Profile for prxmid  Send Email to prxmid     
Sounded like odd advice from a dealer, maybe he wants to sell more outboards
Moe posted 09-24-2003 08:18 PM ET (US)     Profile for Moe  Send Email to Moe     
jimh posted 09-24-2003 10:58 PM ET (US)     Profile for jimh  Send Email to jimh     
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.
elaelap posted 09-28-2003 07:21 PM ET (US)     Profile for elaelap  Send Email to elaelap     
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.
It was either idle at neutral or WOT in forward or reverse to move my heavy old fixed-keel beauty. I didn't even think of doing things any other way. Luckily, I only used the motor when I couldn't comfortably dock without it...maybe a total of 20 or 30 hours in ten years [this is a wild, not-well-thought-out estimate, but might be in the ballpark]. The Seahorse is now a kicker on my 16/17, and doing just fact it's now only started every third or fourth trip and used for fifteen minutes or so, at mid-speed, just to keep everything lubed and functioning. I troll with my main outboard...the kicker's just for emergencies.

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.

Bigshot posted 09-30-2003 03:24 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
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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