Re: WOT, how long is too long to keep 'er pinned?
Good examples there. Lawn mowers are run full throttle their whole lives and are mistreated by 99% of all owner's. They are lugged(mowing tall grass to fast) often and operate in very warm weather. Not many people EVER change the oil in them either.
Your lawn mower has an RPM Governor in it.
Push the lever to the "Rabbit and you get a preset RPM.
It is well below WOT!
When you hit the tall grass, the throttle opens up to increase power, but the RPMs stay the same.
Push on that long skinny spring by the Carb on your lawn mower and you will hear what WOT sounds like.
It WILL Scream!
Chain saws and weed whackers are constantly returning to idle.
If it takes you more than 5 minutes at WOT to cut through a tree, you need a bigger saw!
Dig into the Boat Engines Manufacturers recommendations and you will find 70% throttle recommended for extended use with five minutes at WOT allowed occasionally.