Another question about WOT

[18rabbit]

My dumb question for 2004: What exactly is meant by WOT? And where is its practical value?<br /><br />I have seen the term used for performance evaluations and mechanical specifications, but my understanding is that actual maximum achievable RPM’s is not useful because it cannot/should not be sustained unless the engine be damaged.<br /><br />I know what high idle RPM is – max RPM without a load on the engine.<br />I know what full load RPM is – max RPM when the engine is under load.<br /><br />Is either of these what is meant by wide-open throttle? Neither of them is necessarily representative of a throttle that is wide open.

 

[ufm82]

Re: Another question about WOT

WOT- or Wide Open Throttle- is the term referencing the maximum RPM you can achieve while on the water with a load. This number changes drastically depending on conditions- prop, trim, drag, weight of the boat, etc. Take the boat out and run it with the throttle in the fully advanced position. That gives you the WOT for that particular event. <br /><br /> Engine manufacturers set RPM ranges so you can operate your boat within a range that is safe. With proper set-up and operating conditions, the range stated will allow you to run your engine without fear of damaging it. WOT does not take the number into account. <br /><br /> For example. My boat's recomended RPM range is 5400-5800. When I first got the boat, it would achieve 6100 rpm at WOT. I was underpropped for what I was doing. The previous owner did nothing but ski- he had a lower pitch prop on the boat for holeshot and quicker low speed response. I do not ski and wanted speed. I had to increase the pitch of the prop to get the rpm's down to where they needed to be. The WOT of 6100 never bothered the previous owner- he never ran the engine that fast as he was pulling a skier, not blasting down the river. Had I not changed the prop, the engine could have overevved every time I went out, thus shortening its life. <br /><br />WOT only refers to the actual RPM you can get under any given circumstances. <br /><br />UFM82

 

[Bondo]

Re: Another question about WOT

I know what full load RPM is – max RPM when the engine is under load.

The the Boating World,<br />This Is WOT..........<br /> "Neither of them is necessarily representative of a throttle that is wide open. " <br />It IS in a Boat......<br /><br /> "I know what high idle RPM is – max RPM without a load on the engine." <br />In an I/O, This is determined by Valve Float......<br /><br /> "I have seen the term used for performance evaluations and mechanical specifications, but my understanding is that actual maximum achievable RPM’s is not useful because it cannot/should not be sustained unless the engine be damaged." <br />This is True of I/O engines......<br /><br />2-stroker, Outboards can run WOT, All Day Long.......