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| just read thru this thread ,and being a certified outboard mechanic,I would hope you guys who are running your motors wot for extended periods of time know the damage that can be done.Case in point you don't drive your car pedal to the floor a motor is a motor after all. |
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Posts: 7068
Location: Northwest Chicago Burbs | Guest,
How long is too long to run at WOT? Motors exploding freaks me out constantly!!! |
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| that's why I have the 6 yr warranty! drive em like ya stole em...
ok maybe not but running a boat WOT for a few minutes here and there isn't going to make them blow up.... hahhahhahaa |
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Posts: 7068
Location: Northwest Chicago Burbs | bn - 6/29/2007 9:43 AM
that's why I have the 6 yr warranty! drive em like ya stole em...
ok maybe not but running a boat WOT for a few minutes here and there isn't going to make them blow up.... hahhahhahaa
Is it POSSIBLE your: my 2000 175 EFI might be going to the outboard junk yard....MIGHT be a symptom of driving it like you stole it?
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| yah maybe....or maybe the guys that owned it before me....I wasn't overly hard on the motor....our lakes are only a couple miles across so it was never WOT for more than a few minutes...
what's the point of having a boat that can do 55 if your motor can't handle it?
seems race cars are driven WOT for hours on end and do just fine...
maybe I need a race car engine on the back....
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Posts: 13688
Location: minocqua, wi. | you guys gotta be kidding me! ... i've run and will continue to run my yami 2-stroker wot without concern. no different than a good 2-stroke sled ... 5200 rpms at cruise trimmed up ...
so you can run 75% of a motor or you'll blow it up? gimme a break |
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Location: Green Bay, WI | I do NOT believe this "guest" who claims to be a mechanic.
If the manufacturer of an outboard engine (water-cooled, I might add) advises that the maximum safe operating range is 5500-6400 RPM, for example, then you should be able to run it to 6400 without difficulty. If we were talking about air-cooled engines like an aircraft engine, then that might be another story--simply due to improper cooling. But the engine guys that work on my Verado implore me to run it near WOT...which by the way is only about 6200 RPM on my boat.
These engines are designed and built to run within the specifications established by the manufacturer. So as long as you have adequate cooling (easily verifiable by a water pressure gauge), you are good to go--according to everyone I have spoken to. And besides; most of the time the engine is propped in such a way that you won't be able to even *reach* the top of the power range at WOT.
Here's another way of looking at it... If you look at the power curve of a Honda 200, it is rated to make 200 horsepower at 5500 RPM; however the operating range is 5000-6000 RPM. When I ran one the thing was propped so that it would only turn about 5750 at WOT--simply because there wasn't a prop in the size I needed to get the little extra to get to 6000 RPM. But when I talked to the Honda rep he told me not to worry about it as that particular model engine didn't make much additional power until it went well over 6000 RPM--in other words, outside of the normal operating range specified by Honda; a range where you would never want to run it.
Now contrast this with the Honda 225. Even though it makes its max 225hp turning 5500 RPM, that engine's power curve shows that it continues to make more horsepower all the way up through 6000 RPM. So it should be obvious that a guy would want to turn that engine as close to 6000 RPM as possible. Indeed, the Honda rep (Pete Sullivan, as I recall) confirmed this to me.
Do not confuse WOT with maximum *POSSIBLE* RPM...the two are not the same. I would check the owners manual, but if there aren't any restrictions imposed by the manufacturer in terms of maximum power settings for certain time periods (there aren't for my Verado, after the first 10 hours of use), then run it WOT.
TB |
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Posts: 13688
Location: minocqua, wi. | been running and racing high-performance two-stroke race sleds for over 20 years and as long as you have fuel/oil delivery and exhaust systems that are set up properly you can run the dog out of them ... and these outboards are essentially "de-tuned" and run fat from the factory to protect from warranty claims so there's even more you can get out of them "safely" if you ever wanted to ... anybody saying you can't run the full range top and bottom of a 2-stroke doesn't know much or hasn't held the throttle very long.
if motors blow, there is a "flaw" ... either fuel/oil delivery, cooling or exhaust ... plain and simple
the old opti's had a cooling issue with the way it was engineered ... i got to pay for 2 of them in a row back in the day ... there are surely other "flawed" either motors or designs but thinking that you have to "protect" your motor would really suck ... i like to use the stuff i pay a lot for.
Edited by jonnysled 6/29/2007 10:56 AM
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Location: Green Bay, WI | Amen good brother, amen...
TB |
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