Author Topic: Is it bad for motor to run at 5300-5500 rpm for long distances?  (Read 492 times)

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Online Fisherdv

Is it bad for motor to run at 5300-5500 rpm for long distances?
« on: October 23, 2017, 02:49:35 PM »
Is it ok to run at 5300-5500 rpm sustained, for long distances? Motor is a new Honda 60 4 stroke. Max WOT rpm rating is 6000 rpm. Sometimes I gotta run a bit of a distance. I know gas mileage will suffer a bit but was just wondering in general if those sustained rpms are bad for the motor?
« Last Edit: October 23, 2017, 02:52:48 PM by Fisherdv »
2018, Sea Chaser 16, Honda 60HP

Offline Threeweight

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #1 on: October 23, 2017, 03:22:35 PM »
Nope, high RPM's won't hurt anything but you wallet on the fuel bill.

It is actually good for the motor.  Full operating temperature will cook off any water vapor/fuel in the crank case, and high RPM's at heat will help keep carbon from building up in the cylinder walls.

People think they are "babying" a motor by never running it above 4000 RPM.  The opposite is true.  Every time you run the boat, at least a few minutes of higher RPM running is a good thing.
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Offline J Chaser

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #2 on: October 23, 2017, 03:31:00 PM »
I regularly run 5000 plus. My WOT is 6300.

550 hours on the motor no issues.

J.
Sea Chaser 1511, Yamaha F70, Yamaha F6 kicker

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #3 on: October 23, 2017, 03:32:04 PM »
If I troll a lot I always run for about 5-10 minutes close to WOT, to as you said, burn off any unburned fuel and carbon build up. I just wasn’t sure if WOT or close to it was ok for extended periods like 30 min. or longer, straight.
2018, Sea Chaser 16, Honda 60HP

Offline J Chaser

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #4 on: October 23, 2017, 03:42:40 PM »
I run 45 minutes each way to my fishing spots locally.

J.
Sea Chaser 1511, Yamaha F70, Yamaha F6 kicker

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #5 on: October 23, 2017, 03:51:18 PM »
Thanks guys.
2018, Sea Chaser 16, Honda 60HP

Offline ATGEP

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #6 on: October 23, 2017, 06:58:10 PM »
4+K RPMs continuous is what the motors are designed for. Lots of former race tech in these things including dry oil sumps and sold lifter tappets.

Offline Threeweight

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #7 on: October 23, 2017, 07:22:49 PM »
I tend to think of outboards as having more in common with motorcycles than old v8 car engines.  They are designed to produce their peak power at the top of their RPM range, and have rev limiter to prevent you from damaging the engine.

Modern car engines are the same way. 
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #8 on: October 23, 2017, 08:06:00 PM »
Is it acceptable to run FULL WOT (6k rpm) for my motor, for any sustained amount of time? I’ve only owned 2-stroke motors in the past so not much experience with 4-stokes. I wouldn’t keep it there too long because of fuel burn but just curious if the motor could handle it.
« Last Edit: October 23, 2017, 09:11:16 PM by Fisherdv »
2018, Sea Chaser 16, Honda 60HP

Offline blindmonkey

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #9 on: October 23, 2017, 08:11:37 PM »
The VTEC variable valve timing on my Honda BF90D outboard begins working at 5300 RPM so I think Honda expects operation at high RPM.
Lorne
2013 17' Sea Chaser, Honda 90, Yamaha F8
1994 Sea Explorer, Mercury 60, SOLD

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #10 on: October 23, 2017, 08:20:34 PM »
I tend to think of outboards as having more in common with motorcycles than old v8 car engines.  They are designed to produce their peak power at the top of their RPM range, and have rev limiter to prevent you from damaging the engine.

Modern car engines are the same way. 

Ive had my share of older V8 chevy/gm motors and redlining on a V8 scares me on a stock motor. But it is incredible what some of those sport bikes rev up too.
2018, Sea Chaser 16, Honda 60HP

Offline Threeweight

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #11 on: October 23, 2017, 09:49:25 PM »
Not going to hurt a thing.  You can't redline a modern 4 stroke outboard, the rev limiter will kick in and prevent you from reaching those RPM's.
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #12 on: October 23, 2017, 10:00:50 PM »
Ok, thanks again guys! I’ve been fishing with my wife lately and this last trip I brought one of my buddies. He weighs about 80 more pounds than her and I noticed it on the gas I burned compared to having her with me. I guess every pound really makes a difference. If I do very short runs and troll all day I get very good fuel efficiency. With my buddy this last time we ran for a good while at about 5400rpms and used a lot more gas. I’m looking into getting a larger gas tank to accommodate running at higher rpms on long runs.
2018, Sea Chaser 16, Honda 60HP

Offline Yachter Yat

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #13 on: October 24, 2017, 07:20:23 AM »
Fisher;  Are you running that 13" pitch prop?

Yat
Dear Arima:  Stretch the Hunter platform by 5. Next, stretch the Explorer by 9 and steal 2 or 3 from the cabin.  Please hurry, I'm getting old.

16 SC/Honda 60

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #14 on: October 24, 2017, 07:49:59 AM »
Fisher;  Are you running that 13" pitch prop?

Yat
Im still running the same 13 pitch prop, the new Powertech SCD 14 pitch is gonna be delivered today finally. May be a couple weeks before I can give it a spin. I’ll let you know how it works out
2018, Sea Chaser 16, Honda 60HP

Offline Markshoreline

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #15 on: October 24, 2017, 08:38:53 AM »
If you network your motor and chart plotter you can see your fuel burn in real time.  It’s remarkable what minor trim and ROM adjustments make to your fuel burn. 
2002 Sea Ranger HT 21, Yamaha 150, Yamaha 9.9

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #16 on: October 24, 2017, 08:50:01 AM »
If you network your motor and chart plotter you can see your fuel burn in real time.  It’s remarkable what minor trim and ROM adjustments make to your fuel burn. 

I have a Lowrance elite 5 right now. I’m not sure if it supports that but I will have to look into it. What’s involved with setting it up? I would really like to do that.
2018, Sea Chaser 16, Honda 60HP

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #17 on: October 24, 2017, 08:58:14 AM »
Actually now that I think about it I believe my Lowrance does have the NMEA wires. Not sure which wires to run from the motor? My VHF radio has GPS and DSC built in so I don’t need to network that.
« Last Edit: October 24, 2017, 09:13:37 AM by Fisherdv »
2018, Sea Chaser 16, Honda 60HP

Offline Threeweight

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #18 on: October 24, 2017, 01:21:58 PM »
You need NMEA 2000 to get engine data displayed on your electronics (the older NMEA 0183 won't work).

You need a NMEA 2000 starter kit, and the correct interface cable to link your motor to the network (if your plotter is compatible.)
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #19 on: October 24, 2017, 02:24:08 PM »
You need NMEA 2000 to get engine data displayed on your electronics (the older NMEA 0183 won't work).

You need a NMEA 2000 starter kit, and the correct interface cable to link your motor to the network (if your plotter is compatible.)
My elite 5 is NMEA 0183, the elite 7 has the NMEA 2000. I was planning to upgrade my ff/gps at some point.
2018, Sea Chaser 16, Honda 60HP

Offline Threeweight

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #20 on: October 24, 2017, 03:23:29 PM »
Yeah, you'll need to upgrade.

Does your motor have Honda's analog or digital gauges?  My 225's digital gauge is a NMEA 2000 unit, the network was rigged by the dealer.  All I had to do was plug my Raymarine into it.
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #21 on: October 24, 2017, 03:32:56 PM »
Yeah, you'll need to upgrade.

Does your motor have Honda's analog or digital gauges?  My 225's digital gauge is a NMEA 2000 unit, the network was rigged by the dealer.  All I had to do was plug my Raymarine into it.
Analog gauges
2018, Sea Chaser 16, Honda 60HP

Offline beancounter

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #22 on: October 24, 2017, 04:00:46 PM »
Seems all the four strokes fuel burn increases greatly when you go past 4500 rpm. Usually the sweet spot is about 4000-4500. That's where I like to run mine.

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #23 on: October 24, 2017, 04:11:06 PM »
Seems all the four strokes fuel burn increases greatly when you go past 4500 rpm. Usually the sweet spot is about 4000-4500. That's where I like to run mine.
I agree, that’s why I’m hoping my new prop will increase my cruise speed. The new prop is being delivered today.
2018, Sea Chaser 16, Honda 60HP

Offline Markshoreline

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #24 on: October 24, 2017, 08:02:27 PM »
Setting up the network with nmea 2000 is just plug and play, pretty simple!
For trim, rpm and fuel burn I set up this set of gauges which I keep on routinely.
2002 Sea Ranger HT 21, Yamaha 150, Yamaha 9.9

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #25 on: October 24, 2017, 08:06:24 PM »
Setting up the network with nmea 2000 is just plug and play, pretty simple!
For trim, rpm and fuel burn I set up this set of gauges which I keep on routinely.

How does it know how much fuel is remaining? Is it connected to a fuel gauge or sending unit in the fuel tank?
2018, Sea Chaser 16, Honda 60HP

Offline Threeweight

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #26 on: October 24, 2017, 08:33:52 PM »
When setting it up, you tell it your fuel capacity. Reset it each time you fill the tank, and it then measures how much fuel the engine's computer is sending through the injectors in real time, and records consumption, so you get your remaining fuel.
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Online Fisherdv

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #27 on: October 24, 2017, 08:40:50 PM »
Ok, thx. I would really like to have that capability. Time for a new ff/gps. What’s another boat buck  :doh: I’m sure I’ll need your guys help when I’m ready to set it up.
2018, Sea Chaser 16, Honda 60HP

Offline Markshoreline

Re: Is it bad for motor to run at 5300-5500 rpm for long distances?
« Reply #28 on: October 24, 2017, 09:58:44 PM »
You can even do a partial fill and instead of fill all tanks you can just add say, 12 gallons.  This is seriously my favorite tech thing on the boat.  Knowing the exact amount of fuel remaining and your usage it is possible to accurately estimate how many hours or miles you are able to travel.
2002 Sea Ranger HT 21, Yamaha 150, Yamaha 9.9