Travelling at WOT
Just curious as to how to many guys with boats belt around at Wide Open Throttle when the conditions allow.
Myself, I'll sit on about 5100rpm when its flat but that's still 30 knots with a fully laden 6.1m ali being pushed by a 150 4 stroke yamaha.
The sweet spot for fuel economy though is around 4200-4500rpm.
Can't personally see the point in caning the motor at 6000rpm but I'm just wondering if I'm babying the motor to much. When I had a two stroke I used to crack it right open occasionally just to clean it out but with the modern four strokes I don't see the need.
Interested in peoples thoughts.
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Jigs available online in my web store!
Faulkner Family
Posts: 18029
Date Joined: 11/03/08
i generally run my 350 chev
i generally run my 350 chev at around 3000 rpm which gives me around 22 to 23 knts in calmish waters using about 80ltrs for 55 to 60nm trip, occasionally on the way in i will open her up to 4000rpm at around 30knts which isnt too bad for a boat that weighs over 2tonne at 7mtrs but she tends to suck down the juice. dont like to punnish the boat or our boddies so im generally fairly easy going on the throttle, we all like to go fast but no real need. going too fast you could miss out on some nice ground to fish
RUSS and SANDY. A family that fishes together stays together
Bluebonefamily
Posts: 218
Date Joined: 15/08/09
We have the same motor and
We have the same motor and get about the same knts for rvs on our boat too. We have never actually tested the motor's limits, there has never been a need. We go as fast as can safely go in the conditions, usually enough to get up on the plane and cruise along.
Member of Cockburn Power Boats Association
mako magic
Posts: 5785
Date Joined: 03/08/05
nothing like a bit of WOT
nothing like a bit of WOT especially racing people back to the ramp lol
i normally drive to the conditions but dont like to hammer the boat and pound it
Rosco
Posts: 454
Date Joined: 20/11/07
give it heaps
Give her heaps Big John! Pedal to the metal.I reckon a good squirt is great in glass conditions. With a 150 four stroke why wouldn't you!
You never baby your crewies so why baby your 4 stroke?
Rosco
big john
Posts: 8751
Date Joined: 20/07/06
Watcha my shoulder
What are you talking about chaunce, you've had plenty of free rides.
Deliberately dropping a mackie on your shin so you couldn't pull the anchor, watcha my neck and who could forget the supposedly sore shoulder. Strange how it didn't hurt when you hooked those GT's in April!
LOL
When are you having the recon?
WA based manufacturer and supplier of premium leadhead jigs, fligs, bucktail jigs, 'bulletproof' soft plastic jig heads and XOS bullet jig heads.
Jigs available online in my web store!
Feral
Posts: 1508
Date Joined: 01/11/06
i sit on about 4000rmp with
i sit on about 4000rmp with the chev moving me at 30+knots but only if conditions allow ... most of the time down here its 3000-3500 @25 knots ... no need to hammer it .. but im also running a brand new motor thats only done 20 hours .. every time i want to floor it i think of the 25k it cost me to install it :P
Faulkner Family
Posts: 18029
Date Joined: 11/03/08
the chev 350 are a good
the chev 350 are a good motor, i get the best economy at around the 3000 to 3200 rpm in mine, at 3500 they just purr like a tiger on steroids.
RUSS and SANDY. A family that fishes together stays together
kempy
Posts: 810
Date Joined: 28/05/09
yes the chevs r a good
yes the chevs r a good engine that y u play bout 25k like us to have them
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gregk
Posts: 169
Date Joined: 03/02/09
just cruze
i have 90 honda and sit on 5000 rpm when conditions allow no need to ring its neck to save 15 mins
Rick
Posts: 1112
Date Joined: 22/12/06
Glass off
Nothing better than coming home on one of those glaas off days and open it right up.
Usually do it a couple of k's out from the ramp just to blow the cobwebs out,looking back at the wake............
PGFC Member
damo6230
Posts: 2029
Date Joined: 07/06/08
usually cruise to the conditions
but if a glass off or on the river then i will give it full throttle just to blow the cobwebs.....but not for long
my best economy is around 3500-4200rpm
Cammos
Posts: 606
Date Joined: 30/06/09
When I had the old 2 stroke
When I had the old 2 stroke Johno it was wide open as often as the hull would allow, but the stern drive needed to be nursed a bit too much for my liking.
I go fast as often as possible.
Brunno
Posts: 22
Date Joined: 13/08/09
250hp Suzuki 4str
We usually cruise at between 20 and 22 knots depending on conditions. When we get glass off we normally bump that up to about 24knots. We figure that the motor isn't working as hard when there isn't any sea to deal with. But we always give it a blast to WOT for a few minutes if conditions allow. Just because it is part of the fun of owning a boat!
just dhu it
Posts: 1081
Date Joined: 14/05/09
full noise
The modern four strokes are the same as your car engine, how often do you drive your car at maximum redline revs, the 2 stroke days you need to fang it ocasionaly to clean out the oil etc, my 6.1 alli + 150 yammy cruises nicely in good conditions 4.3k about 30 knots @ 1lt per NM , i drive the boat for the conditions and my crews safety and enjoyment , going flat out is okay but my view is things happen to quickly at high speed and the enjoyment soon sours when some one gets hurt or gears damaged. 20 to 24 knots is pretty good and comfortable on a long haul
Simon C
Posts: 801
Date Joined: 01/05/07
Agreed - flat out is one of
Agreed - flat out is one of the joys of owning a boat on glass off, that said, I pulled the 300 hour report on my 150etec and it showed I had used full throttle for about 1% of the time, so in reality that is not much. And I will bet every bit of that was coming back in on dusk at Exmouth trying to make the pub for dinner. Generally sit around the 4500rpm gives about 28knots and acceptable fuel economy - .8nm/l
uncle
Posts: 9479
Date Joined: 10/02/07
crewies
right on John,that rosco will do whatever it takes, to get out of his duties,never actually pulled max.revs in the old girl,like coming home fast on a calm off.
all aggressive fish love bigjohnsjigs
Bodie
Posts: 3758
Date Joined: 05/11/07
my understand is 4 stks are
my understanding is 4 stks are built to run at high revs, and run better at high revs.
Saying that i dont go flat stick all that often. But will give her a squirt getting close to the ramps to be others in, especially if i can see a few boats coming in at once.
For me, around 4000-4100 gives me 25knots from the twin 140's. Fuel economy is approx 1.30/nm
Flat stick is up at around 5600, and can get 39knots on the river, but only about 34-35 on open ocean.
jersey
Posts: 393
Date Joined: 12/06/08
Revs
I stick at between 38 and 4500rpm,I find this speed is the best for almost all weather conditions,as I have a lower back injury and I can walk off after a days boating,and I dont pound the shi iits out of my boat,I have used 5250/5500,rpm at the Mackerils with 5 on board and the sea like glass,but it was for a short burst to beat another boat with me,I find a great many boats can go real fast with the modern motors but the hull hitting the water at some high speeds is like a hammer being banged against the boat,I look at some and think Why?,Aluminum is a great product and is strong,but how many ali boats get cracks around the welds after a while,and the boat at the Mackerils was a walk around Whitley it was brand new for the trip but after a particularly rough bit of sea winds 23knots on the bow a lot of bits were loose on it.
Frank F
Posts: 481
Date Joined: 17/03/09
Cats
Most of the time I sit on 23-26 knots which it is about 5000rpm, which my cat loves to ride at, but when it is like glass you can't resist giving it to her for a few minutes
wrassinator
Posts: 554
Date Joined: 26/11/08
Maaaayte. 2 strokes thrive
Maaaayte. 2 strokes thrive in WOT !!! I need no excuse for WOT on my 40hp 2-stroke Mariner provided sea conditions permit ! always open her up for a good belting, but defer back down the rev range to 3/4 cruise after 5 mins or so. It blows the cobwebs outta the carbs, not to mention the oil crud from the cylinders ! lol
King-Prawn
Posts: 56
Date Joined: 27/05/09
That Aint Living
90 hp 2 stroke Mercury. 18 foot Glass Fraser
We usually come home from Rotto flat out. Can get 35 Knots in calm conditions.
# 1 on the water baby
wayneleech
Posts: 362
Date Joined: 27/06/08
i have a optimax 90 on a
i have a optimax 90 on a 5.4m trailcraft profish - usually sit at 5000rpm which gets me 30-32knts
just dhu it
Posts: 1081
Date Joined: 14/05/09
WOT
When i first bought my 6.10 trailcraft c/cab the motor was upgraded to a 175 hp Verada, 6000rpm 48 knots it was scary for my age, to many problems with the motor , i then changed to a 150 hp 4st yammy, some days i still wish i had the extra HP
solly
Posts: 375
Date Joined: 11/09/05
WOT+
250 etec is bloody awsome(scary too) at wot but for economy my I sit at 3500rpm averaging 23 to 25 knots with 19 inch prop. dont alway want to do 50 knots
solly
There are two types of people ,do'ers and watchers
Right now the do'ers are the doing it
And the watchers are watching us do it
JustinMawer
Posts: 12
Date Joined: 28/11/09
On the way in
We have a 27' Chivers being pushed by a volva penta 200 turbo diesel. Usually at around 2500rpm we get 16-18 knts depending on winds and that gets us about 10litres an hour I'm pretty sure. We can crank it out to 25 knts at 3200rpm which is good for a 3Tonned glass boat.
wide open
Posts: 444
Date Joined: 24/12/09
with our old 80hp mercury on fraser 19
we had 2 speeds, stop and full throtttle, it was ran at full throttle no matter how long the drive most of the time if conditions allow, had for 15-20 years, rebuild at ten another 10 please said the merc
tournament
Posts: 376
Date Joined: 10/11/09
i open it up for a little
i open it up for a little bit but usually sit on about 4000 rpm