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325 Aft Cabin - Pokey Speeds
- Thekaj
- Scurvy Dog
- Posts: 22
- Joined: July 18th, 2020, 8:06 pm
- Vessel Info: 1995 325 Aft Cabin
- Location: Seattle, WA
- Been thanked: 4 times
325 Aft Cabin - Pokey Speeds
RPM-wise, if I run at around 2800, we'll go around 9 mph. Boosting it to about 3200, we'll only break 10-11 mph. Going above that, it's still just fractionally faster. We'll only get up a bit beyond that amount when we've got very favorable currents. Again, Carver's spec sheet says that we should be doing about 25 mph at 3200.
Are there any thoughts on what could cause the difference between the posted cruising/max speeds and what we're actually experiencing? The only other thing I can think of is that a previous owner replaced the props with something a lot smaller than original. But as it'll probably be a while before we pull her out again to check, any thoughts on other things to test/tinker with in the meantime?
- waybomb
- CYO Moderator
- Posts: 2404
- Joined: February 5th, 2013, 9:24 pm
- Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85
1996 Boston Whaler Rage 15 - Location: Saint Joseph,Mi
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Re: 325 Aft Cabin - Pokey Speeds
If they are, I'd be looking at those props.
Fred
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
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- CYO Supporter
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- Vessel Info: 1989 Carver 3807 Aft Cabin
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Re: 325 Aft Cabin - Pokey Speeds
What rpm are you achieving at WOT (wide open throttle) in gear?
- buster53
- Admiral
- Posts: 994
- Joined: May 12th, 2017, 10:41 am
- Vessel Info: 2001, Carver 356
- Location: Lower Potomac, VA
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Re: 325 Aft Cabin - Pokey Speeds
When was the last time your boat was hauled and bottom cleaned/painted?
- Thekaj
- Scurvy Dog
- Posts: 22
- Joined: July 18th, 2020, 8:06 pm
- Vessel Info: 1995 325 Aft Cabin
- Location: Seattle, WA
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Re: 325 Aft Cabin - Pokey Speeds
The port tach definitely needs to be recalibrated, as it is certainly off after the new engine was installed. Starboard seems fine. I haven’t taken her up to WOT in a while, but specs say it should be 4,400, and that feels about where it would be, given where the throttle is at 2,800 and 3,200. And I’ll note that it was having this issue when the old port engine was in there too.
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- CYO Supporter
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- Joined: March 28th, 2016, 10:52 pm
- Vessel Info: 1998 Carver 355
Suspicious Fishes !
2022 Kawasaki 310X - Location: upper chesapeake bay
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Re: 325 Aft Cabin - Pokey Speeds
A friend of mine has a 1999 325 with mercury 350 magnums. His will do 40mph. He actually pulls the kids on tubes with it.
- bud37
- Admiral
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Re: 325 Aft Cabin - Pokey Speeds
Planing hulls work at two speeds, hull speed, ( for your boat, around 6 to 7mph ), and on plane with the hull on top ( starting around 14 Mph )......between those two is the giant wake behind the boat.
- buster53
- Admiral
- Posts: 994
- Joined: May 12th, 2017, 10:41 am
- Vessel Info: 2001, Carver 356
- Location: Lower Potomac, VA
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Re: 325 Aft Cabin - Pokey Speeds
Thekaj wrote:Bottom was painted last October. We took her out right afterwards and got the same speeds.
I hear you, but just an FYI, your running gear can accumulate a lot of barnacle growth since it was painted.
My boat was painted in mid April and I had to pull it out 10 weeks later to clean the running gear as I had lost about 7 knots in that short amount of time.
- Cooler
- Admiral
- Posts: 1547
- Joined: May 22nd, 2018, 12:09 pm
- Vessel Info: 1995 Carver 330 Mariner
Twin 350XL Crusaders
Home port: Menominee, MI - Location: Green Bay, WI
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Re: 325 Aft Cabin - Pokey Speeds
( All weather people have to say this on air, near lakes )
- Thekaj
- Scurvy Dog
- Posts: 22
- Joined: July 18th, 2020, 8:06 pm
- Vessel Info: 1995 325 Aft Cabin
- Location: Seattle, WA
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Re: 325 Aft Cabin - Pokey Speeds
And yeah, I've got fuel flow sensors on both engines, so I'm acutely aware of the exponentially poor fuel economy we get as I increase throttle and DON'T get on a plane. There's quite the psychological pressure though to push up the throttle, so as to go just a bit faster, despite the hole it opens up on our bank account. Especially since our last boat was much smaller and could easily do 25 mph. Doing 9-10 mph instead is a very slow moving form of torture.
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