kenman
New Member
Where can I find expected performance data on a 2000 310? I have twin 350's v drives & the boat is a pig in the water. The engine guy blames the diver blames the props blames the boat etc,etc. Anybody with some straight poop?
310 performance
- Thread starter kenman
- Start date
Sundancer
Well-Known Member
- Jul 20, 2005
- 2,909
- Boat Info
- 34 year old CLASSIC 300 DA, towed almost anywhere behind the Duramax Dually Crew Cab.
- Engines
- 16 cyl, 700 cu. in./Alpha I's
So lets' start at the beginning.... What are the symptoms? What are your RPM's at wide open throttle? If you are unable to hit the suggested range for WOT, then we talk props or tune-up or bottom crud. When you say it's a pig in the water, are you talking around the docks, just in general or gallons burned? I'm guessing straight inboards or I/O? My 30 footer gets up on plane a LOT faster than the 250 DA.
SeaHarley
New Member
- Oct 12, 2006
- 370
- Boat Info
- 1998, 3870 Cruisers Yacht
SOLD: 1999, 310DA Sea Ray
- Engines
- 7.4, 454 MPI Horizons, in 3870 Cruisers
(310DA Sea Ray was 5.7, 350 MPI Mag)
You should be at approximately:
28 GPH @ 3,400 RPM
28 GPH @ 3,400 RPM
kenman
New Member
thanks for the efforts
here's the scoop
merc 350 (2) velvet drives (2) unknown prop pitch (3 blade)
port gearbox replaced 20 hrs ago ,2 new heads on port engine 6 hrs ago
poor performance preceeded both
boat is very hard to get on plane- port engine goes to 3800 rpm & starboard 4k to stay on plane @ about 20mph I am afraid to push the rpms much higher ( what is a safe rpm?) Port engine will not go to 4000rpm regardless of throttle.
here's the scoop
merc 350 (2) velvet drives (2) unknown prop pitch (3 blade)
port gearbox replaced 20 hrs ago ,2 new heads on port engine 6 hrs ago
poor performance preceeded both
boat is very hard to get on plane- port engine goes to 3800 rpm & starboard 4k to stay on plane @ about 20mph I am afraid to push the rpms much higher ( what is a safe rpm?) Port engine will not go to 4000rpm regardless of throttle.
skolbe
Well-Known Member
- Oct 3, 2006
- 3,549
- Boat Info
- 320 Sundancer, Zodiac 290 Wave Inflatable Tohatsu 6HP, Boston Whaler 130 Sport
- Engines
- 350 Mag V-Drive - Kohler 5ecd
Well you have some issues. The boat should get up in the high 4000 rpm - range. Which would imply that the boat has the wrong props. But with all of the other issues you are having - I would be concerned with the engines being tuned properly and that the bottom and running gear is not fouled up. Something is not right. My 320 with 350 Mag's is around 24 GPH at 3600 RPM's - cruising around 24 mph on the GPS.
Sundancer
Well-Known Member
- Jul 20, 2005
- 2,909
- Boat Info
- 34 year old CLASSIC 300 DA, towed almost anywhere behind the Duramax Dually Crew Cab.
- Engines
- 16 cyl, 700 cu. in./Alpha I's
My 300 DA planes very easily. I can put the engines to 3500 rpm and if just a few seconds I'm planing across the water. If I push it, I can get to 4600 rpm's easily, I just hate the sound of the motors revving that high. I can actually go higher, I just hate to do it and yes, I need more pitch!
I agree with Skolbe, you have some issues. Has it been tuned recently? What kind of hours on the engine? If everything checks out, then I'd start looking at the props to see compare it with the size others are running.
I agree with Skolbe, you have some issues. Has it been tuned recently? What kind of hours on the engine? If everything checks out, then I'd start looking at the props to see compare it with the size others are running.
RonF
New Member
- Oct 4, 2006
- 410
- Boat Info
- 310 Sundancer 1999
- Engines
- Mercruiser Mag 350 MPI, V-drives
kenman,
You probably have the 1.5:1 reduction in your v-drives and stock 16x17 props. Sounds like the performance of my boat when I got it four years ago. When I needed props due to damage, a well-informed yard manager and prop shop put 16x15 props on it, and all the performance problems were cured. Top end went from 4000 RPM and 23 KTS up to 4600 RPM and 26 KTS. Cruise went from 19 KTS at 3400 RPM to 20 KTS at same 3400 RPM. Acceleration was noticably improved, and engines never seem labored. Yes, Sea Ray can make a mistake like that and ignore it for those owners. If your props have never been damaged, then a prop shop can do a computer scan and take two inches of pitch out of them.
You probably have the 1.5:1 reduction in your v-drives and stock 16x17 props. Sounds like the performance of my boat when I got it four years ago. When I needed props due to damage, a well-informed yard manager and prop shop put 16x15 props on it, and all the performance problems were cured. Top end went from 4000 RPM and 23 KTS up to 4600 RPM and 26 KTS. Cruise went from 19 KTS at 3400 RPM to 20 KTS at same 3400 RPM. Acceleration was noticably improved, and engines never seem labored. Yes, Sea Ray can make a mistake like that and ignore it for those owners. If your props have never been damaged, then a prop shop can do a computer scan and take two inches of pitch out of them.
SeaHarley
New Member
- Oct 12, 2006
- 370
- Boat Info
- 1998, 3870 Cruisers Yacht
SOLD: 1999, 310DA Sea Ray
- Engines
- 7.4, 454 MPI Horizons, in 3870 Cruisers
(310DA Sea Ray was 5.7, 350 MPI Mag)
I also have the 16 x 15 props and max RPM is 4,600................
Bill F
New Member
I have a 2002 310 with 17 X 20 props and max RPM is 4800.
RonF
New Member
- Oct 4, 2006
- 410
- Boat Info
- 310 Sundancer 1999
- Engines
- Mercruiser Mag 350 MPI, V-drives
Bill,
With 17 x 20 you must have a greater gear reduction. I think there was a change around 2002.
With 17 x 20 you must have a greater gear reduction. I think there was a change around 2002.
Bridog
Well-Known Member
Sorry for the slight hi-jack, but was there a water ingestion problem on the 2001 era 310's with the 350 horizon V-drives? A guy at my marina told me he just had to replace his engines due to water coming in through the exhaust.
RonF
New Member
- Oct 4, 2006
- 410
- Boat Info
- 310 Sundancer 1999
- Engines
- Mercruiser Mag 350 MPI, V-drives
Not sure about the years. 1999 was definately involved, probably up to 2002. Please do a search
Bill F
New Member
Ron
Not sure what the gear reduction is on my 2002, but I will see if I can find out this week end. I should be wet by the end of the week.
Also on another thread did I see you were interested in a camper canvas? I just had one made and will get pictures this week end and will post them.
Not sure what the gear reduction is on my 2002, but I will see if I can find out this week end. I should be wet by the end of the week.
Also on another thread did I see you were interested in a camper canvas? I just had one made and will get pictures this week end and will post them.
RonF
New Member
- Oct 4, 2006
- 410
- Boat Info
- 310 Sundancer 1999
- Engines
- Mercruiser Mag 350 MPI, V-drives
Great, Bill. I need some examples from my style boat. You might want to PM me or start a new thread.
KayKook
New Member
Veem supplied the props on that year 310 I believe. That is the problem I would suspect. Wrong pitch for the gearing.
Camper Canvas on 1999 310DA
Camper Canvas on 1999 310DA
Last edited:
RonF
New Member
- Oct 4, 2006
- 410
- Boat Info
- 310 Sundancer 1999
- Engines
- Mercruiser Mag 350 MPI, V-drives
KayKook
Sweeeeet camper.
Where is Mitten State?
Sweeeeet camper.
Where is Mitten State?
KayKook
New Member
Drama Queen
New Member
- Feb 13, 2008
- 369
Holy cow!!! all these years looking at the map and I never saw the Mitten before.:smt009
RonF
New Member
- Oct 4, 2006
- 410
- Boat Info
- 310 Sundancer 1999
- Engines
- Mercruiser Mag 350 MPI, V-drives
I see it now, but only because of the power of suggestion.
