Good to know, this one only has about 500 on it. Thanks again
420/44 DB Owners Club
- Thread starter Alex F
- Start date
Robf
Active Member
- Apr 17, 2013
- 367
- Boat Info
- 2006 44 Sedan Bridge
Cummins QSC 500s
Walker Bay Center Console Dinghy
- Engines
- Twin Cummins QSC 500s
Out of the water portion of survey passed with flying colors. Now waiting until the weather warms for the sea trial and then take possession! Can't get here soon enough!Rob
Carpediem44DB
Well-Known Member
- Aug 18, 2015
- 3,230
- Boat Info
- 2000 Carver 506
2006 44 DB Sedan Bridge
- Engines
- Volvo TAMD 74 P
Happy for you Rob, don’t know anyone that regrets going 420 or 44DB. If I didn’t have the 10 foot itch so bad, I’d continue to love mine for many years to come.
Cheers
Cheers
Robf
Active Member
- Apr 17, 2013
- 367
- Boat Info
- 2006 44 Sedan Bridge
Cummins QSC 500s
Walker Bay Center Console Dinghy
- Engines
- Twin Cummins QSC 500s
Thanks Roger, if all goes well, will be coming your way on the return trip!
Robf
Active Member
- Apr 17, 2013
- 367
- Boat Info
- 2006 44 Sedan Bridge
Cummins QSC 500s
Walker Bay Center Console Dinghy
- Engines
- Twin Cummins QSC 500s
Rusty, I am well aware of that problem! Just a few feet behind you! Good luck on the next round.
Rob
RBB
Well-Known Member
- Dec 18, 2019
- 2,080
- Boat Info
- 2004 480MY
2006 44DB
2019 Sea Doo GTX 155
Pelican Kayak
2004 390 MY Sold
- Engines
- Cummins QSM11 680Hp
Cummins QSC 500
Let me know if your going to stop at HP.
Love to see the boat.
Robf
Active Member
- Apr 17, 2013
- 367
- Boat Info
- 2006 44 Sedan Bridge
Cummins QSC 500s
Walker Bay Center Console Dinghy
- Engines
- Twin Cummins QSC 500s
Roger, that would be the plan as it is about half way. Also, according to Quimby's it has diesel available, is that correct?
Robf
Active Member
- Apr 17, 2013
- 367
- Boat Info
- 2006 44 Sedan Bridge
Cummins QSC 500s
Walker Bay Center Console Dinghy
- Engines
- Twin Cummins QSC 500s
Absolutely! Looking forward to seeing all your upgrades to the 390!
Regarding a 2005 420DB with the 480CE's I've had my eye on -
Here is the survey sea trial snippet I was able to get from the broker, I haven't put this against SBmar's recommended fuel curve for them yet but what do you guys think? Is it in the expected range?
Here is the survey sea trial snippet I was able to get from the broker, I haven't put this against SBmar's recommended fuel curve for them yet but what do you guys think? Is it in the expected range?
Good results. You should in fact see 2680, not 2600.
thanks! I think that's all I can ask of the broker/seller pre survey. At this point I'll have to investigate fuel burn at varying RPMs as part of my own engine survey and sea trial
ZZ13
Well-Known Member
I suspect you've read Tonys article, but load/fuel burn is your target here more than WOT rpms. To match 450 Diamond loads you want to be no more than 13.6 gallons per hour at 2200 rpm.
Yep, I have (a bunch of times actually)
Unfortunately they don't have that data, or at least they're not sharing it, so it will have to be discovered pre-purchase through the survey process and addressed accordingly. I might call Cummins and see if I can get them to comment on what kind of discovery can be done on the engines to determine the possible damage done at the ~500 or so hours these engines have but based on my research I suspect you can't do a whole lot to predict a dropped valve before it happens
Side note, does Smartcraft keep runtime RPMs on these motors? I would imagine less damage is done if 300 of the 500 hours have been at idle or hull speed versus cruise or higher.
ZZ13
Well-Known Member
Yes, it does seem like it's the dropped valve lottery. Since I don't have these engines I never dug into what preventatively replacing the factory heads does. Anyone know what the new heads fix to prevent the dropped valve scenario? I guess that could be a risk reduction negotiation. Split the cost of potentially preventatively replacing both heads. Then at least the risk is shared and not all yours.
Carpediem44DB
Well-Known Member
- Aug 18, 2015
- 3,230
- Boat Info
- 2000 Carver 506
2006 44 DB Sedan Bridge
- Engines
- Volvo TAMD 74 P
I have a friend that dropped a valve and ended up replacing both heads. I do t know what engineering changes were made but I’m pretty sure the original 480CE heads had valve seats pressed in but the later may not even have seats just that the valve seat is machined into the head. Either way there have been at least two revisions of the heads and I’ve never heard of a recurring valve seat issue after the change was done.
I understand that the cost is between 8 and 12 grand per engine to replace the heads prophylacticly.
I understand that the cost is between 8 and 12 grand per engine to replace the heads prophylacticly.
Carpediem44DB
Well-Known Member
- Aug 18, 2015
- 3,230
- Boat Info
- 2000 Carver 506
2006 44 DB Sedan Bridge
- Engines
- Volvo TAMD 74 P
Has anyone with a 44 or 420 SD found gelcoat stress cracks on the fore deck? I've got a series of cracks about 18 inches long in the radius between the forward stateroom hatch and the fender lockers. They have been there since I bought the boat 5 years ago and don't seem to be growing. Just wondering if this is common.
Robf
Active Member
- Apr 17, 2013
- 367
- Boat Info
- 2006 44 Sedan Bridge
Cummins QSC 500s
Walker Bay Center Console Dinghy
- Engines
- Twin Cummins QSC 500s
Rusty, can you tell me about your davit system? I am trying to decide on what to do to carry a Walker Bay center console dinghy on the 44. The set up is about 500 lbs with a 20hp outboard.
Thanks,
Rob
Carpediem44DB
Well-Known Member
- Aug 18, 2015
- 3,230
- Boat Info
- 2000 Carver 506
2006 44 DB Sedan Bridge
- Engines
- Volvo TAMD 74 P
Rob, I researched many different davit systems and after determining that I did not want to invest in a retractable swim platform let alone adding the weight and maintenance issues I decided that the Nick Jackson was the way to go. As luck would have it I ran into a boat owner that had abandoned his, opting to use a crane davit as his boat had a hardtop to stow a dink on. He made me a great deal on his old Nick Jackson. It did not have the reinforced supports that would be required for installation on the 44. Many boats have a solid transom that will support the fixed anchor required to pull against. The 44's transom is not structural to the hull at all. It is really just a molded locker screwed to the deck. I built a hard point to install on the aft end of the flybridge deck out of a 3/16th SS plate to use as the anchor point. I opted to keep mine removable and much to my surprise the Davit only weighs about 65 lbs. I use a removable 12 volt cord that is stowed in the transom locker when I need to use davit. This made the install and portability simple.
The davit handles my Achilles 350 center console that weighs in at about 450 with ease. It rides solid as a rock in moderate short chop which is about as bad as we get in the Bay and Delta with a couple of lines or ratchet straps to the aft cleats. It takes me about ten minutes from the bed of my truck to being ready to load the dink when I am planning to need the dink on a cruise. Down side is while the davit is installed one needs to mind the support cables when traversing the swim platform. I mitigate that by tying to port so guests don't have to pass under the cables. I can give you specifics as to the install if you like. I have been really happy with the set up. Cheers
The davit handles my Achilles 350 center console that weighs in at about 450 with ease. It rides solid as a rock in moderate short chop which is about as bad as we get in the Bay and Delta with a couple of lines or ratchet straps to the aft cleats. It takes me about ten minutes from the bed of my truck to being ready to load the dink when I am planning to need the dink on a cruise. Down side is while the davit is installed one needs to mind the support cables when traversing the swim platform. I mitigate that by tying to port so guests don't have to pass under the cables. I can give you specifics as to the install if you like. I have been really happy with the set up. Cheers
