500/520 DB official thread

The systems monitor on my 52 does not work and the display is currently removed. So, I'm looking into alternant solutions; right now I'm talking to the folks at Chetco Digital on their Seagauge G2 converter and their 5.7 inch touch screen display. We are working the NMEA 2000 PGN's for all of the Sea Ray Systems Monitor input devices as well as quite a few more. Once I sort all through that I'll make some decisions.... Also looked at the Albatross Albacombi NMEA 2000 converter however the Seagauge G2 is more adaptable. We are working through an audible alarm through one of the device's output relays that can be cancelled via a touch screen command. The boat is getting a complete NMEA 2000 backbone installed so this system will camp on that. If you are interested I can keep my progress updated here...
Tom
So, here is an update and where I'm going.
As it end's up there is a rather fully integrated solution that will accommodate all of the systems monitor points as well as host growth to almost an endless list.
When you look at what Maratron has in their product line they can accommodate everything needed and it's all integrated; in other words, their product line will host all of the NMEA 2000 PGN's which ends up being the really big issue end to end in a network. Here is the lineup:
Maratron DSM250 or DSM410 - these are the helm displays and control units (the 250 is about 6 inches square and the 410 is about 4.5 inches square). The Maretron displays also are the programming means for all of the end item interface modules. The DSM displays interface with the NMEA 2000 backbone.
Maratron RIM100 - this is a 6 channel discrete interface module which all of the Sea Ray Monitor interfaces (Exhaust Overtemp Switch, Bilge pumps, Ignition On, etc) would interface with. This replaces the Sea Ray Monitor interface module. The RIM100 is programmed using the DSM display. The RIM100 interfaces with the end items being monitored and the NMEA 2000 backbone. Multiple RIM100 modules can be integrated simply by changing the instance number when programming.
Maratron ALM100 - This is an alarm module that can be adjusted between 105db and 90db. Like the other components the alarm module camps on the NMEA 2000 backbone.
Now, here is the big question - if there is an alarm and the noise maker is blaring, how do you silence it? With this Maretron system you press the power button on the display and the alarm is acknowledged and silenced however the alarming element is still indicated in alarm on the display. If there is cascading alarms then each alarming item needs a separate press of the display's power button to acknowledge and be silenced. So that answered all of my questions and issues with a replacement system.
https://www.maretron.com/products/dsm250.php
https://www.maretron.com/products/dsm410.php
https://www.maretron.com/products/alm100.php
https://www.maretron.com/products/rim100.php
As for cost with the DSM410 looks to be around $1200 all in and with the DSM250 around $1500 all in. Not bad when used Sea Ray Monitor displays are getting about $700 when they can be found....
More to follow.
Tom
 
Last edited:
One other quick comment on EGT. I have to believe the entering water temperature of where you’re running the boat has some impact on your boats EGT.

90% of our boating is in the Chesapeake Bay and further South as were in Key West for the winter again. I suspect guys further North and in the Great Lakes might well have lower EGT because of the much cooler entering water and therefore closer to the lower 900 EGT than Southern boaters.

Obviously you Northern guys are already in the barn for the winter but would be nice to see some entering water temperatures provided with your EGT next summer or now if you might have some info from this past summer. Certainly 60 EWT has to have an impact on EGT ?

Merry Christmas & Happy New Year to all!
John, to answer this, all I can tell you so far was that the Cummins guys (and even our Skipperbuds HUGE service center) hasn't heard of this problem. I brought it to their attention. So, I will be installing temp gauges, and let you know this summer. Mike
 
John, to answer this, all I can tell you so far was that the Cummins guys (and even our Skipperbuds HUGE service center) hasn't heard of this problem. I brought it to their attention. So, I will be installing temp gauges, and let you know this summer. Mike
The ambient water temperature will have very little/no effect on EGT's in the QSM11. The exhaust "shower head" is downstream in the exhaust system from the turbocharger; consequently, any cooling effect from the water being injected in the exhaust gas flow is well away from the EGT sensor. The turbocharger and exhaust manifold are dry, meaning they are not water jacketed and not subject to the engine cooling system temperature changes so nothing their to affect EGT's. Diesel engine characteristics do not lend to exhaust reversion like in a gasoline engine and the rotational inertia of the turbocharger further eliminates any possible chance of reversion; so, exhaust gasses would not reverse from the showerhead (wet cooled exhaust) back to the turbocharger and EGT sensor.
 
BDA76CA9-C13E-4A0F-85F3-4B2ABE6B3CF6.jpeg
Got the props back today from having some pitch taken out and having them tuned up. They are now 28” x 30”. Hopefully this gets me close to the 20gph fuel burn at cruise.
 
Look great, now do you run prop speed or equal coating on them to keep them top notch condition as I see you run predominantly in salt water as well?

I’ve been running prop speed since 2007 and find with the amount of fuel burn & hrs I run it’s well worth the added cost!
 
Look great, now do you run prop speed or equal coating on them to keep them top notch condition as I see you run predominantly in salt water as well?

I’ve been running prop speed since 2007 and find with the amount of fuel burn & hrs I run it’s well worth the added cost!
I have been looking at propspeed. Currently the rest of the underwater gear has cold galvanizing paint on it. The PO didn’t use the boat much last season and there wasn’t much growth on the running gear when I bought it in Oct with that paint.
How often do you have to reapply propspeed?
 
The ambient water temperature will have very little/no effect on EGT's in the QSM11. The exhaust "shower head" is downstream in the exhaust system from the turbocharger; consequently, any cooling effect from the water being injected in the exhaust gas flow is well away from the EGT sensor. The turbocharger and exhaust manifold are dry, meaning they are not water jacketed and not subject to the engine cooling system temperature changes so nothing their to affect EGT's. Diesel engine characteristics do not lend to exhaust reversion like in a gasoline engine and the rotational inertia of the turbocharger further eliminates any possible chance of reversion; so, exhaust gasses would not reverse from the showerhead (wet cooled exhaust) back to the turbocharger and EGT sensor.
How about cooler air? Cooler air in = cooler air out? Mike
 
How about cooler air? Cooler air in = cooler air out? Mike
Also unlikely due to the heat of compression from the turbocharger compressor and a difference in air temperature of say 50 degrees F is incidental with respect to the combustion in the cylinders. The only thing that the system would notice is denser air due to the cooler temperature of the aftercooler core when the water temperature is down, consequently you might see a very slight increase in performance but not any change worth discussion in exhaust gas temperature.
 
I have been looking at propspeed. Currently the rest of the underwater gear has cold galvanizing paint on it. The PO didn’t use the boat much last season and there wasn’t much growth on the running gear when I bought it in Oct with that paint.
How often do you have to reapply propspeed?

Keep your props out of sand and or anything else you should easily get two plus years and we put about 3 to 3500nms on ours per year. If ya got a dock Queen don’t bother so really depends on your useage IMHO.
 
Keep your props out of sand and or anything else you should easily get two plus years and we put about 3 to 3500nms on ours per year. If ya got a dock Queen don’t bother so really depends on your useage IMHO.

Thanks, we used the 340 about 100hrs a year so we are expecting a few more hrs this year with the larger boatbut the season is only so long. I will take a closer look at prop speed.
 
...How often do you have to reapply propspeed?

If you're not doing it yourself, it's important to have reputable shop apply it. I thought I used good shop (Norwalk Cove Marina) and the propspeed lasted only 1.5yrs. I stretched it to about 2 yrs mark, but based on my observation, for the remaining 4-6 months it wasn't affective and was wearing off more and more. I was expecting 2+ years, but in my case it was a wishful thinking.

I'll be using another shop or do it myself next time.
 
Does anyone know the LOA of the 50/52 Sedan with the factory extended hydraulic swim platform? The brochure lists the boat at 52’4” without the extended platform. Anyone know if that is with the anchor and roller as well what the extended platform adds?
 
Gary, my marina charges us for 52’ w/o a hydraulic platform so I’m guessing add 3’ to that number. Measured from the “pulpit” to the stern .
 
With the lift, it's about 56 1/2'. My tender hangs off a bit, and most marinas we visit measure us between 57 - 58'.
 
Also unlikely due to the heat of compression from the turbocharger compressor and a difference in air temperature of say 50 degrees F is incidental with respect to the combustion in the cylinders. The only thing that the system would notice is denser air due to the cooler temperature of the aftercooler core when the water temperature is down, consequently you might see a very slight increase in performance but not any change worth discussion in exhaust gas temperature.

Tom's way smarter than me but I can honestly say my EGT's are lower in late October vs early September on the Chesapeake.
 
I have a second set of props that I will have scanned but I believe they have pitch out already I just checked a photo of my gauges from the summer and at 1900 rpms I was burning 22gal/hr so I’m looking to bring that number down as mentioned.
 
Tom's way smarter than me but I can honestly say my EGT's are lower in late October vs early September on the Chesapeake.
Interesting - each state has a different fuel blend for summer and winter. Diesel can have anti-gelling additives in the winter. But, I can't see how that would affect EGT's... The ECM will change the fuel calibration based upon many parameters including air temperature, coolant temperature, and load which can affect EGT's. The only other thing I can think of is the turbo works harder the denser (cooler) the air consequently, it will take more heat out of the exhaust gasses to do that work. Maybe ask Tony at Seaboard Marine; he is "the" Cummins expert and would probably have answer.
 

Forum statistics

Threads
112,950
Messages
1,422,862
Members
60,932
Latest member
juliediane
Back
Top