OldDan1943
Guru
- Joined
- Oct 2, 2017
- Messages
- 10,599
- Location
- USA
- Vessel Name
- Kinja
- Vessel Make
- American Tug 34 #116 2008
Yup all gauges in the 40 to 60 % range and all is perfect.
This is true with your car too.
This is true with your car too.
David and Ski, doesn't the Cummins(6 series) have a coolant cooled oil cooler? Does that help in what we are talking about? When everything gets up to 180 degrees I would think that would help. My little 4LH Yanmar had a seawater cooled oil cooler. I had a bitch of a time changing oil on that thing because I could never get the oil temp up to help the oil flow. That would not have been good to run that engine slowly all the time.
Let's face it, most folks buy used boats and live with the engine that came with it.
Repowering? We all home to sell the boat before that happens.
Anecdotal example: our 26-footer's 1998 260hp Volvo KAD44P diesel.Ski and David
Can only but agree with your posts 26 and 27. I'd add my confusion as to why Sinter states a marine after cooler increases the chances of glazing. Cooing the charge air would seem a positive in improving engine performance whether NA or Turbo with after cooler.
Todays common rail diesels do a very good job of controlling fuel under light load conditions. To the point sport fishing boats can fish for hours on end at near idle. Possibly Sinter wrote his comments a few decades ago.
And as Baker says, the coolant cooled oil coolers work well in keeping oil up to temperature under light loads. No mention by Sinter as to keeping oil temps up in the + 180F range.
Did he have trim tabs ?
I have twin, is 330s on the by Ocean Alexander 456, and loaded for a winter in the Bahamas which means cases of wine beer Gin, etc we can only get 11 or 12 kn out of our boat. Empty, she will do 15.
Perhaps if I threw the head of lettuce overboard we could make more speed.
My style hull had from 120 hp to over 200....sorry foget if it was a 250 Cummins or what from the factory.Not to ruffle any feathers , or get kicked off the Trawler forum , but has anyone ever heard of someone really loading up a trawler with a semi displacement hull with a lot of horse power ? I mean to really get it up and over . I have a 1979 ms 34 . This boat is new to me but have run many commercial fishing boats with almost the same hull (why I bought the 34 )and by not being speed demons ,we usually get up easy to 18 to 19 with a 380 hp with boat balanced correctly . Yes ,I am enjoying going slower and yes, I enjoy the fuel economy and no, I am not repowering . Just wondering if anyone did it and what was the result?
On a trawler, the vibration of a four cyl may push the choice to the smoother six. But there are not many low hp sixes out there unless you go to an obscure brand which creates its own problems.
So sometimes all things considered, the best (least bad) choice is to go with a larger engine in the trawler. The Deere 4cyl have balance shafts, so that that can be a good option.
Sunchaser wrote;
“And as Baker says, the coolant cooled oil coolers work well in keeping oil up to temperature under light loads. No mention by Sinter as to keeping oil temps up in the + 180F range.”
IMO if the lube oil temp is kept up to 180 and a heavy load is put on the engine every several hours for a few minutes one should be good to go.
BUT I seriously question if an engine coolant will keep the lube oil up to 180. That little cooler is going to replace the heat of a big fairly hard working engine? ..... but if it can ......
Perhaps it’s a solution to the underloading issue. I’m still glad I can run my engine at 50% load w/o too much fuel burn and w/o too much noise.
Not to ruffle any feathers , or get kicked off the Trawler forum , but has anyone ever heard of someone really loading up a trawler with a semi displacement hull with a lot of horse power ? I mean to really get it up and over . I have a 1979 ms 34 . This boat is new to me but have run many commercial fishing boats with almost the same hull (why I bought the 34 )and by not being speed demons ,we usually get up easy to 18 to 19 with a 380 hp with boat balanced correctly . Yes ,I am enjoying going slower and yes, I enjoy the fuel economy and no, I am not repowering . Just wondering if anyone did it and what was the result?
EGT? Is that exhaust gas temperature?
Not to ruffle any feathers , or get kicked off the Trawler forum , but has anyone ever heard of someone really loading up a trawler with a semi displacement hull with a lot of horse power ? I mean to really get it up and over . I have a 1979 ms 34 . This boat is new to me but have run many commercial fishing boats with almost the same hull (why I bought the 34 )and by not being speed demons ,we usually get up easy to 18 to 19 with a 380 hp with boat balanced correctly . Yes ,I am enjoying going slower and yes, I enjoy the fuel economy and no, I am not repowering . Just wondering if anyone did it and what was the result?
And as Baker says, the coolant cooled oil coolers work well in keeping oil up to temperature under light loads. No mention by Sinter as to keeping oil temps up in the + 180F range.
Eric....the coolant "cooled" oil is a good thing. In the Cummins it always comes up to temp and the oil comes up right along with it. In the Yanmar, the disparity was shocking.....the coolant could be 180 and the oil temp could be almost cool to the touch.
my addition may be pointless. I understand your concerns about too much engine.
I,m in that boat also.
Too much engine for my 32'er. My engine now is old (40yrs) v555 cummins @217 hp, yet it has done fine at 7 -8k. For the last 30 years. Originally powered to plane but cannot because we carry too much, er, stuff.
If you buy a boat with what you consider to be too much hp it doesn't mean it has to be used. Yes run it up for 10-15 minutes once daily on a long run to clean it up if concerned.
Not wot. Not needed. Just bring it up to a point where it is working harder on a slow plane or just on to the lower portion of the hump.
For a good normal cruise speed stay just below,10-15%, the hump speed , and it will be loaded sufficiently to be fully at operating temps which is what is important. That has also "derated" the engine.
As pointed out you will have a tad more mtc. With a seawater cooled after cooler but not that big deal unless ignored.
Stop worrying so much about the engine hp unless you are in the position to spec. Exactly what you want or do a repower. Just learn to run and maintain it smartly and whatever you have will serve well.
I strongly suggest you add one of the most important guages, egt. It will tell you ,with some experience, just how hard you are operation g the engine, overloading or easily.
Jmo.
Exhaust Gas Temperatureegt?
I have a 2007 Mariner Seville Pilot House 37 (Helmsman 38) which I bought in 2015. The PO had the Cummins QSB 5.9 re-programmed from 220 HP to 380 HP. He also has Bennett trim tabs. I guess he thought he might get her up on a plane, but at 40,000 lbs. fully loaded, no way was she ever going to plane. I can cruise at 7-8 knots on 3 GPM , but if I firewall it, I only get up to about 11-12 Knots but I am burning 17 GPM . I have had very few occasions where I pushed it that hard, other than to "blow it out" now and then. We do have some very strong tidal currents in my area, especially going through narrow passages against max flood/ebb, and actually needed the extra power, but I'm pretty sure boat would have been fine with the 220 HP configuration. Does anyone want to buy a set of used Bennett trim tabs? Or can anyone explain what possible good they are on an 8 Kt boat?
Sharpseadog: My days of working on engines ended a long time ago, so I generally stay out of these discussions, but I was wondering about a few things you have posted.
You noted:
"The PO had the Cummins QSB 5.9 re-programmed from 220 HP to 380 HP." I have never heard of anyone doing this. So he upgraded the turbo and coolers as well? I would assume this is a fairly extensive project and not just some programming.
" I guess he thought he might get her up on a plane, but at 40,000 lbs. fully loaded, no way was she ever going to plane." I don't think anyone who buys this boat expects to be on plane. The builder and many others like the 380 to get in the semi/displacement mode for some extra speed if they need it.
"But I'm pretty sure boat would have been fine with the 220 HP configuration." I think the builder would also agree with this. 250 is the standard power package, but many decide to upgrade. It could also help on resale.
"Can anyone explain what possible good they are on an 8 Kt boat? " I don't know either. No trim tabs on the new 43 that I ordered.