The Boating Forum - Yanmar 6LPA-STP2 315hp

THE HULL TRUTH is the world's largest FREE network for the discussion of Boating & Fishing. Whether you're researching a new boat, or are a seasoned Captain, you'll find The Hull Truth Boating & Fishing Message Forum contains a wealth of information from Boaters and Sportfishermen around the world.




View Full Version : Yanmar 6LPA-STP2 315hp


JoshPtJudith
02-12-2010, 11:58 AM
Looking at a 1993 25' Luhrs w/ a 2008 Yanmar 6LPA-STP2 315hp motor in it. Was curious if anyone has any experience with this specific motor in this boat? Just curious to performance numbers/burn rate. Was told it would burn 8gph@ 27kts.. Ride/stability/etc if anyone has been on the boat or any experience with the motor, thanks.


boatmanalso
02-12-2010, 12:14 PM
Looking at a 1993 25' Luhrs w/ a 2008 Yanmar 6LPA-STP2 315hp motor in it. Was curious if anyone has any experience with this specific motor in this boat? Just curious to performance numbers/burn rate. Was told it would burn 8gph@ 27kts.. Ride/stability/etc if anyone has been on the boat or any experience with the motor, thanks.

I would doubt it... sounds like they are giving you the cruse speed and then the average fuel burn per hour. I can see where the boat could easily cruse up there and WOT might be up in the 30s. That engine probably couldn't burn 18 gph at wot.

jerseysportfisher
02-12-2010, 12:29 PM
I somewhat agree with boatman, but I really dont think its hitting 30 without sterndrive. If its a straight shaft i would say cruise 20-22 WOT 25-27.


jerseysportfisher
02-12-2010, 12:32 PM
just found this, even though twin 170's , much more realistic

http://www.yachtworld.com/core/listing/boatFullDetails.jsp?boat_id=1796984&ybw=&units=Feet&access=Public&listing_id=71011&url=

salvage master
02-12-2010, 12:46 PM
Yanmar has become the #1 choice in hi end repower there clean effecent and quiet i would have no doubt in a single 315 burning 8gph when new

I ran a 26 shamrock with a 250hp cummins that burned around 6 gph and had a top speed of 26.7 kts

You dont buy an inboard diesel boat to run WOT

JoshPtJudith
02-12-2010, 01:07 PM
Yeah, I thought 27kt cruise was high. It is a straight shaft, no outdrive

salvage master- At 80% of wot (recomended cruise) you would guess 8gph is accurate? (whatever cruise speed would be)

boatmanalso
02-12-2010, 01:29 PM
Yeah, I thought 27kt cruise was high. It is a straight shaft, no outdrive

salvage master- At 80% of wot (recomended cruise) you would guess 8gph is accurate? (whatever cruise speed would be)

they have fuel use charts. 80% throttle probably isn't 8gph. probably 12ish.

25Luhrs
02-14-2010, 09:46 AM
I am curious, has anyone run the 25 Luhrs with either engine in it? or is this just speculation?

boatmanalso
02-14-2010, 09:56 AM
I am curious, has anyone run the 25 Luhrs with either engine in it? or is this just speculation?

Speculation for me...

I have a 38 footer with 330 hp volvo. Yesterday was 7.5 gph at 2200. LOL..I think... 17 mph

rat_catcher
02-14-2010, 12:29 PM
they have fuel use charts. 80% throttle probably isn't 8gph. probably 12ish.

Try this link;

http://www.yanmarmarine.com/theme/yanmar/uploadedFiles/engine_files/PDF/6LPA-STP2.pdf

From looking at the fuel usage chart, 80% throttle, which I would call 3,000rpm shows about 8.5gph.

rat_catcher
02-14-2010, 12:38 PM
WOT (3,800rpm) shows about 16.5gph.

RideSober
02-14-2010, 12:53 PM
I owned a 25 Luhrs with twin 170HP Yanmars for 2 seasons. My boat cruised at 25 MPH at about 75% of max, and got just about 2 MPG at cruise speed. WOT on the boat was about 30 +/- MPH or so. They are a huge 25' boat that feels much bigger and I always enjoyed fishing it on shorter runs. The problem was that having previously owned a 31' Fountain, the ride really was not as good in the open ocean as I had expected, and it just took too long to get out to the good offshore spots 40-50 miles out.

I liked the twin 170HP Yanmars and handling was not that bad with twins, but to me handling that big boat around the docks with a single inboard would be a challenge. Perhaps a bow thruster could help.

I also owned a 25' mod V single stern drive diesel Parker for several years. The single 220HP diesel Parker got much better fuel economy, but the Luhrs was heavier and rode a bit better than the Parker, but the ride was just a bit better. Good luck with your decision and hope this helps.

boatmanalso
02-14-2010, 01:16 PM
Try this link;

http://www.yanmarmarine.com/theme/yanmar/uploadedFiles/engine_files/PDF/6LPA-STP2.pdf

From looking at the fuel usage chart, 80% throttle, which I would call 3,000rpm shows about 8.5gph.

Yea, look at that. also at 3000,almost 500lbs of torque and makin about 175 hp. They get alot out of that little block. Maybe thats why Volvo gets so much life out of it. So much more is available... I forget already... 245 cubic in?

stringer bell
02-14-2010, 05:42 PM
The #s look right to me

finadict
02-14-2010, 07:03 PM
There is a simple formula that is quite accurate for diesele consumption, Total hp x >05 X percent of load. so for the boat in question it would be 315 X .05 = 15.75 x .8 =12.6 gph.

cuure67
02-15-2010, 05:54 AM
I have a 26' Strike with a 240 turbo Perkins. Cruise 20-23 knots 2300 rpm with about 6-8 gph.
WOT 2600rpm 14gph. Boat weight around 7500 pounds.

25Luhrs
02-15-2010, 07:31 AM
RideSober is accurate with the data & boats performance. My 1993 25 Luhrs with twin Yanmar 170's paired with KM5A 2:1 reduction gears & turning 18 x 24 Michigan DQX 4 blade props with a medium cup performed:

Cruise 3100 - 3200 24.5 knots - 26.3 knots ; WOT 3350 29.5 knots; running 600 off the top 22 knot cruise. The average fuel consumption at cruise was a combined 14 gallons per hour + / - conditions. Boat holds 196 gallons of fuel.

There were 4 adults on the boat, 1/2 fuel, no gear, moderate bay conditions. Recorded off installed Furuno NavNet GPS at sea trail.

The performance data for the 315 Yanmar will be added once the installation is complete. Basic setup 315 Yanmar paired with a ZF63A 2:1 reduction gear, 1 1/2 shaft, Michigan DQX 4 Blade 19 x 24 prop with medium cup (test prop). Boat holds 164 gallons of fuel.

TowBoatCaptain
02-18-2010, 02:11 PM
There was a lawsuit against yanmar for there motors dropping valves and 315's are one of them I run a 2002 290 luhrs and its in getting the heads done right now under yanmar's deal with their customers. You want to call your local yanmar dealer and see if these motors are part of the recall all they will need are the serial numbers or you can ask the existing owner if he ever brought it in. Good luck there great boats and ride good.

Sleeper
02-18-2010, 02:17 PM
You had to be the owner of the engine(s) in 2007 to be part of that settlement, it will not apply to the OP
---------------------------------------------------------------------------------------------------
The Class consists of all persons or entities who as of March 15, 2007, are current or former owners of Yanmar 6LP or 6LPA series engines manufactured by Yanmar between September 1996 and February 1, 2002, specifically including those which a) have a model designation of 6LP-STE, 6LP-STZE, 6LPA-STE, 6LPA-STZE, 6LPA-STP or 6LPA-STZP and b) bear a serial number in the range of 50101-53988 or M50001-51195.

25Luhrs
02-18-2010, 05:19 PM
Yes, I was aware of the issues. The model engine that I purchased is a 2009 315 SPT-2 model which should be allset as far as the valve issues goes.

25Luhrs
04-21-2010, 05:20 AM
The project has been completed and I am including the sea trial data that was recorded. These figures were done using a 21' x 23P (3) blade dyna jet propeller with no cup.

idle 4.3 knots ; 3400 rpm 25.7 knots ; 3600 rpm 26.9 knots ; 3900 WOT rpm 29.6 knots

The boat will be set up with a DQX 19" x 23P 4 blade prop with a # 3 cup. Based on the these numbers the cruise should be about the same or may bump up alittle bit.

Overall, the boat's performance is much better compared to the original gas engine. There is less tabbing required at cruise and the boat comes up & out of the hole quicker. There is no "squating" at lower speeds as well.

Manuverability is still a bit challenging but quick shifts correct the boats movement very easily.

The fuel saving should significant since the boat can run on plane at 2700 rpms so the 18 to 22 knot cruise will be nice and will sip fuel.

marlinmike
04-21-2010, 10:32 AM
I wouldn't think any yanmar 300-315 around today would have that issue still, plus he did say a 2008, which is fine.

25Luhrs
04-27-2010, 04:55 AM
Well here are the final numbers with the new prop, alittle better which is good. At least this makes you feel better after spending $$$$$ on a prop....

3400 rpm 25.7 knots; 3600 rpm 27.6 knots; 3900 rpm (wot) 30.2 knots (recored off a Garmin hand held GPS & fix mount Raymarine C80 GPS)

marlinmike
04-27-2010, 09:28 AM
Great numbers, perfect, enjoy!



Search Engine Friendly URLs by vBSEO 3.2.0