To be 4BY2-150 or not to be in favor of the 4BY2-180

N

No Worries

Active member
Joined
Sep 18, 2009
Messages
34
Fluid Motion Model
C-26
Vessel Name
No Worries
Hi all,

Does anyone have any info on the 180 HP version of the Yanmar in use on the R25-SC's. Worth the upgrade in power,reliability, cost of ownership, etc ?

Thanks, Carl
 
I don't think an 180 HP version is offered on the R25SC. If it were I would think there would be very little difference in economy or speed and no difference in maintenance.
 
Thanks Russ and Toni, I did not know there was but it is available for the asking but I believe the engine line is being changed at some point to Volvo. Don't quote me on it but I believe that to be correct. The 180 HP YanMar is the same 150 HP engine but it achieves the extra 30 HP via a fuel management system. I am gathering facts and trying to fill in the blanks in what I know about it. Thanks so much for your reply as well. 🙂 Carl
 
Hi all,

I am taking delivery of a used but new-to-me 2012 R25SC next week. It came with a 150 horse but was replaced after an engine failure with a 4BY2-180.

I will post complete results of the speeds, RPM's and fuel burn soon as I've been very curious about that as well. The owner reports 19.4 knots at WOT at 4070 RPM with full fuel, no water, 1 person on board and bottom paint but I don't know which way the tide was going. Prop was the standard issue that came with it at the 150 horse delivery.

More soon...

Rob from Seattle/Shilshole
 
Rob: If you know, is it possible for you to describe the details for the 4BY2-150 engine failure in the 2012 R25SC ? ... and from whom did you purchase the R25SC from ? If you prefer you may PM the info to me...Thanks... Barry
 
No Worries":24esy0bj said:
Thanks Russ and Toni, I did not know there was but it is available for the asking but I believe the engine line is being changed at some point to Volvo. Don't quote me on it but I believe that to be correct. The 180 HP YanMar is the same 150 HP engine but it achieves the extra 30 HP via a fuel management system. I am gathering facts and trying to fill in the blanks in what I know about it. Thanks so much for your reply as well. 🙂 Carl
Click to expand...

Our former R-25 came with the 150 HP engine. For a variety of reasons, it was upgraded to 180 HP. You are correct, it is done by reprogramming the Electronic Control Module (ECM). The ECM doesn't have to be swapped. With the correct equipment, a technician can reprogram it at dockside. The reprogrammed firmware optimizes the common-rail fuel injection to achieve greater HP.

We experienced an increase in power, but the change in full economy was marginal.

Cheers,

Bruce
 
Thanks all great discussion very much looking forward to the pending performance runs and fuel flow rate information from Rob great stuff :-!:-!:-!
 
No Worries":kup83xdf said:
Thanks all great discussion very much looking forward to the pending performance runs and fuel flow rate information from Rob great stuff :-!:-!:-!
Click to expand...

Quick correction. Rereading the thread I see you are referring to the Yanmar engine (we have one in our current R-29), but our R-25 had a Cummins. But, I believe the electronic control module is a similar technology. Sorry for my confusion.
 
Baz,

I thought I would post here instead of a PM as I'm sure everyone is interested. Keep in mind, this is second hand information from the current owner, Mike in Sequim (his ad is still on the for sale section here), and this is the mechanics best guess as he just removed the engine in Ketchikan and swapped it out for a brand new one and send the original back to Yanmar without ever getting back a tear-down report.

Anyway, the engine started belching smoke about 5 miles out of Ketchikan (after leaving from Washington State) and knocking loudly. The mechanic who did the engine change said it sounded like a wrist pin (connectiong rod to piston pin) had let go and it had broken off the fuel injector. I'm not sure which cylinder and they don't know why it happened.

Piston pin failures are extremely rare. I'm a professional mechanic and I've only seen one fail in my career. Broken injector failures are much more common and can THEN cause a piston or wrist pin failure, piston first, then again, still rare to fail the wrist pin.

Rob
 
Rob: Was this engine failure in a Yanmar 4BY2-150 or the 4BY2-180 ?
 
The failure was on the orignially installed Yanmar 4BY2-150.

I'm hoping to pick it up Friday!!! Hopefully the wind will settle a bit.
 
Captain Starbucks":3an928ms said:
The failure was on the orignially installed Yanmar 4BY2-150.

I'm hoping to pick it up Friday!!! Hopefully the wind will settle a bit.
Click to expand...

Congratulations... and good luck with the 4BY2-180 engine... nice upgrade to the R-25SC. 🙂
 
Awesome Rob looking forward to how your performance run details i ordered an R25-SC this morning and specified the 180 yanmar for the power
 
The failure to the original 4BY2-150 engine in that vessel happened in Alaska. If my memory serves me right it had failed from one of the old oil lines Yanmar has now replaced with the updated version. Bruce is correct about the engines. The cummins engine used to run in a 130 hp or a 150 hp with a $5,000.00 upgrade cost. Most common rail engines these days are that way. They make each one in a variety of different horse power.

The R25SC only comes with a 150hp engine. The only reason the boat in Alaska received a 180 hp engine was due to supply. The 180 was the only one available at the time. Same goes for No Worries. A difference in performance? Not much. The 150 and 180 engines are practically identical other than some computer changes. No pun intended but "no worries" on the difference of the engines. 😀
 
Thanks Andrew. We all love details and my new and bigger "no worries" is going to turn heads and get ooohs and ahhhhhs out in the harbor here in Newport RI. I always get a kick out of folks on mega yachts who come out and take pictures of my existing R21-ec. I imagine the same will hold true with the R25-SC. As always thanks for giving us the details. Carl
 
I was able to pick up the boat Friday and brought it by water from Sequim to Shilshole in Seattle. Good trip. Saturday I went out and wrote down some speed information as promised.

Wind: south at 15-20 kts
waves: south at 1-3 feet
tide: slack
Course: first west, then a 180 turn to east.
All speeds except WOT are taken trim tabs all the way up (as a baseline for everyone). All speeds measured in knots. The boat seems to be slightly underpropped at I understand the max RPM is supposed to be 4,000. I backed off the throttle at 4,200 and the boat was still accelerating westbound and actually felt like it was trying to fully plane. My course obviously wasn't exactly perpendicular to the wind and/or tides weren't fully slack.

RPM Speed West Speed east
Idle@ 810 3.5 3.0
1,000 4.0 3.5
1,500 5.8 4.8
2,000 7.0 6.2
2,500 8.0 7.4
3,000 9.7 9.0
3,500 12.6 12.0
WOT@ 4,200 19.4 18.0


Rob
 
Would like to see the MPG numbers added to the chart.
 
You must log in or register to reply here.

  • Tugnuts.com is the community hub for Ranger Tug, Cutwater, and Solara owners. Since its inception in 2008, the Tugnuts forum has grown into an active and thriving community of more than 9,000 members. It serves as both a meeting place for the best boating community online, and an invaluable archive of information.

  • User menu
Back
Top