Discussion in 'Downeast Engine Room' started by BillD, Nov 2, 2017.
John Deere Rolls Out Trio of Marine Engines
smaller footprint....less weight
This might have been a nice fit in our old 28 Berts, eh Bill?
"It delivers a 40 percent increase in power and a 9 percent reduction in total engine weight for a 53 percent increase in power density" - the way of the world, but hopefully it runs like a Deere should and gives Yanmar some good competition.
315hp at 2,800rpm's is low revving for a little 4 cylinder, and impressive hp #'s. I like how Deere keeps it's RPM's lower than the competition, and they advertise the SAE horsepower rating. Deere has a really good thing going in the marine propulsion market.
Dear Cummins..Are you seeing this...
I agree, I have a friend with a 28' Bertram that has Volvo's with transmissions that have been problematic. It won't be too long before he is looking at a re-engine or sell the boat.
I was wondering when they were going top make a sea water after cooled version of that engine. They are more efficient in that configuration also.
They wouldn't come close to fitting in a 28 Bertram, too tall. On the heavy side also.
4 cyl motors are fine, But I'll take the inherent smoothness of a 6 cyl with a 3 plane crank over a 4 any day!
True, but it I am looking on building a budget 30ish footer that 4cyl ME looks good. Now if we could disclose the pricing.
Having owned a Bert 28 for 17 yrs and repowering the old Ford Mercs with new Crusader 5.7s...I'm not confident you'd get the 4 banger JDs to fit either height wise, bottom wise or weight wise.
Not to derail this thread, but I always thought a pair of Yanmar 8LV's would be good in a Bertram, if they didn't cost so much.
Bill - I thought they might be competing with Yanmar 4 bangers but apparently that is not the case if they are that much larger in size.
Yanmar and John Deere have a different customer base and focus. Yanmar's focus is on the light weight rec user, Deere is more commercial and heavy duty rec user. Both have their intended uses. 315hp out of a 4.5L commercial rated engine is pretty impressive for Deere, and about 1,200lb bobtail. The 315hp Deere would make a nice engine for a 26'-30' Downeast, love the low 2,800rpm redline for a smaller displacement engine.
now that the Yanmar 4LHs are gone by.........gas 5.7s are the choice for a 28 Bert
Is the base engine made by Deere, or does Deere buy it from someone else?
At 1300 lbs it kinda seems just like the rest of the JD engines other than maybe the operating range, isn't it? A Cummins 6.7 doesn't weigh that much more and would be a 6 cylinder and very turned down to only be making 315 HP, or on the opposite end could be making 550 HP at the same weight, right?
The John Deere is 315 hp @ 1230 pounds. The QSB6.7 is 1450 pounds. Depending on the hull that 220 pounds can be a big difference. The John Deere is making 315 hp at it's M6 rating which I couldn't find a duty cycle for M6 but M5 is 300 too 1000 hour's a year, and .5 @ WOT per 8 hours. The Cummins @ 350 hp is rated medium continuous which I couldn't find Cummins duty chart but it would basically be "run it forever at wide open you can't hurt it". I haven't even looked at The torque yet. The other thing to compare would be price which good luck trying to get that.
The new 4.5L Deere is 315hp at the M5 rating, that rating is up to 1,000hrs per year. And you are correct, the bobtail weight is 1,230lbs.
Link: 4045SFM85 | Marine Propulsion Engine | John Deere US
Footprint plus the 200 lbs wold probably be two things to make a huge difference I guess; JD looks quite a bit smaller, some freedom for mounting with balance versus where it happens to fit in a smaller boat.
Ya, after posting I thought about the foot print as well. It is my go to for a budget 30CB/32 Holland... pending price.
That's why I should finish my coffee before I post. No wonder I couldn't find a M6 rating!