Different Engine Set Ups for a 31

[Hueso]

Throughout the years I've been collecting information from the Faithful of different engine set ups for a 31 and I wish to share it with you now. If you have different set ups that have work for you and/or want to fill in what I'm missing, please share.

YANMAR 315
Gears = 2:1
Shafts = 1.5 Aquamet 22
Props = 20 x 24 4 blade; 20 x 23 4 blade; 19 x 23 4 blade; 20 x 21 4 blade #7 cup

YANMAR 240
Gears = ?
Shafts = 1(3/8) Aquamet 22 a must
Props = ?

YANMAR 170
Gears = ?
Shafts = 1(3/8) Aquamet 22
Props = ?

STYER 256
Gears = ?
Shafts = 1(3/8) Aquamet 22
Props = ?

VOLVO 240
Gears = ?
Shafts = ?
Props = 18 x 22 4 blade

6BTA 260 CUMMINS
Gears = 1:5:1 (if ZF IRM 220A gears 1:53)
Shafts = 1.5 Aquamet 22
Props = 20 x 23 4 blade

6 BT 210 CUMMINS
Gears = 1:5:1 (Twin disc 1:54:1) (ZF63A)
Shafts = 1(3/8)
Props = 20 x 20 cupped

Cummins 250hp 6bta's
Gears = ZF220a 1.5:1
Shafts = 1 3/8" Aquamet 22 shafts
Props = 21"x 22"

270 Cummins 6BTA
Gears = 1:5 (ZF IRM 220A recommended; Twin Disc are also good) (Hurth 630-A 1.56 to 1)
Shaft = Aquamet 22
Props = 20 x 25 3 blade / "Most of us with the 250-270 6BTA Cummins run 21x22 or 21x23 three or four blades as the Cummins has more torque at lower rpm than the Yannies and will turn a bigger prop."

300 BTA CUMMINS (CPL 0970)
Gears = ?
Shafts = ? Props = ? ("there are some issues if they are run hard or overpropped")

[Pete Fallon]

Hueso,
Most of your info is correct, the first one is right on, the second uses Hurth 630A 1:5:1 gear 20x23 depending on the load. The third is a waste not enough power for a good cruise. The Styer's can use Hurth 630 A 1:5:1 can go down to 1-1/4" shafts, basically the same running gear as a big block gasser. The Volvos cost to much to maintain, forget a bout them.
The 260 Cummings I don't know anything about them. The 270 Cummins are a good engine for a 31, the 300 Cummins common rail are even better if you can still get them. If I had my choice I would go with the 300 Cummins for a Fly bridge or Sport fish model. The most common motors I see out there when doing my 31 Bertram surveys are the 300 Cummins in the Northeast area, down in Florida I see more Yanmars 315's.
Pete Fallon

[Marlin]

Wahoo
Cummins. QSB. 330 hp. Electronic /glen dinning controls bridge and cockpit
ZF 1:52:1 transmissions
1 3/4" aquamet 22shafts
Drip less shaft/rudder seals
20x23. 4 blade nibrel med cup props
Custom stainless struts
Custom stainless rudders
External water strainers( cleanable)
Capt Patrick crash pumps

[bob lico]

Why would you bring up cummins cpl 970 for a new installation? Rather silly comparing 1982 technology with present day . at least use cummins storm block era cummins 315 hp 2004 or newer. Two cummins 315 (330) hp is the eqivalent of 3 yanmar 315 hp in torque even more with QSB 330 hp.incidently the biggest northeast yanmar dealer mack boring just "thru in the towel" no rebuilding yanmar engines they or repair they just sell parts .

[wmachovina]

Bob, I think he was just cataloging past installations , those cpl 970s are probably still running.

[bob lico]

Ok past engine installation and there respective shaft dia. And prop. Specs.----- ok

[Hueso]

Bob:

Remember, this is information gathered throughout the years, and sometimes incomplete as you may appreciate. Feel free to share whatever info on set ups you may have.

[bob lico]

Cummins 315 hp recons which we all know are not recondition whats so ever,brand new with 7100 pump ran thru assembly line twice. 330 hp rated if you can keep fuel below 75 degree c no problem with 220 gallon tank. 11/2" aquanet 22 shaft,220IRM ZF gears at 1.53 ratio ,21"/24 pitch,3 huge blades then rake 5degrees and cupped around the entire blade.34 knot wot. Fully loaded 33 knot wot cruise 28 to 30 at 2350 rpm. Wot rpm is 2920 rpm.

[Hueso]

Bob:

Thank you for sharing!

[Tony Meola]

Huesso

The 270 Cummins, you can run 20x23 4 blade or go up to a 21 ince blade. I am running 20X23. 11/2 shaft. You can use pretty much the same balde on the 250 that you do on the 270. You have 1/3/8 for hte 250. Not sue but I think you would need to go to 1 1/2.

[wmachovina]

Tony, the 250s with 1+3/8 were on my Seachele31. Ran her for a few years w no problem. I was told that was the limit so got new aqua22 shafts no need for strut changes. Worked good.

[Carl]

Couple guys in my harbor run Perkins in their 31's with good results. One older was a smoker and another fairly new install. I recall nothing on the specs, cruise, shafts...nada. Nothing more to add but curious if anybody can fill in the blanks.

[Tony Meola]

Tony, the 250s with 1+3/8 were on my Seachele31. Ran her for a few years w no problem. I was told that was the limit so got new aqua22 shafts no need for strut changes. Worked good.

Bill

I had my struts bored out and used a thin wall bearing. I am running 1 1/2 aua shafts. I got lucky, we got them from a guy who was doing a rebuild and quit. They were brand new and he gave me a great price. We had to have them slightly cut down.

[ed c.]

Hueso, I have your # 1 setup, Yanmars with 20x23 4 blade props. There are 1700 hours on the engines, just finished the past month with 4 trips to the canyons off NJ. We average 132 gal per 30 or 36 hour trip.
Message to Bob Lico: Yanmar Co. speaks well of you

[bbtiller]

Question: My engines are specified as 6BT 5.9 250hp, not 6BTA.
Do I really have 210hp or 250?
There is no aftercooler

[bob lico]

Ed it is not a good subject i have better car accidents! Yelling ,screaming,distrust,making enemy from long time friends, and just plain telling people your boating season is over but oakdale yacth will do its best to track down the parts.sooner or later you become a rat!! and avoid the customer ,look at the calling number on the phone and don't pick up. " look you son of a bitch my friend got a turbo for his ancient 3116 for two grand why is the yanmar 6 grand ,or i don't mind paying DOUBLE but triple pisses me off. Why do suppose the biggest in the north threw in the towel? We avoid like the plague.