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Short Diesels?

Short Diesels?

Short Diesels?

(OP)
I'm working for an engine dealer in New Orleans.  We are trying to supply repower for a few smallish crew boats, and have run into a problem with two of them.  The boats are aluminum, ~33 ft x 12 ft, and weigh ~10,000 lb.

The old engines were 8V-53s, which I'm guessing were rated a little above 200HP.  Two per boat.

We've got inline sixes that are powerful enough, but they're too long to fit, by a cylinder or two.  We've got turbo fours that will fit in the hole, but I don't think they're strong enough to get the boat up out of the water.

Scania makes an inline five that might fit; I'll check that next week.

Any other candidates come to mind?

  

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

(OP)
I almost forgot.  These engines will get serious service, probably > 3600 hours/ year, and much of it at full speed if not full power.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

Have you looked at Yanmar? They seem to be built well, are very reliable and around the size you are looking for. They are very popular with the small sailboat guys.

RE: Short Diesels?

(OP)
All the Yanmar fours at ~200HP are "Pleasure Duty".  They wouldn't last a month with our customer.  

There seems to be a 'hole' in the market.  Nobody that I have found is making new ~8 liter Diesels in a V configuration...  but a fair number of boats are coming up for repower that originally had 6V or 8V engines, and were essentially built around the engine, so six in a row won't go in.






 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?


 Mike,
       Why not stay with the 8V-53's. There are stil many engine shops that can supply you with a rebuild unit and spares. They are indestructible those Detroit engines.

Offshore Engineering&Design

RE: Short Diesels?

chief that's a good idea.  Then you have no other big issues to hassle with.  You can charge less for more to your wallet and the customer will not have to even worry about anything going pear shaped in a conversion.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Short Diesels?

Just trying to locate information on the Nissan Marine Diesels under Chrysler Nissan and as I understand it now it's Volvo Nissan.

I was involved in the replacement of some Cat 453's with the Nissan. This was done to get more power in the same foot print. As I recall there was a about a 60 Hp gain in the same foot print. The engines were for some shrimp boats for service in the Caribbean. This is considered very hard duty on any engine. Two boats returned to the states after about 5 years with both engines in good shape. One had to under go a short overhaul because of a busted ring.
The Nissan in this service gave very good service without tender loving care.

There used to be ET member that had a nice website all about marine power.
  

RE: Short Diesels?

(OP)
The boats are being completely re-done from a bare hull, so they would need new engines anyway.

The 8V-53s may have been recycled already, or cut up; I don't know what happened to them.  

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

what's the length of those engines?
 

RE: Short Diesels?

Mike, how about the Cummins QSB4.5?

RE: Short Diesels?

(OP)
The Deere 4.5l four fits easily.  It's about 31" from belt guard to bellhousing flange.  The Cummins QSM 4.5 is roughly the same size, and comes in about the same range of ratings.  For _this_ customer, I'd only sell the fours with the lowest rating, i.e. ~110HP, which I don't think is enough for the boat.

The Deere 8.1l six doesn't fit, by about a cylinder.





 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

what about a 5.9L cummins?  too long?  
 

RE: Short Diesels?

(OP)
I'm guessing it is, but I'll check.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

(OP)
The 6BT5.9M might fit, if the customer didn't mind removing the engine to change the alternator belt.  I'm guessing they'd mind.  I would.



 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

(OP)
Hoo boy, those little sixes spin fast.  I bet they make a big mess when they blow up.

I'll look at them in more detail.



 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

(OP)
It looks like the Steyr six will fit.  I've asked the distributor if it's likely to live.  The 'monobloc' appears to be a vertically split crankcase, which is unusual in Diesels.  It's a little over 1120mm from front to transmission output flange.

The Volvo D4 four would fit, but I think we need a bit more power.

A lot of 'recreational' engines nominally have enough power, e.g. ~250HP, but for this customer, we need the 'commercial' rating, i.e., good for 100 percent power, 100 percent of the time, forever.


Oh.  I almost forgot.  How ungracious of me.  Thanks all, for all the help.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

Was just about to recommend a "boat stretcher".

Good luck in the repower.

RE: Short Diesels?

(OP)
Yeah, the boat stretcher would be great.  There are four boats.  We initially sold sixes for all four, based on someone's assurance that the boats are all the same.   

That someone was somewhat less than perfectly accurate.  

The forward engineroom bulkheads are in different locations in two boats.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Short Diesels?

(OP)
End of the story for now, and thanks again.

The customer was scared off by the Steyr's high rpm... which of course gives it adequate power in a small displacement and a small envelope.  

My estimates say the 230HP Steyr would max out at 25kt (@ 4200rpm) and cruise at 20kt @ 3700rpm.  So we quoted a 135HP Deere that will max out at 18kt @ 2600rpm, and cruise around 16kt.

Which wouldn't be a problem if the customer didn't already have two similar boats with Deere 8.1l sixes that make 26 and 28 kts.  They will always perceive the newer boats as slow pigs, and it will be the engine dealer's fault.

 

Mike Halloran
Pembroke Pines, FL, USA

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