Short Diesels?

[MikeHalloran]

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

 

[gerhardl]

OK. My first try was way out of size. But Volvo Penta?

Nearing something sensible?

http://vppneuapps.volvo.com/ww/PIE/...0-15-56-29&t=PDF1P&a=7747376&p=T416&d=Product

Bulletins&s=131694&id=2385&lang=en-US

 

[MikeHalloran]

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

 

[unclesyd]

Was just about to recommend a "boat stretcher".

Good luck in the repower.

 

[MikeHalloran]

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

 

[MikeHalloran]

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