underpower?

[abrahamzt]

i almost buy a350 sundancer 2008 with yanmar 306
is it underpower?
wish range i would have?

 

[techmitch]

How many horse power is the yanmar 306, are there 2 of them and where is Yes located.

 

[abrahamzt]

are two of them and are 306hp

 

[David Morgan]

For a single 300 hp Diesel figure on about 8-12 GPH at planing speeds.

 

[northern]

If it had 454s before you have less HP.

 

[Hampton]

If it had 454s before you have less HP.

Not necessarily true. HP is torque times RPM. Compare the Yanmar HP and the 454 (or other) HP at the same RPM. Bet the Yanmar is much better except maybe in the big block's sweet spot. The comparison won't really work that well because the big blocks will run up to 4600 RPM and the Yanmar's likely will churn much slower.

Bottom line: Diesels have a lot more torque. Gas engines make HP by cranking up the RPM before the torque curve drops off. There won't be many examples of diesels in this boat except from other foreign enthusiasts.

The range will probably be over 200 NM or 300 Km. The range is about 180 NM in big block gas engines, and the diesels are bound to run more efficiently, though I don't have any hard data.

 

[autovette]

For a single 300 hp Diesel figure on about 8-12 GPH at planing speeds.

How do you make that calculation?:huh:

 

[melida]

Hi
One of my father's boat is 2004 360DA(395) with twin YANMAR 306 HP v-drives. They are indeed 315 hp.
It plans app. 3000rpm and cruises at 17-20 knots according to sea load bottom conditions and burns 30-35 liters(8-9 gallons) each engine and wot 30-32 knots burns 60liters each engine.
So your boat is smaller then ours and you'll get better number also if you have stern drive very very better numbers would be.
Best regards.

 

[abrahamzt]

thank you very much for the advices, i bought the boat, it seem tha wiill be a litle slower than gas

 

[Hampton]

thank you very much for the advices, i bought the boat, it seem tha wiill be a litle slower than gas

Congrats. If it's slower than gas, it'll cost about 1/2 to operate.

 

[autovette]

For a single 300 hp Diesel figure on about 8-12 GPH at planing speeds.

Still looking for the calculation that will allow me to compute GPH at planing speed. Thanks

 

[Woody]

Go to the Yanmar site. They have specs on alot of their engines. I don't know exactly which one you have but here is an example. Note the performance graphs including fuel burn rates.

www.yanmarmarine.com/theme/yanmar/uploadedFiles/engine_files/PDF/6LPA-STP2.pdf

 

[David Morgan]

How do you make that calculation?:huh:

Personal experience.

You can also buy the Propeller Handbook which provides the formulas for getting pretty close estimates. The book does more than calculating the correct propeller size.

http://www.amazon.com/Propeller-Han...=sr_1_1?ie=UTF8&s=books&qid=1263225453&sr=8-1