Engine upgrade

iris

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18 Mar 2002
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Hi,
I am trying to upgrade my engine and have been offered a westerbeke 12/15BTBD(63hp@4000rpm) engine with a ZF BW15V transmission.
Does anyone have any information on these.
The engine has been in use for 3500 hours at half designated engine speed (1800 rpm max).
What is the ratio of the transmission and how would I go about calculating boat speed etc.

Any help would be greatly appreciated.
 

PeterGibbs

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3 Sep 2001
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An engine of this size is good for a substantial vessel - 20 tonnes or thereabouts. Is this what you want and need? 4-6 HP per tonne is a good guide.

An angine offered as running only at half revs for its 3500 hr life sounds rather a tall one: was there a governor fitted or other reason why it was so under-loaded?

Some further thought seems appropriate to avoid disappointment.

PWG
 

vyv_cox

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16 May 2001
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France, sailing Aegean Sea.
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Transmission

ZF boxes are widely used but you will find that a range of ratios is possible. You should find a plate somewhere on the casing that gives this information, but if not it is not too difficult to measure yourself.
 
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