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Posted by Tim Nash (aka TMN) on July 20, 2008, 5:15 am
Please log in for more thread options > Tim Nash (aka TMN) wrote:
>
> > I sure by now most of us have =A0looked at
> >http://people.bath.ac.uk/ccsshb/12cyl/
>
> > I was looking at some documentation on the engine builders site and
> > came across this:
> > ". The cylinder liner wear rates are in the region of 0.02-0.03 mm/
> > 1000 hours maximum."
>
> > in the document:
> >http://www.wartsila.com/Wartsila/global/docs/en/ship_power/media_publ...
>
> > That equates to about 1 thou in 42 days - I don't now much about
> > internal combustion engines but that seems quite high. Is it because
> > of the large bore of the cylinders that the rings can cope with a
> > relatively large amount of cylinder and ring wear ?
>
> If you take 85mm as being the average bore of a car engine and 3 thou as =
a
> reasonable bore wear limit before reconditioning then you get 33 thou wea=
r
> limit or 33,000 hours running for the 965mm bore of the Sulzer. That equa=
tes
> to 3.7 years continuous running and container ships need to spend some ti=
me
> loading and unloading so probably over 4 years actual service. Well withi=
n
> their target of rebuilds every 2 to 3 years.
>
> Compared to a car engine that's a very low rate of wear. Even a well look=
ed
> after car engine is unlikely to see more than 5000 hours service. The Sul=
zer
> will undoubtedly have much better oil and air filtration systems than car
> engines do though. Most car engine wear is caused by what gets past the a=
ir
> filter or doesn't get removed from the oil. Truck engines with 500,000 mi=
le
> service lives also use much better filtration systems than cars.
> --
> Dave Baker
>
> ** Posted fromhttp://www.teranews.com**
Dave Baker said:
"4 years actual service. Well within
their target of rebuilds every 2 to 3 years."
OK - the figures make sense then - I thought that such a massive
engine would only be rebuilt every 10 years or so - but that was
a totally subjective figure. Guess I thought when you spend so much
money you don't have to worry about it for a long time !!! But seen in
light of the profits they must make its probably doesn't work out too
badly.
Tim
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> http://people.bath.ac.uk/ccsshb/12cyl/
>
> I was looking at some documentation on the engine builders site and
> came across this:
> ". The cylinder liner wear rates are in the region of 0.02-0.03 mm/
> 1000 hours maximum."
>
> in the document:
>