"Cé hé sin" (michael-m-mouse)
02/27/2015 at 16:07 • Filed to: Seven cylinder
3
7|
"Cé hé sin" (michael-m-mouse)
02/27/2015 at 16:07 • Filed to: Seven cylinder | 3
| 7 |
One from Wartsila:
One from MAN B & W
!!! UNKNOWN CONTENT TYPE !!!
One from Mitsubishi
And one (the only four stroke) from Valtra
The Valtra was designed to make use of their existing three and four, the others are modular designs so more power needed=more cylinders. Sometimes fourteen of them.
kanadanmajava1
> Cé hé sin
02/27/2015 at 18:55 |
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The last one is not a Valtra engine. It's made by AGCO Power (formerly known as Sisu Diesel) but Valtra tractor brand uses their engines. Now both companies belong to the large AGCO corporation so you aren't totally off.
AGCO Power engines are still mostly made in Finland but they have now factories in South America and China building slightly different engines for local markets. AGCO Power engines aren't very modern in construction but they are really tough and reliable workers.
The company I work for does emission certification tests for AGCO Power and their engines are fairly commonly visiting in our facility. Sadly I have witnessed their inline-7 running only once.
Wärtsilä is a Finnish company too.
DavidHH
> Cé hé sin
02/28/2015 at 15:25 |
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The question is why do they make modular inline ship engines with 3 to 7 cylinders?
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Cé hé sin
> DavidHH
02/28/2015 at 16:08 |
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They do 7 to 14 cylinders as well. Because it's modular. Same bore and stroke, same pistons, same conrods, same valves, same heads etc. If you want more power, just add a cylinder or seven.
Note that the last engine I showed is actually used on dry land in farm machinery. Same applies though.
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DavidHH
> Cé hé sin
02/28/2015 at 16:38 |
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I thought that the biggest container ship engine is a I7 with electronic valves, that they build the ship around?
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Cé hé sin
> DavidHH
02/28/2015 at 17:35 |
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Have a Wartsila RTA 96C inline 14. 1,820 litres per cylinder, 108,000 bhp (but only 4.25 bhp/litre) at 102 rpm. It's a two stroke, to go astern you stop it and restart it in the opposite direction.
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DavidHH
> Cé hé sin
02/28/2015 at 21:42 |
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I'll have to tell a friend who is an ex-Navy wrench. That reverse is weird, but efficient if it has electric valves, since it must be direct drive then. Thanks
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Cé hé sin
> DavidHH
03/01/2015 at 05:32 |
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You can get reversible four strokes as well, they have a separate reverse camshaft.
The other alternative would be to have a reverse gear which is expensive given the torque involved.
Some ships use electric drive which makes things simpler.
Top trivia: it can take half a day to start a really big marine engine from cold because you have to heat it up first.