1. Main Data and Outputs
The Wärtsilä 31DF is a 4-stroke, non-reversible, turbocharged and intercooled diesel engine
with direct fuel injection.
310 mmCylinder bore ........................
430 mmStroke ...................................
2 inlet valves, 2 exhaust valvesNumber of valves .................
8, 10, 12, 14 and 16Cylinder configuration .........
50°V-angle .................................
Clockwise, counterclockwiseDirection of rotation .............
720, 750 rpmSpeed ...................................
10.32 - 10.75 m/sMean piston speed ...............
1.1 Maximum continuous output
Table 1-1 Rating table for Wärtsilä 31DF
Generating setsMain enginesCylinder
configuration
750 rpm720 rpm750 rpm
Generator [kVA]Engine [kW]Generator [kVA]Engine [kW][kW]
52804400509042404400W 8V31DF
66005500636053005500W 10V31DF
79206600763063606600W 12V31DF
92407700890074207700W 14V31DF
1056088001018084808800W 16V31DF
The mean effective pressure Pe can be calculated as follows:
where:
mean effective pressure [bar]Pe =
output per cylinder [kW]P =
engine speed [r/min]n =
cylinder diameter [mm]D =
length of piston stroke [mm]L =
operating cycle (4)c =
DBAE248994 1-1
1. Main Data and OutputsWärtsilä 31DF Product Guide
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