1. Main Data and Outputs
The Wärtsilä 31 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 valves
Number 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 31
Generating setsMain enginesCylinder
configuration
750 rpm720 rpm750 rpm
Generator [kVA]Engine [kW]Generator [kVA]Engine [kW][kW]
58564880566447204880W 8V31
73206100708059006100W 10V31
87847320849670807320W 12V31
102488540991282608540W 14V31
1171297601132894409760W 16V31
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 =
Wärtsilä 31 Product Guide - a1 - 18 October 2016 1-1
1. Main Data and OutputsWärtsilä 31 Product Guide
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