Caterpillar C27

{{One source|date=February 2017|engine article}}

{{Infobox automobile engine

| name = Caterpillar C27 {{cite web|url=http://s7d2.scene7.com/is/content/Caterpillar/LEHH0011|publisher=Caterpillar|year=2010|title=C27 ACERT Industrial Engine|accessdate=2017-04-21}}

| manufacturer = Caterpillar Incorporated

| aka =

| production = {{ubl|1983–2004 (as 3412)|2000- (as C27)}}

| predecessor = Caterpillar 34 series engine

| successor = Caterpillar C32

| configuration = Four-stroke V12

| displacement = {{convert|27|L|cuin|sigfig=4|abbr=on}}

| bore = {{convert|137|mm|in|sigfig=2|abbr=on}}

| stroke = {{convert|154|mm|in|sigfig=2|abbr=on}}

| block =

| head =

| valvetrain =

| compression = 16:1

| supercharger =

| turbocharger = Double

| fuelsystem = Unit injection (see management)

| management = Electronic (ACERT) with mechanical failsafe

| fueltype = Diesel

| oilsystem = Wet sump

| coolingsystem = Water cooled

| idle = 545

| redline = 2100

| power = {{nowrap|{{convert|783|kW|hp|sigfig=4|abbr=on}} @ 2100 rpm}} (marine/military rating)

| specpower =

| torque = {{nowrap|{{convert|4798|Nm|sigfig=4|abbr=on}} @ 1400 rpm}}

| length =

| width =

| height =

| diameter =

| weight = {{convert|3|t}}

| emissions level = Euro V or IMO IV

| emissions control = {{ubl|Exhaust gas recirculation|Selective catalytic reduction}}

}}

The Caterpillar C27 is a V12 diesel internal combustion engine made by Caterpillar. The engine is {{convert|27|L|cuin|sigfig=4}} in displacement. Each cylinder has a bore of {{convert|137|mm|in|sigfig=2|abbr=on}} and a stroke of {{convert|154|mm|in|sigfig=2|abbr=on}}. The engine can produce {{convert|500–1000|hp|kW|abbr=on|order=flip}} at 2100 RPM. The peak torque occurs at an engine speed of 1400 RPM.

This engine began production as Caterpillar 3412. As emissions control was tightened, engine management and combustion chamber is redesigned therefore two different engines emerged: the mechanically controlled C27 and electronically controlled C30. Caterpillar C30 block has been scaled up and C32 emerged. C27 also began to be produced with electronic engine control and management after 2007.