V-Twin          > Print chart
25HP / EH72 LP/NG
Performance Curve

Engine Overview:
Subaru EH72 25hp LP/NG is a keyed shaft V-Twin engine optimized to run on vapor withdrawal LP or natural gas. This engine is EPA and CARB certified for both stationary and portable applications.

Engine Family Overview:
Featuring eight models ranging from 20.5 to 40 horsepower, the V-Twin Cylinder Series Industrial Engines are the workhorses of the Subaru commercial grade engine line. This series provides maximum versatility offering models with horizontal or vertical PTO shafts, allowing engine use with an even greater variety of industrial and construction equipment. Compared to conventional side-valve engines, Subaru’s V-Twin provides smooth, reliable torque throughout the rpm range, improved breathing room at high rpm and low fuel consumption.

  Class Air-cooled, 4-Stroke, V-Twin cylinder, Overhead Valve, LPG/NG gas-fueled engine
  Shaft Horizontal, Keyed Shaft
  Cylinders 2
  Displacement 720
  Cycles 4
  Fuel LP/NG Vapor Withdrawal
  Max HP/RPM (Gross HP) LPG-(Propane content of 95% or higher) : 25hp/3600--Natural Gas (Methane content of 90% or equivalent) : 21hp/3600
  Bore x Stroke mm 84 x 65
  Starter Electric
  Dry Weight lbs 101.3
  Dry Weight kg 46
  Length inches (mm) 12.5 (317)
  Width inches (mm) 18.8 (477)
  Height inches (mm) 18.7 (475)
  Air Cleaner Dual Element
  Muffler (type) Optional
  Ignition System Hot Spark* Electronic Ignition
  Lube System Full Pressure--Spin-on Oil Filter
  Oil Sensor Low Oil Pressure
  Emission Rating EPA/CARB
  Color Black
  Governor System Mechanical Flyweight
  Fuel System Throttle Body LP/NG
  Crankshaft options Keyed or Taper
   Key Features & Benefits:
Cast-Iron Cylinder Liner Cast-iron cylinder liners enhance reliability and extend engine life.
Forged High-Carbon Steel Crankshaft Forged high-carbon steel crankshaft provides maximum reliability under demanding loads.
Large-Capacity Air Cleaner Element Large-capacity air cleaner with dual elements enhances reliability.
Oversized Ball Bearing Support Large main bearing support on PTO side of crankshaft minimizes shock under heavy loads.
Single Piece Aluminum Die-Cast Cylinder Block The configuration of the twin cylinder in the 90º (v-arrangement) offers compactness and is lightweight. Strong crankcase reinforcing ribs prove this engine is built with durability in mind.