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Overhead Cam
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9.5 HP

Features & Benefits:
EX30 Engine Components > View larger image
The cutaway cross-sectional view shows some of the major components of the EX30 engine.

Dual Ball Bearing Crankshaft Support > View larger image
Dual ball bearing crankshaft support offers maximum stability under demanding loads.

Spheroidal Graphite Cast-Iron Crankshaft > View larger image
The crankshaft is made of spheroidal graphite cast iron, and the crank pin is high-frequency induction hardened. Both the crank sprocket used to drive the chain, and the gear used to drive the governor gear, are pressed on the output end of the shaft.

Cast-Iron Cylinder Liner > View larger image
Cast-iron cylinder liners enhance reliability and extend engine life. The cast iron cylinder liner has much better wear characteristics than the softer aluminum that surrounds it, making engine life much longer than if the piston is in contact with the aluminum cylinder wall.

Case-Hardened Steel Timing Chain > View larger image
Case-hardened steel timing chain allows for precision timing and maximum durability.

High Power Pent-Roof Design > View larger image
Overhead Cam (OHC) technology and the Pent-Roof combustion chamber allow the Subaru EX engines to use a higher compression ratio of 9:1. The higher compression ratio increases the power produced for a given size engine. It also improves efficiency and overall performance.

High Efficiency Intake Port > View larger image
The illustration shows the straight intake port on the right side of the picture. The lower resistance to the flow of the air/fuel mixture improves the power, efficiency and lowers emissions. Overhead Cam (OHC) technology allows the intake and exhaust valves to be positioned for optimum performance.

Automotive Collets and Forged Steel Retainers > View larger image
Subaru EX engines use automotive quality collet valve retainers for longer life.

Hardened Steel Rocker Arms > View larger image
Hardened steel rocker arms with precision tappet adjusters are used for greater durability and reduce service requirements.

Special Cooling Fins Cast Into Block > View larger image
Cooling fins are cast into both the inside and the outside of the crankcase to utilize every possible cooling area.

Mounting Base Cooling Fins > View larger image
The unique Subaru cooling system extends to the underside of the mounting base. Air is forced over special cooling fins at the bottom of the engine for maximum cooling.

Cylinder Head 360-Degree Cooling > View larger image
Head cooling is critically important to long engine life. The Overhead Cam design allows for 360-degree air flow around both the exhaust and intake valve stem areas.

Patent-Pending Connecting Rod Dipper > View larger image
The EX lubrication system begins with a patent-pending oil scoop to project the oil to the chain.

Patent-Pending Cylinder Cooling Fins > View larger image
Air is forced over the large slanted cooling fins on the cylinder for improved cooling performance. This design is patent-pending.

Aluminum Alloy Die-Cast Connecting Rod > View larger image
The connecting rod is a specially heat-treated aluminum alloy die-casting. Its large and small ends function as bearings. A splasher built into the connecting rod lubricates by splashing engine oil. The piston is an aluminum alloy casting with grooves for mounting compression and oil rings.

Patent-Pending Valve Cover Design > View larger image
A patent-pending rocker cover design constantly supplies an optimum amount of oil to the cam shaft and rocker arm even if the engine is inclined.

Patent-Pending Breather System > View larger image
A patent-pending breather system with a pre-separation
passage prevents oil from spouting even if the engine is inclined.

EX30 Cross-Sectional View > View larger image
This cross-sectional view shows many internal components of the EX30 engine.

Hot Spark Ignition System > View larger image
The ignition system is a transistor controlled magneto with the ignition timing set at 23 degrees before top dead center. The magneto consists of a flywheel and ignition coil. To ensure the easy startability of the engine, the step advancing ignition timing system is incorporated in the ignition coil. This system enables the engine to have basically two different ignition timings according to the engine speed.

Optimized Capacity-Rigid Type Muffler > View larger image
Optimized-capacity rigid muffler and 33 percent fewer moving valve train parts than OHV designs, reduce mechanical noise levels a full 2 decibels below competitive models.

NO Special Tools Required > View larger image
Even though the EX series of engines bring the latest technology, performance, and durability to the industrial air-cooled engine market, there are no special tools required to work on them. All the shop tools that most small engine mechanics currently own will also work on these engines for service or complete teardown. Subaru engineers achieved their commitment to 'keep it simple', while utilizing the latest technology.

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9.5 HP EX30
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