EX Advantage Brochure
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EX A DVA N TAGE The EX Advantage. 40 years of superior operation and quality that’s second to none. Subaru’s EX Series engines offer unmatched performance, and rewrite the standards in ease of starting and quiet operation. With seven models ranging from 4.5- to 14-horsepower, Subaru EX Series engines prove superior to same class competitive engines. After all, it’s the first air-cooled engine line to use advanced, chain-driven EX13 EX17 EX21 EX27 EX30 EX35 EX40 overhead cam (OHC) technology to ensure more power, less noise and easy, one-pull starting every time. Subaru’s Feature Comparison Features Subaru EX Series – OHC Advantage Honda GX Series – OHV Y Year Introduced 2001 1984 (27 year old design) G O L Valve Train Design Chain-Driven Overhead Cam 80’s Style Overhead Valve O N Combustion Chamber Type High Efficiency Hemispherical Type Lower Compression Type ECH T Intake Port Design Straight Path Type Standard OHV Type CE Easy Start 30-40% Less Pulling Force Harder to Pull Start N A Sound Level 2 dbA Quieter Quieter than Most M R O F Power and Torque More Power and Torque in Each Class R E P Emissions Level Lower HC and NOx Emissions Low Emissions Cast-Iron Cylinder Liner Yes Yes Dual Ball Bearings Yes Yes High Quality Piston Rings Yes Yes Intake Valve Seal Yes No BI A Low Oil Level Sensor Yes Yes DUR LITY High Capacity Air Cleaner 12% Higher Dirt Holding Capacity High Capacity Cooling System Performance 20° F Cooler Oil Temperature Standard Cooling Warranty 3 -Year Warranty 3 -Year Warranty EX13 Honda EX17 Honda EX21 Honda EX27 Honda 70 82 (dBA) Subaru Robin EX17 EX Engines Advanced Technology Overhead Cam vs. Overhead Valve Optimized Combustion Chamber Why does it matter? Fewer Parts • Quieter • Longer Life Overhead cam (OHC) technology allows the intake and exhaust valves to be positioned for optimum engine performance. OHV systems restrict the placement of the valves and limit the efficiency of the combustion chamber. Chain-driven overhead cam design offers: Subaru OHC Valve Train Honda OHV Valve Train The illustrations below show the straight intake port on the right side of each picture. The low resistance to the flow of (1) Chain (1) Cam Gear the air/fuel mixture improves the power and efficiency, and decreases emissions. Overhead valve designs cannot match • Higher performance providing more power (1) Cam (2) Cams the optimum results achieved by the OHC design. • Easy start with less pulling force (2) Rocker Arms (2) Tappets (2) Valves (2) Push Rods • Low noise level (2) Rocker Arms • Fewer moving parts ensuring longer life (1) Valve Cap (2) Valves • Lower exhaust emissions • Decreased fuel consumption Subaru Overhead Cam Honda Style Overhead Valve Hemispherical Combustion Chamber High Efficiency Intake Port EX13 Honda EX17 Honda EX21 Honda EX27 Honda 70 82 (dBA) Subaru Robin EX17 EX Engines High Performance Easier to Start Lower Emissions What’s the benefit of Subaru’s advanced The higher efficiency of the overhead cam (OHC) mechanical decompression system? technology translates to less unused fuel emitted by the engine. Exhaust Emissions HC = NOx Easy Starting 4 kW Class Subaru EX With 30 to 40% less recoil pulling force than Honda, the Subaru • OHC – Improved combustion characteristics Honda GX engines provide a smooth, easy start. Sure, all engines start Subaru EX 6 kW Class Honda GX easily when they’re brand new. Subaru OHC engines continue to • Lower exhaust emissions start easily even after thousands of hours of use. 0 2 4 6 8 10 12 (g/HP-hr) • Reduced fuel consumption Pulling Force • Easily meets the latest EPA and CARB emission standards EX13 Honda GX EX27 Honda GX 0 3 6 9 12 15 (kgf) Compression Release Quieter Operation High Power & Torque What’s the benefit of 33% fewer moving parts? Overhead cam (OHC) technology and the hemispherical combustion chamber allow the Subaru EX engines to use a higher compression R educed Mechanical Noise ratio up to 9:1. Honda GX models use a lower 8.5:1 ratio. Subaru engines are a full 2 dbA quieter than competitive models. The noise reduction is most noticeable in the higher frequency range. What is the significance of a higher combustion ratio? Fewer Parts With fewer parts to wear and break, Subaru OHC engines outlast the competition. More Power A more powerful engine makes for more powerful and productive equipment. Noise/Frequency Measurement dbA 3m 60 Increased Efficiency 3,000 rpm Lower fuel consumption and efficient performance reduce operating costs. Honda GX160 Subaru Robin EX17 Operating dbA Levels Max Power EX13 EX13 Honda GX 2 dbA Honda GX EX17 EX17 Honda GX Honda GX EX21 EX21 High Compression OHC Design Honda GX Honda GX EX27 Honda GX EX27 20 Honda GX 70 82 (dbA) 00 20k 0 1 2 3 4 5 6 7 8 (kW) Hz EX Engines Maximum Durability Outstanding Cooling Performance Subaru EX Series engines’ head oil temp runs 20° F cooler than Honda. Excess heat is a primary factor in shortened engine life and engine failure. Constant heat causes oil viscosity breakdown which, over time, results in poor lubrication and reduced engine life. Here’s what makes Subaru different: SUBARU EX HONDA GX Head cooling is critically With an OHV design that important to long engine does not allow cooling life. The OHC design allows around the valve stems, for 360° airflow around Honda’s head running both the exhaust and intake temperature is higher. valve stem areas. Air is forced over the large Honda lacks large slanted cooling fins on the cylinder cooling fins, cylinder for improved diminishing the cooling cooling performance. ability of the engine. Quality Construction Subaru EX engines offer heavy-duty construction features: Design is patent-pending. • Cast-iron cylinder liner for longer life • Heavy-duty air cleaner system Cooling fins are cast into Crankcase cooling fins both the inside and the do not exist on the • Dual ball bearing crankshaft support • High quality float type carburetors outside of the crankcase to Honda model. utilize every possible cooling • Low oil level sensor and shut-off • An exclusive case-hardened steel timing chain area. The unique Subaru cooling Honda does not use system extends to the mounting base cooling, underside of the mounting further driving up head base. Air is forced over temperatures. special cooling fins at the bottom of the engine for maximum cooling. EX Engines Maximum Durability Filtration & Valve System Superior Lubrication System Air and fuel filtration is very important to long engine life. Subaru EX engines provide heavy-duty filter systems with Subaru EX engines utilize a unique and precise lubrication system to provide maximum engine life. high capacity for increased service intervals. Valve clearance adjustment is common on many overhead valve engines. The Subaru EX models utilize hardened steel rockers to reduce service requirements. Maintaining proper lubrication is very important. Particular attention needs to be given to the valve train and crankshaft rod journal. The difference is in the details: Here’s what sets the Subaru design apart: SUBARU EX HONDA GX SUBARU EX HONDA GX The large heavy-duty air A good quality two-stage The EX lubrication system Honda GX engine cleaner system uses a foam air filter system is available begins with a patent- lubrication uses a pre-cleaner over the densely with Honda GX engines. pending oil scoop to standard oil dipper. pleated paper filter. Testing project the oil to the chain. shows that the EX engines’ filter holds 12.5% more dirt than Honda’s. Accompanied by a filter A smaller fuel filter and Oil is carried by the chain to Honda engines utilize screen at the fuel tank fill opaque sediment bowl the overhead cam and valve a standard splash and a translucent sediment require removal to check train. Metering of the oil is lubrication system. for dirt. bowl before the carburetor, performed by a patent-pending Photo Not Available the Subaru EX fuel filter is system in the valve cover. twice the size of Honda’s. Automotive quality collet Critical engine damage Oil is circulated to the critical Honda uses only a typical, valve retainers ensure a is more likely with the rod journal on the crankshaft single oil hole on the longer life expectancy. less expensive, single with two lubrication holes in connector rod to circulate piece slip-on valve the rod. The journal radius oil. retainers used by Honda. is designed to allow high oil flow. Hardened steel rocker Clearance adjustments The Subaru oil sensor Replacement is difficult arms with precision are more frequent with uses a lever type float with a standard float tappet adjusters are Honda’s less expensive for greater durability. type sensor and no shut used for greater durability stamped metal rocker The sensor will pause 5 off delay. The gear cover and reduce service arms. seconds before shutting must be removed to gain access. requirements. off the ignition. History of Innovation Future of Excellence Subaru is a division of Fuji Heavy Industries Ltd., Advanced engineering, high technical expertise headquartered in Tokyo, Japan. Fuji is a global and state-of-the-art robotic manufacturing manufacturing company of diversified premium are hallmarks of Fuji, which proactively shares brand products. Total annual sales exceed technology between divisions in order to stay $13 billion. on the cutting edge, lead competition and provide customers with outstanding products. There are four main divisions: Subaru Automotive, Aerospace, Eco Technologies and the Industrial In recent years, Fuji has earned a worldwide Products Division. All divisions share a common recognition for technical advances in its Subaru history of innovation that brings added value to automobiles, such as Subaru’s All Wheel Drive the company’s premium products.