| 3 Year Residential 1 Year Commercial |
This engine comes with a 3 year Residential and 1 year Commercial Use Warranty |
| Aluminum Alloy Die Cast Connecting Rod |
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.
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Automotive Collets and Forged
Steel Rocker Retainers
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Subaru SP Series engines use automotive quality collet valve retainers for longer life. |
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Camshaft with Automatic
Compression Release
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The camshaft and the sprocket are made of special sintered alloy and constructed
as a single piece. The camshaft is provided with intake and exhaust cam in one cam
lobe. The decompression release lever is mounted on the sprocket end side.
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| Component Location Cutaway |
The cutaway shows some common parts on the Overhead Cam SP engine series. |
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Cylinder Head 360 Degree
Cooling
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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.
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| Dual Ball Bearing Support |
Dual ball bearing crankshaft support offers maximum stability under demanding loads. |
| Hardened Steel Rocker Arms |
Hardened steel rocker arms with precision tappet adjusters are used for greater
durability and reduce service requirements.
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| High Efficiency Intake Port |
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.
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| Hot Spark Ignition System |
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.
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| Intake Valve Oil Seal |
Special machining on cylinder head allows the oil seal to be placed around the valve guide.
This seal reduces oil consumption and is replaceable for service.
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| Mounting Base Cooling Fins |
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.
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Optimized Capacity Rigid
Type Muffler
|
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.
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Patent Pending Breather
System
|
A patent pending breather system with a pre-separation
passage prevents oil from spouting, even if the engine is inclined. |
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Patent Pending Connecting
Rod Dipper
|
The SP Series lubrication system begins with a patent-pending oil scoop to project the
oil to the chain.
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Patent Pending Cylinder
Cooling Fins
|
Air is forced over the large slanted cooling fins on the cylinder for improved cooling
performance. This design is patent-pending.
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Patent Pending Main Bearing
Cover Design
|
An internally structured main bearing cover offers patent-pending technology by creating
a highly rigid engine system.
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Patent Pending Valve
Cover Design
|
A patent-pending valve cover design constantly supplies an optimum amount of oil to
the cam shaft and rocker arm even if the engine is inclined.
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| Pent Roof Design |
Overhead Cam (OHC) technology and the Pent-Roof combustion chamber allow the
Subaru SP 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.
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Special Cylinder Block
Cooling Fins
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Cooling fins are cast into both the inside and the outside of the crankcase to utilize every
possible cooling area.
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| Cast Iron Cylinder Liner |
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.
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| Forged Crankshaft |
Forged high-carbon steel crankshaft provides maximum reliability under demanding loads,
thus providing longer engine life. The drop forging process increases the strength and
durability of the crankshaft by re-aligning the molecules in the steel. This process hardens
the complete crankshaft. Most engines use cast-iron steel crankshafts.
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| NO Special Tools Needed |
Even though the SP series 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.
Most shop tools that small engine mechanics currently own, will also work on these engines
for service or complete tear down. Subaru engineers have achieved their commitment to 'keep it simple', while utilizing the latest technology.
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