ENGINE
Piston Ported Engine
When the piston opens the exhaust port, high-pressure
exhaust gases exit the exhaust port. (See Figure 68.)
Further movement of the piston towards the crankcase
uncovers the transfer port, which allows a fresh charge
of oil/fuel mixture to enter the combustion chamber. As
the exhaust gases continue to exit the exhaust port, the
engine is readied for another cycle. (See Figure 69.)
In a piston ported engine, there are no reed valves.
The fuel/air mixture enters the crankcase through a
third port that is opened and closed by the piston. (See
Figure 66.) All other functions are the same as a reed
valve engine.
Figure 66
A. Intake Ports Closed C. Third Port Closed
B. Compression D. Partial Vacuum
Figure 68
A. Intake Ports Closed C. Third Port Open
B. Exhaust Port Opening D. Pressure Building Up
3297-001-2
3297-003
Both Piston Ported and Reed Valve
Engines
At about 28 degrees before top dead center (BTDC),
the spark plug fires. When the engine is functioning
properly, the air/fuel mixture ignites, causing a burn
that occurs evenly through the power stroke. (If the
compression ratio is too high, the air/fuel mixture
actually explodes, which can be heard and is identified
as detonation.) The burn continues as the piston
changes direction and begins its travel towards the
crankcase. (See Figure 67.)
Figure 69
C. Fresh Fuel Change
D. Third Port Closed
3297-004
A. Intake Ports Open
B. Exhaust Port Open
The 2-cycle engine is always well lubricated as long as
the correct oil/fuel mixture is maintained in the fuel
tank. Oil suspended in the fuel vapor adheres to all
moving parts, keeping them continually coated,
regardless of operating angle.
Figure 67
A. Intake Ports Closed C. Third Port Open
B. Ignition D. Partial Vacuum
3297-002
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| Categories | Snow Blower Manuals, Toro Snow Blower |
|---|---|
| Tags | Toro 3650 GTS, Toro 38409, Toro 38412, Toro 38413, Toro 38414, Toro 38418, Toro 38419, Toro 38422, Toro 38424, Toro 38428, Toro 38429, Toro 38432, Toro 38433, Toro 38437, Toro 38438, Toro 38440, Toro 38441, Toro 38442, Toro 38445, Toro 38515, Toro 38516, Toro 38517, Toro 38518, Toro 38537, Toro 38538, Toro 38600, Toro 38601, Toro 38602, Toro 38603, Toro 38610, Toro 38611, Toro CCR 2400, Toro CCR 2400 GTS, Toro CCR 2450 GTS, Toro CCR 2500 GTS, Toro CCR 3000, Toro CCR 3000 GTS, Toro CCR 3650 GTS, Toro Power Max 6000, Toro Power Max 726TE, Toro Snow Commander |
| Model Number | 38412, 38418, 38413, 38419, 38422, 38424, 38440, 38428, 38429, 38432, 38433, 38437, 38438, 38439, 38440, 38441, 38442, 38445, 38515, 38537, 38538, 38600, 38601, 38602, 38603, 38610, 38611, 38419, 38516, 38517, 38518 |
| Model Year | 1999, 2000, 2001, 2002, 2004, 2005, 2007 |
| Download File |
|
| Document Type | Engine Service Manual |
| Language | English |
| Serial Number | 240000001 - 240999999 |
| Product Name | Toro Snow Commander Snowthrower |
| Product Brand | Toro. Customer Service Representatives are available by phone:
Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
Canada 1-888-225-4886 USA 1-888-384-9939, Snow Blower |
| Product Type | Snowthrower |
| Product Series | Single Stage, Single Stage Snow Commander |
| Swath | 24 inch |
| Discharge | Single Stage |
| Engine Manufacturer | Toro |
| Engine Oil Type | Toro 2 cycle / NMMA-TCW3 |
| Engine Motor Model # | R-tek |
| Engine Motor Size | 7 hp |
| Engine Motor Type | 2 Cycle EPA2 |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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