A snowmobile has a frame including a tunnel, a least one ski operatively connected to the frame, a seat disposed above the tunnel, a fuel tank disposed on the frame, and an engine connected to the frame forwardly of the fuel tank. The engine has at least one cylinder, at least one intake port, at le
A snowmobile has a frame including a tunnel, a least one ski operatively connected to the frame, a seat disposed above the tunnel, a fuel tank disposed on the frame, and an engine connected to the frame forwardly of the fuel tank. The engine has at least one cylinder, at least one intake port, at least one exhaust port, and a laterally extending output shaft defining an output shaft axis. An endless track is disposed at least in part under the tunnel and is operatively connected to the engine. An air intake system is fluidly connected to the at least one intake port. An exhaust system is fluidly connected to the at least one exhaust port. The exhaust system includes a muffler disposed between the output shaft axis and the fuel tank in a longitudinal direction of the snowmobile.
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1. A snowmobile comprising: a frame including a tunnel;a least one ski operatively connected to the frame;a seat disposed above the tunnel;a fuel tank disposed on the frame;an engine connected to the frame, the engine being disposed forwardly of the fuel tank, the engine having at least one cylinder
1. A snowmobile comprising: a frame including a tunnel;a least one ski operatively connected to the frame;a seat disposed above the tunnel;a fuel tank disposed on the frame;an engine connected to the frame, the engine being disposed forwardly of the fuel tank, the engine having at least one cylinder, at least one intake port fluidly communicating with the at least one cylinder, at least one exhaust port fluidly communicating with the at least one cylinder, and a laterally extending output shaft defining an output shaft axis;an endless track disposed at least in part under the tunnel and being operatively connected to the engine;an air intake system fluidly connected to the at least one intake port; andan exhaust system fluidly connected to the at least one exhaust port, the exhaust system including a muffler, the muffler being disposed between the output shaft axis and the fuel tank in a longitudinal direction of the snowmobile, the muffler passing through a vertical plane containing a longitudinal centerline of the snowmobile. 2. The snowmobile of claim 1, wherein the muffler is completely disposed between the engine and the fuel tank in the longitudinal direction of the snowmobile. 3. The snowmobile of claim 1, wherein the at least one exhaust port is disposed on a front of the engine and the at least one intake port is disposed on a back of the engine. 4. The snowmobile of claim 3, further comprising: a laterally extending countershaft defining a countershaft axis;a continuously variable transmission having a driving pulley connected to the output shaft, a driven pulley connected to the countershaft, and a belt transmitting power from the driving pulley to the driven pulley; anda drive axle defining a drive axle axis and being operatively connected to the countershaft and the endless track;wherein the exhaust system further includes an exhaust pipe having an inlet fluidly communicating with the muffler and an outlet fluidly communicating with atmosphere; andwherein the outlet of the exhaust pipe and the continuously variable transmission are disposed on a same side of the longitudinal centerline of the snowmobile. 5. The snowmobile of claim 3, wherein at least a portion of the air intake system is disposed between the engine and the muffler in the longitudinal direction of the snowmobile. 6. The snowmobile of claim 1, wherein the at least one exhaust port and the at least one intake port are disposed on a front of the engine. 7. The snowmobile of claim 6, further comprising: a laterally extending countershaft defining a countershaft axis;a continuously variable transmission having a driving pulley connected to the output shaft, a driven pulley connected to the countershaft, and a belt transmitting power from the driving pulley to the driven pulley; anda drive axle defining a drive axle axis and being operatively connected to the countershaft and the endless track;wherein the exhaust system further includes an exhaust pipe having an inlet fluidly communicating with the muffler and an outlet fluidly communicating with atmosphere; andwherein the outlet of the exhaust pipe and the continuously variable transmission are disposed on a same side of the longitudinal centerline of the snowmobile. 8. The snowmobile of claim 1, wherein the fuel tank is disposed on a front of the tunnel. 9. The snowmobile of claim 8, further comprising a heat shield disposed between the fuel tank and the muffler. 10. The snowmobile of claim 1, further comprising: a laterally extending countershaft defining a countershaft axis;a continuously variable transmission having a driving pulley connected to the output shaft, a driven pulley connected to the countershaft, and a belt transmitting power from the driving pulley to the driven pulley; anda drive axle defining a drive axle axis and being operatively connected to the countershaft and the endless track;wherein the countershaft axis is disposed between at least a portion of the muffler and the output shaft axis in the longitudinal direction of the snowmobile. 11. The snowmobile of claim 10, further comprising a reduction gearing operatively connecting the countershaft to the drive axle; and wherein the reduction gearing and continuously variable transmission are disposed on opposite sides of the longitudinal centerline of the snowmobile. 12. The snowmobile of claim 10, wherein the muffler is disposed between the countershaft axis and the drive axle axis. 13. The snowmobile of claim 1, wherein the at least one exhaust port is disposed on a front of the engine; and the exhaust system further includes: a tuned pipe fluidly connected to the at least one exhaust port; andan exhaust conduit fluidly connecting the tuned pipe to the muffler. 14. The snowmobile of claim 13, wherein the tuned pipe has: an inlet;a first portion connected to the inlet, the first portion extending from the inlet forwardly and laterally in a first direction from the inlet;a second generally U-shaped portion connected to the first portion, the second portion extending forwardly from the first portion, then laterally in a second direction across a longitudinally extending line passing through the inlet, the second direction being opposite the first direction, and then rearwardly; anda third portion connected to the second portion, the third portion extending rearwardly and laterally in the first direction from the second portion to an outlet of the tuned pipe, the third portion extending across the longitudinally extending line passing through the inlet;wherein the exhaust conduit is connected to the outlet of the tuned pipe; andwherein the exhaust conduit extends rearwardly from the outlet of the tuned pipe to the muffler. 15. The snowmobile of claim 1, wherein the exhaust system further includes an exhaust pipe having an inlet fluidly communicating with the muffler and an outlet fluidly communicating with atmosphere; and wherein the outlet faces downwardly and is disposed between the output shaft axis and the fuel tank in the longitudinal direction of the snowmobile. 16. The snowmobile of claim 1, wherein the exhaust system further includes an exhaust pipe having an inlet fluidly communicating with the muffler and an outlet fluidly communicating with atmosphere; and wherein the outlet of the exhaust pipe is disposed laterally between lateral sides of the engine. 17. A snowmobile comprising: a frame including a tunnel;a least one ski operatively connected to the frame;a seat disposed above the tunnel;a fuel tank disposed on the frame;an engine connected to the frame, the engine being disposed forwardly of the fuel tank, the engine having at least two cylinders, at least two intake ports fluidly communicating with the at least two cylinders, at least two exhaust ports fluidly communicating with the at least two cylinders, and a laterally extending output shaft defining an output shaft axis;an endless track disposed at least in part under the tunnel and being operatively connected to the engine;an air intake system fluidly connected to the at least two intake ports; andan exhaust system fluidly connected to the at least two exhaust ports, the exhaust system including a muffler, the muffler being disposed between the output shaft axis and the fuel tank in a longitudinal direction of the snowmobile,each of the at least two cylinders having a cylinder axis;at least a portion of the muffler being disposed between two longitudinally extending vertical planes;one of the two longitudinally extending vertical planes containing one of the cylinder axes; andanother one of the two longitudinally extending vertical planes containing another one of the cylinder axes. 18. The snowmobile of claim 17, wherein the muffler passes through a vertical plane containing a longitudinal centerline of the snowmobile. 19. The snowmobile of claim 17, wherein the muffler is completely disposed between the engine and the fuel tank in the longitudinal direction of the snowmobile. 20. A snowmobile comprising: a frame including a tunnel;a least one ski operatively connected to the frame;a seat disposed above the tunnel;an engine connected to the frame, the engine being disposed forwardly of the fuel tank, the engine having at least one cylinder, at least one intake port fluidly communicating with the at least one cylinder, at least one exhaust port fluidly communicating with the at least one cylinder, and a laterally extending output shaft defining an output shaft axis; a drive axle operatively connected to the output shaft and defining a drive axle axis;an endless track disposed at least in part under the tunnel and around the drive axle, the endless track being operatively connected to the drive axle;an air intake system fluidly connected to the at least one intake port; andan exhaust system fluidly connected to the at least one exhaust port, the exhaust system including a muffler, the muffler being disposed between the output shaft axis and the drive axle axis in a longitudinal direction of the snowmobile, wherein the muffler passes through a vertical plane containing a longitudinal centerline of the snowmobile. 21. The snowmobile of claim 20, wherein the muffler is completely disposed between the engine and the drive axle axis in the longitudinal direction of the snowmobile. 22. The snowmobile of claim 20, wherein the at least one exhaust port is disposed on a front of the engine and the at least one intake port is disposed on a back of the engine. 23. The snowmobile of claim 22, wherein at least a portion of the air intake system is disposed between the engine and the muffler in the longitudinal direction of the snowmobile. 24. The snowmobile of claim 20, wherein the at least one exhaust port and the at least one intake port are disposed on a front of the engine. 25. The snowmobile of claim 20, wherein: the at least one cylinder is at least two cylinders;each of the at least two cylinders has a cylinder axis;at least a portion of the muffler is disposed between two longitudinally extending vertical planes;one of the two longitudinally extending vertical planes contains one of the cylinder axes; andanother one of the two longitudinally extending vertical planes contains another one of the cylinder axes. 26. The snowmobile of claim 20, further comprising: a laterally extending countershaft defining a countershaft axis; a continuously variable transmission having a driving pulley connected to the output shaft, a driven pulley connected to the countershaft, and a belt transmitting power from the driving pulley to the driven pulley, wherein the drive axle is operatively connected to the countershaft; and wherein the countershaft axis is disposed between the muffler and the output shaft axis in the longitudinal direction of the snowmobile. 27. The snowmobile of claim 26, further comprising a reduction gearing operatively connecting the countershaft to the drive axle; and wherein the reduction gearing and continuously variable transmission are disposed on opposite sides of the longitudinal centerline of the snowmobile. 28. The snowmobile of claim 26, wherein the muffler is disposed between the countershaft axis and the drive axle axis. 29. The snowmobile of claim 20, wherein the at least one exhaust port is disposed on a front of the engine; and the exhaust system further includes: a tuned pipe fluidly connected to the at least one exhaust port; andan exhaust conduit fluidly connecting the tuned pipe to the muffler. 30. The snowmobile of claim 29, wherein the tuned pipe has: an inlet;a first portion connected to the inlet, the first portion extending from the inlet forwardly and laterally in a first direction from the inlet;a second generally U-shaped portion connected to the first portion, the second portion extending forwardly from the first portion, then laterally in a second direction across a longitudinally extending line passing through the inlet, the second direction being opposite the first direction, and then rearwardly; anda third portion connected to the second portion, the third portion extending rearwardly and laterally in the first direction from the second portion to an outlet of the tuned pipe, the third portion extending across the longitudinally extending line passing through the inlet;wherein the exhaust conduit is connected to the outlet of the tuned pipe; andwherein the exhaust conduit extends rearwardly from the outlet of the tuned pipe to the muffler. 31. The snowmobile of claim 20, wherein the exhaust system further includes an exhaust pipe having an inlet fluidly communicating with the muffler and an outlet fluidly communicating with atmosphere; and wherein the outlet faces downwardly and is disposed between the output shaft axis and the drive axle axis in the longitudinal direction of the snowmobile. 32. The snowmobile of claim 20, wherein the exhaust system further includes an exhaust pipe having an inlet fluidly communicating with the muffler and an outlet fluidly communicating with atmosphere; and wherein the outlet of the exhaust pipe is disposed laterally between lateral sides of the engine.
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