Engine Cooling Systems for Snowmobiles

A snowmobile comprising:

• a forward frame assembly;
• a tunnel coupled to the forward frame assembly;
• a drive track system disposed at least partially below the tunnel, the drive track system including a track driveshaft having an axis of rotation;
• and
• a heat exchanger having a body with a forward wall, an aft wall, an upper end and a lower end, the upper end coupled to the tunnel, the lower end coupled to the forward frame assembly, the heat exchanger including an engine mounting assembly positioned on the forward wall between the upper and lower ends;
• wherein, the body has an arcuate section with a substantially constant radius of curvature and with a center of curvature proximate the axis of rotation of the track driveshaft, the arcuate section extending from the lower end of the body to at least the engine mounting assembly.

A snowmobile comprising:

• a forward frame assembly;
• a tunnel coupled to the forward frame assembly;
• a drive track system disposed at least partially below the tunnel, the drive track system including a track driveshaft having an axis of rotation;
• and
• a heat exchanger having a body including an upper housing with an upper end and a lower housing with a lower end, the upper end coupled to the tunnel, the lower end coupled to the forward frame assembly, the heat exchanger including an engine mounting assembly positioned on a forward side of the upper housing and a fluid port positioned on a forward side of the lower housing;
• wherein, the body has an arcuate section with a substantially constant radius of curvature and a center of curvature proximate the axis of rotation of the track driveshaft, the arcuate section extending at least between the fluid port and the engine mounting assembly.