Cooling jacket for exhaust valve and thermostat and cooling bottle

A coolant reservoir bottle configured to be placed within a vehicle cooling system, the coolant reservoir bottle comprising:

• the coolant bottle formed of first and second members, said first and second members defining a first chamber, said first member further forming a portion of a second chamber, said first chamber and second chamber being fluidly coupled through an aperture having a valve seat, said first chamber being configured to be fluidly coupled to a source of heated engine cooling fluid, said second chamber being fluidly coupled to an engine water pump;
• a thermally responsive actuator disposed within the first chamber, having a thermally actuated sliding member having a valve seat engaging surface, the thermally actuated sliding member being movable from a first open position when the coolant is below a first temperature to a second position closed position where the valve seat engaging surface is disposed against the valve seat when the coolant is above the first temperature.

A vehicle engine comprising:

• an engine head defining a fluid accepting cooling passage;
• and
• an engine block fluidly coupled to the engine head, said engine block defining a combustion chamber and exhaust ports and a first cooling path which branches into first and second paths, the first path surrounding the exhaust ports and the second path surrounding the combustion chamber, said first path passing cooling fluid head after passing the exhaust ports.