Cooling System Mods

[jgrewe]

Basically you make grooves in the water jacket area around the spark plugs to increase surface area for water to get to.

[Barry Bordes]

Originally Posted by phoenix7

^^very good point BUT Mazda improved on the old rotary designs to minimize this damage in the newer (80's+) rotaries. It IS still possible though.

How would you "port" the housing to improve on the hot spots? I am not able to visualize the modification.

Originally Posted by jgrewe

Basically you make grooves in the water jacket area around the spark plugs to increase surface area for water to get to.

Most people do the Racing Beat fin mod around the sparkplug area. This is a big help. It adds surface area and flow turbulence.