<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym19_1_1470925296451_2703">Hi All,</div><div id="yui_3_16_0_ym19_1_1470925296451_2703" dir="ltr">I am looking for a one cylinder water cooled diesel engine that will fit comfortably through a 18 inch dia opening. This seems a challenge--I can get air cooled engines all day long but can't find water cooled. </div><div id="yui_3_16_0_ym19_1_1470925296451_2703" dir="ltr">My only option is to then water cool an air cooled engine. Has anyone here tried that or have ideas. I was thinking to run copper tubing around the cylinder and head between the fins and also have a copper loop in the oil reservoir with water running through. </div><div id="yui_3_16_0_ym19_1_1470925296451_2703" dir="ltr">If the cylinder with fins was round I would simply machine the block and make a water jacket but no luck there.</div><div id="yui_3_16_0_ym19_1_1470925296451_2703" dir="ltr">Any ideas?</div><div id="yui_3_16_0_ym19_1_1470925296451_2703" dir="ltr">Hank</div></div></body></html>