Author Topic: Cooling Fan for model I.C. Engines  (Read 6617 times)

Offline Brian Rupnow

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Re: Cooling Fan for model I.C. Engines
« Reply #30 on: July 09, 2014, 10:10:36 PM »
These two shots show the fan in the shroud, on a dummy shaft from the front and from the rear. The fan does not contact the inside of the shroud when the shaft is rotated. (Big sigh of relief!!)


Offline Brian Rupnow

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  • Barrie, Ontario Canada
Re: Cooling Fan for model I.C. Engines
« Reply #31 on: July 11, 2014, 02:49:42 PM »
This morning was show down time. I had finished the shroud and brackets for the fan yesterday afternoon, and painted the shroud. This morning I got up and added some set-screws to the fan hub, and made up a shaft and pulley for the fan. I was very fortunate in finding a rubber o-ring of the correct length, and the fan was installed on the engine. I am very pleased with the results, and the 2" diameter six bladed fan which is travelling approximately at twice the engine speed puts out a very noticeable breeze over the cylinder cooling fins. The engine exhaust is a bit smoky, because I was running some two cycle oil with the naptha fuel to provide lubrication for the Viton piston ring.--The oil to fuel ratio is 1:20, but I think I can safely cut that back to about 1:35 for future runs. The engine has a wet sump and splash lubrication of the con rod big end.