[Silly Little Cars] Water-cooled Cushmans

[Charley]

Renzo,

I also have a truckster, but it has the OMC 22 hp engine, which is air cooled and has no radiator.

DC motors with permanent magnets for fields can be reversed by switching the power leads. For those with field coils instead of permanent magnets it's necessary to switch the field coil connections inside the motor to reverse them. Your link only refers to those motors with a field coil. If you aren't certain which type you have it's usually easiest to just try reversing the power leads and see what happens, or you can see if a paper clip will be magnetically attracted to the case of the motor with the motor not connected to power. If the paper clip is attracted, you have a motor with a permanent magnet field.

Is the insulation on the inside of your motor cover good? You might try adding some if it isn't. I've added pieces of 3/4" thick foil covered rigid foam to the inside of my engine cover using a tube of Permatex automotive weather-strip adhesive to attach it. Let the adhesive dry in the sun for a few hours after you have applied the insulation and before replacing the cover in the truck. So far this adhesive is holding very well for me. Be careful though, as the clearances inside the cover don't allow for the 3/4" thick insulation everywhere. You may need to use something thinner in some places, but be sure it's foil covered because the adhesive doesn't hold well to the non foiled insulation materials. I insulated my motor cover more to reduce the engine noise level than to reduce the heat in the cab, though I'm sure it will help with the heat problem too. The insulation that I used is available from Lowes in 4' X 8' sheets. It may also be available elsewhere. It is foil covered on one side and plastic covered on the other.

Charley
  ----- Original Message ----- 
  From: RENZO SEES 
  To: silly_little_cars at lists.sillylittlecars.com 
  Sent: Saturday, February 09, 2013 11:08 AM
  Subject: [Silly Little Cars] Water-cooled Cushmans


  Anyone ever install a 'pusher' electric radiator fan? Seems like a good idea during the hot season especially, in order to keep the cabin a little cooler. This would push air thru the radiator to the outside(instead of drawing air from outside into engine compartment and cabin.) I realize it may be slightly less efficient, but infinitely more comfortable and mine never overheats.
   BTW, just reversing polarity on fan motor doesnt change rotation.http://www.wisc-online.com/objects/ViewObject.aspx?ID=IAU9708


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