wyankee

Fan for a 1924 Stephens

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I believe a 1924 Stephens had a continental engine 6 cylinder.  I need a cooling fan as you can see someone has butchered this fan up and I am afraid it is out of balance.  I've tried matching them with tractor fans but was unsuccessful so any and all leads would be much appreciated. PM me or wyankee@hotmail.com

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You may not like my answer, though I would find a 6 plus bladed fan (possibly even a moden flex fan) and have a machine tool shop make you an adapter.   You would probably benefit from a few more blades and more modern technology. 

 

I generally use a automotive machine tool shop called Zakira's Garage  zakiras.com here in Cincinnati - they are pretty handy folks - if you can make a late 20's V-16 Miller race car engine from factory drawings you can pretty much do anything (usually Mike Yust) 

 

Sidenote:  About everything I have ever had either dad or i have upgraded the fan for touring reasons and when a fan is painted black generally no one ever notices.

 

All the above being said though, there should be some gu-ru of Stephens with an extra fan hanging on the garage wall - shame you do not need one for a 1934-36 Auburn or Flathead Cadillac as I have a large collection now.

Edited by John_Mereness (see edit history)

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Thank you for the responses. The biggest problem I have is the size of the center of the fan, as it covers a greased bearing. There is not a lot of space to make an adapter. 

 

 

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Was able to find a 6 bladed fan from a Farmall Model H tractor, much heavier but very well balanced.  Runs smooth on the engine but I do not know much about a flat belt and when we rev the engine the belt runs into the front of the engine.  If anybody has any good ideas on how to make the belt run true to the bottom pulley I would be interested in your suggestion.

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In general, a flat belt riding on two pulleys will run true to both if one of them has sufficient crown. Measure and modify as needed.   -   Carl 

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Thank you for the reply. Trying to measure the crown in the drive pulley was very difficult, may have to pull the pulley off I guess.

  

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You need alignment of top and bottom pulley, you need everything straight/parallel, and also helps to have a belt that is near the same width as one if not both pulleys. 

 

Good looking fan alternative !

Edited by John_Mereness (see edit history)

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DO NOT REMOVE THE DRIVE PULLEY. If you are having difficulty measuring, or RECOGNIZING crown, if any, figure there is none for now. No crown on either pulley indicates the belt was assumed to run true due to the deep channels on each pulley. In this case, as John says, precise alignment is extremely critical. First thing comes to mind is the huge amount of cantilever in the fan shaft. It can be complicated to diagnose this without being hands-on. BUT : Did you have some of this problem before you changed to the new fan ? In any case, I see that you have some skills at whittling metal. Machining some crown into the driven pulley should do the trick if all else fails, and carries no downside risk.   -   Carl 

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Zooming in on one of your later photos, clearly there is no crown on your driven pulley. Looks like you either sort out the alignment or whatever else the belt needs needs to stay put or do as Carl suggests and machine in a crown. I would do the former. 
 

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Thanks again for the reply's.

When it was apart I trued up the mounting bracket on the surface grinder, and made a bushing for the shaft, so I know that is square to the front of the engine. 

I was going to crown the upper pulley, but there just isn't enough material to do that. The owner of the car doesn't want to remove the lower pulley unless absolutely

necessary.

The next thing we're trying is a wider belt that will fit between upper pulley runners.

 

 

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Thank for your recommendations - we have a shorter, wider belt on there and it seems to be running nice and true.  See below! Thanks for all the help.

 

 

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