Home » Public Forums » GMCnet » I have a quiet fan that runs when needed.
| I have a quiet fan that runs when needed. [message #319560] |
Sun, 25 June 2017 18:52  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma:
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Senior Member |
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For some time, I have been consulting with others - mostly Tom Pryor about a better choice of fans and controls.
I now have a quiet fan that meets the coaches requirements. It is a 20" fan, so it does not fit it the stock horse collar fan shroud, so mine got replaced with a 2-piece that had to be modified, I won't miss that old thing at all. This fan is so quiet that start-up roar is all but gone and what noise it does make goes away fast. (This is one of the reasons I had to repair the exhaust system.) I know they are working on a better shroud and better ways to install it.
Well, Tom found the right part for a fan - it even goes the right way - But it needed some things. Even with these things, some of which Tom found or/and modified some of which Johnny Bridges assembled and they may have been others involved, but I was passed a few parts and acquired others on instruction. It is an electrically controlled viscous drive, so in needs a controller.
Remember the sub cooling issue I was having? That is gone. The fan does not even start until the thermostat is open. Even then, it only runs as long as it is needed. I added some instruments most of you don't have so I could watch the actual coolant out temperature and other stuff of interest to engine geeks. This was mod immediately impressive. Of course I did some stationary tests, but then I did some real road testing, but always close enough so I could limp home if needed. I never needed. On one of the early runs, I carefully did a highway run to heat soak the engine and then encountered an expected traffic jam at the entrance to a local water park. Yes, I did plan to get stuck in traffic on a 90°+ day.
It is quieter, that much I can promise, but I will not be able to publish any reliable fuel rate change for several months. Sorry about that.
So, I've go mine even as a Mark 1 Mod 0 I still love it. I don't when JimK will be able to supply a kit that normal humans (even GMC owners) can be find acceptable.
Until then, watch this board for the announcement.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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