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Question for Matt Colie [message #323065] Thu, 31 August 2017 20:12 Go to next message
Jim Wagner is currently offline  Jim Wagner   United States
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Matt, I noticed on your signature it has "Electronically Controlled Quiet Engine Cooling Fan". Would tell us more about this
Thanks
Jim Wagner
Brook Park, oh
76 GMC500
71 Vega355
69 Vette383
Re: Question for Matt Colie [message #323096 is a reply to message #323065] Fri, 01 September 2017 08:14 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
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Jim Wagner wrote on Thu, 31 August 2017 21:12
Matt, I noticed on your signature it has "Electronically Controlled Quiet Engine Cooling Fan". Would tell us more about this
Thanks
Jim Wagner

Jim,

Sure I will.

I love it. But you probably would like more information than that.....
I also have a Digipanel that I use to track "Coolant Out". While the two have no electrical connection, the tracking is amazing. It is actually what one hopes to have. When the 210° bar comes on, the fan starts. It will run until the 200° bar fades. The ONLY time things have gotten hotter than I like (still not in dangerous territory) was down in Kentucky for the eclipse, it was a 98/98 day and we were stuck in traffic. I have my idle set at 350/400. Things did get hot. I asked Mary to bring the RPM up to 600/650 and that was all it took.

Some of you may know that I frequently consult with both Tom Prior and JimK about both problems and possible products.

For quite a while now, Tom has been searching for something to replace the stone age fan and late bronze age thermal clutch used in the typical GMC.
Well, Tom located a production fan with an electric hydraulic clutch (like the thermal clutch, but electrically controlled) that had the characteristics that would make it a good fit. Then, He, Johnny, JimK and I collected, assembled, fabricated and modified parts for a kit. Both Johnny and I fit them to our GMCs. I got mine going first (I think) and that was on a 98° day here in Michigan. I had checked things out carefully and included thermocouples for coolant in and out by pushing them under the clamps at the respective hoses. Then I took Chaumière for an eight mile highway run that I intentionally ended at the entry to a local waterpark as I knew that would cause a gridlock. I did have several recovery plans in place that were not needed at all. Even with my low idle, the peak temperature held for the 20+ minutes until I got loose and was able to move at 30MPH. At that point, the control returned to the system and the fan cycled as expected (hoped).

The new parts are a plastic ring fan and a two piece fan shroud that had to be cut to accommodate the 20" diameter. This was the shroud available at the time and while it may allow for some reversion, judging by the system performance this must not be much of an issue. There is also a temperature switch that installs where you take out the TVS (if you still have one), a control box, manual switch and an indicator light. The indicator light is kind of nice because I can't hear if the fan is engaged at low RPM.

If you have other questions, come see me and it at Elkhart.

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
Re: Question for Matt Colie [message #323098 is a reply to message #323065] Fri, 01 September 2017 08:30 Go to previous messageGo to next message
JohnL455 is currently offline  JohnL455   United States
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Why the idle at 350? At that speed I would think oil slinging off the crank would only be thrown about an inch above the rod big end and never get up to the walls or to cool the underside of pistons.

John Lebetski
Woodstock, IL
77 Eleganza II
Re: Question for Matt Colie [message #323116 is a reply to message #323098] Fri, 01 September 2017 15:49 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
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Registered: March 2007
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JohnL455 wrote on Fri, 01 September 2017 09:30
Why the idle at 350? At that speed I would think oil slinging off the crank would only be thrown about an inch above the rod big end and never get up to the walls or to cool the underside of pistons.

John,

I have seldom decided where I wanted an engine to idle. I always let them tell me. This engine does not like 600~650 and the 1100 to set the timing even less so.

While you concern about lubrication and cooling is understandable. Think about the fact there there is no load on the engine and no BMEP contributing heat to the system. There should still be adequate lube on the cross-head and such low cylinder temperatures, and just the charge air can cool the crowns. A thermocouple in the exhaust stream will read a high temperature because there is not much boundary layer to make it shed the heat even with the engine running so expansively.

Also consider that 360 rpm (close enough) is still 6 revolutions a second and with the high lube oil pressure it is usually showing, I am not worried. If I am wrong, I will know it before the end of October.

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
Re: Question for Matt Colie [message #323173 is a reply to message #323065] Sat, 02 September 2017 12:01 Go to previous messageGo to next message
JohnL455 is currently offline  JohnL455   United States
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Registered: October 2006
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At 360 RPM no need for a tach. You can just count the balancer rotations for 10 secs and multply by 6. I don't think it will like the 1 scenario where you pull off an exit ramp and catch a stoplight.

John Lebetski
Woodstock, IL
77 Eleganza II
Re: [GMCnet] Question for Matt Colie [message #323176 is a reply to message #323173] Sat, 02 September 2017 12:34 Go to previous messageGo to next message
k2gkk is currently offline  k2gkk   United States
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Isn't the function of the little TVS (Thermal Vacuum Switch) to increase idle RPM when engine heats up? Sounds to me as if GM designers once again had their heads on straight!


D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com


________________________________
From: Gmclist on behalf of John R.Lebetski
Sent: Saturday, September 2, 2017 12:01
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Question for Matt Colie

At 360 RPM no need for a tach. You can just count the balancer rotations for 10 secs and multply by 6. I don't think it will like the 1 scenario where
you pull off an exit ramp and catch a stoplight.
--
John Lebetski
Woodstock, IL
77 Eleganza II


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Re: [GMCnet] Question for Matt Colie [message #323192 is a reply to message #323176] Sat, 02 September 2017 16:26 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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Senior Member
k2gkk wrote on Sat, 02 September 2017 13:34
Isn't the function of the little TVS (Thermal Vacuum Switch) to increase idle RPM when engine heats up? Sounds to me as if GM designers once again had their heads on straight!

D C "Mac" Macdonald

Mac,

Yes, it was, but it was more to allow the low idle for emissions than to help cooling. In the current iteration, I am using the hole where the TVS was for the fans temperature switch. I believe I will come up with a better answer in the future.

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
Re: Question for Matt Colie [message #323193 is a reply to message #323173] Sat, 02 September 2017 16:29 Go to previous message
Matt Colie is currently offline  Matt Colie   United States
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
Senior Member
JohnL455 wrote on Sat, 02 September 2017 13:01
At 360 RPM no need for a tach. You can just count the balancer rotations for 10 secs and multply by 6. I don't think it will like the 1 scenario where you pull off an exit ramp and catch a stoplight.

John,

Six revolutions a second is a little like watching a 1911 slug go to the end of an indoor range. You got to have much younger eyes than I do.

We had one time in the 98/98 at Paducah that was a concern, so Mary just leaned on the go peddle a little for 30 seconds.

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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