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Thermostat Rotax 582

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ronko(at)att.net
Guest

Posted: Wed Dec 11, 2013 7:47 am Post subject: Thermostat Rotax 582

Pulsar friends,

  

 Well its winter and with temperatures below freezing and air density way up, the air speed is up as well.

  

 But, here I am again, duct tape over half of the 2 radiators to get the coolant temperature up to normal.  What I don't understand or need confirmation on my theory is, the thermostat definitely stays closed at cold start up, then it opens somewhere between 140-150 degrees, then it seems to just stay open and if I didn't block so much of the radiators, the gauge would show coolant down near 100-110 degrees.  Why doesn't the thermostat pinch off the flow to keep it around 140-150 degrees which seems to be its norm, once it starts flow through the radiators?  Note, I am well aware of the dangers of shock cooling in a 582 and whether it is summer of winter, I never take off until I know the thermostat is open.

  

 I assume that the thermostat does not operate well as a regulator, but works more like an on/off switch.  In addition to acting like a switch, I believe that it takes an extreme drop in coolant temperature before it closes again. Comments?

  

 It would be nice to find some way to control this better, but maybe there are reasons, this is the way these things work.

  

 Best regards,

  

 Ronko

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kulpa(at)att.net
Guest

Posted: Wed Dec 11, 2013 7:57 am Post subject: Thermostat Rotax 582

Ron,



The Thermostat has built in hysteresis so that it doesn't chatter (lack 

of a better word).  This means that it opens at 140-150° and closes at 

some lower temperature, probably around 100°.  The higher the open temp 

the higher the close temp so you might look at replacing your existing 

with a higher temp thermostat, something around 180°.



Best Regards, Bill



On 12/11/2013 9:46 AM, Ron Koval wrote:

 	  Quote: 	
		   Pulsar friends,

 Well its winter and with temperatures below freezing and air density 

 way up, the air speed is up as well.

 But, here I am again, duct tape over half of the 2 radiators to get 

 the coolant temperature up to normal.  What I don't understand or need 

 confirmation on my theory is, the thermostat definitely stays closed 

 at cold start up, then it opens somewhere between 140-150 degrees, 

 then it seems to just stay open and if I didn't block so much of the 

 radiators, the gauge would show coolant down near 100-110 degrees.  

 Why doesn't the thermostat pinch off the flow to keep it around 

 140-150 degrees which seems to be its norm, once it starts flow 

 through the radiators?  Note, I am well aware of the dangers of shock 

 cooling in a 582 and whether it is summer of winter, I never take off 

 until I know the thermostat is open.

 I assume that the thermostat does not operate well as a regulator, but 

 works more like an on/off switch.  In addition to acting like a 

 switch, I believe that it takes an extreme drop in coolant temperature 

 before it closes again. Comments?

 It would be nice to find some way to control this better, but maybe 

 there are reasons, this is the way these things work.

 Best regards,

 Ronko

 *



 *

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kdpalmer(at)mweb.co.za
Guest

Posted: Wed Dec 11, 2013 8:29 am Post subject: Thermostat Rotax 582

Ron,

        You should check which side  the heat sender unit is, in relation to

the thermostat, which could cause this big variation of temp ?



K'd

RPE - Skunkworx

--

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ccoulter(at)wavecable.com
Guest

Posted: Wed Dec 11, 2013 11:18 am Post subject: Thermostat Rotax 582

My 912 does not have a thermostat.



Clarke



On Wed, 11 Dec 2013 07:46:55 -0800 (PST)

  Ron Koval <ronko(at)att.net> wrote:

 	  Quote: 	
		   Pulsar friends,

  

 Well its winter and with temperatures below freezing and 

air density way up, the air speed is up as well.

  

 But, here I am again, duct tape over half of the 2 

radiators to get the coolant temperature up to normal.  

What I don't understand or need confirmation on my theory 

is, the thermostat definitely stays closed at cold start 

up, then it opens somewhere between 140-150 degrees, then 

it seems to just stay open and if I didn't block so much 

of the radiators, the gauge would show coolant down near 

100-110 degrees.  Why doesn't the thermostat pinch off 

the flow to keep it around 140-150 degrees which seems to 

be its norm, once it starts flow through the radiators?  

Note, I am well aware of the dangers of shock cooling in 

a 582 and whether it is summer of winter, I never take 

off until I know the thermostat is open.

  

 I assume that the thermostat does not operate well as a 

regulator, but works more like an on/off switch.  In 

addition to acting like a switch, I believe that it takes 

an extreme drop in coolant temperature before it closes 

again. Comments?

  

 It would be nice to find some way to control this 

better, but maybe there are reasons, this is the way 

these things work.

  

 Best regards,

  

 Ronko

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ronko(at)att.net
Guest

Posted: Wed Dec 11, 2013 12:15 pm Post subject: Thermostat Rotax 582

Bill,

  

 I would like to try a 10 degree hotter thermostat, but don't know how to find one that would fit.  I don't know if it would be as simple as pulling the thermostat out of my blue head 582, taking it to the Napa Auto Parts warehouse store, and seeing if they can find one the same physical size but 150 or 160 degree.

  

 Thanks for your the feedback.

  

  Ron

 

    

From: Bill Kulpa <kulpa(at)att.net>

To: pulsar-list(at)matronics.com 

Sent: Wednesday, December 11, 2013 9:56 AM

Subject: Re: Thermostat Rotax 582



 

--> Pulsar-List message posted by: Bill Kulpa <kulpa(at)att.net (kulpa(at)att.net)>



Ron,



The Thermostat has built in hysteresis so that it doesn't chatter (lack of a better word).  This means that it opens at 140-150° and closes at some lower temperature, probably around 100°.  The higher the open temp the higher the close temp so you might look at replacing your existing with a higher temp thermostat, something around 180°.



Best Regards, Bill



On 12/11/2013 9:46 AM, Ron Koval wrote:

 	  Quote: 	
		   Pulsar friends,

 Well its winter and with temperatures below freezing and air density way up, the air speed is up as well.

 But, here I am again, duct tape over half of the 2 radiators to get the coolant temperature up to normal.  What I don't understand or need confirmation on my theory is, the thermostat definitely stays  closed at cold start up, then it opens somewhere between 140-150 degrees, then it seems to just stay open and if I didn't block so much of the radiators, the gauge would show coolant down near 100-110 degrees.  Why doesn't the thermostat pinch off the flow to keep it around 140-150 degrees which seems to be its norm, once it starts flow through the radiators?  Note, I am well aware of the dangers of shock cooling in a 582 and whether it is summer of winter, I never take off until I know the thermostat is open.

 I assume that the thermostat does not operate well as a regulator, but works more like an on/off switch.  In addition to acting like a switch, I believe that it takes an extreme drop in coolant temperature before it closes again. Comments?

 It would be nice to find some way to control this better, but maybe there are reasons, this is the way these things work.

 Best regards,

 Ronko

 *

 ;   * The Builder's Bookstore htref="http://www.mypilotstore.com/" ace Consulting http://wwnbsp;                    ==============


	


 [quote][b]

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ronko(at)att.net
Guest

Posted: Wed Dec 11, 2013 12:28 pm Post subject: Thermostat Rotax 582

Keith,

  

 My heat sender unit is in the middle of the blue head, centered right between the 2 cylinders, adjacent to the thermostat, which I believe flow wise, is heading out to the hoses, either to the hose heading back to the pump if the thermostat is closed or shared with the radiators if the thermostat is open.  Therefore, I would think the coolant temperature reading is close to the hottest temperature of the system (not the temperature of return at the pump.

  

 Should the temperature sender unit be somewhere else?

  

 Ron

 

    

From: Keith Palmer <kdpalmer(at)mweb.co.za>

To: pulsar-list(at)matronics.com 

Sent: Wednesday, December 11, 2013 10:29 AM

Subject: RE: Thermostat Rotax 582



 

--> Pulsar-List message posted by: "Keith Palmer" <kdpalmer(at)mweb.co.za (kdpalmer(at)mweb.co.za)>



Ron,

        You should check which side  the heat sender unit is, in relation to

the thermostat, which could cause this big variation of temp ?



K'd

RPE - Skunkworx

--

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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