Today's Message Index:
----------------------
1. 07:47 AM - Thermostat Rotax 582 (Ron Koval)
2. 07:57 AM - Re: Thermostat Rotax 582 (Bill Kulpa)
3. 08:29 AM - Re: Thermostat Rotax 582 (Keith Palmer)
4. 11:18 AM - Re: Thermostat Rotax 582 (HUGH COULTER)
5. 12:15 PM - Re: Thermostat Rotax 582 (Ron Koval)
6. 12:28 PM - Re: Thermostat Rotax 582 (Ron Koval)
Message 1
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| Subject: | Thermostat Rotax 582 |
Pulsar friends,=0A-=0AWell its winter and with temperatures below freezin
g and air density way up, the air speed is up as well.=0A-=0ABut, here I
am again, duct tape over half of the 2 radiators to get the coolant tempera
ture up to normal.- What I don't understand or need confirmation on my th
eory is, the thermostat definitely stays closed at cold start up, then it o
pens 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 d
own 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 start
s flow through the radiators?- Note, I am well aware of the dangers of sh
ock cooling in a 582 and whether it is summer of winter, I never take off u
ntil I know the thermostat is open.=0A-=0AI assume that the thermostat do
es 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?=0A-=0AIt w
ould be nice to find some way to control this better, but maybe there are r
easons, this is the way these things work.=0A-=0ABest regards,=0A-=0ARo
nko
Message 2
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| Subject: | Re: 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:
> 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
> *
>
> *
Message 3
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| 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
-----Original Message-----
From: owner-pulsar-list-server@matronics.com
[mailto:owner-pulsar-list-server@matronics.com] On Behalf Of Bill Kulpa
Sent: Wednesday, December 11, 2013 5:57 PM
Subject: Re: Pulsar-List: 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:
> 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
> *
>
> *
Message 4
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| Subject: | Re: Thermostat Rotax 582 |
My 912 does not have a thermostat.
Clarke
On Wed, 11 Dec 2013 07:46:55 -0800 (PST)
Ron Koval <ronko@att.net> wrote:
> 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
Message 5
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| Subject: | Re: Thermostat Rotax 582 |
Bill,=0A-=0AI 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 simp
le 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-p
hysical size but 150 or 160 degree.=0A-=0AThanks for your the feedback.
=0A-=0A-Ron=0A=0A=0A________________________________=0AFrom: Bill Kulpa
<kulpa@att.net>=0ATo: pulsar-list@matronics.com =0ASent: Wednesday, Decemb
er 11, 2013 9:56 AM=0ASubject: Re: Pulsar-List: Thermostat Rotax 582=0A=0A
=0A=0AThe Thermostat has built in hysteresis so that it doesn't chatter (la
ck of a better word).- This means that it opens at 140-150=B0 and closes
at some lower temperature, probably around 100=B0.- The higher the open t
emp the higher the close temp so you might look at replacing your existing
with a higher temp thermostat, something around 180=B0.=0A=0ABest Regards,
Bill=0A=0AOn 12/11/2013 9:46 AM, Ron Koval wrote:=0A> Pulsar friends,=0A> W
ell its winter and with temperatures below freezing and air density way up,
the air speed is up as well.=0A> 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 defin
itely stays closed at cold start up, then it opens somewhere between 140-15
0 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 deg
rees 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 whet
her it is summer of winter, I never take off until I know the thermostat is
open.=0A> I assume that the thermostat does not operate well as a regulato
r, but works more like an on/off switch.- In addition to acting like a sw
itch, I believe that it takes an extreme drop in coolant temperature before
it closes again. Comments?=0A> It would be nice to find some way to contro
l this better, but maybe there are reasons, this is the way these things wo
========
Message 6
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| Subject: | Re: Thermostat Rotax 582 |
Keith,=0A-=0AMy heat sender unit is in the middle of the blue head, cente
red right between the 2 cylinders, adjacent to the thermostat, which I beli
eve 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 th
e thermostat is open.- Therefore, I would think the coolant temperature r
eading is close to the hottest temperature of the system (not the temperatu
re of return at the pump.=0A-=0AShould the temperature sender unit be som
ewhere else?=0A-=0ARon=0A=0A=0A________________________________=0AFrom: K
eith Palmer <kdpalmer@mweb.co.za>=0ATo: pulsar-list@matronics.com =0ASent:
Wednesday, December 11, 2013 10:29 AM=0ASubject: RE: Pulsar-List: Thermosta
lmer@mweb.co.za>=0A=0ARon,=0A- - - - You should check which side-
the heat sender unit is, in relation to=0Athe thermostat, which could caus
e this big variation of temp ?=0A=0AK'd=0ARPE - Skunkworx=0A=0A=0A-----Orig
inal Message-----=0AFrom: owner-pulsar-list-server@matronics.com=0A[mailto:
owner-pulsar-list-server@matronics.com] On Behalf Of Bill Kulpa=0ASent: Wed
nesday, December 11, 2013 5:57 PM=0ATo: pulsar-list@matronics.com=0ASubject
: Re: Pulsar-List: Thermostat Rotax 582=0A=0A--> Pulsar-List message posted
by: Bill Kulpa <kulpa@att.net>=0A=0ARon,=0A=0AThe Thermostat has built in
hysteresis so that it doesn't chatter (lack =0Aof a better word).- This m
eans that it opens at 140-150=B0 and closes at =0Asome lower temperature, p
robably around 100=B0.- The higher the open temp =0Athe higher the close
temp so you might look at replacing your existing =0Awith a higher temp the
rmostat, something around 180=B0.=0A=0ABest Regards, Bill=0A=0AOn 12/11/201
3 9:46 AM, Ron Koval wrote:=0A> Pulsar friends,=0A> Well its winter and wit
h temperatures below freezing and air density =0A> way up, the air speed is
up as well.=0A> But, here I am again, duct tape over half of the 2 radiato
rs to get =0A> the coolant temperature up to normal.- What I don't unders
tand or need =0A> confirmation on my theory is, the thermostat definitely s
tays closed =0A> at cold start up, then it opens somewhere between 140-150
degrees, =0A> then it seems to just stay open and if I didn't block so much
of the =0A> radiators, the gauge would show coolant down near 100-110 degr
ees.- =0A> Why doesn't the thermostat pinch off the flow to keep it aroun
d =0A> 140-150 degrees which seems to be its norm, once it starts flow =0A>
through the radiators?- Note, I am well aware of the dangers of shock
=0A> cooling in a 582 and whether it is summer of winter, I never take off
=0A> until I know the thermostat is open.=0A> I assume that the thermostat
does not operate well as a regulator, but =0A> works more like an on/off sw
itch.- In addition to acting like a =0A> switch, I believe that it takes
an extreme drop in coolant temperature =0A> before it closes again. Comment
s?=0A> It would be nice to find some way to control this better, but maybe
=0A> there are reasons, this is the way these things work.=0A> Best regards
======
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