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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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 Posted: Mon Dec 22, 2008 10:40 am Post subject: [!! SPAM] RE: Kitfox-List Digest: 39 Msgs - 12/21/08 |
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At 09:50 AM 12/22/2008, you wrote:
| Quote: | My 582-90 does not have a thermostat. Can one simply be added to the intake
or is a new intake housing needed?
|
I'm guessing you still have the thermostat housing attached to the
head, or else someone went to a lot of unnecessary work fabricating a
replacement. As such you should be able to simply install one.
| Quote: | I am not clear on the implications of a
thermostat to prevent cold seizure. Seems that with no thermostat, a
prolonged idling descent would allow constant circulation rather than a
buildup of cool water in the radiator, thus no cold seizure risk. Am I
thinking logically?
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You've got it right. I've heard a lot of people don't use them. I
don't know what the implications are, however, of trying to run the
engine at full power with the whole thing really cold. (I.e. less
than the 140F the thermostat opens at.) Presumably Rotax included a
thermostat for a reason.
| Quote: | And, will an occasional engine runup while descending
prevent seizure?
|
Yes and no. What you have to do to prevent cold seizure is either: 1)
keep the radiator water circulating, therefore keep the water temp
above 140, at least occasionally, or 2) return to power very
gradually, the same way you would warm the engine on the ground. I
either do very gradual high power descents keeping everything warm or
steep low power descents followed by a gradual increase in RPM
watching the water temp and keeping the RPM below, say 4000. The
latter is very difficult to do when it's really cold. I have had to
slow to near stall to get the engine to warm gradually. Hopefully
Noel or Dave or one of the other northern fliers will reply. They
must do this all the time.
Guy Buchanan
San Diego, CA
K-IV/1200 w/ 582 C-box & Warp 3 blade
100% and flying thanks mostly to Bob Ducar
| | - The Matronics Kitfox-List Email Forum - | | | 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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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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akflyer
Joined: 07 May 2007
Posts: 574
Location: Soldotna AK
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| Posted: Mon Dec 22, 2008 1:43 pm Post subject: Re: [!! SPAM] RE: Kitfox-List Digest: 39 Msgs - 12/21/08 |
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| Guy Buchanan wrote: | At 09:50 AM 12/22/2008, you wrote:
| Quote: | My 582-90 does not have a thermostat. Can one simply be added to the intake
or is a new intake housing needed?
|
I'm guessing you still have the thermostat housing attached to the
head, or else someone went to a lot of unnecessary work fabricating a
replacement. As such you should be able to simply install one.
| Quote: | I am not clear on the implications of a
thermostat to prevent cold seizure. Seems that with no thermostat, a
prolonged idling descent would allow constant circulation rather than a
buildup of cool water in the radiator, thus no cold seizure risk. Am I
thinking logically?
|
You've got it right. I've heard a lot of people don't use them. I
don't know what the implications are, however, of trying to run the
engine at full power with the whole thing really cold. (I.e. less
than the 140F the thermostat opens at.) Presumably Rotax included a
thermostat for a reason.
| Quote: | And, will an occasional engine runup while descending
prevent seizure?
|
Yes and no. What you have to do to prevent cold seizure is either: 1)
keep the radiator water circulating, therefore keep the water temp
above 140, at least occasionally, or 2) return to power very
gradually, the same way you would warm the engine on the ground. I
either do very gradual high power descents keeping everything warm or
steep low power descents followed by a gradual increase in RPM
watching the water temp and keeping the RPM below, say 4000. The
latter is very difficult to do when it's really cold. I have had to
slow to near stall to get the engine to warm gradually. Hopefully
Noel or Dave or one of the other northern fliers will reply. They
must do this all the time.
Guy Buchanan
San Diego, CA
K-IV/1200 w/ 582 C-box & Warp 3 blade
100% and flying thanks mostly to Bob Ducar |
I found the best technique is to stay below 100' AGL at all time... makes decent real easy lol. In all honesty, running a thermostat, I have never had an issue with the engine cooling too much on a low power decent from the one time I did go to 8,000. Most of the time I never go above 1,000 unless I am practicing stalls or minimum speed maneuvers. on the decent from 8,000 I just pulled it back to about 3000 - 3500 and pointed the nose downhill with flaps on. A slip here and there to keep speeds under control and you can fall outa the sky pretty darn quick and still keep the water circulating.
| | - The Matronics Kitfox-List Email Forum - | | | 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:
http://www.matronics.com/Navigator?Kitfox-List |
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_________________
DO NOT ARCHIVE
Leonard Perry aka SNAKE
Soldotna AK
Avid "C" / Mk IV
582 (147 hrs and counting on the rebuild)
IVO IFA
Full Lotus 1450
#1 snake oil salesman since 1-22-2009
I would rather die trying to live, than to live trying not to die.... |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Mon Dec 22, 2008 1:52 pm Post subject: [!! SPAM] RE: Kitfox-List Digest: 39 Msgs - 12/21/08 |
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Real northern fliers cool with air.
Sorry, Guy, you left the door w-i-d-e o-p-e-n : )
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 596+ hrs
Sensenich 62x46
flying again after rebuild, and new Electroair direct-fire ignition
system;
also building a new pair of snow skis
do not archive
On Dec 22, 2008, at 1:39 PM, Guy Buchanan wrote:
| Quote: | Hopefully Noel or Dave or one of the other northern fliers will
reply. They must do this all the time.
Guy Buchanan
|
| | - The Matronics Kitfox-List Email Forum - | | | 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:
http://www.matronics.com/Navigator?Kitfox-List |
|
_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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