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mhilderbrand
Joined: 28 Sep 2006
Posts: 36
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 Posted: Thu Feb 11, 2010 3:58 pm Post subject: Cold CHTs |
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Flying in the colder weather (20-30deg F) I have the following CHTs:
148 155 199 169 194 202 (1,3,5,2,4,6) This is at 2790 RPM
I am in the process of closing off the in lets to the heads in order to bring the temps up. Are there any MAJOR problems I might have created with such low CHT's?
My mag checks are showing a significant drop....(right at, and sometimes > 100) I have been blaming it on possible carbon build up. I experienced this on the Cessna I used to fly and would lean until the rpm normalizes. Today I am going to check the ignition/plug wires to make sure all is well.
Michael Hilderbrand
Derby, Kansas
Http://www.kansasflying.com
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plus2s
Joined: 30 Nov 2006
Posts: 65
Location: NEW ZEALAND
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| Posted: Thu Feb 11, 2010 4:56 pm Post subject: Cold CHTs |
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Re the mag drop - Check your coil to flywheel gaps -
Low temps are far better than high temps
Regards
Keith
--- On Fri, 12/2/10, Michael Hilderbrand <m_hilderbrand(at)sbcglobal.net> wrote:
| Quote: |
From: Michael Hilderbrand <m_hilderbrand(at)sbcglobal.net>
Subject: Cold CHTs
To: jabiruengine-list(at)matronics.com
Date: Friday, 12 February, 2010, 12:52 PM
Flying in the colder weather (20-30deg F) I have the following CHTs:
148 155 199 169 194 202 (1,3,5,2,4,6) This is at 2790 RPM
I am in the process of closing off the in lets to the heads in order to bring the temps up. Are there any MAJOR problems I might have created with such low CHT's?
My mag checks are showing a significant drop....(right at, and sometimes > 100) I have been blaming it on possible carbon build up. I experienced this on the Cessna I used to fly and would lean until the rpm normalizes. Today I am going to check the ignition/plug wires to make sure all is well.
Michael Hilderbrand
Derby, Kansas
Http://www.kansasflying..com
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Fri Feb 12, 2010 8:57 pm Post subject: Re: Cold CHTs |
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In cold weather bigger mag drops are common. Adjust the carb. Even Rotax made a video about this. Cold weather verses very warm weather means leaner fuel air mix.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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