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ceengland7(at)gmail.com
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 Posted: Thu Jun 07, 2018 6:22 pm Post subject: Placement options for CHT probe |
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On 6/7/2018 8:35 PM, John Fitt wrote:
| Quote: | Greetings from Sebastopol, CA
Has anybody used a cylinder head bolt ( immediately next to a spark plug) instead of the probe ring
under the plug? I am currently using the cylinder head bolts, wanting to eliminate the wear and tear
on the probe ring when checking/changing plugs. Seems that the temp. readings are lower- maybe due to the heat lost near a fin?
FSII 503 dcdi
EIS monitor
CHT runs around 100-120 deg
John Fitt
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From the Lycoming world: Washer-based cht probes on the plugs always indicate significantly higher than probes screwed into the heads. The plug is the hottest spot in the cylinder.
 Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
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rascaljohn
Joined: 02 May 2013
Posts: 23
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| Posted: Thu Jun 07, 2018 8:23 pm Post subject: Placement options for CHT probe |
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Thanks for the reply. Any way to save on the wear and tear?
Sent from my iPhone
On Jun 7, 2018, at 7:22 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | On 6/7/2018 8:35 PM, John Fitt wrote:
| Quote: | Greetings from Sebastopol, CA
Has anybody used a cylinder head bolt ( immediately next to a spark plug) instead of the probe ring
under the plug? I am currently using the cylinder head bolts, wanting to eliminate the wear and tear
on the probe ring when checking/changing plugs. Seems that the temp. readings are lower- maybe due to the heat lost near a fin?
FSII 503 dcdi
EIS monitor
CHT runs around 100-120 deg
John Fitt
|
From the Lycoming world: Washer-based cht probes on the plugs always indicate significantly higher than probes screwed into the heads. The plug is the hottest spot in the cylinder.
Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
|
| | - The Matronics Kolb-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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gdhelton(at)gmail.com
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| Posted: Fri Jun 08, 2018 7:32 am Post subject: Placement options for CHT probe |
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Your CHT seems very low. Do you have your EIS set for centigrade or Fahrenheit?The most common cause for the disfigurement of spark-plug base rings is over- torque of spark plugs. I was surprised to find out that my engine ( 40hp Hirth 2702 ) only requires 108 inch pounds ( yes, inch pounds) of torque and with the spark-plugs seal ring installed with no anti- sieze compound.
George H.
Mesick, Michigan
Sent from my iPhone
On Jun 8, 2018, at 12:23 AM, John Fitt <jpfitt(at)sbcglobal.net (jpfitt(at)sbcglobal.net)> wrote:
| Quote: | Thanks for the reply. Any way to save on the wear and tear?
Sent from my iPhone
On Jun 7, 2018, at 7:22 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | On 6/7/2018 8:35 PM, John Fitt wrote:
| Quote: | Greetings from Sebastopol, CA
Has anybody used a cylinder head bolt ( immediately next to a spark plug) instead of the probe ring
under the plug? I am currently using the cylinder head bolts, wanting to eliminate the wear and tear
on the probe ring when checking/changing plugs. Seems that the temp. readings are lower- maybe due to the heat lost near a fin?
FSII 503 dcdi
EIS monitor
CHT runs around 100-120 deg
John Fitt
|
From the Lycoming world: Washer-based cht probes on the plugs always indicate significantly higher than probes screwed into the heads. The plug is the hottest spot in the cylinder.
Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
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racerjerry
Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY
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| Posted: Sat Jun 09, 2018 3:18 am Post subject: Re: Placement options for CHT probe |
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Why don't you do a side-by-side test / comparison with the CHT probes in both locations on the same cylinder? A double throw switch temporarily wired in would give you an immediate comparison.
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