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Tucsonchris
Joined: 26 Oct 2007
Posts: 12
Location: Tucson, Arizona
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 Posted: Sun May 01, 2011 12:38 pm Post subject: Spark plug analysis at 50hrs |
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Just looking for some opinions on my plugs after 50 hours on a new 912uls. I'm running 100% 100LL with Decalin. Cylinder 2 runs 20 degrees cooler than Cyl 3 on the CHT's. Cyl 3 will run 235 at 72 degrees. And 243 at 80 degrees. The picture doesn't quite capture whiteish deposits throughout.
Tucson Chris
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Chris G.
Tucson, Arizona
Marana Regional Airport
Kitfox SS
912s |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun May 01, 2011 2:46 pm Post subject: Re: Spark plug analysis at 50hrs |
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Hi Chris,
They look normal to me. Put them back in.
gap to .027
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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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daveaustin2(at)primus.ca
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| Posted: Sun May 01, 2011 5:21 pm Post subject: Spark plug analysis at 50hrs |
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Interesting comment on the spark plugs. The ULS may be different, but I have found from some
"unable to start" situations, hot and cold, that I need to keep the gaps at 22 thou max.
Would appreciate comments.
Dave Austin 912 UL HDS
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Mon May 02, 2011 4:04 am Post subject: Re: Spark plug analysis at 50hrs |
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...keep the gaps at 22 thou max....
I always set spark plug gap at the minimum of the acceptable range (all engines) because when plugs wear, the gap always grows, never shrinks.
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Mon May 02, 2011 7:37 pm Post subject: Re: Spark plug analysis at 50hrs |
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The recommended plug gap is .023 to .027
Usually the narrow gap is better for cold weather. The narrow plug gaps do aid in starting when cold, but usually the wider gap is better for summer running. It won't hurt to have a narrow gap in the hotter months, but it does tend to run better with a wider gap for hotter weather. If you are changing your plugs between 75-100 hours the gap shouldn't change but slightly. If you leave them in longer then they should be cleaned and re-gapped. I never leave a plug in longer than 100 hours.
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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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mortweaver(at)sbcglobal.n
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| Posted: Tue May 03, 2011 12:26 pm Post subject: Spark plug analysis at 50hrs |
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New spark plugs every 100 hours suggests that you are trashing a lot of good spark plugs.
Without any sign of gas leakage around the porcelain insulator or electrode erosion I would not arbitrarily trash low time spark plugs that are functioning. Unless one is running a very lean mixture, the Rotax 912 has a low energy spark so electrode erosion over time should be minimal. I have found that Iridium electrode plugs in a mechanically sound auto engine may only require re-gaping every 100,000 thousand miles depending energy level of the spark. Just an opinion from individual with over 50 years of experience working on vehicles belonging to me and others.
Dave Weaver
--- On Mon, 5/2/11, Roger Lee <ssadiver1(at)yahoo.com> wrote:
| Quote: |
From: Roger Lee <ssadiver1(at)yahoo.com>
Subject: RotaxEngines-List: Re: Spark plug analysis at 50hrs
To: rotaxengines-list(at)matronics.com
Date: Monday, May 2, 2011, 10:37 PM
--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)>
The recommended plug gap is .023 to .027
Usually the narrow gap is better for cold weather. The narrow plug gaps do aid in starting when cold, but usually the wider gap is better for summer running. It won't hurt to have a narrow gap in the hotter months, but it does tend to run better with a wider gap for hotter weather. If you are changing your plugs between 75-100 hours the gap shouldn't change but slightly. If you leave them in longer then they should be cleaned and re-gapped. I never leave a plug in longer than 100 hours.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtophref="http://www.matronics.com/Navigator?RotaxEngines-List" target=_blat also available via the Web nbsp; -Matt matronics.com/contribution" target=_blank>http://www.matronics.com/contri================
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[quote][b]
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m.tucciarone(at)hotmail.c
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| Posted: Tue May 03, 2011 1:55 pm Post subject: Spark plug analysis at 50hrs |
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I have 150 hours on mine. I checked the gap at annual and they were still fine. 912uls
From: David Weaver (mortweaver(at)sbcglobal.net)
Sent: Tuesday, May 03, 2011 4:21 PM
To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)
Subject: Re: Re: Spark plug analysis at 50hrs
New spark plugs every 100 hours suggests that you are trashing a lot of good spark plugs.
Without any sign of gas leakage around the porcelain insulator or electrode erosion I would not arbitrarily trash low time spark plugs that are functioning. Unless one is running a very lean mixture, the Rotax 912 has a low energy spark so electrode erosion over time should be minimal. I have found that Iridium electrode plugs in a mechanically sound auto engine may only require re-gaping every 100,000 thousand miles depending energy level of the spark. Just an opinion from individual with over 50 years of experience working on vehicles belonging to me and others.
Dave Weaver
--- On Mon, 5/2/11, Roger Lee <ssadiver1(at)yahoo.com> wrote:
| Quote: |
From: Roger Lee <ssadiver1(at)yahoo.com>
Subject: RotaxEngines-List: Re: Spark plug analysis at 50hrs
To: rotaxengines-list(at)matronics.com
Date: Monday, May 2, 2011, 10:37 PM
--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)>
The recommended plug gap is .023 to .027
Usually the narrow gap is better for cold weather. The narrow plug gaps do aid in starting when cold, but usually the wider gap is better for summer running. It won't hurt to have a narrow gap in the hotter months, but it does tend to run better with a wider gap for hotter weather. If you are changing your plugs between 75-100 hours the gap shouldn't change but slightly. If you leave them in longer then they should be cleaned and re-gapped. I never leave a plug in longer than 100 hours.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtophref="http://www.matronics.com/Navigator?RotaxEngines-List" target=_blat also available via the Web nbsp; -Matt matronics.com/contribution" target=_blank>http://www.matronics.com/contri================
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[quote]
href="http://www.matronics.com/Navigator?RotaxEngines-List">http://www.matronics.com/Navigator?RotaxEngines-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
[b]
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pchristensen10(at)austin.
Guest
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| Posted: Tue May 03, 2011 3:55 pm Post subject: Spark plug analysis at 50hrs |
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But isn't the gasket only good for about 4 times for removal and replacement?
Pete
On 5/3/2011 3:21 PM, David Weaver wrote: [quote] New spark plugs every 100 hours suggests that you are trashing a lot of good spark plugs.
Without any sign of gas leakage around the porcelain insulator or electrode erosion I would not arbitrarily trash low time spark plugs that are functioning. Unless one is running a very lean mixture, the Rotax 912 has a low energy spark so electrode erosion over time should be minimal. I have found that Iridium electrode plugs in a mechanically sound auto engine may only require re-gaping every 100,000 thousand miles depending energy level of the spark. Just an opinion from individual with over 50 years of experience working on vehicles belonging to me and others.
Dave Weaver
--- On Mon, 5/2/11, Roger Lee <ssadiver1(at)yahoo.com> (ssadiver1(at)yahoo.com) wrote:
| Quote: |
From: Roger Lee <ssadiver1(at)yahoo.com> (ssadiver1(at)yahoo.com)
Subject: RotaxEngines-List: Re: Spark plug analysis at 50hrs
To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)
Date: Monday, May 2, 2011, 10:37 PM
--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)yahoo.com)>
The recommended plug gap is .023 to .027
Usually the narrow gap is better for cold weather. The narrow plug gaps do aid in starting when cold, but usually the wider gap is better for summer running. It won't hurt to have a narrow gap in the hotter months, but it does tend to run better with a wider gap for hotter weather. If you are changing your plugs between 75-100 hours the gap shouldn't change but slightly. If you leave them in longer then they should be cleaned and re-gapped. I never leave a plug in longer than 100 hours.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtophref="http://www.matronics.com/Navigator?RotaxEngines-List" target=_blat also available via the Web nbsp; -Matt matronics.com/contribution" target=_blank>http://www.matronics.com/contri================
|
[b]
| | - The Matronics RotaxEngines-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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dirtfly7(at)yahoo.com
Guest
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| Posted: Tue May 03, 2011 7:04 pm Post subject: Spark plug analysis at 50hrs |
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I change my plugs about every 600 hours. Even then they still look good.
Joel
--- On Tue, 5/3/11, Pete Christensen <pchristensen10(at)austin.rr.com> wrote:
| Quote: |
From: Pete Christensen <pchristensen10(at)austin.rr.com>
Subject: Re: Re: Spark plug analysis at 50hrs
To: rotaxengines-list(at)matronics.com
Date: Tuesday, May 3, 2011, 5:51 PM
But isn't the gasket only good for about 4 times for removal and replacement?
Pete
On 5/3/2011 3:21 PM, David Weaver wrote: | Quote: | New spark plugs every 100 hours suggests that you are trashing a lot of good spark plugs.
Without any sign of gas leakage around the porcelain insulator or electrode erosion I would not arbitrarily trash low time spark plugs that are functioning. Unless one is running a very lean mixture, the Rotax 912 has a low energy spark so electrode erosion over time should be minimal. I have found that Iridium electrode plugs in a mechanically sound auto engine may only require re-gaping every 100,000 thousand miles depending energy level of the spark. Just an opinion from individual with over 50 years of experience working on vehicles belonging to me and others.
Dave Weaver
--- On Mon, 5/2/11, Roger Lee [url=/mc/compose?to=ssadiver1(at)yahoo.com]<ssadiver1(at)yahoo.com>[/url] wrote:
| Quote: |
From: Roger Lee [url=/mc/compose?to=ssadiver1(at)yahoo.com]<ssadiver1(at)yahoo.com>[/url]
Subject: RotaxEngines-List: Re: Spark plug analysis at 50hrs
To: [url=/mc/compose?to=rotaxengines-list(at)matronics.com]rotaxengines-list(at)matronics.com[/url]
Date: Monday, May 2, 2011, 10:37 PM
--> RotaxEngines-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com>
The recommended plug gap is .023 to .027
Usually the narrow gap is better for cold weather. The narrow plug gaps do aid in starting when cold, but usually the wider gap is better for summer running. It won't hurt to have a narrow gap in the hotter months, but it does tend to run better with a wider gap for hotter weather. If you are changing your plugs between 75-100 hours the gap shouldn't change but slightly. If you leave them in longer then they should be cleaned and re-gapped. I never leave a plug in longer than 100 hours.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtophref="http://www.matronics.com/Navigator?RotaxEngines-List" target=_blat also available via the Web nbsp; -Matt matronics.com/contribution" target=_blank>http://www.matronics.com/contri================
|
http://www.matronics.com/=================
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[quote][b]
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