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rrh(at)rrhoyt.com
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 Posted: Sun Oct 30, 2011 6:27 pm Post subject: #3 cylinder miss. |
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I am looking for ideas as to what might cause the following:
On the first flight after about 1/2 hr the #3 cylinder exhaust temp went
to approximately 250 degrees. All other cylinders showed the normal temp
of about 1200 degrees. This occurred when the RPM was reduced to the low
4000 range and continued down into the 3000 range. During the final to
the runway the engine was idled and the cold exhaust returned to normal.
After landing the engine was given a MAG test and both MAGs worked
normally At 3500 rpm.
The plugs were pulled and all looked normal, Grayish white porcelain,
dry and no soot.
I believe the ignition is a wasted spark which means that I should have
more than 1 cylinder show the failure if it was the ignition system.
Could it be a sticky valve?
Any other ideas?
Thanks for any feedback
Ron Hoyt
N232S
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Ivor Phillips
Joined: 16 Jan 2006
Posts: 253
Location: London UK
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| Posted: Mon Oct 31, 2011 12:23 am Post subject: #3 cylinder miss. |
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The Obvious question Ron was it really missing? did you get a vibration and drop in performance? If not, Then check out the EGT probes and wiring and earthing points,
If possible swap the EGT over with another cylinder to see if it swap's sides,
regards
Ivor
On 31 October 2011 02:20, Ron Hoyt <rrh(at)rrhoyt.com (rrh(at)rrhoyt.com)> wrote:
[quote] --> RotaxEngines-List message posted by: Ron Hoyt <rrh(at)rrhoyt.com (rrh(at)rrhoyt.com)>
I am looking for ideas as to what might cause the following:
On the first flight after about 1/2 hr the #3 cylinder exhaust temp went to approximately 250 degrees. All other cylinders showed the normal temp of about 1200 degrees. This occurred when the RPM was reduced to the low 4000 range and continued down into the 3000 range. During the final to the runway the engine was idled and the cold exhaust returned to normal.
After landing the engine was given a MAG test and both MAGs worked normally At 3500 rpm.
The plugs were pulled and all looked normal, Grayish white porcelain, dry and no soot.
I believe the ignition is a wasted spark which means that I should have more than 1 cylinder show the failure if it was the ignition system.
Could it be a sticky valve?
Any other ideas?
Thanks for any feedback
Ron Hoyt
N232S
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="_blank">http://www.matronics.com/contribution
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Mon Oct 31, 2011 4:08 am Post subject: #3 cylinder miss. |
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Assuming you are talking about a 912 engine, 1200F is not normal for normal cruise rpms. That is low. 912 EGTs are normally in the 1400-1450 range at 5000rpm or higher, unless you are flying at very high density altitudes, in which case they could be down in the low to mid 1300 range.
Thom in Buffalo
On Mon, Oct 31, 2011 at 4:20 AM, PHILLIPS I <ivor.phillips(at)ntlworld.com (ivor.phillips(at)ntlworld.com)> wrote:
[quote]The Obvious question Ron was it really missing? did you get a vibration and drop in performance? If not, Then check out the EGT probes and wiring and earthing points,
If possible swap the EGT over with another cylinder to see if it swap's sides,
regards
Ivor
On 31 October 2011 02:20, Ron Hoyt <rrh(at)rrhoyt.com (rrh(at)rrhoyt.com)> wrote:
| Quote: | --> RotaxEngines-List message posted by: Ron Hoyt <rrh(at)rrhoyt.com (rrh(at)rrhoyt.com)>
I am looking for ideas as to what might cause the following:
On the first flight after about 1/2 hr the #3 cylinder exhaust temp went to approximately 250 degrees. All other cylinders showed the normal temp of about 1200 degrees. This occurred when the RPM was reduced to the low 4000 range and continued down into the 3000 range. During the final to the runway the engine was idled and the cold exhaust returned to normal.
After landing the engine was given a MAG test and both MAGs worked normally At 3500 rpm.
The plugs were pulled and all looked normal, Grayish white porcelain, dry and no soot.
I believe the ignition is a wasted spark which means that I should have more than 1 cylinder show the failure if it was the ignition system.
Could it be a sticky valve?
Any other ideas?
Thanks for any feedback
Ron Hoyt
N232S
====================================
-List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
====================================
http://forums.matronics.com
====================================
le, List Admin.
="_blank">http://www.matronics.com/contribution
====================================
|
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
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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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rrh(at)rrhoyt.com
Guest
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| Posted: Mon Oct 31, 2011 8:50 am Post subject: #3 cylinder miss. |
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Yes the engine vibration increased. The drop in performance was masked
by the throttle reduction
I'll check the probes anyway. Thanks
Ron
On 10/31/2011 2:20 AM, PHILLIPS I wrote:
| Quote: | The Obvious question Ron was it really missing? did you get a vibration
and drop in performance? If not, Then check out the EGT probes and
wiring and earthing points,
If possible swap the EGT over with another cylinder to see if it swap's
sides,
regards
Ivor
On 31 October 2011 02:20, Ron Hoyt<rrh(at)rrhoyt.com> wrote:
>
>
> I am looking for ideas as to what might cause the following:
>
> On the first flight after about 1/2 hr the #3 cylinder exhaust temp went
> to approximately 250 degrees. All other cylinders showed the normal temp of
> about 1200 degrees. This occurred when the RPM was reduced to the low 4000
> range and continued down into the 3000 range. During the final to the
> runway the engine was idled and the cold exhaust returned to normal.
>
> After landing the engine was given a MAG test and both MAGs worked
> normally At 3500 rpm.
>
> The plugs were pulled and all looked normal, Grayish white porcelain, dry
> and no soot.
>
> I believe the ignition is a wasted spark which means that I should have
> more than 1 cylinder show the failure if it was the ignition system.
>
> Could it be a sticky valve?
>
> Any other ideas?
>
> Thanks for any feedback
> Ron Hoyt
> N232S
>
|
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rrh(at)rrhoyt.com
Guest
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| Posted: Mon Oct 31, 2011 8:58 am Post subject: #3 cylinder miss. |
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You are correct, the egt was in the high 1400, just below 1500 and the
OAT was 33 deg. at 3800 ft where the engine was operating fine. The
plugs indicate the engine was slightly on the lean side of combustion.
Thanks
Ron
On 10/31/2011 6:05 AM, Thom Riddle wrote:
| Quote: | Assuming you are talking about a 912 engine, 1200F is not normal for normal
cruise rpms. That is low. 912 EGTs are normally in the 1400-1450 range at
5000rpm or higher, unless you are flying at very high density altitudes, in
which case they could be down in the low to mid 1300 range.
Thom in Buffalo
On Mon, Oct 31, 2011 at 4:20 AM, PHILLIPS I<ivor.phillips(at)ntlworld.com>wrote:
> The Obvious question Ron was it really missing? did you get a vibration
> and drop in performance? If not, Then check out the EGT probes and
> wiring and earthing points,
> If possible swap the EGT over with another cylinder to see if it swap's
> sides,
>
> regards
> Ivor
>
> On 31 October 2011 02:20, Ron Hoyt<rrh(at)rrhoyt.com> wrote:
>
>>
>>
>> I am looking for ideas as to what might cause the following:
>>
>> On the first flight after about 1/2 hr the #3 cylinder exhaust temp went
>> to approximately 250 degrees. All other cylinders showed the normal temp of
>> about 1200 degrees. This occurred when the RPM was reduced to the low 4000
>> range and continued down into the 3000 range. During the final to the
>> runway the engine was idled and the cold exhaust returned to normal.
>>
>> After landing the engine was given a MAG test and both MAGs worked
>> normally At 3500 rpm.
>>
>> The plugs were pulled and all looked normal, Grayish white porcelain, dry
>> and no soot.
>>
>> I believe the ignition is a wasted spark which means that I should have
>> more than 1 cylinder show the failure if it was the ignition system.
>>
>> Could it be a sticky valve?
>>
>> Any other ideas?
>>
>> Thanks for any feedback
>> Ron Hoyt
>> N232S
>>
>> ====**==============================**==
>> -List" target="_blank">http://www.matronics.com/**
>> Navigator?RotaxEngines-List
>> ====**==============================**==
>> http://forums.matronics.com
>> ====**==============================**==
>> le, List Admin.
>> ="_blank">http://www.matronics.com/**contribution
>> ====**==============================**==
>>
>>
>>
>>
> *
>
> *
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