Today's Message Index:
----------------------
1. 06:37 AM - New engine runs a little rough when weather is cold. (n7188u)
2. 06:47 AM - Re: New engine runs a little rough when weather is cold. (Pete Zut)
3. 07:26 AM - Re: New engine runs a little rough when weather is cold. (MIKE CHRISTINE DUANE)
4. 07:28 AM - Re: New engine runs a little rough when weather is cold. (D McFadyean)
5. 07:28 AM - Re: New engine runs a little rough when weather is cold. (Pete Zut)
6. 07:31 AM - Re: New engine runs a little rough when weather is cold. (n7188u)
7. 01:25 PM - Re: New engine runs a little rough when weather is cold. (Kingsley Hurst)
8. 02:05 PM - Re: New engine runs a little rough when weather is cold. (n7188u)
9. 03:34 PM - Re: New engine runs a little rough when weather is cold. (Area-51)
Message 1
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| Subject: | New engine runs a little rough when weather is cold. |
Hi Guys (and Gals),
Haven't posted much lately but things going well with my mono. Enjoying it more
every day.
One question, and a puzzler for me, regarding engine vibration (yes, I know I am
picky about this subject but I hate when things are running well and then change):
My new engine (about 70 hrs now) has always ran pretty good. However, as of late,
I noticed a slight (emphasis on slight) vibration when I power down to a low
cruise power setting (around 500-5100 RPM). Now, I know that some people will
start screaming that I should not keep the power that low but I had no issues
with sensing vibration (slight) at that power level before.
Well, I started to suspect that this was happening when the weather got colder
(50s-60s F). EGT looks good at around 1400. And even though I have blocked maybe
1/2 of the oil cooler, it still runs a little bellow 180 (160-170). Coolant
has been as low as mod 150s.
Sure enough, last flight the vibration was noticeable. Yesterday we had a warm
and humid day, in the 80s, so I decided to test my theory. Lo and Behold the engine
ran great. Absolutely no vibration at 5000 RPM.
My suspicion at this point is that the cold air from our ram air induction system
is just very cold, and maybe adds a little extra pressure, and the mixture
goes lean with the stock 912S carb setting. # 1 and 2 plugs look normal (slight
tan) but the #3 and 4 look lean (white). Engine is stock as it came from Rotax
with no changes to the carbs made.
If we get a cold day again I will try moving the needles up one notch but I wonder
if anyone had an experience like this before.
Best Regards,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510082#510082
Message 2
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| Subject: | Re: New engine runs a little rough when weather is cold. |
Interesting.... curious, what prop are you running? :-)
Cheers,
PeteZ
On Tue, Jan 31, 2023 at 9:44 AM n7188u <chmgarb@gmail.com> wrote:
>
> Hi Guys (and Gals),
>
> Haven't posted much lately but things going well with my mono. Enjoying i
t
> more every day.
>
> One question, and a puzzler for me, regarding engine vibration (yes, I
> know I am picky about this subject but I hate when things are running wel
l
> and then change):
>
> My new engine (about 70 hrs now) has always ran pretty good. However, as
> of late, I noticed a slight (emphasis on slight) vibration when I power
> down to a low cruise power setting (around 500-5100 RPM). Now, I know tha
t
> some people will start screaming that I should not keep the power that lo
w
> but I had no issues with sensing vibration (slight) at that power level
> before.
>
> Well, I started to suspect that this was happening when the weather got
> colder (50s-60s =C2=B0F). EGT looks good at around 1400. And even though
I have
> blocked maybe 1/2 of the oil cooler, it still runs a little bellow 180
> (160-170). Coolant has been as low as mod 150s.
>
> Sure enough, last flight the vibration was noticeable. Yesterday we had a
> warm and humid day, in the 80s, so I decided to test my theory. Lo and
> Behold the engine ran great. Absolutely no vibration at 5000 RPM.
>
> My suspicion at this point is that the cold air from our ram air inductio
n
> system is just very cold, and maybe adds a little extra pressure, and the
> mixture goes lean with the stock 912S carb setting. # 1 and 2 plugs look
> normal (slight tan) but the #3 and 4 look lean (white). Engine is stock a
s
> it came from Rotax with no changes to the carbs made.
>
> If we get a cold day again I will try moving the needles up one notch but
> I wonder if anyone had an experience like this before.
>
> Best Regards,
> Chris
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510082#510082
>
>
===========
===========
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>
>
Message 3
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| Subject: | Re: New engine runs a little rough when weather is cold. |
If you pull on Carb Heat, does the vibration smooth back out?
Mike Duane
N377EA Europa Conventional Gear
Jabiru 3300A
Sensenich 2Blade Ground Adj. Prop
Sent from my iPhone
> On Jan 31, 2023, at 7:47 AM, Pete Zut <peterz@zutrasoft.com> wrote:
>
> =EF=BB
> Interesting.... curious, what prop are you running? :-)
>
> Cheers,
> PeteZ
>
>> On Tue, Jan 31, 2023 at 9:44 AM n7188u <chmgarb@gmail.com> wrote:
>>
>> Hi Guys (and Gals),
>>
>> Haven't posted much lately but things going well with my mono. Enjoying i
t more every day.
>>
>> One question, and a puzzler for me, regarding engine vibration (yes, I kn
ow I am picky about this subject but I hate when things are running well and
then change):
>>
>> My new engine (about 70 hrs now) has always ran pretty good. However, as o
f late, I noticed a slight (emphasis on slight) vibration when I power down t
o a low cruise power setting (around 500-5100 RPM). Now, I know that some pe
ople will start screaming that I should not keep the power that low but I ha
d no issues with sensing vibration (slight) at that power level before.
>>
>> Well, I started to suspect that this was happening when the weather got c
older (50s-60s =C2=B0F). EGT looks good at around 1400. And even though I ha
ve blocked maybe 1/2 of the oil cooler, it still runs a little bellow 180 (1
60-170). Coolant has been as low as mod 150s.
>>
>> Sure enough, last flight the vibration was noticeable. Yesterday we had a
warm and humid day, in the 80s, so I decided to test my theory. Lo and Beho
ld the engine ran great. Absolutely no vibration at 5000 RPM.
>>
>> My suspicion at this point is that the cold air from our ram air inductio
n system is just very cold, and maybe adds a little extra pressure, and the m
ixture goes lean with the stock 912S carb setting. # 1 and 2 plugs look norm
al (slight tan) but the #3 and 4 look lean (white). Engine is stock as it ca
me from Rotax with no changes to the carbs made.
>>
>> If we get a cold day again I will try moving the needles up one notch but
I wonder if anyone had an experience like this before.
>>
>> Best Regards,
>> Chris
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=510082#510082
>>
>>
>>
>>
>>
>>
>> ==========
>> pa-List" rel="noreferrer" target="_blank">http://www.matronics.com/Na
vigator?Europa-List
>> ==========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ==========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> ="noreferrer" target="_blank">https://matronics.com/contribution
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>>
>>
>>
Message 4
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| Subject: | Re: New engine runs a little rough when weather is cold. |
There should be a detectable change (small increase) to EGTs if dense air is causing
the engine to run lean. Or small decreases if carb ice is the culprit.
I've had a recent engine change and find the "new" motor to ice-up during the start/warm
up processes, much more than the old engine this winter.
Differences in gearbox friction torque may also introduce new affects, especially
for the 'picky'!
Duncan McF.
> On 31 January 2023 at 14:36 n7188u <chmgarb@gmail.com> wrote:
>
>
>
> Hi Guys (and Gals),
>
> Haven't posted much lately but things going well with my mono. Enjoying it more
every day.
>
> One question, and a puzzler for me, regarding engine vibration (yes, I know I
am picky about this subject but I hate when things are running well and then
change):
>
> My new engine (about 70 hrs now) has always ran pretty good. However, as of late,
I noticed a slight (emphasis on slight) vibration when I power down to a
low cruise power setting (around 500-5100 RPM). Now, I know that some people will
start screaming that I should not keep the power that low but I had no issues
with sensing vibration (slight) at that power level before.
>
> Well, I started to suspect that this was happening when the weather got colder
(50s-60s F). EGT looks good at around 1400. And even though I have blocked maybe
1/2 of the oil cooler, it still runs a little bellow 180 (160-170). Coolant
has been as low as mod 150s.
>
> Sure enough, last flight the vibration was noticeable. Yesterday we had a warm
and humid day, in the 80s, so I decided to test my theory. Lo and Behold the
engine ran great. Absolutely no vibration at 5000 RPM.
>
> My suspicion at this point is that the cold air from our ram air induction system
is just very cold, and maybe adds a little extra pressure, and the mixture
goes lean with the stock 912S carb setting. # 1 and 2 plugs look normal (slight
tan) but the #3 and 4 look lean (white). Engine is stock as it came from Rotax
with no changes to the carbs made.
>
> If we get a cold day again I will try moving the needles up one notch but I wonder
if anyone had an experience like this before.
>
> Best Regards,
> Chris
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510082#510082
>
>
>
>
>
>
>
>
>
Message 5
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| Subject: | Re: New engine runs a little rough when weather is cold. |
hi Chris,
I'd be curious if your dog-tension friction measurement has decreased.
Ideally it should be around 30ft-lbs.
cheers,
Pete
On Tue, Jan 31, 2023 at 9:44 AM n7188u <chmgarb@gmail.com> wrote:
>
> Hi Guys (and Gals),
>
> Haven't posted much lately but things going well with my mono. Enjoying i
t
> more every day.
>
> One question, and a puzzler for me, regarding engine vibration (yes, I
> know I am picky about this subject but I hate when things are running wel
l
> and then change):
>
> My new engine (about 70 hrs now) has always ran pretty good. However, as
> of late, I noticed a slight (emphasis on slight) vibration when I power
> down to a low cruise power setting (around 500-5100 RPM). Now, I know tha
t
> some people will start screaming that I should not keep the power that lo
w
> but I had no issues with sensing vibration (slight) at that power level
> before.
>
> Well, I started to suspect that this was happening when the weather got
> colder (50s-60s =C2=B0F). EGT looks good at around 1400. And even though
I have
> blocked maybe 1/2 of the oil cooler, it still runs a little bellow 180
> (160-170). Coolant has been as low as mod 150s.
>
> Sure enough, last flight the vibration was noticeable. Yesterday we had a
> warm and humid day, in the 80s, so I decided to test my theory. Lo and
> Behold the engine ran great. Absolutely no vibration at 5000 RPM.
>
> My suspicion at this point is that the cold air from our ram air inductio
n
> system is just very cold, and maybe adds a little extra pressure, and the
> mixture goes lean with the stock 912S carb setting. # 1 and 2 plugs look
> normal (slight tan) but the #3 and 4 look lean (white). Engine is stock a
s
> it came from Rotax with no changes to the carbs made.
>
> If we get a cold day again I will try moving the needles up one notch but
> I wonder if anyone had an experience like this before.
>
> Best Regards,
> Chris
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510082#510082
>
>
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===========
===========
===========
===========
>
>
Message 6
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| Subject: | Re: New engine runs a little rough when weather is cold. |
Hi Pete,
I have a DUC SWIRL-3 prop. Quite happy with it.
Best,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510087#510087
Message 7
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| Subject: | Re: New engine runs a little rough when weather is cold. |
Hello Chris,
Just a couple of questions ..
1 Do you have the overflow/equaliser hoses on the sides of the carbs plumbed into
your plenum chamber?
2 Do you have the hot water/electric jackets fitted to the carbs to prevent carb
icing?
Best regards
Kingsley in Oz
Message 8
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| Subject: | Re: New engine runs a little rough when weather is cold. |
Thanks for the postings guys. Some answers:
1- The carb bowl vents are located in the plenum.
2- I have no provisions for carb heat since neither the stock Europa has it nor
Rotax provides it unless I go aftermarket.
3- The engine has 70 hours in it total but I did check the clutch at 25 hours.
51 NM (38 ft*lb). I can check it again.
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510092#510092
Message 9
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| Subject: | Re: New engine runs a little rough when weather is cold. |
Pull the plenum off and make sure both pistons are moving full stroke without any
binding; bit of dust may of found its way onto one of the piston bores.; should
move freely and full with a final clunk.
What altitude are you operating at? Does the vibration alter over 5000' variance?
Next time the vibration happens activate the choke at very small increments from
neutral position and see if the vibration alters any.
Does the engine idle quality/smoothness also alter?
Sounds like you are running avgas? Best plug colour is double shot late coffee;
light grey indicates lean; light grey yellow indicates water ingress... the difference
in plug colour between left right bank should be very marginal if not
any. Unleaded fuel should read tad sooty but clean.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510093#510093
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