Today's Message Index:
----------------------
1. 04:34 AM - Cyl. Head Temperature Delta (Elmar & Manuela Hegenauer)
2. 04:53 AM - Re: Cyl. Head Temperature Delta (A. Dennis Savarese)
3. 06:46 AM - Re: Cyl. Head Temperature Delta (Dale)
4. 08:02 AM - Re: Re: Cyl. Head Temperature Delta (A. Dennis Savarese)
5. 08:25 AM - Re: Re: Cyl. Head Temperature Delta (Jan Mevis)
6. 08:36 AM - Re: Cyl. Head Temperature Delta (Dale)
7. 11:25 AM - Re: Cyl. Head Temperature Delta (Elmar & Manuela Hegenauer)
8. 11:44 AM - Re: Re: Cyl. Head Temperature Delta (Jan Mevis)
9. 11:49 AM - Re: Re: Cyl. Head Temperature Delta (doug sapp)
10. 02:42 PM - Smoke Oil (Yak Ron)
Message 1
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| Subject: | Cyl. Head Temperature Delta |
Does anybody know the cylinder head
temperature delta on YAK/Nanchang
engines between jug #1 and #4?
I always was under the impression
cylinder #4 runs the coolest due the
master rod but my gauges indicate
otherwise.
Thank you in advance.
cheers
Elmar
Message 2
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| Subject: | Re: Cyl. Head Temperature Delta |
Elmar,
I'm curious why you thought the cylinder with the master rod would run
cooler?
On the Yak 52's M14, my experience has been the upper cylinders,
typically 9, 1, 2 run a bit hotter than the other cylinders. I don't
remember the exact delta, but I do remember they always were hotter.
The readings were taken with a laser temperature probe. This may be due
to the fact that these cylinder are tucked behind the shroud on the top
of the cooling louver ring.
Now folks like Terry Slawinski that have the JPI 9 cylinder engine
analyzer would probably have much more accurate information since it
reads both CHT and EGT on all 9 cylinders.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 6/21/2012 6:31 AM, Elmar & Manuela Hegenauer wrote:
> <samira.h@shaw.ca>
>
> Does anybody know the cylinder head
> temperature delta on YAK/Nanchang
> engines between jug #1 and #4?
>
> I always was under the impression
> cylinder #4 runs the coolest due the
> master rod but my gauges indicate
> otherwise.
>
> Thank you in advance.
>
> cheers
>
> Elmar
>
>
Message 3
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| Subject: | Re: Cyl. Head Temperature Delta |
5 and 6 run the coolest followed by 4 and 7 then 3 and 8 then 9 and 1.
I think it's because the air can leave easily in the yak at least around the exhaust
pipe exist and the air going around the oil sump has a easy path out the
bottom. also the fuel gets pumped into the bottom of the engine and the first
cyls to get a bite are the bottom ones. My JPI shows it like a bell curve .
9 and 1 are always the hottest 5 and 6 always the coolest.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=376205#376205
Message 4
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| Subject: | Re: Cyl. Head Temperature Delta |
Based on a conversation I had this morning with Barrett Precision
Engines on this subject, the primary reason the lower cylinders run
cooler is because the fuel is vaporized better in the lower cylinders
than the upper cylinders. They have proven this in the test chamber
with their "mule" engine with the engine fully instrumented and running
both their fuel injection system AND with the standard carburetor.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 6/21/2012 8:43 AM, Dale wrote:
>
> 5 and 6 run the coolest followed by 4 and 7 then 3 and 8 then 9 and 1.
> I think it's because the air can leave easily in the yak at least around the
exhaust pipe exist and the air going around the oil sump has a easy path out the
bottom. also the fuel gets pumped into the bottom of the engine and the first
cyls to get a bite are the bottom ones. My JPI shows it like a bell curve
. 9 and 1 are always the hottest 5 and 6 always the coolest.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=376205#376205
>
>
Message 5
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| Subject: | Re: Cyl. Head Temperature Delta |
I've Aerospace Logic CHT probes on the front plugs of my M14R.
First thing: the temperatures that I measure on the front plug nr 4 are 35
degrees colder than the number 4 plug on the rear (CHT indicator of the
plane which I assume is correct).
Then indeed, cyl 6 is the coldest on my engine, closely followed by the nr
5.
But nr 3 is the hottest, immediately followed by nr 4. And the difference
between 6 and 3 goes up to 40, 45 degrees Celsius. On my engine, different
regimes, the number 3 always ends up being the hottest.
I don't have any precise data yet (figuring out a way how to copy them
while flying, but there's a serial data line on the instrument).
Jan
On 21/06/12 16:58, "A. Dennis Savarese" <dsavarese0812@bellsouth.net>
wrote:
><dsavarese0812@bellsouth.net>
>
>Based on a conversation I had this morning with Barrett Precision
>Engines on this subject, the primary reason the lower cylinders run
>cooler is because the fuel is vaporized better in the lower cylinders
>than the upper cylinders. They have proven this in the test chamber
>with their "mule" engine with the engine fully instrumented and running
>both their fuel injection system AND with the standard carburetor.
>
>Dennis
>
>
>A. Dennis Savarese
>334-285-6263
>334-546-8182 (mobile)
>www.yak-52.com
>Skype - Yakguy1
>
>On 6/21/2012 8:43 AM, Dale wrote:
>>
>> 5 and 6 run the coolest followed by 4 and 7 then 3 and 8 then 9 and 1.
>> I think it's because the air can leave easily in the yak at least
>>around the exhaust pipe exist and the air going around the oil sump has
>>a easy path out the bottom. also the fuel gets pumped into the bottom
>>of the engine and the first cyls to get a bite are the bottom ones. My
>>JPI shows it like a bell curve . 9 and 1 are always the hottest 5 and 6
>>always the coolest.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=376205#376205
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 6
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| Subject: | Re: Cyl. Head Temperature Delta |
During my loooong dealings with this matter I also learned that apparently the
intake pipes in relation to the fuel delivery from the carb has a direct effect
on the M-14 . Some US radial engine makers offset the intakes in relation to
the initial fuel air delivery to so-call bypass some of the cylinders to even
out the spread of fuel in a attempt to minimize this issue.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=376212#376212
Message 7
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| Subject: | Re: Cyl. Head Temperature Delta |
Hi again,
thank you very much for your input
and thoughts on this matter, much
appreciated.
Years ago someone on the list stated
that cylinder No. 4 runs the coolest
due the greater mass of the master rod,
hence better heat dissipation.
My extension leads were decayed to a
degree where replacement was absolutely
necessary.
I couldn't find any original leads (russian
GOST standard) so I had to buy US CHT
gauges including extensions and thermocouples.
These have been installed according to
the maintenance book - front cockpit
gauges connected to cyl. #4 and rear
cockpit to cyl. #1.
Now my gauges show a delta of 25 degrees
Celsius with no. 4 being the hotter one.
Thanks again and Blue Skies.
cheers
Elmar
Message 8
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| Subject: | Re: Cyl. Head Temperature Delta |
This is also in the line of what I see: 4 is the second hottest, and 1 is
in between the coldest (nr 6) and the hottest (nr 3).
So this delta of 25 degrees is also what I measure, (with a difference of
a few degrees).
Jan
On 21/06/12 20:22, "Elmar & Manuela Hegenauer" <samira.h@shaw.ca> wrote:
><samira.h@shaw.ca>
>
>Hi again,
>
>thank you very much for your input
>and thoughts on this matter, much
>appreciated.
>
>Years ago someone on the list stated
>that cylinder No. 4 runs the coolest
>due the greater mass of the master rod,
>hence better heat dissipation.
>
>My extension leads were decayed to a
>degree where replacement was absolutely
>necessary.
>
>I couldn't find any original leads (russian
>GOST standard) so I had to buy US CHT
>gauges including extensions and thermocouples.
>
>These have been installed according to
>the maintenance book - front cockpit
>gauges connected to cyl. #4 and rear
>cockpit to cyl. #1.
>
>Now my gauges show a delta of 25 degrees
>Celsius with no. 4 being the hotter one.
>
>Thanks again and Blue Skies.
>
>cheers
>
>Elmar
>
>
Message 9
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| Subject: | Re: Cyl. Head Temperature Delta |
Elmar,
I stock P/N 5SH.422.001 which is the Chinese CHT thermo couple lead, 7 feet
long. It has the connections on one end to accept the CHT probe wires and
has the gauge plug on the other end.
Best,
Doug
On Thu, Jun 21, 2012 at 11:22 AM, Elmar & Manuela Hegenauer <
samira.h@shaw.ca> wrote:
> samira.h@shaw.ca>
>
> Hi again,
>
> thank you very much for your input
> and thoughts on this matter, much
> appreciated.
>
> Years ago someone on the list stated
> that cylinder No. 4 runs the coolest
> due the greater mass of the master rod,
> hence better heat dissipation.
>
> My extension leads were decayed to a
> degree where replacement was absolutely
> necessary.
>
> I couldn't find any original leads (russian
> GOST standard) so I had to buy US CHT
> gauges including extensions and thermocouples.
>
> These have been installed according to
> the maintenance book - front cockpit
> gauges connected to cyl. #4 and rear
> cockpit to cyl. #1.
>
> Now my gauges show a delta of 25 degrees
> Celsius with no. 4 being the hotter one.
>
> Thanks again and Blue Skies.
>
> cheers
>
> Elmar
>
>
Message 10
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Got a couple full 55 gal barrels of smoke oil(aeroshell vitrea 22) left over from
airshow in 2011. Let me know if interested. $250 a barrel....you ship or pick
up. Seward Airport Nebr.....Yak Ron
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=376251#376251
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