Today's Message Index:
----------------------
1. 10:54 AM - M14P hot cylinders (Sylvain April)
2. 01:55 PM - Re: M14P hot cylinders (Anthony Savarese)
3. 04:24 PM - Re: M14P hot cylinders (Mark Bitterlich)
Message 1
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| Subject: | M14P hot cylinders |
Hi,
I have been helping a friend with a high temperature of the cylinder heads
on his M14P engine,
The engine is installed in a Murphy Moose and the upper cylinders are getin
g hoter than the lower cylinders.
25 to 30 Deg C. Hoter than the lower cylinders.
The bafling is tight and there is no obstruction behind the cylinder heads
to the passage of cooling air.
We have added ample cheeks to the cowling and we have re centered the fro
nt of the cowling that was a little low and was providing a larger opening
below the prop spinner than above it. It did improve the cooling of the upp
er cylinders but we still have a big difference between the upper cylinder
heads and the lower cylinders head.
Here are the reading from the MGL instrument that we bench checked with boi
ling water.
#1 :224 C
#2 :217 C
#3 :208 C
#4 :196 C
#5 :193 C
#6 :195 C
#7 :201 C
#8 :205 C
#9 :201C
On a warmer day after climbing.
#1 :242C
#2 :241C
#3 :234C
#4 :217C
#5 :216C
#6 :215C
#7 :221C
#8 :230C
#9 :223C
The oil temperature stay at 150 to 155 Deg F and the o=EFl pressure is sta
ying 75 to 80 PSI.
>From another Moose I used to fly the o=EFl temperature reach 185 Deg F to 1
95 F. And the o=EFl pressure stay around 65 PSI.
The upper cylinders where also warmer in that Moose but not as much differe
nce with the lower cylinders.
When I look at the cold oil temperature and relatively high o=EFl pressure
I Wonder if the o=EFl is doing it=92job of removing the heat of the engine,
I mean the oil jet on the crank not spraying the cylinders. All cylinders
are geting dripping o=EFl from the crank but the lower cylinders would Alwa
ys get more o=EFl due to the gravity and would be cooler.
In cruse the temps are aceptable but there must be a reason for this 30 Deg
C.difference.
Any idea would be greatly appreciated.
Thanks
Sylvain April
Envoy=E9 =E0 partir de Courrier<https://go.microsoft.com/fwlink/?LinkId=5
50986> pour Windows
Message 2
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| Subject: | Re: M14P hot cylinders |
As a second test and disregarding the MGL instrument, immediately, and I me
an immediately upon shutdown, using a laser temperature sensor point the las
er at the exact same point on each cylinder and read the temps. I suggest at
the flat surface around the base of each spark plug just outside the spark p
lug insert. Make note of the temps on each cylinder and compare them to the d
ifferences between the cylinder temps you=99re seeing from the MGL.
DENNIS
Sent from my iPhone
> On Sep 25, 2021, at 1:56 PM, Sylvain April <sapril001@hotmail.com> wrote:
>
> =EF=BB
> Hi,
>
> I have been helping a friend with a high temperature of the cylinder heads
on his M14P engine,
>
> The engine is installed in a Murphy Moose and the upper cylinders are geti
ng hoter than the lower cylinders.
> 25 to 30 Deg C. Hoter than the lower cylinders.
> The bafling is tight and there is no obstruction behind the cylinder heads
to the passage of cooling air.
> We have added ample cheeks to the cowling and we have re centered the fr
ont of the cowling that was a little low and was providing a larger opening b
elow the prop spinner than above it. It did improve the cooling of the upper
cylinders but we still have a big difference between the upper cylinder hea
ds and the lower cylinders head.
> Here are the reading from the MGL instrument that we bench checked with bo
iling water.
>
> #1 :224 C
> #2 :217 C
> #3 :208 C
> #4 :196 C
> #5 :193 C
> #6 :195 C
> #7 :201 C
> #8 :205 C
> #9 :201C
>
> On a warmer day after climbing.
>
> #1 :242C
> #2 :241C
> #3 :234C
> #4 :217C
> #5 :216C
> #6 :215C
> #7 :221C
> #8 :230C
> #9 :223C
>
> The oil temperature stay at 150 to 155 Deg F and the o=C3=AFl pressure is
staying 75 to 80 PSI.
> =46rom another Moose I used to fly the o=C3=AFl temperature reach 185 Deg
F to 195 F. And the o=C3=AFl pressure stay around 65 PSI.
> The upper cylinders where also warmer in that Moose but not as much differ
ence with the lower cylinders.
>
> When I look at the cold oil temperature and relatively high o=C3=AFl press
ure I Wonder if the o=C3=AFl is doing it=99job of removing the heat of
the engine, I mean the oil jet on the crank not spraying the cylinders. All
cylinders are geting dripping o=C3=AFl from the crank but the lower cylinde
rs would Always get more o=C3=AFl due to the gravity and would be cooler.
> In cruse the temps are aceptable but there must be a reason for this 30 De
g C.difference.
>
> Any idea would be greatly appreciated.
>
> Thanks
> Sylvain April
>
>
>
>
> Envoy=C3=A9 =C3- partir de Courrier pour Windows
>
Message 3
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| Subject: | M14P hot cylinders |
May I add a small point not to interfere with Dennis=99s
suggestion, but in fact supporting it?
One of the things that has bit me in the tail more times than I can
count in my field of expertise is believing everything that I see on a
piece of test equipment as gospel. Meaning, I see a reading of voltage,
current, resistance, temperature, pressure you name it
and I *ASSUME* it must be perfectly accurate. Surprise.
Oftentimes it is not, due to a huge variety of reasons.
Oil temps on the M-14 vary quite a bit depending on where they are
measured from, CHT same thing, and the list goes on. Very simply,
before you think there is something wrong with the engine, first ask
yourself how well it is running, then never forget to cast a sharp
glance at the accuracy of the readings you are taking.
My 2 cents.
Mark Bitterlich
YAK-50 N50YK
SM.1019 N4756
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of
Anthony Savarese
Sent: Saturday, September 25, 2021 4:55 PM
Subject: Re: M14PEngines-List: M14P hot cylinders
As a second test and disregarding the MGL instrument, immediately, and
I mean immediately upon shutdown, using a laser temperature sensor point
the laser at the exact same point on each cylinder and read the temps. I
suggest at the flat surface around the base of each spark plug just
outside the spark plug insert. Make note of the temps on each cylinder
and compare them to the differences between the cylinder temps
you=99re seeing from the MGL.
DENNIS
Sent from my iPhone
On Sep 25, 2021, at 1:56 PM, Sylvain April <sapril001@hotmail.com>
wrote:
=EF=BB
Hi,
I have been helping a friend with a high temperature of the cylinder
heads on his M14P engine,
The engine is installed in a Murphy Moose and the upper cylinders are
geting hoter than the lower cylinders.
25 to 30 Deg C. Hoter than the lower cylinders.
The bafling is tight and there is no obstruction behind the cylinder
heads to the passage of cooling air.
We have added ample cheeks to the cowling and we have re centered the
front of the cowling that was a little low and was providing a larger
opening below the prop spinner than above it. It did improve the cooling
of the upper cylinders but we still have a big difference between the
upper cylinder heads and the lower cylinders head.
Here are the reading from the MGL instrument that we bench checked with
boiling water.
#1 :224 C
#2 :217 C
#3 :208 C
#4 :196 C
#5 :193 C
#6 :195 C
#7 :201 C
#8 :205 C
#9 :201C
On a warmer day after climbing.
#1 :242C
#2 :241C
#3 :234C
#4 :217C
#5 :216C
#6 :215C
#7 :221C
#8 :230C
#9 :223C
The oil temperature stay at 150 to 155 Deg F and the o=C3=AFl pressure
is staying 75 to 80 PSI.
>From another Moose I used to fly the o=C3=AFl temperature reach 185 Deg
F to 195 F. And the o=C3=AFl pressure stay around 65 PSI.
The upper cylinders where also warmer in that Moose but not as much
difference with the lower cylinders.
When I look at the cold oil temperature and relatively high o=C3=AFl
pressure I Wonder if the o=C3=AFl is doing it=99job of removing
the heat of the engine, I mean the oil jet on the crank not spraying the
cylinders. All cylinders are geting dripping o=C3=AFl from the crank but
the lower cylinders would Always get more o=C3=AFl due to the gravity
and would be cooler.
In cruse the temps are aceptable but there must be a reason for this 30
Deg C.difference.
Any idea would be greatly appreciated.
Thanks
Sylvain April
Envoy=C3=A9 =C3- partir de Courrier
<https://go.microsoft.com/fwlink/?LinkId=550986> pour Windows
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