Today's Message Index:
----------------------
1. 04:25 PM - high oil and fuel pressure (John Brunke)
2. 04:58 PM - Re: high oil and fuel pressure (Jim Nolan)
3. 05:25 PM - Re: high oil and fuel pressure (Norman Younie)
4. 06:20 PM - Re: high oil and fuel pressure (tim greene)
5. 06:29 PM - Re: high oil and fuel pressure (Herron, Al)
6. 08:23 PM - Re: high oil and fuel pressure (James E. Clark)
7. 09:35 PM - High oil and fuel pressures (John Brunke)
8. 09:44 PM - Re: high oil and fuel pressure (John Brunke)
Message 1
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| Subject: | high oil and fuel pressure |
--> RV7-List message posted by: "John Brunke" <jwbrunk@attglobal.net>
Most of you folks are good at problem solving. I think I know the answer but here's
the situation.
Flew my RV-6 with an O-320 last week. Air temperature was 6 degrees F. Oil temp
never made it above 150 degrees. As I leveled off and the
fixed pitch prop rpm came up to normal cruise, the oil pressure came up to just
below or at red line and fluctuating about 2 to 3 psi. I reduced RPM to
1700 and slowly came back in to land and the pressure stayed around 85 psi (red
line is 90). In the pattern when my airspeed was back below
100 mph the oil pressure was in its normal range around 80psi.
Ok, it was a really cold day. So I'm thinking that the oil cooler was getting
too much air flow. I was able to block 1/2 of the air flow and flew a couple
of days later when it was in the high 30's. Flight went great.
Went flying today and the air temp was 23 degrees. Even with half the airflow
to the cooler blocked the pressure fluctuation up near red line occurred again.
This aircraft has Van's engine gauges and I was also venturing that the transducer
might be bad, but during these high oil pressure indications the fuel pressure
would also rise. They would rise at the same points. I'm concerned because redline
for fuel pressure is 8 psi and the indication at one point was 12 psi.
So, has anyone run into too much cooling for oil and if so did it also affect your
fuel pressure?
Also, I am concerned about the fuel pressure excursion above red line. What specifically
do you think I should check? I took the cowl off after today's flight
and did not notice any leaks.
The engine was about 45 degrees F when I started it. It is kept in a heated hanger
so the oil was not at ambient temperature when I started it.
I would appreciate your comments.
John Brunke
St. Charles, IL
Message 2
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| Subject: | Re: high oil and fuel pressure |
--> RV7-List message posted by: "Jim Nolan" <jamespnolan@earthlink.net>
First off, I doubt the vernitherm opened to let your oil cooler even be in
the circuit. Secondly, it's cold. Fuel pressure and oil pressure will be
higher with thicker substances to push.
Jim Nolan
1727 Briarwood Dr.
Warsaw, In 46580
----- Original Message -----
From: "John Brunke" <jwbrunk@attglobal.net>
Subject: RV7-List: high oil and fuel pressure
> --> RV7-List message posted by: "John Brunke" <jwbrunk@attglobal.net>
>
> Most of you folks are good at problem solving. I think I know the answer
but here's the situation.
>
> Flew my RV-6 with an O-320 last week. Air temperature was 6 degrees F.
Oil temp never made it above 150 degrees. As I leveled off and the
> fixed pitch prop rpm came up to normal cruise, the oil pressure came up to
just below or at red line and fluctuating about 2 to 3 psi. I reduced RPM
to
> 1700 and slowly came back in to land and the pressure stayed around 85 psi
(red line is 90). In the pattern when my airspeed was back below
> 100 mph the oil pressure was in its normal range around 80psi.
>
> Ok, it was a really cold day. So I'm thinking that the oil cooler was
getting too much air flow. I was able to block 1/2 of the air flow and flew
a couple
> of days later when it was in the high 30's. Flight went great.
>
> Went flying today and the air temp was 23 degrees. Even with half the
airflow to the cooler blocked the pressure fluctuation up near red line
occurred again.
>
> This aircraft has Van's engine gauges and I was also venturing that the
transducer might be bad, but during these high oil pressure indications the
fuel pressure
> would also rise. They would rise at the same points. I'm concerned
because redline for fuel pressure is 8 psi and the indication at one point
was 12 psi.
>
> So, has anyone run into too much cooling for oil and if so did it also
affect your fuel pressure?
>
> Also, I am concerned about the fuel pressure excursion above red line.
What specifically do you think I should check? I took the cowl off after
today's flight
> and did not notice any leaks.
>
> The engine was about 45 degrees F when I started it. It is kept in a
heated hanger so the oil was not at ambient temperature when I started it.
>
> I would appreciate your comments.
>
> John Brunke
> St. Charles, IL
>
>
Message 3
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| Subject: | Re: high oil and fuel pressure |
--> RV7-List message posted by: Norman Younie <rv6capt@pacificcoast.net>
Make sure that the grounds to the gages are good, if they are not
sometimes you can get faulty readings.
John Brunke wrote:
>--> RV7-List message posted by: "John Brunke" <jwbrunk@attglobal.net>
>
>Most of you folks are good at problem solving. I think I know the answer but
here's the situation.
>
>Flew my RV-6 with an O-320 last week. Air temperature was 6 degrees F. Oil temp
never made it above 150 degrees. As I leveled off and the
>fixed pitch prop rpm came up to normal cruise, the oil pressure came up to just
below or at red line and fluctuating about 2 to 3 psi. I reduced RPM to
>1700 and slowly came back in to land and the pressure stayed around 85 psi (red
line is 90). In the pattern when my airspeed was back below
>100 mph the oil pressure was in its normal range around 80psi.
>
>Ok, it was a really cold day. So I'm thinking that the oil cooler was getting
too much air flow. I was able to block 1/2 of the air flow and flew a couple
>of days later when it was in the high 30's. Flight went great.
>
>Went flying today and the air temp was 23 degrees. Even with half the airflow
to the cooler blocked the pressure fluctuation up near red line occurred again.
>
>This aircraft has Van's engine gauges and I was also venturing that the transducer
might be bad, but during these high oil pressure indications the fuel pressure
>would also rise. They would rise at the same points. I'm concerned because
redline for fuel pressure is 8 psi and the indication at one point was 12 psi.
>
>So, has anyone run into too much cooling for oil and if so did it also affect
your fuel pressure?
>
>Also, I am concerned about the fuel pressure excursion above red line. What specifically
do you think I should check? I took the cowl off after today's flight
>and did not notice any leaks.
>
>The engine was about 45 degrees F when I started it. It is kept in a heated hanger
so the oil was not at ambient temperature when I started it.
>
>I would appreciate your comments.
>
>John Brunke
>St. Charles, IL
>
>
>
>
Message 4
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| Subject: | Re: high oil and fuel pressure |
--> RV7-List message posted by: "tim greene" <tgreene5@cinci.rr.com>
What type/weight oil?
----- Original Message -----
From: "John Brunke" <jwbrunk@attglobal.net>
Subject: RV7-List: high oil and fuel pressure
> --> RV7-List message posted by: "John Brunke" <jwbrunk@attglobal.net>
>
> Most of you folks are good at problem solving. I think I know the answer
but here's the situation.
>
> Flew my RV-6 with an O-320 last week. Air temperature was 6 degrees F.
Oil temp never made it above 150 degrees. As I leveled off and the
> fixed pitch prop rpm came up to normal cruise, the oil pressure came up to
just below or at red line and fluctuating about 2 to 3 psi. I reduced RPM
to
> 1700 and slowly came back in to land and the pressure stayed around 85 psi
(red line is 90). In the pattern when my airspeed was back below
> 100 mph the oil pressure was in its normal range around 80psi.
>
> Ok, it was a really cold day. So I'm thinking that the oil cooler was
getting too much air flow. I was able to block 1/2 of the air flow and flew
a couple
> of days later when it was in the high 30's. Flight went great.
>
> Went flying today and the air temp was 23 degrees. Even with half the
airflow to the cooler blocked the pressure fluctuation up near red line
occurred again.
>
> This aircraft has Van's engine gauges and I was also venturing that the
transducer might be bad, but during these high oil pressure indications the
fuel pressure
> would also rise. They would rise at the same points. I'm concerned
because redline for fuel pressure is 8 psi and the indication at one point
was 12 psi.
>
> So, has anyone run into too much cooling for oil and if so did it also
affect your fuel pressure?
>
> Also, I am concerned about the fuel pressure excursion above red line.
What specifically do you think I should check? I took the cowl off after
today's flight
> and did not notice any leaks.
>
> The engine was about 45 degrees F when I started it. It is kept in a
heated hanger so the oil was not at ambient temperature when I started it.
>
> I would appreciate your comments.
>
> John Brunke
> St. Charles, IL
>
>
Message 5
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| Subject: | high oil and fuel pressure |
--> RV7-List message posted by: "Herron, Al" <Al.Herron@Aerojet.com>
Not a likely culprit since your temp/pressure readings seem to be related,
but I've had a false low temp reading in the past due to a badly placed
sensor (it was in the front of the oil pan in direct air blast). Oil temp
never showed above 100 deg even though the engine was operating normally.
Don't think it's a problem in your case but just something to check.
-----Original Message-----
From: owner-rv7-list-server@matronics.com
[mailto:owner-rv7-list-server@matronics.com]On Behalf Of John Brunke
Subject: RV7-List: high oil and fuel pressure
--> RV7-List message posted by: "John Brunke" <jwbrunk@attglobal.net>
Most of you folks are good at problem solving. I think I know the answer
but here's the situation.
Flew my RV-6 with an O-320 last week. Air temperature was 6 degrees F. Oil
temp never made it above 150 degrees. As I leveled off and the
fixed pitch prop rpm came up to normal cruise, the oil pressure came up to
just below or at red line and fluctuating about 2 to 3 psi. I reduced RPM
to
1700 and slowly came back in to land and the pressure stayed around 85 psi
(red line is 90). In the pattern when my airspeed was back below
100 mph the oil pressure was in its normal range around 80psi.
Ok, it was a really cold day. So I'm thinking that the oil cooler was
getting too much air flow. I was able to block 1/2 of the air flow and flew
a couple
of days later when it was in the high 30's. Flight went great.
Went flying today and the air temp was 23 degrees. Even with half the
airflow to the cooler blocked the pressure fluctuation up near red line
occurred again.
This aircraft has Van's engine gauges and I was also venturing that the
transducer might be bad, but during these high oil pressure indications the
fuel pressure
would also rise. They would rise at the same points. I'm concerned
because redline for fuel pressure is 8 psi and the indication at one point
was 12 psi.
So, has anyone run into too much cooling for oil and if so did it also
affect your fuel pressure?
Also, I am concerned about the fuel pressure excursion above red line. What
specifically do you think I should check? I took the cowl off after today's
flight
and did not notice any leaks.
The engine was about 45 degrees F when I started it. It is kept in a heated
hanger so the oil was not at ambient temperature when I started it.
I would appreciate your comments.
John Brunke
St. Charles, IL
Message 6
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| Subject: | high oil and fuel pressure |
--> RV7-List message posted by: "James E. Clark" <james@nextupventures.com>
Comments below ....
James
{SNIP}
|
| This aircraft has Van's engine gauges and I was also venturing that the
| transducer might be bad, but during these high oil pressure indications
| the fuel pressure
| would also rise. They would rise at the same points. I'm concerned
| because redline for fuel pressure is 8 psi and the indication at one
| point was 12 psi.
|
|
Hmmm ....
I would check the power, ground and sense wires to the gauges. During this
time was the electrical system otherwise doing fine?
Just a thought.
James
Message 7
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| Subject: | High oil and fuel pressures |
--> RV7-List message posted by: "John Brunke" <jwbrunk@attglobal.net>
Tim,
I use AeroShell 15/50
Message 8
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| Subject: | Re: high oil and fuel pressure |
--> RV7-List message posted by: "John Brunke" <jwbrunk@attglobal.net>
> James
>
>
> {SNIP}
>
>
> Hmmm ....
>
> I would check the power, ground and sense wires to the gauges. During this
> time was the electrical system otherwise doing fine?
>
> Just a thought.
>
> James
James,
The electrical system was working perfectly.
Just the way the guages were moving back and forth
in relatation to each other, I'm going to take a closer look
at the grounding situation up at the manifold. Maybe the lower temperatures
are contracting something enough to lose a good ground.
Thanks,
John Brunke
>
>
>
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