Today's Message Index:
----------------------
1. 05:26 AM - Re: Install Manifold Pressure? (Gary Casey)
2. 07:21 AM - Re: Re: Install Manifold Pressure? (n223b@comcast.net)
Message 1
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| Subject: | Re: Install Manifold Pressure? |
--> Engines-List message posted by: "Gary Casey" <glcasey@adelphia.net>
<<My manifold pressure line is connected to the existing Lycoming primer
port
tap on the number 4 cylinder. I am told it is a standard plumbing NPT
(national pipe thread) thread pattern.
P.S. The primer is only piped to the two cylinders on the other side of the
engine. The remaining primer port is plugged.>>
Yes, it is a standard 1/8 pipe thread. Some people feel it is desirable to
run primer lines to all cylinders, which eliminates the port that could be
used for MAP. Also, connecting the MAP to a common point in the plenum will
give a more representative pressure with less pulsations. This was actually
certified as a service bulletin on the Cessna TR182 as a fix for a pulsating
gauge. Problem is on a lot of engines there is no port available to do this
without making one. Not hard to do, but with a certified installation not
likely to be approved.
Gary Casey
Message 2
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| Subject: | Re: Install Manifold Pressure? |
--> Engines-List message posted by: n223b@comcast.net
Actually, on some engines there is a drain port that is normally plugged at the
low point on the intake plenum. Don't use this is a manifold pressure port.
Amazingly, engine oil, probably from the intake guides, accumulates at the bottom
of the intake manifold. If you tap into your intake manifold at the bottom
you'll eventually get oil in your manifold pressure sensing apparatus. Oil
in the MP system may or may not be a problem but I don't think its worth the
risk.
Bob
-------------- Original message --------------
> --> Engines-List message posted by: "Gary Casey"
>
> <> port
> tap on the number 4 cylinder. I am told it is a standard plumbing NPT
> (national pipe thread) thread pattern.
> P.S. The primer is only piped to the two cylinders on the other side of the
> engine. The remaining primer port is plugged.>>
>
> Yes, it is a standard 1/8 pipe thread. Some people feel it is desirable to
> run primer lines to all cylinders, which eliminates the port that could be
> used for MAP. Also, connecting the MAP to a common point in the plenum will
> give a more representative pressure with less pulsations. This was actually
> certified as a service bulletin on the Cessna TR182 as a fix for a pulsating
> gauge. Problem is on a lot of engines there is no port available to do this
> without making one. Not hard to do, but with a certified installation not
> likely to be approved.
>
> Gary Casey
>
>
>
>
>
>
Actually, on some engines there is a drain port that is normally plugged at the
low point on the intake plenum. Don't use this is a manifold pressure port. Amazingly,
engine oil, probably from the intake guides, accumulates at the bottom
of the intake manifold. If you tap into your intake manifold at the bottom
you'll eventually get oil in your manifold pressure sensing apparatus. Oil in
the MP system may or may not be a problem but I don't think its worth the risk.
Bob
-------------- Original message --------------
-- Engines-List message posted by: "Gary Casey" <GLCASEY@ADELPHIA.NET>
<MY
port
tap on the number 4 cylinder. I am told it is a standard plumbing NPT
(national pipe thread) thread pattern.
P.S. The primer is only piped to the two cylinders on the other side of the
engine. The remaining primer port is plugged.
Yes, it is a standard 1/8 pipe thread. Some people feel it is desirable to
run primer lines to all cylinders, which eliminates the port that could be
used for MAP. Also, connecting the MAP to a common point in the plenum will
give a more representative pressure with less pulsations. This was actually
certified as a service bullet
in on the Cessna TR182 as a fix for a pulsating
gauge. Problem is on a lot of engines there is no port available to do this
without making one. Not hard to do, but with a certified installation not
likely to be approved.
Gary Casey
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