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Firedog(at)visi.com
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 Posted: Tue Jun 04, 2013 3:23 pm Post subject: Reduced manifold pressure |
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Hi all…It has quit snowing in MN and we’re flying again….
During the last few flights in my CJ (285 hp), I have noticed that the manifold pressure on take-off only going up to 720.
I’m positive that in the past, it would go to 800 and I would back it down to 700 during climb out.
Yesterday, during a XC, I was seemingly limited to 660…and was sluggish on TO as well.
Today, 720 on TO.
Got a hop scheduled for Thursday and want to be safe.
Thoughts? Comments?
Always appreciated.
Thanks,
ras
Dr. Robert A. Schroeder
Schroeder Fire Inc.
612.922.2349
[quote][b]
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viperdoc(at)mindspring.co
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| Posted: Wed Jun 05, 2013 8:51 pm Post subject: Reduced manifold pressure |
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Check the tightness on the gland nuts on your intake tubes. Especially at the base going into the ( coming out of) the supercharger. Check the tightness on your manifold pressure lines at the firewall and the top of the supercharger. How old is that hose.
Have you calibrated your gauge? Is the RCP gauge reading the same?
Doc
Sent from my iPad
On Jun 4, 2013, at 6:21 PM, "Dr. Robert Schroeder" <Firedog(at)visi.com (Firedog(at)visi.com)> wrote:
[quote] <![endif]--> <![endif]-->
Hi all…It has quit snowing in MN and we’re flying again….
During the last few flights in my CJ (285 hp), I have noticed that the manifold pressure on take-off only going up to 720.
I’m positive that in the past, it would go to 800 and I would back it down to 700 during climb out.
Yesterday, during a XC, I was seemingly limited to 660…and was sluggish on TO as well.
Today, 720 on TO.
Got a hop scheduled for Thursday and want to be safe.
Thoughts? Comments?
Always appreciated.
Thanks,
ras
Dr. Robert A. Schroeder
Schroeder Fire Inc.
612.922.2349
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Firedog(at)visi.com
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| Posted: Fri Jun 07, 2013 2:27 am Post subject: Reduced manifold pressure |
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Thanks Doc…I will be digging into it Monday..didn’t fly yesterday due to Wx and concern about the manifold problem.
All the best,
ras
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Roger Kemp M.D.
Sent: Wednesday, June 05, 2013 11:50 PM
To: yak-list(at)matronics.com
Subject: Re: Reduced manifold pressure
Check the tightness on the gland nuts on your intake tubes. Especially at the base going into the ( coming out of) the supercharger. Check the tightness on your manifold pressure lines at the firewall and the top of the supercharger. How old is that hose.
Have you calibrated your gauge? Is the RCP gauge reading the same?
Doc
Sent from my iPad
On Jun 4, 2013, at 6:21 PM, "Dr. Robert Schroeder" <Firedog(at)visi.com (Firedog(at)visi.com)> wrote:
| Quote: |
Hi all…It has quit snowing in MN and we’re flying again….
During the last few flights in my CJ (285 hp), I have noticed that the manifold pressure on take-off only going up to 720.
I’m positive that in the past, it would go to 800 and I would back it down to 700 during climb out.
Yesterday, during a XC, I was seemingly limited to 660…and was sluggish on TO as well.
Today, 720 on TO.
Got a hop scheduled for Thursday and want to be safe.
Thoughts? Comments?
Always appreciated.
Thanks,
ras
Dr. Robert A. Schroeder
Schroeder Fire Inc.
612.922.2349
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[quote][b]
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keithmckinley
Joined: 11 Aug 2008
Posts: 434
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| Posted: Sun Jun 30, 2013 9:24 pm Post subject: Re: Reduced manifold pressure |
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The real question is what does that gauge read on the deck engine off (both cockpits).
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