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teamgrumman(at)yahoo.com
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 Posted: Wed Aug 31, 2011 9:33 am Post subject: Cylinder Head Temps |
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Seriously, if you just want to see lower CHTs, remove the JPI and install and EI. It's that simple.
Flat out cruise at 2500 feet, leaned, you should see something in the neighborhood of 440 on a JPI.
Climb-out on a hot day, keep the temps below 470. Start addressing the problem when the CHT get to 450 and the JPI starts flashing.
Low power cruise: expect something in the high 300's.
==========
I've tried everything to make the JPI indicate lower. JPIs have grounded probes. They are seeing temps referenced to a common ground. EIs have ungrounded probes. They use the temperature of the EI unit itself as a reference temperature. JPIs probes touch aluminum. EI probes don't. Maybe that affects it, maybe not. Bottom line: JPIs read higher than EIs.
From: busdriver <clmiller(at)netzero.net>
To: teamgrumman-list(at)matronics.com
Sent: Saturday, July 17, 2010 1:47 PM
Subject: Cylinder Head Temps
--> TeamGrumman-List message posted by: "busdriver" <clmiller(at)netzero.net (clmiller(at)netzero.net)>
What should the cylinder head temperatures indicate on a later model AG5B with good seals/ baffles? Everything I have read says to keep the CHT’s below 400 degrees, but I am not having much success. #4 is running 420- 430 in the climb with #3 not far behind- I am using a brand new JPI EDM-700 for monitoring. I’m climbing full throttle and full rich mixture at 100kts+ airspeed. Even in cruise, the temps don’t decrease significantly… is this normal for a Tiger?
Read this topic online here:
http://forums.matronics.coTeamGrumman-List" target="_blank">http://www.matronics.com/Navigator?Teamsp; - MATRONICS WEB FORUMS -
= --> <a href="http://forums.matronics.com" target="_blank"p; -Matt Dralle, List=========
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bhauskne(at)gmail.com
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| Posted: Wed Aug 31, 2011 10:28 am Post subject: Cylinder Head Temps |
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Thanks, Gary. I thought I remember reading this but had not researched the Archives. I have the JPI and try to keep the max CHT under about 415 when near redline RPM at altitude in my '77 Tiger with no power flow. Adding a bit of richer mixture keeps the CHT in check while preserving power (RPM). Glad to get confirmation that the JPI reads higher than EI. Cheers!--Brian
Brian Hausknechtbhauskne(at)gmail.comwww.brianflys.netwww.brianflys.comSent from my BlackberryFrom: Gary Vogt <teamgrumman(at)yahoo.com>
Sender: owner-teamgrumman-list-server(at)matronics.com
Date: Wed, 31 Aug 2011 10:31:13 -0700 (PDT)
To: teamgrumman-list(at)matronics.com<teamgrumman-list(at)matronics.com>
ReplyTo: teamgrumman-list(at)matronics.com
Subject: Re: TeamGrumman-List: Cylinder Head Temps
Seriously, if you j= ust want to see lower CHTs, remove the JPI and install and EI. It's t= hat simple.
Flat out cru= ise at 2500 feet, leaned, you should see something in the neighborhood of 4= 40 on a JPI.
Climb-out o= n a hot day, keep the temps below 470. Start addressing the problem w= hen the CHT get to 450 and the JPI starts flashing.
=
Low power cruise: expect something in the high = 300's.
=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D
I've tried everything to make the JP= I indicate lower. JPIs have grounded probes. They are seeing te= mps referenced to a common ground. EIs have ungrounded probes. = They use the temperature of the EI unit itself as a reference temperature.  = ;JPIs probes touch aluminum. EI probes don't. Maybe that affect= s it, maybe not. Bottom line: JPIs read higher than EIs.
<= div>
From: busdriver <= clmiller(at)netzero.net>
To: teamgrumman-list(at)matronics.com
Sent: Saturday, July 17, 2010 1:47 PM
Subject: TeamGrumman-List: Cylinder Head Temps=
--> TeamGrumman-List message posted by: "busdriver" <<= a ymailto=3D"mailto:clmiller(at)netzero.net" href=3D"mailto:clmiller(at)netzero.net">clmiller(at)netzero.net>
W= hat should the cylinder head temperatures indicate on a later model AG5B wi= th good seals/ baffles? Everything I have read says to keep the CHT= =C3=A2=E2=82=AC=E2=84=A2s below 400 degrees, but I am not having much succe= ss. #4 is running 420- 430 in the climb with #3 not far behind- I am = using a brand new JPI EDM-700 for monitoring. I=C3=A2=E2=82=AC=E2=84= =A2m climbing full throttle and full rich mixture at 100kts+ airspeed. = ; Even in cruise, the temps don=C3=A2=E2=82=AC=E2=84=A2t decrease significa= ntly=C3=A2=E2=82=AC=C2=A6 is this normal for a Tiger?
Re= ad this topic online here:
http://forums.matronics.co= TeamGrumman-List" target=3D"_blank">http://www.matronics.com/Navigator?Team= sp; - MATRONICS WEB FORUMS -
= =3D --> [quote][b]
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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