 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
cole(at)san.rr.com
Guest
|
 Posted: Wed Mar 12, 2008 6:48 pm Post subject: JPI vs EI Probes |
 |
|
Gary,
I read with interest your article in the latest Star about the
differences in the JPI and EI CHT probes. I have a JPI EDM 700, so can
I now happily drill through the sky with readings of 430-450 deg F in
cruise when this seemingly equates to a Lycoming equivalent of below
400? That would make my life a lot faster and greener (I could fly at
higher airspeed and leaner)!
Also, I wonder how to explain that #2 reads in line with the others
yet it is a ring-around-the-spark-plug probe. Perhaps this is one of
the hottest places on the cylinder, or like the other probes, is
reading the temp of the aluminum, not the air inside the probe cavity.
If so, on engines with EI probes, does #2 read significantly higher
than the others?
Steve K
Tiger N3SK
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
|
|
| Back to top |
|
 |
marc(at)skymachines.com
Guest
|
| Posted: Wed Mar 12, 2008 7:08 pm Post subject: JPI vs EI Probes |
|
|
| Quote: | can I now happily drill through the sky with
readings of 430-450 deg F in cruise when this seemingly
equates to a Lycoming equivalent of below 400?
|
Who cares? The point is, Grummans still run hotter than a great many other
aircraft, and that's not right. As someone who was never able to track down
or reduce his 450-deg. cruise CHT's, and suffered a total top overhaul at
750 hrs., I say accepting our CHT's to be higher than other airplanes and
saying, "It's just a measurement problem" is hiding our heads in the sand.
We need to fix the problem, either with new cowl designs or cowl flaps.
By the way, I remember one of my mechanics beaming a laser temperature
thermometer right at the heads after I shut down from a flight, while I read
him the readings on the EDM-700 from the cockpit. It's been about 8 years,
but I recall being surprised that the two were within a couple of degrees of
each other. It's easy enough for all of us to do a similar test...
Marc Coan,
Taos, NM
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
|
|
| Back to top |
|
|
GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
|
| Posted: Wed Mar 12, 2008 9:32 pm Post subject: JPI vs EI Probes |
|
|
Keep the CHTs under 420 in cruise. Keep them under 470 in climb. Replace the spark plug gasket thermal couple with the one that goes in the well.
--
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
_________________
Gary
AuCountry Aviation
Home of Team Grumman |
|
| Back to top |
|
|
GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
|
| Posted: Wed Mar 12, 2008 9:33 pm Post subject: JPI vs EI Probes |
|
|
There is no cooling problem in the Grummans. If the air flow were insufficient for proper cooling, the 260 hp 6 cylinder engined Grummans would have a lot of cooling problems. They don't. It's a myth that the Grummans run hotter than any other plane.
--
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
_________________
Gary
AuCountry Aviation
Home of Team Grumman |
|
| Back to top |
|
|
marc(at)skymachines.com
Guest
|
| Posted: Thu Mar 13, 2008 6:04 am Post subject: JPI vs EI Probes |
|
|
> There is no cooling problem in the Grummans. If the air flow were insufficient for proper cooling, the 260 hp 6 cylinder engined Grummans would have a lot of cooling problems. They don't. It's a myth that the Grummans run hotter than any other plane.
Ouch. My pocketbook would disagree. So, what's the solution to cylinders in the 450 range at cruise?
Marc Coan,
Taos, NM
[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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
|
|
| Back to top |
|
|
GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
|
| Posted: Thu Mar 13, 2008 10:40 am Post subject: JPI vs EI Probes |
|
|
If you are running 450 in cruise, then your baffles are not doing their job. send me some pics, detailed pics, of the top and bottom (where they are tied to the bottom of the engine.)
--
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
_________________
Gary
AuCountry Aviation
Home of Team Grumman |
|
| Back to top |
|
|
marc(at)skymachines.com
Guest
|
| Posted: Thu Mar 13, 2008 11:02 am Post subject: JPI vs EI Probes |
|
|
No, I sold the airplane. But man did we play with baffling a lot.
[quote] From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of teamgrumman(at)aol.com
Sent: Thursday, March 13, 2008 12:37 PM
To: teamgrumman-list(at)matronics.com
Subject: Re: JPI vs EI Probes
If you are running 450 in cruise, then your baffles are not doing their job. send me some pics, detailed pics, of the top and bottom (where they are tied to the bottom of the engine.)
-----Original Message-----
From: SkyMachines <marc(at)skymachines.com>
To: teamgrumman-list(at)matronics.com
Sent: Thu, 13 Mar 2008 7:01 am
Subject: RE: JPI vs EI Probes
> There is no cooling problem in the Grummans. If the air flow were insufficient for proper cooling, the 260 hp 6 cylinder engined Grummans would have a lot of cooling problems. They don't. It's a myth that the Grummans run hotter than any other plane.
Ouch. My pocketbook would disagree. So, what's the solution to cylinders in the 450 range at cruise?
Marc Coan,
Taos, NM
| Quote: |
or?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
p://forums.matronics.com
ution">http://www.matronics.com/contribution
|
Supercharge your AIM. Get the AIM toolbar for your browser.
| Quote: |
href="http://www.matronics.com/Navigator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
|
[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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
|
|
| Back to top |
|
|
GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
|
| Posted: Thu Mar 13, 2008 12:51 pm Post subject: JPI vs EI Probes |
|
|
how many hours did you have on the cylinders you think failed do to improper cooling?
--
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
_________________
Gary
AuCountry Aviation
Home of Team Grumman |
|
| Back to top |
|
|
marc(at)skymachines.com
Guest
|
| Posted: Thu Mar 13, 2008 1:14 pm Post subject: JPI vs EI Probes |
|
|
I think there was 750.
[quote] From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of teamgrumman(at)aol.com
Sent: Thursday, March 13, 2008 2:49 PM
To: teamgrumman-list(at)matronics.com
Subject: Re: JPI vs EI Probes
how many hours did you have on the cylinders you think failed do to improper cooling?
--
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
