Today's Message Index:
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0. 12:08 AM - What's Your Contribution Used For? (Matt Dralle)
1. 06:21 AM - Re: Re: CHT probes (Pete Krotje)
2. 05:04 PM - Re: Re: CHT probes (FLYaDIVE)
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| Subject: | What's Your Contribution Used For? |
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Message 1
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1 - The temps always read high and
Is this response meant to be serious? The probes read the temperatures that
are present. They don't read high or low - just what they are exposed to.
2 - They cause the spark plugs to run hot.
Not true at all. The spark plugs will heat up beyond their design range
only if there is a leak of combustion gas around the plug of cooling flow
the cowl is poor.
3 - Because of location the readings are not usable for comparison between
planes as a reference. EVEN with a plane also equipped with ring probes.
Just way too much of a difference in readings.
It's not because of the probe location that readings may be different from
plane to plane (within the normal variation from probe to probe) but
differences in cooling flow from plane to plane.
Pete
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of FLYaDIVE
Sent: Friday, November 09, 2012 10:36 PM
Subject: Re: JabiruEngine-List: Re: CHT probes
AHhhhh Got-cha Rick:
I would NOT use the Ring thermocouples under the spark plugs. As I
mentioned they are poor in two ways:
1 - The temps always read high and
2 - They cause the spark plugs to run hot.
Let's add a third reason-
3 - Because of location the readings are not usable for comparison between
planes as a reference. EVEN with a plane also equipped with ring probes.
Just way too much of a difference in readings.
You mentioned the other unit you used to compare temps; were were those
probes attached?
OK, since you are using Grounded probes they are usually a bit less
expensive. And they are more common.
Make sure ALL the probes use the SAME colored wire for the Ground
connection. Usually it is the WHITE wire, the RED one is the HOT and is
kept above Ground.
Go with the other unit and those readings. You have already noted the
variance between them is less.
Too many variables equals too many problems.
Barry
AirEupora <AirEupora@sbcglobal.net> wrote:
<AirEupora@sbcglobal.net>
The attachment point should have been provided by the engine manufacture.
It's a Jabiru 3300 engine! There they no attach point. The manufacture is
using the RING mount thermocouples
Does the voltmeter have a specific scale for temperature and it is set up
for K type probes? YES and YES. Scale is "Centigrade"
Also what is ACT? Actual readings from Voltmeter
Grounded.
Rick
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387366#387366
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ooks.com" target="_blank">www.buildersbooks.com
et="_blank">www.homebuilthelp.com
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Message 2
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Pete:
What I said is 100% correct. You did not read what I posted, you are
incorrect making assumptions.
Your understanding or spark plug operation is not correct. Look up
Champion Spark Plugs and find the video on how heat range is determined.
You will gain a better understanding of their operation and also why heat
is a lagging medium. Research Ring Type Thermocouples and you will also
gain an insight to their construction and how they do not give proper
reading when used under a spark plug.
Your statement on #3 would have been correct IF were
were comparing different planes and different engines - The comparison is
between different probes on the same engine in the same plane.
Barry
=================
On Mon, Nov 12, 2012 at 9:20 AM, Pete Krotje <pete@usjabiru.com> wrote:
> 1 - The temps always read high and****
>
> ** **
>
> Is this response meant to be serious? The probes read the temperatures
> that are present. They don=92t read high or low ' just what they are e
xposed
> to.****
>
> ** **
>
> 2 - They cause the spark plugs to run hot.****
>
> Not true at all. The spark plugs will heat up beyond their design range
> only if there is a leak of combustion gas around the plug of cooling flow
> the cowl is poor.****
>
> ** **
>
> 3 - Because of location the readings are not usable for comparison betwee
n
> planes as a reference. EVEN with a plane also equipped with ring probes.
> Just way too much of a difference in readings.****
>
> It=92s not because of the probe location that readings may be different f
rom
> plane to plane (within the normal variation from probe to probe) but
> differences in cooling flow from plane to plane.****
>
> ** **
>
> Pete****
>
> ** **
>
> *From:* owner-jabiruengine-list-server@matronics.com [mailto:
> owner-jabiruengine-list-server@matronics.com] *On Behalf Of *FLYaDIVE
> *Sent:* Friday, November 09, 2012 10:36 PM
> *To:* jabiruengine-list@matronics.com
> *Subject:* Re: JabiruEngine-List: Re: CHT probes****
>
> ** **
>
> AHhhhh Got-cha Rick:****
>
> ** **
>
> I would NOT use the Ring thermocouples under the spark plugs. As I
> mentioned they are poor in two ways:****
>
> 1 - The temps always read high and****
>
> 2 - They cause the spark plugs to run hot.****
>
> Let's add a third reason-****
>
> 3 - Because of location the readings are not usable for comparison betwee
n
> planes as a reference. EVEN with a plane also equipped with ring probes.
> Just way too much of a difference in readings.****
>
> ** **
>
> You mentioned the other unit you used to compare temps; were were those
> probes attached?****
>
> ** **
>
> OK, since you are using Grounded probes they are usually a bit less
> expensive. And they are more common.****
>
> ** **
>
> Make sure ALL the probes use the SAME colored wire for the Ground
> connection. Usually it is the WHITE wire, the RED one is the HOT and is
> kept above Ground.****
>
> ** **
>
> Go with the other unit and those readings. You have already noted
> the variance between them is less.****
>
> ** **
>
> Too many variables equals too many problems. ****
>
> ** **
>
> Barry****
>
> ** **
>
> ** **
>
> AirEupora <AirEupora@sbcglobal.net> wrote:****
>
> AirEupora@sbcglobal.net>
>
> The attachment point should have been provided by the engine manufacture.
> It=92s a Jabiru 3300 engine! There they no attach point. The manufacture
is
> using the RING mount thermocouples
>
>
> Does the voltmeter have a specific scale for temperature and it is set up
> for K type probes? YES and YES. Scale is =93Centigrade=94
>
> Also what is ACT? Actual readings from Voltmeter
>
> Grounded.
> Rick
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=387366#387366
>
>
> ==========
> ="_blank">www.aeroelectric.com
> ooks.com" target="_blank">www.buildersbooks.com
> et="_blank">www.homebuilthelp.com
> ="_blank">http://www.matronics.com/contribution
> le, List Admin.
> ==========
> -List" target="_blank">
> http://www.matronics.com/Navigator?JabiruEngine-List
> ==========
> http://forums.matronics.com
> ==========
>
>
> ****
>
> ** **
>
> * *
>
> * *
>
> **
>
> **
>
> **
>
> **
>
> **
>
> **
>
> **
>
> **
>
> *www.aeroelectric.com*
>
> *www.buildersbooks.com*
>
> *www.homebuilthelp.com*
>
> **
>
> *http://www.matronics.com/contribution*
>
> **
>
> **
>
> **
>
> **
>
> **
>
> **
>
> **
>
> *http://www.matronics.com/Navigator?JabiruEngine-List*
>
> **
>
> **
>
> *http://forums.matronics.com*
>
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