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0. 12:12 AM - Make A List Contribution - It's Your Personal Squelch Button... (Matt Dralle)
1. 05:11 PM - Re: CHT probes (AirEupora)
2. 09:34 PM - Re: Re: CHT probes (FLYaDIVE)
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| Subject: | Make A List Contribution - It's Your Personal Squelch |
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Message 1
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Heat Seeker 1:
When you say GASKET type probes. Are youreferringto the RING mount thermocouples
that go under the spark plug? YES
And what are you referring to when you say "NEW voltmeter with'K' type probe"?Sinometer
w/bead wire type k themocouple
Your statements bring up ALL SORTS OF ISSUES because:
1 - The RING type thermocouples ALWAYS READ HIGHER than cylinder hear (DRILLED
& MOUNTED) PROBES. They are picking up the heatdissipationof the spark plug AND
they are lowering the heat transfer between the spark plug and the cylinder
head. Neither case is good. Get rid of RING type thermocouples.
I'd love to, but who sales the type you are suggesting and where are you attaching
it.
Because of ring type spark plugs will change the operational temp range. They will
go UP. Because heat transfer is poor with the ringcoupler.
2 - You use the statement"NEW voltmeter with'K' type probe" - K type probes ARE
NOT VOLTAGE items. They are CURRENT probes. They produce a very small current
and if you are using a volt meter to read them your numbers will not be correct.
What I'm doing is reading the voltmeter to get the temperature off of the head
(ACT) then reading the EFIS.(MGL)
3 - CHT & EGT areREFERENCEtemperatures. Unless you have a lab type unit wheredifferencesin
probes can be zeroed out there will bedifferencesin readings. Differencesthat
relate to: a> Length of probe wire. b> How the probe was made; twisted,
soldered, or welded. c> Calibration of the readout head. d> Even the number
of twists can change the readings.
I understand this. I'm asking if anybody has had this much of a problem using
CHT and the MGL EMS.
4 - There are alsodifferencesin probes as far as GROUNDED and UN-GROUNDED. You
can NOT mix the two. Do yo knowexactlywhat each prop is?
I have K type probes, if that is what you are asking
Just to let you know you are not the only one withdifferenceproblems with temperatures
- E.I. and JPI always show differences in values.
Thanks for the help
Rick
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387336#387336
Message 2
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Rick:
<Rick>-I'd love to, but who sales the type you are suggesting and where are
you attaching it.
The attachment point should have been provided by the engine manufacture.
<Rick> - What I'm doing is reading the voltmeter to get the temperature off
of the head (ACT) then reading the EFIS.(MGL)
Does the voltmeter have a specific scale for temperature and it is set up
for K type probes?
Also what is ACT?
<Rick> - I have K type probes, if that is what you are asking
Yes, Rick, we understand that since you posted that in the original email.
BUT! They come two ways - Grounded and Un-Grounded. You have to know
which ones to use and that is determined by the manufacture of the readout
head. It should be in the instruction manual for the head... BUT! Again...
Are you using a Voltmeter to read temps AND Does the voltmeter have
a specific scale for temperature and it is set up for K type probes?
These are the basic question that you have to answer and address before you
can do ANY comparison between gauges. If these are not answered you and
your buddy are fishing with out hooks and bait.
Barry
On Thu, Nov 8, 2012 at 8:10 PM, AirEupora <AirEupora@sbcglobal.net> wrote:
> AirEupora@sbcglobal.net>
>
> Heat Seeker 1:
>
> When you say GASKET type probes. =EF=BDAre you=EF=BDreferring=EF
=BDto the RING mount
> thermocouples that go under the spark plug? YES
> And what are you referring to when you say "NEW voltmeter with'K' type
> probe"?Sinometer w/bead wire type k themocouple
>
>
> Your statements bring up ALL SORTS OF ISSUES because:
> 1 - The RING type thermocouples ALWAYS READ HIGHER than cylinder hear
> (DRILLED & MOUNTED) PROBES. =EF=BDThey are picking up the heat=EF
=BDdissipation=EF=BDof
> the spark plug AND they are lowering the heat transfer between the spark
> plug and the cylinder head. =EF=BDNeither case is good. =EF=BDGet r
id of RING type
> thermocouples.
>
> I'd love to, but who sales the type you are suggesting and where are you
> attaching it.
>
> Because of ring type spark plugs will change the operational temp range.
> =EF=BDThey will go UP. Because heat transfer is poor with the ring=EF
=BDcoupler.
> 2 - You use the statement=EF=BD"NEW voltmeter with'K' type probe" - K
type
> probes ARE NOT VOLTAGE items. =EF=BDThey are CURRENT probes. =EF=BD
They produce a
> very small current and if you are using a volt meter to read them your
> numbers will not be correct.
>
> What I'm doing is reading the voltmeter to get the temperature off of the
> head (ACT) then reading the EFIS.(MGL)
>
> 3 - CHT & EGT are=EF=BDREFERENCE=EF=BDtemperatures. =EF=BDUnless
you have a lab type unit
> where=EF=BDdifferences=EF=BDin probes can be zeroed out there will
be=EF=BDdifferences=EF=BDin
> readings. =EF=BDDifferences=EF=BDthat relate to: a> Length of probe
wire. b> How the
> probe was made; twisted, soldered, or welded. c> Calibration of the reado
ut
> head. d> Even the number of twists can change the readings.
> I understand this. I'm asking if anybody has had this much of a problem
> using CHT and the MGL EMS.
>
>
> 4 - There are also=EF=BDdifferences=EF=BDin probes as far as GROUND
ED and
> UN-GROUNDED. =EF=BDYou can NOT mix the two. =EF=BDDo yo know=EF
=BDexactly=EF=BDwhat each prop
> is?
>
> I have K type probes, if that is what you are asking
>
> Just to let you know you are not the only one with=EF=BDdifference=EF
=BDproblems
> with temperatures - =EF=BDE.I. and JPI always show differences in valu
es.=EF=BD
>
>
> Thanks for the help
> Rick
>
>
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