Today's Message Index:
----------------------
1. 03:54 AM - High CHTs HS6A - on one mag (JL2A)
2. 04:17 AM - Re: High CHTs HS6A - on one mag (A. Dennis Savarese)
3. 10:19 AM - Re: Manifold Pressure Gage (doug sapp)
4. 06:43 PM - Re: High CHTs HS6A - on one mag (Roger Kemp)
Message 1
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| Subject: | High CHTs HS6A - on one mag |
IAS 95 knots, 680mm 2000rpm OAT 10C. With both magnetos selected CHT (of No4 Cyl
front cockpit gauge) stabilises a bit over 200C.
This alone is usually hot for an HS6A under these conditions - based on experience
from flying many other CJs
Switch to Mag No2, minimal amount of change in anything, slightly rougher, but
hardly perceptible. Switch to No1 Mag, a definitely rougher but CHT drop, instantly
and rapidly! After very short period (30-40 seconds) the CHT is around 165C.
A value that is in line with what is normally seen under these conditions.
The same trend is shown on the rear cockpit CHT gauge - even though absolute values
are about 20C lower overall.
Witch mags back to both and boom! CHT rises very quickly back up.
So what is happening!?
Is No2 Mag auto advancing to some crazy value? Maybe a broken spring, or advance
stop out of adjustment? Showing my complete lack of knowledge of the inner workings
of the CD5 now...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=454520#454520
Message 2
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| Subject: | Re: High CHTs HS6A - on one mag |
Did you check the mag timing?
Although this may be far fetched, I'm thinking ...... the CHT probe is inst
alled on a rear plug.=C2- When you switch to #1 Mag, that is the left mag
which fires only the front plugs.=C2- You mentioned when you switched to
#1 mag, it was definitely rougher.=C2- Maybe the front spark plug on the
cylinder with the CHT probe (some are on the rear plug on the Huosai engin
e) is fouled or causing the rougher running.=C2- Try swapping the front a
nd rear plugs on the cylinder with the CHT probe.=C2- Then go fly the air
plane and see if the symptom you've described follows the plug change.
Dennis
From: JL2A <info@flyingwarbirds.com.au>
To: yak-list@matronics.com
Sent: Monday, April 4, 2016 6:53 AM
Subject: Yak-List: High CHTs HS6A - on one mag
IAS 95 knots, 680mm 2000rpm OAT 10=C3=82=C2=B0C. With both magnetos selecte
d CHT (of No4 Cyl front cockpit gauge) stabilises a bit over 200=C3=82=C2
=B0C.
This alone is usually hot for an HS6A under these conditions - based on exp
erience from flying many other CJs
Switch to Mag No2, minimal amount of change in anything, slightly rougher,
but hardly perceptible. Switch to No1 Mag, a definitely rougher but CHT dro
p, instantly and rapidly! After very short period (30-40 seconds) the CHT i
s around 165=C3=82=C2=B0C. A value that is in line with what is normally se
en under these conditions.
The same trend is shown on the rear cockpit CHT gauge - even though absolut
e values are about 20=C3=82=C2=B0C lower overall.
Witch mags back to both and boom! CHT rises very quickly back up.
So what is happening!?
Is No2 Mag auto advancing to some crazy value? Maybe a broken spring, or ad
vance stop out of adjustment? Showing my complete lack of knowledge of the
inner workings of the CD5 now...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=454520#454520
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
S -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 3
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| Subject: | Re: Manifold Pressure Gage |
Sam,
I have both new and used MAP gauges in stock, give me a call 509-826-4610.
Doug
On Sun, Apr 3, 2016 at 3:12 PM, Sam Sax <cd001633@mindspring.com> wrote:
>
>
> The MAP Gage in my CJ-6 decided it needed to retire before me...
>
> Does anyone has a serviceable one laying around that they are willing to
> let
> go (sell) ?
>
> If you can help please contact me off list at cd001633@mindspring.com
>
> Or cell 305.215.5599
>
>
> Thank you very much,
>
> Sam Sax
> Miami
>
>
Message 4
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| Subject: | Re: High CHTs HS6A - on one mag |
Check your mag timing.
Doc
Sent from my iPad
> On Apr 4, 2016, at 5:53 AM, JL2A <info@flyingwarbirds.com.au> wrote:
>
>
> IAS 95 knots, 680mm 2000rpm OAT 10C. With both magnetos selected CHT (of No4
Cyl front cockpit gauge) stabilises a bit over 200C.
>
> This alone is usually hot for an HS6A under these conditions - based on experience
from flying many other CJs
>
> Switch to Mag No2, minimal amount of change in anything, slightly rougher, but
hardly perceptible. Switch to No1 Mag, a definitely rougher but CHT drop, instantly
and rapidly! After very short period (30-40 seconds) the CHT is around
165C. A value that is in line with what is normally seen under these conditions.
>
> The same trend is shown on the rear cockpit CHT gauge - even though absolute
values are about 20C lower overall.
>
> Witch mags back to both and boom! CHT rises very quickly back up.
>
> So what is happening!?
>
> Is No2 Mag auto advancing to some crazy value? Maybe a broken spring, or advance
stop out of adjustment? Showing my complete lack of knowledge of the inner
workings of the CD5 now...
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=454520#454520
>
>
>
>
>
>
>
>
>
>
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