Today's Message Index:
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1. 03:51 AM - Re: Re: High CHTs HS6A - on one mag (A. Dennis Savarese)
2. 04:19 PM - Re: High CHTs HS6A - on one mag (JL2A)
3. 05:44 PM - M-14 powered CJ CHT issues (Jay McIntyre)
4. 05:56 PM - CJ generator warning light circuit inop (Jay McIntyre)
Message 1
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| Subject: | Re: High CHTs HS6A - on one mag |
I agree with you 100% Walt.
Dennis
From: Walter Lannon <wlannon@shaw.ca>
To: yak-list@matronics.com
Sent: Wednesday, April 6, 2016 12:51 AM
Subject: Re: Yak-List: Re: High CHTs HS6A - on one mag
The numbers you have given for the ignition angle are not correct.
They are also corrupted by what appears to be a computer glitch.=C2- I am
referring to the "A(with an accent above) and the C with degree mark.=C2-
I
note the A is also repeated in "they are 24 deg. mags." but not the C.
If the "C" is not an error I would interpret that to mean the angles you
have given are relative to the crankshaft.=C2- If that is the case they a
re so
far out I doubt the engine would run.=C2- If that is an error and you are
referring to the propellor shaft angle they are still far out of tolerance.
Please advise.
Rather than give you the numbers from memory I will confirm at the hangar
tomorrow and get back to you.
Walt
-----Original Message-----
From: JL2A
Sent: Tuesday, April 05, 2016 7:29 PM
Subject: Yak-List: Re: High CHTs HS6A - on one mag
checked timing, left mag was 2.5=C3=82=C2=B0C BTDC the RH 3.5=C3=82=C2=B0C
BTDC! They are 24=C3=82=C2=B0
mags.
Yikes
I think you have probably pointed the finger at the most likely explanation
of the CHT drop.
Cheers
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=454594#454594
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
S -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 2
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| Subject: | Re: High CHTs HS6A - on one mag |
They are degrees propeller angle! miles out I know, I have recommended the owner
get his normal shop to reset the timing also find Tdc properly as I only used
quick n nasty method - but repeated 4 times as I thought it was I that was surely
wrong! Even with a +-2 degree margin of error finding tdc they are still
out. Also noticed both mags were against their adjustment stops advanced - ie
could not advance any more without re doing the coupling adjust. Suspect someone
thought it was near enough or best they could do when timing was last checked.
Or I can't find tdc for nuts
Still the fact remains this engine running about 20C hotter than any installation
I have flown behind. We put a independent thermocouple in one of the cooling
fins of number four cylinder and found the cockpit gauge reads around 15C
more, but then this would probably be found if you put a thermocouple on any other
engine two (a result of having the thermocouple under the spark plug as eluded
to earlier)
Cheers all!
PS is there any way of checking dynamic timing of these engines with strobes
etc?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=454644#454644
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| Subject: | M-14 powered CJ CHT issues |
Hi all.
New Zealand recently got her first CJ conversion to M-14 power and she goes
like a dream apparently.
The guys have been flying through our summer with barel acceptable CHT's
(too low) but are concerned that as our relatively temperate winter comes
on the CHT's will drop too low.
No cowl gills are fitted and they are wondering what is the best way to get
the temps up to normal levels?
A Whirlwind prop with spinner is installed.
Any suggestions out there would be greatly appreciated.
Regards, Jay
New Zealand
Message 4
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| Subject: | CJ generator warning light circuit inop |
Hi all,
On another CJ we have a problem where the generator warning lights do not
work (neither the front or rear cockpit). Bulbs are both fine but neither
light comes on when the generator goes off line... i.e. no lights when
engine is not running either.
We can see the generator going off and on-line via the ammeter.
We have tried to check the circuit but cannot find anything of note.
We tried another known voltage regulator in case there was an internal
fault, but with no change.
Any thoughts here would be greatly appreciated
Regards, Jay
New Zealand
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