Today's Message Index:
----------------------
1. 06:42 AM - Re: Overheating cylinder (Valovich, Paul)
2. 01:43 PM - Re: RV-List Digest: 9 Msgs - 09/13/11 (Ian Brown)
3. 03:50 PM - Re: Re: Overheating cylinder (Mike Robertson)
4. 03:57 PM - Re: Overheating cylinder (Ed Holyoke)
Message 1
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| Subject: | Re: Overheating cylinder |
I had the same thing happen to me on 2 cylinders on 2 separate occasions du
ring early phase 1 (new Aerosport IO-360). First time it was an obvious wir
ing issue - bad crimp that would intermittently make proper contact. The se
cond time was also a wiring issue - but took a lot longer to discover. At f
irst glance everything appeared ok - but more careful inspection revealed a
loose wire.
In my case the temp variations were so rapid and extreme that I concluded t
he problem had to be electrical - not actual overheating. Sure got my atten
tion, though.
Message 2
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| Subject: | RE: RV-List Digest: 9 Msgs - 09/13/11 |
Greg,
Two suggestions:
1. The mass of the cylinder head is unable to give temps that fluctuate
wildly unless you mean changing over several minutes. Short term
fluctuations are going to be due to the sensor and it's associated wiring.
Since you're measuring very small voltages, you're susceptible to any
induced volts where the sensor lead passes through the firewall, and maybe
close to other wiring. Suppliers often suggest routing the sensor wires
through a different port in the firewall.
2. Does anything else change upon landing, like lower alternator output,
lower current draw on other devices, lights turned off, or whatever? I'd
expect only lower readings because of lost volts. Was "out of range"
downwards? A bad crimp or bad pin retention is likely to be the villain if
you're only seeing readings fluctuate downwards. I've had a couple of cases
where a pin or contact looked good but pushed out when the connector was
mated.
Ian Brown,
Bromont, QC
Thanks. Interesting that it cools down and becomes normal moments after
> landing. But not on a long descent. Airflow thru cowl affecting poor
> crimp connection. Will recrimp wires and clean injectors this weelend.
>
> Greg
Message 3
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| Subject: | Re: Overheating cylinder |
It is possible. It happened to me=2C and after many injector cleanings and
hunting we found it to be a bad flow divider. Not likely=2C but a possibil
ity. Electrical is more likely.
Mike Robertson
Subject: RE: RV-List: Re: Overheating cylinder
From: mr.gsun@gmail.com
Good thought=2C thanks. I will soak them in some Hoppe's #9. Would a
cylinder with a dirty injector really run that much hotter?
Greg
On Sep 13=2C 2011 10:58 AM=2C "Mike Robertson" <mrobert569@hotmail.com> wro
te:
>
> If everything there is OK try checking the injectors. Sometimes something
will get into the fuel injectors that causes the spray pattern to go bad.
>
> Mike Robertson
>
>
>
>
>
> Date: Tue=2C 13 Sep 2011 08:37:34 -0700
> Subject: Re: RV-List: Re: Overheating cylinder
> From: rv10rob@gmail.com
> To: rv-list@matronics.com
>
> Try re-crimping the connectors before swapping the sensors.
>
>
> On Tue=2C Sep 13=2C 2011 at 8:02 AM=2C <mr.gsun@gmail.com> wrote:
>
>
> On a recent crosscountry flight at 8k and 2350 rpm=2C my IO360 started a
wild fluxuation on #2 cht. My Skyview showed rapid movement between 300 and
550 degrees then it went out of range and stayed that way until landing. W
hile taxiing all temps were normal and #2 egt stayed normal throughout the
flight. When I pulled the cowl nothing looked cooked and sensor wire looked
normal. Compression seemed normal when I pulled the prop through eight or
ten times. I will swap egt sensors 2&4 next flight. Any other suggestions?
> Greg
> On Sep 12=2C 2011 5:33 AM=2C "Linn Walters" <pitts_pilot@bellsouth.net> w
rote:
>>
>> Email Les Staples at SkyTek. Les Staples <les@skytecair.com>
>> He's more than willing to help. Tell him I sent ya.
>> Linn Walters
>>
>>
>> On 9/11/2011 8:40 PM=2C Brian Huffaker wrote:
>>>
>>>
>>> Got the exhaust system attached. It went together very easy=2C oneof th
e
>>> simplest parts of this project so far. Everything just fit (once I file
d
>>> the gaskets a little bit). Definatly recommend the Vetterman exaust if
>>> anybody is wondering.
>>>
>>> Looking ahead to later steps=2C I'm going to need a flywheel and starte
r
>>> ring gear. Reading around=2C lycomings have either the 122 or 149 tooth
>>> gear=2C is there a way I can look at the starter I have and know which
gear
>>> would fit? I can find lots of pages like this:
>>>
>>> http://www.skytecair.com/RingGearTech.htm
>>>
>>> explaining how to tell from the gear which it is=2C but nothing going t
he
>>> other way. It is a O-360A1D=2C so probably 149=2C but how can I know? O
r
>>> should I just get one=2C then get a new starter to match? That page tal
ks
>>> about the first 3 digits of the starter model number=2C which is Delco-
Remy
>>> 1109519. Searching by that I find:
>>>
>>> http://www.texasairsalvage.com/main_view.php?editid1 144
>>>
>>> Which says it is for a 122 tooth gear. Anybody know how to tell?
>>>
>>> Brian Huffaker=2C DSWL (bifft@xmission.com)
>>> RV-8A 80091 Hooking up engine.
>>> 1/4 Starduster II N23UT flying
>>>
>>>
> ="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/
Navigator?RV-List
> ://forums.matronics.com">http://forums.matronics.com
> min.
>
>>
>>
>>
>
>
> t="_blank">http://www.matronics.com/Navigator?RV-List
> ttp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
>
>
> --
>
> Rob Kochman
> RV-10 Flying since March 2011
> Woodinville=2C WA
> http://kochman.net/N819K
>
>
>
>
Message 4
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| Subject: | Re: Overheating cylinder |
After I overhauled our engine, I had a cylinder reading 800+ degrees on
my first flight. It was running way too well to be almost melted so I
decided to ignore it, but also landed on my next circuit just to check
it out. It turned out to be a loose connection at the probe.
Pax,
Ed Holyoke
On 9/14/2011 6:38 AM, Valovich, Paul wrote:
>
> I had the same thing happen to me on 2 cylinders on 2 separate
> occasions during early phase 1 (new Aerosport IO-360). First time it
> was an obvious wiring issue -- bad crimp that would intermittently
> make proper contact. The second time was also a wiring issue -- but
> took a lot longer to discover. At first glance everything appeared ok
> -- but more careful inspection revealed a loose wire.
>
> In my case the temp variations were so rapid and extreme that I
> concluded the problem had to be electrical -- not actual overheating.
> Sure got my attention, though.
>
> *
>
>
> *
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