Today's Message Index:
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1. 04:24 AM - Re: Re: LycomingEngines-List Digest: 0 Msgs - 11/04/17 (FLYaDIVE)
2. 06:00 AM - Re: Engine temps (Kelly McMullen)
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| Subject: | Re: RE: LycomingEngines-List Digest: 0 Msgs - 11/04/17 |
Ray:
What contradictions? I was not contradicting anything till now.
Did you read! The second sentence reads: "Now, to keep things
simple,...". What is your point? We all know that there is a variance in
temperature reading due to probe, probe placement and between gauge
manufactures. We are NOT talking about differences between planes and
equipment.
You MUST be a Gauge Watcher with your head down all the time. Very few
training aircraft have EGT/CHT or Fuel Flow. Leaning was taught by FEEL!
THEN! If you have a engine monitoring system you cross check against
that. NOT the other way around.
And - How do you know - "but once you know how your engine feels" if you
don't feel things like vibration? Engines were flown decades before engine
monitoring equipment was installed. As I said: I feel the vibration in my
feet first. I feel it there before it gets to the stick or the gauges.
AND, since many planes are going the way of glass panels, you are loosing
the instrument vibration as a monitoring point, also many panels are
vibration dampened so it takes more vibration before it shows up.
Barry
"If you wash your hands before going to the bathroom you may have
the making of a Crew Chief."
On Sun, Nov 5, 2017 at 2:21 PM, Ray Eaker <rayeaker@gmail.com> wrote:
> Lots of contradictions there, Barry.
>
> EGT temps are relative. The value itself (eg 1400) is mostly meaningless
> but can be meaningful for troubleshooting a problem. The value relative t
o
> PEAK is what matters (and it matters) for lean operations. The feel of yo
ur
> feet, not so much, but once you know how your engine feels using the engi
ne
> monitor values, it might help.
>
>
> On Nov 5, 2017, at 2:06 PM, FLYaDIVE <flyadive@gmail.com> wrote:
>
> Hi Paul,
>
> If you have FUEL INJECTION, you have an IO-360, not an O-360.
>
> Now, to keep things simple, don=99t even look at the EGT. Use your
ears and
> the vibrations you feel. My feet are closest to the engine so I feel
> things through my toes. Lean till the engine runs rough and then give a
> slight twist to rich. THEN! If you want to cross check against EGT go
> ahead. There are no max limits to EGT, NONE in any manuals, but my
> personal limit is 1400 F.
> Now, cross check your CHT. There are limits there. LYCOMING says max of
> 450 F. I use 400 F as my max. REMEMBER! Temperature gauges are a LAGIN
G
> instrument. By the time you SEE your temp, it is beyond that point.
>
> Barry
>
> On Sunday, November 5, 2017, Paul Collins <collins04@cableone.net> wrote:
>
>> To the =9CEngine-Smart=9D and experienced group,
>>
>> I have an 0-360 - fuel injection, magneto and Lightspeed
>> electronic ignition, all four cylinders monitored by EGT and CHT,
>> compression boosted to 10.2 by Ly-Con.
>>
>> So, how would this experienced group set the fuel-flow?
>> What limits/measurements would you use??
>>
>> 1. Run by EGT? If so, what limits??
>> 2. Run by CHT? If so, what limits??
>> 3. Run by fuel flow vs % power setting? If so, what limits??
>> 4. Run by congressional budget? If so, what limits??
>>
>>
>>
>> Weather is changing out here is Idaho, so it is a good time to start
>> thinking about these things =93 and shovel snow.
>>
>>
>>
>> Thanks for your consideration,
>>
>> Paul Collins
>>
>> N8ZV
>>
>>
>>
>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
>> Windows 10
>>
>>
>>
>> *From: *LycomingEngines-List Digest Server
>> *Sent: *Sunday, November 5, 2017 1:13 AM
>> *To: *LycomingEngines-List Digest List
>> *Subject: *LycomingEngines-List Digest: 0 Msgs - 11/04/17
>>
>>
>>
>> *
>>
>>
>>
>> ========================
>>
>> Online Versions of Today's List Digest Archive
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>>
>> Today's complete LycomingEngines-List Digest can also be found in either
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d
>>
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>>
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>> Total Messages Posted Sat 11/04/17: 0
>>
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>
> --
> Barry
> "Chop'd Liver"
> If you wash your hands before you go to the bathroom you may have the
> makings of a Crew Chief.
>
Message 2
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| Subject: | Re: Engine temps |
You argue for engine mixture adjustment by feel. Sorry, engine feel will
not get you close to where you want to be on an engine with well
balanced injection. Yes, it works for carbureted engines and injected
engines with poor mixture distribution, which just tells you you are in
the ball park in a very crude way. You do not know whether you are in a
danger zone or not.
The engine will be smooth until just before it quits. On the rich side,
50 ROP feels exactly like it does at 200 or 300 ROP.
One does NOT need heads down. With fuel flow you can simply pull the
mixture to a flow known to be lean of peak for a given power, and then
fine tune a twist or two at a time. A glance at EGT once in a while is
all that is needed.
Once level in cruise it might take a couple minutes to get mixture
exactly where you want it, after that a glance once in awhile will tell
you it is holding where desired.
Yes, I would advise a safety pilot for the first few flights of finding
the boundaries of mixture you want to use, but that is to simply learn
what your engine wants and what numbers will get you there in the future.
On 11/6/2017 5:22 AM, FLYaDIVE wrote:
> Ray:
>
> What contradictions? I was not contradictinganything till now.
> Did you read! The second sentence reads: "Now, to keep things
> simple,...". What is your point? We all know that there is a
> variancein temperature reading due to probe, probe placement and
> between gauge manufactures. We are NOT talking about differences
> between planes and equipment.
>
> You MUST be a Gauge Watcher with your head down all the time. Very few
> training aircraft have EGT/CHT or Fuel Flow. Leaning was taught by
> FEEL! THEN! If you have a engine monitoringsystem you cross check
> against that. NOT the other way around.
>
> And - How do you know - "but once you know how your engine feels" if you
> don't feel things like vibration? Engines were flown decades before
> engine monitoring equipment was installed. As I said: I feel the
> vibration in my feet first. I feel it there before it gets to the stick
> or the gauges. AND, since many planes are going the way of glass
> panels, you are loosing the instrumentvibration as a monitoring point,
> also many panels are vibration dampenedso it takes more vibration
> before it shows up.
>
> Barry
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