Joined: 10 Jan 2006
Location: Sun Lakes AZ
|Posted: Sun Nov 05, 2017 12:39 pm Post subject: LycomingEngines
In the experimental world, the engine easily could have originally been
an O-360, and the data plate would not be changed by installing fuel
injection. Only matters at how well the mixture can be balanced.
Vibration and EGT are only loosely related, and vibration is much less
accurate than EGT. If you are choosing a limit of 1400 EGT, you are
unlikely to ever get to Peak EGT. Without knowing peak, you cannot know
where optimal fuel flow for a given mode of operation exists.
Normally aspirated engines, the peak will depend on how close the probe
is to the exhaust port, what the OAT is, etc. At 1400 you are usually
about 100 ROP. Max EGT will depend on engine timing, valve timing,
health of the spark plugs as well as OAT and engine compression. I used
to fly behind an IO-360-A1A with 8.7 compression. I know fly behind an
IO-540-D4B5 with 8.5 compression, both with 25 degree BTDC timing. EGT
probes are exactly same distance from flange, but the IO-540 peaks at
about 50 degrees hotter than the IO-360 did. Good EGT probes are fast
acting and will show change in a few seconds.
The main point is you do not want to operate above 65% with the EGT
around 50 rich of the first cylinder to peak. That is actually pretty
smooth running on engine with good mixture distribution. 100 ROP is
notably safer and only slightly smoother.
On 11/5/2017 12:06 PM, FLYaDIVE wrote:
| Hi Paul,
If you have FUEL INJECTION, you have an IO-360, not an O-360.
Now, to keep things simple, don’t 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
LAGING instrument. By the time you SEE your temp, it is beyond that point.
On Sunday, November 5, 2017, Paul Collins <collins04(at)cableone.net
To the “Engine-Smart” 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 – and shovel snow.
Thanks for your consideration,
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