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Old 02-24-2019, 10:27 PM
rvdave rvdave is offline
Join Date: Jun 2005
Posts: 403
Default Hot weather ground operations

From Michigan but currently flying in Florida and noticing after landing in hot temps and especially after hot starts and taxiing Iím getting rough running that I havenít noticed before since Iíve only been flying for a short while. Seems to me to be hot fuel since after airborne and normal airflow problem seems to go away. Is this common for hot weather ops and fuel injection?
Dave Ford
Cadillac, Mi
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Old 02-24-2019, 10:39 PM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 4,072

Pretty common with Bendix FI. Usually seen shortly after landing and more so after starting with a heat soak. Symptoms increase with the ambient temps in the summer wx. Seems some configurations fair better than others though.

RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress

Last edited by lr172 : 02-24-2019 at 10:42 PM.
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Old 02-25-2019, 05:43 AM
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Auburntsts Auburntsts is offline
Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,717

I have the AFP FI system (FM 200) and haven't noticed the issue you are describing.
Todd ďI drink and know thingsĒ Stovall
RV-10 N728TT - Flying!
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Old 02-25-2019, 08:23 AM
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Phil Phil is offline
Join Date: Nov 2006
Location: Waco, Texas
Posts: 1,643

Pretty common here in Texas. The taxi-in is noticeable after a few minutes on the ground. After it’s shut down and heat soaked, it’s even worse.

The AFP fuel bypass valve helps with the restarts and makes the stumble less noticeable. But on seriously hot days, it doesn’t always fix the stumble as there’s just too much heat for the small amount of fuel needed to idle.

Until a high volume of fuel runs through those lines and cools them down, the stumble persists during hot ground ops. Once the rpms come up and the fuel starts flowing in a higher volume, there’s enough thermal mass in the fuel to make the engine operate smoothly.

... then, of course, once you’re flying you’ve got the added cooling of the air on the lines.

What you describe is something we see here pretty frequently in our local -10 fleet.

Last edited by Phil : 02-25-2019 at 08:25 AM.
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Old 02-25-2019, 12:09 PM
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jeffkersey jeffkersey is offline
Join Date: Sep 2015
Location: Cottontown, TN
Posts: 212
Default Yes...

I whave see similar symptoms on my injected I0-360 when really hot...
Jeff Kersey
RV7A Purchased Flying
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Old 02-25-2019, 12:11 PM
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bruceh bruceh is offline
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,209

I've given up trying to idle my IO-320 at less than 1000 rpm when heat soaked.

It idles fine at lower RPM's when the engine isn't heated up.
Bruce Hill
RV-9A N5771H flown over 600 hours!
APRS Tracking for KJ6YRP and New Flying Blog
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Old 02-26-2019, 11:46 AM
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dmaib dmaib is offline
Join Date: Jan 2006
Location: New Smyrna Beach, FL
Posts: 1,338

Very common on all the -10s I've flown here in FL. I almost always open my oil door after shutting down on a fuel stop or a lunch break to try and let some of that heat escape.
David Maib
RV-10 N380DM
New Smyrna Beach, FL
VAF Paid 1/02/2019

"In '69 I was 21, and I called the road my own"
Jackson Browne

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Old 02-26-2019, 01:34 PM
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snopercod snopercod is offline
Join Date: Aug 2016
Location: Asheville, NC
Posts: 1,800

Have you tried leaning?
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Old 02-27-2019, 03:52 AM
rvdave rvdave is offline
Join Date: Jun 2005
Posts: 403

It does seem to help a little with leaning but not to the point where it will run smoothly. I do have the purge valve and am experimenting with that to push cool fuel before taxi.
Dave Ford
Cadillac, Mi
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Old 02-27-2019, 08:20 AM
painless painless is offline
Join Date: Jan 2005
Location: Peshtigo, Wisconsin
Posts: 748

Hot weather ops?? Whatís that? (As I get ready to fire up the snowblower..... again!)
Jeff Orear
RV6A N782P
Peshtigo, WI
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