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06-28-2019, 08:42 AM
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Join Date: Jun 2013
Location: Lemoore
Posts: 187
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Quote:
Originally Posted by DanH
Look at the EFIS photo above. As you further close the throttle plate, does the EGT reduce in step, then fall off a cliff? If so, it's an induction leak...#2 is way lean of peak and eventually goes too lean to fire.
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So I tried pulling the prop through as suggested above and I?ve got equal (and normal) compression on all cylinders. Looking at all the pics I snapped yesterday coming in with higher throttle settings engine runs smooth with #EGT higher than the rest by almost 200. As I pull the throttle (or mixture) it does ?fall off a cliff? like Dan mentioned. It does seem like an induction issue does it not?
Will pull the cowling off today and see what I can see around the intake. I?ll keep you all posted! Yesterday was a bad day for the RVs (my gf?s 6s EI started acting up which is why I switched to the 8 for the commute)
Thanks for the ideas folks!
__________________
-Wingnut
Rhino driver by trade
RV-8 O-360
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06-28-2019, 08:43 AM
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Join Date: Jun 2013
Location: Lemoore
Posts: 187
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Quote:
Originally Posted by Toobuilder
Stuck valve or broken ring lands. Pull the prop through by hand and I'll bet one cylinder is soft.
Do you have the jumpers in the Pmags?
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No jumpers but I adjusted them via the software to be appropriate for 0-360 based off threads from here.
__________________
-Wingnut
Rhino driver by trade
RV-8 O-360
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06-28-2019, 10:50 AM
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Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
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Start with the simple items
Check the plugs and ht wires.
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Building finally
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06-28-2019, 10:56 AM
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Join Date: Jun 2013
Location: Lemoore
Posts: 187
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Quote:
Originally Posted by E. D. Eliot
Check the plugs and ht wires.
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Plugs are pretty new. Less than 20 hrs on them. Wires good.
__________________
-Wingnut
Rhino driver by trade
RV-8 O-360
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06-28-2019, 11:04 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,298
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Quote:
Originally Posted by WingnutWick
So I tried pulling the prop through as suggested above and I?ve got equal (and normal) compression on all cylinders. Looking at all the pics I snapped yesterday coming in with higher throttle settings engine runs smooth with #EGT higher than the rest by almost 200. As I pull the throttle (or mixture) it does ?fall off a cliff? like Dan mentioned. It does seem like an induction issue does it not?
Will pull the cowling off today and see what I can see around the intake. I?ll keep you all posted! Yesterday was a bad day for the RVs (my gf?s 6s EI started acting up which is why I switched to the 8 for the commute)
Thanks for the ideas folks!
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With the addition of these symptoms, I would put an induction leak at the top of my list of culprits.
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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06-28-2019, 11:05 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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If the prop pulls stiff on all 4 cylinders then the condition cleared itself or there is a significant induction leak. Boot, or more likely a dried out gasket. If it's the gasket then you might want to take a look at the SDS "no leak" induction kit and fix it once and for all.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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06-29-2019, 01:44 AM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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+1 for SDS "No induction Leak" mod. My carbureted O-360 idles smooooothly at 450 RPM after installing the mod.
No affiliation, just a happy customer..... 
__________________
Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
ATP, CFII, A&P
2020 Donation+, Gladly Sent
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06-29-2019, 11:33 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Old trick
Here?s an old trick. With the engine un-cowled, and running at a setting where it?s rough, mist or spray alcohol at each induction tube joint, one at a time. If the engine smooths out, you?ve found a leaking joint.
*****Use all normal cautions working around a turning prop******
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06-30-2019, 11:39 PM
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Join Date: Jun 2013
Location: Lemoore
Posts: 187
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That?ll do it!
So took the cowling off and sure enough there was the intake flange sitting at the bottom of the manifold. Not sure how this happened but the two bolts managed to work their way out completely! Gasket nowhere to be found. New gasket and bolts and she?s back to running like her good ol? self! Very odd though, needless to say I checked the rest of the intake bolts.
Thanks for the help all!
Cheers
__________________
-Wingnut
Rhino driver by trade
RV-8 O-360
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07-01-2019, 09:17 AM
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Join Date: Nov 2016
Location: Camas, WA
Posts: 370
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Great news and easy fix! Love this forum to read these situations to learn a little something every day and know where to start looking if/when something does need attention.
__________________
Dan Reed
Camas, WA
RV-7A - Slider in progress - N167DR (reserved)
Sitting in the paint booth, then final assembly/inspection time
2018 and 2019 VAF dues paid
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