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Old 01-02-2019, 07:59 PM
WingnutWick's Avatar
WingnutWick WingnutWick is offline
Join Date: Jun 2013
Location: Lemoore
Posts: 146
Default I-320 H2AD mixture, idle, EGT


Back again with the never ending learning from all you fine folk. This time on an O-320 H2AD.

1. High EGTís: #3 and #4 run high EGTís. Anywhere below 5K with full rich mixture those two EGTs are in the mid 1400ís. #1 and #2 are normal to low. CHTís look fine on all 4 with no major variation. As opposed to my O-360 where if I lean, I can go pretty far back with an associated rise in RMP as it peaks even at sea level, on this one it almost seems like itís already at peak and I canít get a rise in EGT if I lean at low altitudes. This is the same for on the ground. No rise in RMP at all when leaning. Mixture arm goes full deflection both ways. If I cut off either the mag or EI in flight the EGTís will fly past 1500.

2. Reference above: inability to peak with leaning at low altitudes or on deck. (Ie. seems to be operating near a peak) Though it wonít get rough till about 1/3 of the mixture pulled out. Just no rise.

3. High IDLE. Will idle around 880 +/-20. Throttle goes full deflection and adjusted the idle speed screw to make sure the throttle had full throw and it did. Do I mess with the idle mixture screw? If so how? What else?

This is running on 1 mag and 1 EI. Runs smooth on both. Wooden prop.

Thanks for the help and insight!


Rhino driver by trade
RV-8 O-360
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Old 01-02-2019, 10:39 PM
Greg Dillon Greg Dillon is offline
Join Date: Mar 2005
Location: Upland,California
Posts: 67

Sounds like an intake air leak. Check hoses and gaskets for intake tubes as well as primer lines (if installed) and primer port plugs. With that high of an idle you may have trouble slowing it down to land.
Greg RV9A EFII 0-320-H2AD
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Old 01-03-2019, 08:33 AM
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Toobuilder Toobuilder is offline
Join Date: Jul 2009
Location: Mojave
Posts: 4,276

Agreed. Sounds like the all too common leaking tubes. Pick up the kit from SDS to fix the problem 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
Harmon Rocket II -SDS EFI instalation in work
RV-8 - Flying
1940 Taylorcraft BL-65 -flying
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Old 01-03-2019, 09:38 PM
WingnutWick's Avatar
WingnutWick WingnutWick is offline
Join Date: Jun 2013
Location: Lemoore
Posts: 146
Default Wilco

OK, I'll try the kit!


Rhino driver by trade
RV-8 O-360
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Old 01-11-2019, 06:57 PM
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rjcthree rjcthree is offline
Join Date: Jan 2007
Location: Bay Village, OH
Posts: 777
Default What aircraft, carb and exhaust, please?

A list of the other equipment would help. Thanks.
RV-9A N183RC/90432: tip-up, O320H2, Ellison, Dynon D180
RV-8 83718, wing kit in work with a four year plan
2011-2019 VAF contributor
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