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Surging
RV-7A with an O-360 and a constant speed prop. Got grief. Was running rich causing engine to "load up" @ full power--cured by leaning. Sent the carb off for a Service Bulletin rebuild on the floats. Now at full power, the engine surges rhythmically. Not cured by leaning. Fuel flow is 17.4 gph @ full power. CHT's/EGT's all normal. Engine runs smooth @ 23/23 or 24/24, just a full power problem.
Any clues? I'm tired of looking for alternate landing spots with every take-off (good exercise, though). Jack 24 hours N811AK |
First questions:
Which prop governor? What ignitions? Happens every single time or does it seem to be more pronounced in certain conditions (hot, cold)? |
Not gonna say for sure it's NOT the engine, but I'd be looking REAL hard at the prop governor. What model is it?
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Easy test and if it is the same on the left, right, and both, it is probably not the ignition. If it changes, you have just found your problem. Good luck. |
Governor
Jack,
If you have the Jihostroj governor - consider that as a potential culprit. Many surge at full power, particularly on cold days. Check the old threads for info on this. Rob |
Surging
Governor is MT with a Hartzell blended airfoil prop. Does this on mag, elec ign, or both.
E-mailed MT today and got a response. They have a problem with the blended airfoil prop and their model B prop governor. They have agreed to a rebuild upgrade to model F. I'll let you know if it works Jack |
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I'll hope the F revision works. If not, the PCU5000X will be the choice. Who makes it? Where is it available? Jack |
MT Gov
I had the same problem and sent the Gov back to MT. Once it was updated to F mod it 's been fine.
If you do a search you'll find quite a few others have had the same problem. Peter |
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http://www.vansairforce.com/communit...d.php?p=207532 |
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