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05-07-2008, 06:16 PM
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Join Date: Aug 2005
Location: Grand Rapids, MI
Posts: 107
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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
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05-07-2008, 07:51 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,152
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First questions:
Which prop governor?
What ignitions?
Happens every single time or does it seem to be more pronounced in certain conditions (hot, cold)?
__________________
Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
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05-07-2008, 08:48 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,120
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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?
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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05-07-2008, 09:29 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by scard
What ignitions?
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Does it do this when running the left, right and/or both ignitions?
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.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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05-07-2008, 11:16 PM
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Join Date: Mar 2007
Location: Warrenton, VA
Posts: 273
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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
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05-08-2008, 11:01 AM
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Join Date: Aug 2005
Location: Grand Rapids, MI
Posts: 107
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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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05-08-2008, 11:28 AM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,152
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Quote:
Originally Posted by dekky111
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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That will probably do the trick. They have problems with the "B" model in general. I had one that surged too. Had the "F" revisions done, it got a little better, then I bought a PCU5000X and have been very happy ever since.
__________________
Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
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05-08-2008, 04:12 PM
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Join Date: Aug 2005
Location: Grand Rapids, MI
Posts: 107
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Quote:
Originally Posted by scard
That will probably do the trick. They have problems with the "B" model in general. I had one that surged too. Had the "F" revisions done, it got a little better, then I bought a PCU5000X and have been very happy ever since.
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Scott,
I'll hope the F revision works. If not, the PCU5000X will be the choice. Who makes it? Where is it available?
Jack |
05-09-2008, 06:51 AM
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Join Date: Oct 2007
Location: Birmingham United Kingdom
Posts: 374
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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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05-09-2008, 07:26 AM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Quote:
Originally Posted by dekky111
Scott,
I'll hope the F revision works. If not, the PCU5000X will be the choice. Who makes it? Where is it available?
Jack
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Check this thread....
http://www.vansairforce.com/communit...d.php?p=207532
__________________
RV-12 Build Helper
RV-7A...Sold #70374
The RV-8...Sold #83261
I'm in, dues paid 2019 This place is worth it!
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