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03-28-2016, 05:00 AM
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Join Date: Jan 2005
Posts: 1,024
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Does your carb have a pepperbox style discharge nozzle, If not that is your problem. What is the carb P/N? That will tell the tale.
Good Luck,
Mahlon
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"The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk."
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03-28-2016, 07:42 AM
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Join Date: Aug 2012
Location: Lufkin Tx
Posts: 689
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Quote:
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Does your carb have a pepperbox style discharge nozzle, If not that is your problem. What is the carb P/N? That will tell the tale.
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Marvel Schebler MA-4SPA model 10-5009
I'm not sure if this has anything to do with my problem, but my co-owner flew it and said that on climb out the #3 EGT alarmed at 1502 the the engine did the stutter and the EGT immediately dropped to 1480 and continued to drop to around 1400. The CHT's were around 350. I will watch the EGT next time and see it repeats.
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Arlie Conner (A&P)
RV-4 (N124TT) Sold
RV-8 (N269CP) Sold
RV-4 (N684ML) completed 3-17-19
KOCH Nacogdoches
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03-28-2016, 07:45 AM
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Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,122
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have you thought of doing an exhaust valve SB check? 
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TURBO YES =VAF= Payed Jan2019
Ed D'Arcy
RV6-A 5,200+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015 
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
addicted pickle ball player
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03-28-2016, 08:30 AM
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Join Date: Aug 2012
Location: Lufkin Tx
Posts: 689
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Cylinders were just overhauled and had valve job done.
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Arlie Conner (A&P)
RV-4 (N124TT) Sold
RV-8 (N269CP) Sold
RV-4 (N684ML) completed 3-17-19
KOCH Nacogdoches
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03-28-2016, 08:48 AM
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Join Date: Sep 2006
Location: Windsor, California
Posts: 920
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After valve/cylinder work, did you check the dry tappet clearances?
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)! 
V AF donation through June 2021.
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03-28-2016, 09:26 AM
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Join Date: Aug 2012
Location: Lufkin Tx
Posts: 689
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David, I'm not sure. I had someone else rebuild my engine when the cylinders were overhauled. Everything internally is new except the piston rods and crank. I even had to buy new accessory gears due to corrosion. I can ask if the tappet clearance was checked. I do know that the lifters are also brand new.
__________________
Arlie Conner (A&P)
RV-4 (N124TT) Sold
RV-8 (N269CP) Sold
RV-4 (N684ML) completed 3-17-19
KOCH Nacogdoches
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03-28-2016, 10:53 AM
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Join Date: Jan 2005
Posts: 1,024
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Have it modified into or exchanged for a 10-5009N or equivalent and your problem will go away.
Good luck,
Mahlon
Quote:
Originally Posted by acam37
Marvel Schebler MA-4SPA model 10-5009
I'm not sure if this has anything to do with my problem, but my co-owner flew it and said that on climb out the #3 EGT alarmed at 1502 the the engine did the stutter and the EGT immediately dropped to 1480 and continued to drop to around 1400. The CHT's were around 350. I will watch the EGT next time and see it repeats.
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__________________
"The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk."
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03-28-2016, 11:21 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,277
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Quote:
Originally Posted by mahlon_r
Have it modified into or exchanged for a 10-5009N or equivalent and your problem will go away.
Good luck,
Mahlon
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You can buy the pepperbox jets for around $150 and they're relatively easy to replace. There is a part # for a good replacement from Marvel, but I don't have it off hand. I wasn't having your specific problem, but did experience atrocious distribution problems and this replacement helped quite a bit.
Larry
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N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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03-28-2016, 12:03 PM
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Join Date: Aug 2012
Location: Lufkin Tx
Posts: 689
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So what I am hearing is that I might be having a fuel/air distribution problem that is causing the intermittent stumble? It makes sense. Does anyone have the part numbers I need to change the jet mentioned above?
__________________
Arlie Conner (A&P)
RV-4 (N124TT) Sold
RV-8 (N269CP) Sold
RV-4 (N684ML) completed 3-17-19
KOCH Nacogdoches
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03-28-2016, 12:55 PM
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Join Date: Dec 2005
Location: Sydney, Australia
Posts: 427
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Check your spark plug resistances - all should be < 5kohms. High resistances can lead to flash overs elsewhere in the ignition system causing the stumble you describe.
__________________
Doug Gray
RV-6 completed, flying since July 2010
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