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  #1  
Old 05-04-2018, 04:17 PM
Hornet2008 Hornet2008 is offline
 
Join Date: Jul 2010
Location: NSW Australia
Posts: 260
Default Star wheel adjustment

Hi All,
My IO 320 D1A idles roughly and there is no rise in RPM moving to idle cut off. This, and black smoke on start, indicate it is running too rich idles at 700 RPM once warmed. I've read on carbs engines the mixture adjustment needle is turned out one to one and a half turns in most cases from closed. I have moved the star wheel in the lean direction a number of clicks (10) and still have rough idle and no rise. Do I need to make several turns as opposed to moving it clicks. Anyone able to give me a starting distance between the two blocks where the star wheel is positioned.
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  #2  
Old 05-04-2018, 06:10 PM
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Walt Walt is offline
 
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Nominal setting:
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  #3  
Old 05-05-2018, 02:12 AM
Hornet2008 Hornet2008 is offline
 
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Thanks Walt, much appreciated. Can I ask where Fig 5 is found?
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  #4  
Old 05-23-2018, 01:23 PM
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Silver Hawk Silver Hawk is offline
 
Join Date: Mar 2008
Location: Everett, WA
Posts: 7
Default

Hi Pete, try looking at the 15-338 manual here for idle adjustment and 15-810 for the nominal length for the link to start with:

http://www.precisionairmotive.com/servpubs.htm

If it is rich, you should be getting a big rise, no rise indicates lean.
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  #5  
Old 05-25-2018, 07:28 AM
Rupester Rupester is offline
 
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Location: Mahomet, Illinois
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I had exactly the same problem when I first started mine. I was amazed at how much adjustment it took to get the idle condition properly leaned. I also quickly learned that all taxi and ground ops must be done in full lean condition, otherwise it will foul plugs quite quickly.
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  #6  
Old 05-25-2018, 07:54 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by Rupester View Post
I had exactly the same problem when I first started mine. I was amazed at how much adjustment it took to get the idle condition properly leaned. I also quickly learned that all taxi and ground ops must be done in full lean condition, otherwise it will foul plugs quite quickly.
A properly adj FI system does not need to be leaned on the ground.
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Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #7  
Old 05-25-2018, 11:45 AM
Rupester Rupester is offline
 
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Quote:
Originally Posted by Walt View Post
A properly adj FI system does not need to be leaned on the ground.
So are you saying you wouldn't accept a 40RPM idle increase between normal rich and full lean?
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  #8  
Old 05-25-2018, 12:33 PM
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Walt Walt is offline
 
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Quote:
Originally Posted by Rupester View Post
So are you saying you wouldn't accept a 40RPM idle increase between normal rich and full lean?
If you have less than approx 50 rpm rise you should not be lead fouling plugs on the ground, so further leaning will have almost no effect at that point. If you're loading the plugs up with lead I would suspect you are doing that while flying not on the ground.
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Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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