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  #11  
Old 05-12-2019, 11:54 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
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Quote:
Originally Posted by Nova RV View Post
For a quick check of just the spider, you can disconnect the line at the injector (leave injectors installed) and put a shot glass under each disconnected line.

Carl
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  #12  
Old 05-12-2019, 12:57 PM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
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Originally Posted by bsvantho View Post
Makes sense - will try that per the AFP manual.

Just out of curiosity did you see any issue while at cruise power?
Above 6~7 GPH, flow division is function of nozzle restrictor size. At that point the piston in the flow divider is raised enough to uncover high volume ports, allowing fuel to bypass the metering slots. Those slots control division at low flow rates. As noted, the slot feeding #4 probably has some trash in it. So lean cylinder when at 3 GPH (slot blocked), normal at 19 GPH (blocked slot bypassed).

Photos and illustrations pages 16 and 17 here:

https://www.danhorton.net/Articles/B...yond%20(1).pdf
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  #13  
Old 05-12-2019, 05:40 PM
bsvantho bsvantho is offline
 
Join Date: Oct 2012
Location: Rochester Hills, MI
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Originally Posted by DanH View Post
Above 6~7 GPH, flow division is function of nozzle restrictor size. At that point the piston in the flow divider is raised enough to uncover high volume ports, allowing fuel to bypass the metering slots. Those slots control division at low flow rates. As noted, the slot feeding #4 probably has some trash in it. So lean cylinder when at 3 GPH (slot blocked), normal at 19 GPH (blocked slot bypassed).

Photos and illustrations pages 16 and 17 here:

https://www.danhorton.net/Articles/B...yond%20(1).pdf
Did the shot glass test and sure enough almost nothing from No. 4 direct from the flow divider. The slot was restricted with a nearly invisible piece of debris. I am now intimitately familiar with the mechanics and geometry of the flow divider. It was a good learning experience. Did a run up, all is well after the cleaning.
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