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Venturi hole size for Irvine .40 conversion?

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Venturi hole size for Irvine .40 conversion?

Old 05-24-2023, 09:33 AM
  #1  
franchi
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Default Venturi hole size for Irvine .40 conversion?

I want to convert an Irvine .40 RC to CL use. What size of hole should I drill for the venturi if I plan on using an OS nva?

How could I use the existing RC carb for CL use?

Tia,

Franchi
Old 06-02-2023, 05:24 PM
  #2  
Ployd
 
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Hi Franchi,
The simple one first, if using the r/c carb just wire the throttle fully open and regulate the fuel flow with the main needle like you would with a regular glow engine,
If the intent is to fit a venturi with a straight through spray bar and needle set up then a venturi hole about 5/16" diameter where the spray bar goes through would be a good starting point.
Ployd in OZ
P.S. there is a venturi chart on the Barton Control line site that would give you a better answer.

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