Ron Lendon - Experimental Aircraft Builder's Log

Ron Lendon's Aircraft Mfg.


Date: 11-27-2009
Number of Hours: 1.00
Manual Reference: MA3SPA
Brief Description: Cleaning up pieces of carb

Ran the main bodies through the gunk tank today and cleaned up some of the parts to see what needs replacing. The MA3PA I got was from an 65 HP Continental. Not sure if it's going to be big enough for the Corvair. So with the knowns these values were created by the following methods. Calulated CFM at this URL: http://www.csgnetwork.com/cfmcalc.html Using 164 CI and 3300 RPM Required Carburetor Size In CFM CFM Required (Rounded) 156.597 100% VE CFM Required (Rounded) 129.976 83% VE And this URL: http://www.csgnetwork.com/airflowcalc.html So how much air will flow through a 31mm venturi and a 43mm throttle plate? 153.07932845086478 CFM So the carb will flow more than the engine requires at 83% VE, I call that a good fit at sea level. The questions are: will this be large enough at 14000 ft? Are these calculations correct? What might I be missing here?

43 mm throttle plate

31 mm venturi

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