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#1637102
I have an O-200 with a -3SPA which is old and worn looking. Acquired a -3PA for a Lycoming in much better condition. Apart from the mixture control arm the two appear identical.

There’s only one exploded view on the web the -3 in all guises so what does the team think?
#1637368
I believe the 3 refers to the throat size. The P denotes accelerator pump. The A refers to the automatic mixture control. The S is a variation on flange boring size when fitted to engines such as the 290 D , Franklin and Continentals bigger than the A65. I've had both types on my Continental. The guts were identical. Performance ditto.

https://www.econologie.com/fichiers/par ... DlSUOe.pdf

http://www.bowersflybaby.com/tech/fenton.html
User avatar
By Flying_john
FLYER Club Member  FLYER Club Member
#1637719
The analysis of the type number is true - but under the model types there are still 9 or 10 different types of each model. Jetting is one part, I believe things like float bowl capacity, accelerator pump volume and a few other things too.
#1637974
The carburettor part number (ie 10-xxxx) is the important part of a carburettor's identity - not just the model number (ie MA-xxxx).

According to the Marvel-Schebler eligibility chart:

https://msacarbs.com/technical-data/eng ... ility.html

The carburettor for an O-200-A is the 10-4894-1 (this superseded the 10-4894):

https://msacarbs.com/10-4894-2.html

No doubt your LAA Inspector will advise accordingly.