two piece venturi

M

messr72

New member
Has anyone changed back to the two piece venturi from the one piece on the 0235 MA3 marvel schebler carb. My plane runs rough especially at cruise and my A&P says that he feels that the single venturi may be the cause. Thanks Mark
 
Sounds like you have other problems. The one piece venturi should make no difference in performance. If the problem came from the change in venturis, I would suspect that it was not installed properly or something else was altered as a result of the change out.

Drew
 
I had a similar problem with my carb on my O-200. I sent mine to Mike's Aircraft Fuel Metering Services in Tulsa. When I got it back there was a significant improvement. This was after the one piece venturi was installed by another shop.
 
It could be your float. See these Servicer bulletins. am not sure if this applies to you but it is worth the read. Go to the link for the full text. Rough running engine is one of the symptoms.



http://www.lycoming.textron.com/support/publications/service-bulletins/pdfs/SB582A.pdf

DATE: October 10, 2008 Service Bulletin No. 582A
(Supersedes Service Bulletin No. 582)
Engineering Aspects are
FAA Approved
SUBJECT: Reprint of Precision Airmotive MANDATORY Service Bulletin No. MSA-13
MODELS AFFECTED: All Lycoming engines equipped with any Marvel-Schebler, Facet, Precision, or Volare carburetor model.
TIME OF COMPLIANCE: Within the next 30 days from the receipt of this Service Bulletin and at 30 day intervals until either the brass or advanced polymer float has been replaced with new foam float Precision P/N 30-860, 30-862 or 30-864.
Precision Airmotive MANDATORY Service Bulletin No. MSA-13 is reprinted in its entirety as follows. Lycoming requires compliance with all elements of this Service Bulletin and with the additional notes listed below.
This reprint is current at the time Lycoming Service Bulletin No. 582A is issued. However, when complying with this Service Bulletin, insure that compliance is in accordance with the latest revision of Precision Airmotive MANDATORY Service Bulletin No. MSA-13.
NOTE
For affected carburetors shipped from Lycoming as spares or as engine components, contact Volare Carburetors. Contact information for Volare is:
Volare Carburetors LLC
P.O. Box 44
211 Chase Street
Gibsonville, NC 27249
Phone: (336) 449-5054

Here is another one ,
http://www.lycoming.textron.com/support/publications/service-bulletins/pdfs/SB366B.pdf
 
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