Phil, It has been several years since I rebuilt and owned my Marvel Schebler MA 3 carb, but, I can tell you that the MA3 carb I pulled off my Continental 0-200 was nearly the exact same as the Marvel Schebler carb I pulled off of our Oliver/White tractor. You are right, the tractor carb body was cast out of a heavy metal verses the aircraft MA3 version. I can not remember for sure if the rebuild kit I bought for the tractor version stated MA3 on the package but, I believe it did because thats how I noticed it on the tractor dealer shelf. I can not speak to whats on the Ford tractors but, I can tell you that if you looked at a painted aircraft MA3 and the Oliver White tractor carb, you would swear them to be the same. That is until you held each in your hand and noticed the tremendous weight difference of the heavy cast tractor version. Exactly the same. I believe our tractor was a Oliver 1400/1450 or 1600/1650 ( Oliver eventually became White) series but we had so many Oliver tractors I can not swear which one I recall pulling the carb off of. I do not remember all the parts that came in the rebuild kit and if I bought additional parts such as the float separately but, I bought the tractor rebuild kit to rebuild my 0-200 carb and needles, float, gaskets and everything was an exact fit replacement. I do remember that rebuild kit was only $ 28.00. At the time, I actually went in to get a rebuild kit for the tractor, noticed how similar it was to my 0-200 carb. So, since I was working in an aircraft repair facility at the time, me and the chief mechanic put both carbs side by side and rebuilt them both. I would not suggest anyone use the Marvel Schebler tractor version carb that I am referring to simply because it was so heavy. But, if you need a rebuild kit, I had no problem with mine. I have looked a bit at the Zenith replacements for Marvel Schebler carbs and I think there are some interesting possibilities. It would take more research to determine if and what might work on a VW 2180. So, I would still defer to Steve Bennett of Great Plains aircraft for carb recommendations if you are going to use a VW motor. In my opinion he has more expertise on the subject then most anyone I know, and he fly's behind his product and that's a pretty convincing statement. Jeff York Georgetown Scott County Airport KR2 2010 National Gathering Peoples Choice, Best Interior 2011 AirFest Best Experimental, Best Instrument, Best Interior
________________________________ From: Phillip Hill <phill.h...@gmail.com> To: KRnet <kr...@mylist.net> Sent: Monday, November 26, 2012 10:26 AM Subject: Re: KR> Re: Carbs for VW based engines I don't believe the MA3 is a tractor carb. Marvel-Schebler makes a bunch of carbs for tractors that look similar but what makes it an MA3 is the type of mixture control it has. For instance, there are 4 "styles" of "main jet" controls, in their manuals, they call them "power adjustments". There is a fixed jet, and 3 different types of adjustable jets. Two of them are on the top of the bowl and the other is on the bottom of the bowl. The one on the bottom of the bowl is exactly like the Zenith carb with the "tee" handle adjustment. The other one, used on the tractor models, is a knurled knob on top of the bowl. The last type is only on the MA3, 4, 5 etc and was made only (from all I have researched) for aircraft application. The differences between the MA3(and up) is that the MA series employs a mechanism that turns the short 90deg (less than 180) lever action into linear motion on the needle. So instead of needing to turn the needle 4 to 6 turns to go from full rich to closed, the mechanism in the MA series does it in less than one turn. It's more like a valve. I think you'll be disappointed if you buy a carb for a Ford 8N or 9N and try to put it on your plane and expect to have mixture control like what you are used to in the air. Now, if you don't care to have the aircraft style mixture control, then knock your self out. Get one intended for the Ford 8N or 9N and you're golden. I think another difference is the MA series is Aluminum and the rest are some other ferrous casting...or if you get a really old one, brass. my 2 centavos On Mon, Nov 26, 2012 at 7:40 AM, Larry&Sallie Flesner <fles...@frontier.com>wrote: > > > Has anyone checked out the carb's at (google) "marvel ma3 tractor > carburetor" ? The price sure looks good. I'm running an MA-3A (I > think that is the number) on my 0-200 and haven't touched it since > doing a rebuild and installing it 450+ hours ago. I recall mine > having the metal float and the single piece verturi AD's with now problems. > > Larry Flesner > > > _______________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > _______________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
