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  #21  
Old 10-09-2018, 06:43 PM
AirHound AirHound is offline
 
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I weighed all 4 of the floats with an electronic postal scale so the weights could be off some. The external appearance of the new floats appears identical to the Bing floats, but the material is different, a hard epoxy exterior. Perhaps the weight will not double in less than a year like one of the Bing floats did. To me it was worth a try considering Marvel Schebler is a known manufacturer of aviation carburetors.
Marvel Schebler must know the ROTAX standards. Maybe they too have production weight issues.
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  #22  
Old 10-09-2018, 07:49 PM
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Originally Posted by mdoyle View Post
I weighed all 4 of the floats with an electronic postal scale so the weights could be off some. The external appearance of the new floats appears identical to the Bing floats, but the material is different, a hard epoxy exterior. Perhaps the weight will not double in less than a year like one of the Bing floats did. To me it was worth a try considering Marvel Schebler is a known manufacturer of aviation carburetors.
I ran across an alternate way of checking the floats some time back. It was from a British Rotax distributor who had gotten authorization from Rotax for the procedure. Simply put, if the pin in the float is not below the surface of the fuel in the bowl the float is OK.

Regardless of the weight, how do the Marvel Schebler floats do with that test?
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  #23  
Old 10-09-2018, 09:21 PM
mdoyle mdoyle is offline
 
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I have not looked at the new floats in gasoline, but on one of the old floats, the pin was definitely below the surface of the fuel in the float bowl, when it was removed from the carburetor.
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  #24  
Old 10-10-2018, 10:54 AM
AirHound AirHound is offline
 
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Originally Posted by tomkk View Post
I ran across an alternate way of checking the floats some time back. It was from a British Rotax distributor who had gotten authorization from Rotax for the procedure. Simply put, if the pin in the float is not below the surface of the fuel in the bowl the float is OK.

Regardless of the weight, how do the Marvel Schebler floats do with that test?
Spoke with MS...the SB doesn't address weighing other than OEM floats. That's to say MS has been using this material for years in other designs and there has been no significant weight gain with their other like products.
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  #25  
Old 10-10-2018, 11:07 AM
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Spoke with MS...the SB doesn't address weighing other than OEM floats. That's to say MS has been using this material for years in other designs and there has been no significant weight gain with their other like products.
Agreed but the purpose of checking the pin position, and the weight, is to figure out whether the floats are floating at an appropriate level inside the bowl. Just wondering whether that's been checked with the new MS floats.
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  #26  
Old 10-10-2018, 01:21 PM
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Piper J3 Piper J3 is offline
 
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Agreed but the purpose of checking the pin position, and the weight, is to figure out whether the floats are floating at an appropriate level inside the bowl. Just wondering whether that's been checked with the new MS floats.
MS makes lots of floats for carbureted engines running Avgas. I'm wondering how they will hold up to 93E10 Mogas? Also, Trump is tossing the farms in Iowa a bone and changing national fuel standards to E15 year-around. We'll see how Rotax likes extra alcohol. If nothing else, more alcohol -> less power. I guess we need to ask Rotax a few questions before the big day...
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  #27  
Old 10-10-2018, 02:44 PM
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Originally Posted by Piper J3 View Post
MS makes lots of floats for carbureted engines running Avgas. I'm wondering how they will hold up to 93E10 Mogas? Also, Trump is tossing the farms in Iowa a bone and changing national fuel standards to E15 year-around. We'll see how Rotax likes extra alcohol. If nothing else, more alcohol -> less power. I guess we need to ask Rotax a few questions before the big day...
I seem to remember reading somewhere that a lot of the Rotax testing was done in Brazil where they have something like E25 and the engines had no problem. No first hand knowledge of the tho ...
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