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  #11  
Old 09-22-2018, 10:19 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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Refresh my memory. What are the symptoms of heavy floats? Is there an overflow of the carb bowls onto the drip pans?
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  #12  
Old 09-22-2018, 10:38 PM
DHeal DHeal is online now
 
Join Date: Sep 2006
Location: Windsor, California
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In my experience: Slight smell of fuel in the cockpit during climb, drip or two of fuel from carb vent tube onto pan, and perhaps a slightly rough idle.
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 700+ hours (as of Nov 2018)!
VAF donation through June 2019.
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  #13  
Old 09-23-2018, 09:17 PM
RFSchaller RFSchaller is offline
 
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Dave, thanks.

Rich
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  #14  
Old 09-23-2018, 09:48 PM
Dave12 Dave12 is offline
 
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Location: Elkton, Md.
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Quote:
Originally Posted by DHeal View Post
In my experience: Slight smell of fuel in the cockpit during climb, drip or two of fuel from carb vent tube onto pan, and perhaps a slightly rough idle.
You can take this to the bank.
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  #15  
Old 09-25-2018, 07:58 PM
AirHound AirHound is offline
 
Join Date: Oct 2006
Location: OFallon IL now, everywhere before
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Quote:
Originally Posted by n233va View Post
Has anyone bought these floats? If so, what was the weight of a new pair. Tragically, I am actually thinking of buying two pairs and paying the outrageous shipping charges. I have been through at least 8 floats so far.
What causes heavy floats? Type gas or inferior material? Ethanol is pretty caustic with plastic such as fuel filters. Are there any original OEM floats in the fleet since day one?
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Last edited by AirHound : 10-02-2018 at 05:06 AM.
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  #16  
Old 09-25-2018, 10:30 PM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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I think it's a materials defect. The SI listed a range of serial numbers newer than mine. We've got 415 hours over 7 years on these carbs and the floats still weigh just over 6g per pair, knock on wood. I'm glad that we've been so lucky.
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[i][size="1"]Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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  #17  
Old 10-08-2018, 01:48 PM
mdoyle mdoyle is offline
 
Join Date: Jun 2005
Location: Xenia, OH
Posts: 130
Default Marvel Schebler MS80-430–FS Float Conversion Kit

I purchased and installed a pair of the Marvel Schebler floats. Weight out of the box was: 3.7 and 3.8 grams. They replaced a pair of Rotax floats that weighed 8.4 and 4.7 grams on removal. Needless to say I had a severe leak out of the overflow tube on my right carburetor.
Works great now.
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RV-12
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Xenia, OH 45385
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  #18  
Old 10-08-2018, 03:07 PM
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Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Quote:
Originally Posted by mdoyle View Post
I purchased and installed a pair of the Marvel Schebler floats. Weight out of the box was: 3.7 and 3.8 grams. They replaced a pair of Rotax floats that weighed 8.4 and 4.7 grams on removal. Needless to say I had a severe leak out of the overflow tube on my right carburetor.
Works great now.
Rotax Service Bulletin says a pair of floats should weigh less than 7.0g. Your new MS floats weigh 7.5g. Just say'n...
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Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 406

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
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  #19  
Old 10-08-2018, 06:42 PM
DHeal DHeal is online now
 
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Location: Windsor, California
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FYI -- data points (all weights are new / dry / fresh out of the box):

-- Old-Style ROTAX #861-184 floats = 2.8 grams each
-- New-Style ROTAX #861-188 floats = 3.2 grams each
-- MS 80-430 floats = Reported @ 3.7-3.8 grams each

ROTAX says max 3.5 grams each (7.0 grams per pair). I'm not sure if this ROTAX weight limit applies to another manufacturer's (i.e., non-Bing) replacement float. Maybe the MS has "superior floatation" characteristics? Any hydrodynamicists out there??
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 700+ hours (as of Nov 2018)!
VAF donation through June 2019.
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  #20  
Old 10-08-2018, 09:41 PM
mdoyle mdoyle is offline
 
Join Date: Jun 2005
Location: Xenia, OH
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Default Float weights

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.
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