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  #1  
Old 12-21-2013, 08:21 AM
J.D J.D is offline
 
Join Date: Jun 2013
Location: Salome AZ Prescott AZ
Posts: 20
Default Oil accumulator explosion

IFR southbound climbing through 11K west of reno NV when a loud bang up front gets my immediate attention, when my voice returned I let center know I may have to dive in to reno. As everything sounded ok and all gauges were in the green I proceeded south while trying to figure what caused the loud bang.

To make a long story short the top had blown out of the moroso tank, I had left the valve closed when starting fortunately or all the oil would have been pumped out.

This just happened two days ago when I have more information I'll let everyone know also will post pictures as soon as I figure out how.

J.D
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  #2  
Old 12-21-2013, 12:01 PM
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skylor skylor is offline
 
Join Date: Aug 2009
Location: Southern California
Posts: 1,023
Default Locked Up Oil

Quote:
Originally Posted by J.D View Post

To make a long story short the top had blown out of the moroso tank, I had left the valve closed when starting fortunately or all the oil would have been pumped out.

J.D
If the accumulator was full of cold oil prior to flight without adequate expansion volume (ullage) and the isolation valve remained closed after engine start then during flight as the accumulator warmed to engine compartment temperature, the oil had no place to go as it heated and expanded. This caused over pressurization of the cylinder and the resultant failure. It sounds like this setup needs a pressure relief valve that bypasses the isolation valve.

Skylor
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  #3  
Old 12-21-2013, 01:17 PM
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RONSIM RONSIM is offline
 
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Default Sorry, but

I do not know what a moroso tank is or what an oil accumulator is doing on an RV --

Can someone enlighten me, please?

Thanks,

Ron

Edit: ---- I read the other posts ---- thank you ----- very helpful.
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Last edited by RONSIM : 12-22-2013 at 05:30 AM. Reason: Additional comment
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  #4  
Old 12-21-2013, 01:27 PM
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rocketbob rocketbob is offline
 
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Default

The Canton Accusumps are better, they come with a relief valve for exactly this purpose.

The accumulator is used instead of an inverted system. They're simpler and more reliable if properly set up.
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  #5  
Old 12-21-2013, 01:44 PM
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Mike S Mike S is offline
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Default

http://www.summitracing.com/parts/mor-23903/overview/
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  #6  
Old 12-21-2013, 01:49 PM
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wirejock wirejock is offline
 
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Default accumulator

So how much inverted time can you fly with one? Sounds like the perfect solution for some occasional acro.
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Last edited by wirejock : 12-21-2013 at 02:05 PM.
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  #7  
Old 12-21-2013, 04:30 PM
J.D J.D is offline
 
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Location: Salome AZ Prescott AZ
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Default accumulator tank

Actually I have an inverted oil system also, the accumulator tank just keeps oil pressure up all the time no momentary blurps to cause a dynon alarm. It's also a good way to pre-oil before startup assuming you open the valve.

J.D
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  #8  
Old 12-21-2013, 04:39 PM
J.D J.D is offline
 
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Default

You may be correct with the cold oil theory althought this system has an air chamber on one end which should prevent this.

Thanks
J.D
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  #9  
Old 12-21-2013, 07:45 PM
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ronschreck ronschreck is offline
 
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Default

Quote:
Originally Posted by RONSIM View Post
I do not know what a moroso tank is or what an oil accumulator is doing on an RV --

Can someone enlighten me, please?

Thanks,

Ron
HERE is an old thread which describes the half Raven system and oil acccumulator that I used before going to a full inverted system. I still use the accoumulator to keep pressure up during zero "G" maneuvering when the inverted system check valve ball isn't seated in either the upright or inverted position. I found that the accumulator gave me about seven seconds of oil pressure.
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  #10  
Old 12-22-2013, 07:58 AM
J.D J.D is offline
 
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Location: Salome AZ Prescott AZ
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Default

Ron

Did you ever put a valve on the accumulator tank?

J.D
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