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  #1  
Old 12-11-2012, 10:18 AM
crabandy crabandy is offline
 
Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,309
Default G3X Bendix Hall effect RPM

Just wondering if the RPM sensor for the G3X system will work with the single "dual" bendix mag?
Thanks,
Andy
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  #2  
Old 12-11-2012, 11:41 AM
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g3xpert g3xpert is offline
 
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Location: Olathe, KS
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Quote:
Originally Posted by crabandy View Post
Just wondering if the RPM sensor for the G3X system will work with the single "dual" bendix mag?
Thanks,
Andy
Hello Andy,

Garmin offers hall effect RPM sensors for both Slick (494-50005-00) and Bendix (494-50005-01) magnetos. These are both listed in the G3X Installation Manual.

The sensor for the Bendix mag uses a 9/16"-24 thread if that helps to check that this sensor fits your Bendix.

Let us know if you have additional questions.

Thanks,
Steve
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  #3  
Old 12-12-2012, 06:18 PM
crabandy crabandy is offline
 
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Location: Ottawa, Ks
Posts: 2,309
Default Bendix D4LN-2021

I went over the install manual on the sensors, I'm sure the sensor would fit but not sure if it's compatible with my "dual" mag. Pic is top of my "dual" mag, top bleed port is just to the right of the red data tag.


I need to do some more research as to which side is the impulse, or if both are impulse mags. My mag has 4 bleed ports, 1 each in the middle of top and bottom and one in the middle of each side. Which port would I use?

Thanks,
Andy
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  #4  
Old 12-13-2012, 02:12 PM
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g3xpert g3xpert is offline
 
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Post

Quote:
Originally Posted by crabandy View Post
I went over the install manual on the sensors, I'm sure the sensor would fit but not sure if it's compatible with my "dual" mag. Pic is top of my "dual" mag, top bleed port is just to the right of the red data tag.

I need to do some more research as to which side is the impulse, or if both are impulse mags. My mag has 4 bleed ports, 1 each in the middle of top and bottom and one in the middle of each side. Which port would I use?

Thanks,
Andy
Hello Andy,

You nearly "stumped the chumps" on this one, but one of our "wrench turners" here has seen the inside of one of these mags and believes that the top port shown in your picture provides access to the rotating magnets on the main shaft.

We believe that you should be able to install your hall effect sensor in that port.

Thanks,
Steve
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  #5  
Old 12-13-2012, 06:29 PM
Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 1,154
Default Sensor question ?

Is the sensor under discussion the same as the UMA sold by others for Bendix and Slick ??
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  #6  
Old 12-13-2012, 07:35 PM
crabandy crabandy is offline
 
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Location: Ottawa, Ks
Posts: 2,309
Default

Not sure if it's the same as the UMA.

Steve, thanks for the replies. I found an exploded diagram on this website and part 59 under the top breather port was labeled as "Rotating Magnent."

http://www.warmkessel.com/jr/flying/...ix/L-975-1.pdf

Thanks,
Andy
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  #7  
Old 12-14-2012, 09:20 AM
RobFloyd RobFloyd is offline
 
Join Date: Feb 2009
Location: Watkinsville, GA
Posts: 11
Default Impulse Coupling

Hi Andy,

Since the "dual mag" is really two magnetos sharing a common shaft, an impulse coupling installed on that shaft would accelerate the rotation of the shaft and retard the spark for "both" magnetos simultaneously. Hope this is helpful!
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  #8  
Old 12-14-2012, 11:08 AM
crabandy crabandy is offline
 
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Location: Ottawa, Ks
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Default

Think I have it figured out, Thanks for all of the replies.
Thanks,
Andy
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  #9  
Old 12-14-2012, 01:30 PM
Alschief Alschief is offline
 
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Location: Anderson MO
Posts: 440
Default Dual Mag RPM

I had much better luck using a UMA RPM Transducer connected to the
Mechanical Tach output shaft.
We have an O32H2AD engine
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  #10  
Old 12-14-2012, 02:41 PM
crabandy crabandy is offline
 
Join Date: Jan 2010
Location: Ottawa, Ks
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Default

Quote:
Originally Posted by Alschief View Post
I had much better luck using a UMA RPM Transducer connected to the
Mechanical Tach output shaft.
We have an O32H2AD engine
Did you try the Bedix Hall Effect sensor in the top center port of the dual mag? Was it unreliable?
Thanks
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