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Rear Prop Gov. Questions

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Hopperdhh(at)aol.com
Guest

Posted: Fri Jul 28, 2006 9:21 am Post subject: Rear Prop Gov. Questions

�

 I searched the archives, but couldn't find answers to these  questions.

 �

 I am�thinking of putting an IO-360-A1A engine in my RV-7A.� It  has been flying with an IO-360-A1D6 which has a front mounted governor.

 �

 Could someone on the list please tell me approximately what the thickness  of the rear mounted prop governor adapter pad is on an IO-360-A1A?� I have  an old one that measures about 2 1/16 inches.� Is there a thinner one  available?� The dimension I need is from the accessory case to the prop  governor itself.

 �

 Also, will the McCauley governor off the left front of my IO-360-A1D6 work  on the rear of the -A1A?� As far as I can tell there is about 3 percent  difference in the drive ratio -- 0.866 vs 0.895.� I would assume that the  governor could be adjusted for this difference.� Is there some other reason  why it won't work?

 �

 Thanks,

 Dan Hopper

 RV-7A

 �

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glcasey(at)adelphia.net
Guest

Posted: Sat Jul 29, 2006 5:43 am Post subject: Rear Prop Gov. Questions

I'm afraid I can't answer the questions you ask, but can add that  

there is a "gotcha" on the rear governor.  Between the governor and  

the engine there is a thin steel plate that is very important.   

Sometimes, because it is stuck to the gasket on each side, it gets  

unknowingly discarded.  The gasket will probably seal without the  

plate, but possibly - and this has happened many times - the gasket  

will sooner or later blow out with the resulting total oil loss.  I'm  

not sure if this plate is only in the "D" dual mag engine or in all  

the rear-mounted governors.  Another important thing is to make sure  

that the steel line (make sure it is steel, not aluminum) to the  

front of the engine is supported in the proper locations.  There is  

an old AD note that covers this.



Gary Casey

 	  Quote: 	
		  

 I am thinking of putting an IO-360-A1A engine in my RV-7A.  It  has  

 been

 flying with an IO-360-A1D6 which has a front mounted governor.



 Could someone on the list please tell me approximately what the  

 thickness  of

 the rear mounted prop governor adapter pad is on an IO-360-A1A?  I  

 have  an

 old one that measures about 2 1/16 inches.  Is there a thinner one   

 available?



 The dimension I need is from the accessory case to the prop   

 governor itself.



 Also, will the McCauley governor off the left front of my IO-360- 

 A1D6 work

 on the rear of the -A1A?  As far as I can tell there is about 3  

 percent

 difference in the drive ratio -- 0.866 vs 0.895.  I would assume  

 that the  governor



 could be adjusted for this difference.  Is there some other reason   

 why it

 won't work?



 Thanks,

 Dan Hopper

 RV-7A

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Hopperdhh(at)aol.com
Guest

Posted: Sat Jul 29, 2006 8:40 am Post subject: Rear Prop Gov. Questions

Gary,

 �

 Thanks for the information.� I have printed it out and will make sure  I have the plate if I should have it.

 �

 do not archive

 �

 Thanks, 

 Dan Hopper

 RV-7A

 �

 �

 In a message dated 7/29/2006 9:44:36 A.M. Eastern Daylight Time,  glcasey(at)adelphia.net writes:

  	  Quote: 	
		  -->    Engines-List message posted by: Gary Casey    <glcasey(at)adelphia.net>



I'm afraid I can't answer the questions    you ask, but can add that� 

there is a "gotcha" on the rear    governor.� Between the governor and� 

the engine there is a thin    steel plate that is very important.�� 

Sometimes, because it is    stuck to the gasket on each side, it gets� 

unknowingly    discarded.� The gasket will probably seal without the� 

plate,    but possibly - and this has happened many times - the gasket� 

will    sooner or later blow out with the resulting total oil loss.� I'm�    

not sure if this plate is only in the "D" dual mag engine or in all�    

the rear-mounted governors.� Another important thing is to make    sure� 

that the steel line (make sure it is steel, not aluminum) to    the� 

front of the engine is supported in the proper locations.�    There is� 

an old AD note that covers this.



Gary    Casey

 	  Quote: 	
		  

 I am thinking of putting an IO-360-A1A engine in my    RV-7A.� It� has� 

 been

 flying with an    IO-360-A1D6 which has a front mounted governor.



 Could someone    on the list please tell me approximately what the� 

    thickness� of

 the rear mounted prop governor adapter pad is on an    IO-360-A1A?� I� 

 have� an

 old one that measures    about 2 1/16 inches.� Is there a thinner one�� 

    available?



 The dimension I need is from the accessory case to    the prop�� 

 governor itself.



 Also, will the    McCauley governor off the left front of my IO-360- 

 A1D6 work

    on the rear of the -A1A?� As far as I can tell there is about 3�    

 percent

 difference in the drive ratio -- 0.866 vs    0.895.� I would assume� 

 that the�    governor



 could be adjusted for this difference.� Is there    some other reason�� 

 why it

 won't    work?



 Thanks,

 Dan Hopper

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 �

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