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Rear Prop Gov. Questions

 
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Hopperdhh(at)aol.com
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PostPosted: Fri Jul 28, 2006 9:21 am    Post subject: Rear Prop Gov. Questions Reply with quote

 
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
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PostPosted: Sat Jul 29, 2006 5:43 am    Post subject: Rear Prop Gov. Questions Reply with quote

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
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PostPosted: Sat Jul 29, 2006 8:40 am    Post subject: Rear Prop Gov. Questions Reply with quote

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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