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  #1  
Old 05-24-2013, 06:44 AM
dcl dcl is offline
 
Join Date: Mar 2012
Location: UK
Posts: 36
Default O320-A3C ?

I came across a o-320-A3C (narrow) for sale, will it work easily in a 9A ?

Thanks
David
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  #2  
Old 05-24-2013, 09:10 AM
flyboy1963's Avatar
flyboy1963 flyboy1963 is offline
 
Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
Default depends eh!?

I believe this is what I have now, an A3A....converted to straight riser intake sump...making it an A3B.
......do you plan to use a C/s prop? I like that it can run low octane fuel.

sorry about the formatting. go to
http://www.meyette.us/LycomingEngineNumbers.htm
for the original.

Model HP T/O RPM Fuel C.R. DESCRIPTION Suffix
O-320-A1A 150 2700 80 7.00:1 Controllable propeller, 25 degree spark advance Bendix S4LN-20 and S4LN-21 Magnetos -27
O-320-A1B 150 2700 80 7.00:1 Same as -A1A with straight riser in oil sump and -32 carburetor -27
O-320-A2A 150 2700 80 7.00:1 Same as -A1A but fixed pitch propeller -27
O-320-A2B 150 2700 80 7.00:1 Same as -A2A with straight riser in oil sump and -32 carburetor -27
O-320-A2C 150 2700 80 7.00:1 Same as -A2B with Retard Breaker Magnetos -27
O-320-A2D 150 2700 80 7.00:1 Same as -E3D but with conical mounts and 0-320-A sump and intake pipes -27
O-320-A3A 150 2700 80 7.00:1 Same as -A1A but uses 7/16 in. dia. propeller bolts -27
O-320-A3B 150 2700 80 7.00:1 Same as -A3A except for straight riser in oil sump and -32 carburetor -27
O-320-A3C 150 2700 80 7.00:1 Same as -A3B except for Retard Breaker Magnetos
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Perry Y.
RV-9a - SOLD!....
Lake Country, BC
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  #3  
Old 05-25-2013, 07:44 AM
bluebrear bluebrear is offline
 
Join Date: Feb 2013
Location: Bethel
Posts: 32
Post Straight Riser

I was told a straight riser wouldn't work in a 9A because of the mount interference. You have a straight riser sump installed OK?
Gary
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  #4  
Old 05-26-2013, 02:48 PM
dcl dcl is offline
 
Join Date: Mar 2012
Location: UK
Posts: 36
Default Sump

So if I read the chart correctly it will fit a 9A without changing the sump.

It is a plus that it will take a constant speed prop.

At 7:1 I would feed it Mogas !

David
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  #5  
Old 05-26-2013, 06:30 PM
flyboy1963's Avatar
flyboy1963 flyboy1963 is offline
 
Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
Default need some experts to respond

as i understand it the curved riser tubes get in the way of the mount; the straight has them more forward...but don't quote me on the semantics.
Get an engine guy to verify.
also you want to know if the plug is in the (hollow) crank before you hang a C/S prop on it, and can't get oil to it!
ditto the expert required.
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Perry Y.
RV-9a - SOLD!....
Lake Country, BC
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  #6  
Old 05-27-2013, 08:43 AM
bluebrear bluebrear is offline
 
Join Date: Feb 2013
Location: Bethel
Posts: 32
Default B1B Straight Riser

Still not certain if a B1B will fit in the 9A. If the straight riser oil sump is the problem, how difficult and expensive is it to change? Any expert advise out there?
Gary
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  #7  
Old 05-27-2013, 07:44 PM
rvbuilder2002's Avatar
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
Default

Quote:
Originally Posted by bluebrear View Post
Still not certain if a B1B will fit in the 9A. If the straight riser oil sump is the problem, how difficult and expensive is it to change? Any expert advise out there?
Gary
For an "A" model RV, the straight riser sump is the one you need.

I already replied to the other thread you started HERE
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Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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