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  #1  
Old 12-04-2014, 08:30 AM
Saville's Avatar
Saville Saville is offline
 
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Location: KBVY Massachusetts
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Default O320-E2A converted to C/S = Problems?

Hi all!

I'm looking at an RV-4 (to buy) which sports an O-320 E2A. The owner says the engine was converted, by a previous owner, to a Constant Speed prop engine by, he believes, replacing the crank with a "hollow crank".

Also the 7:1 compression ratio was boosted to 8.5 via higher compression pistons.

Does anyone know of serious problems that occur when one converts an E2A in this way?

thanks!
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  #2  
Old 12-04-2014, 09:55 AM
mahlon_r mahlon_r is offline
 
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Default

O-320-E2A at 160HP and those pistons is really an O-320-D2A. The regular O-320-E2A crankshaft and front bearing setup is constant speed capable. So all he really did was add a prop gov drive, CS prop mounting dowels and CS prop plumbing to a O-320-D2A. Which is not going to present any problem as far as the engine or its operation is concerned.
Merry Christmas,
Mahlon
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  #3  
Old 12-04-2014, 10:01 AM
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Saville Saville is offline
 
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Default

Quote:
Originally Posted by mahlon_r View Post
O-320-E2A at 160HP and those pistons is really an O-320-D2A. The regular O-320-E2A crankshaft and front bearing setup is constant speed capable. So all he really did was add a prop gov drive, CS prop mounting dowels and CS prop plumbing to a O-320-D2A. Which is not going to present any problem as far as the engine or its operation is concerned.
Merry Christmas,
Mahlon
Is it correct to say then, that an E2A is the same as a D2a except the pistons?

Thank you Mahlon and Merry Christmas to you.
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  #4  
Old 12-04-2014, 10:18 AM
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Low Pass Low Pass is offline
 
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Default

I flew a converted -E2A with a Hartzell CS prop for 13-14 yrs with zero problems. Had higher compression (160-hp) pistons and pins too.
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  #5  
Old 12-04-2014, 02:28 PM
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Saville Saville is offline
 
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Default

Quote:
Originally Posted by mahlon_r View Post
The regular O-320-E2A crankshaft and front bearing setup is constant speed capable.
Mahlon
So how does one figure out which O-320's are hollow cranked and have the bearing setup for C/S and which cannot be converted?

thanks
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  #6  
Old 12-04-2014, 02:40 PM
jrs14855 jrs14855 is offline
 
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Location: Lake Havasu City AZ
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Default Engines

320E2D, E3G, E2H, E3D and E3H were originally configured for 0 235 front main bearing. E2H and E3H are not listed for any production aircraft.
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  #7  
Old 12-04-2014, 03:52 PM
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Saville Saville is offline
 
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Quote:
Originally Posted by jrs14855 View Post
320E2D, E3G, E2H, E3D and E3H were originally configured for 0 235 front main bearing. E2H and E3H are not listed for any production aircraft.

Is there a document somwhere that lists all the Lycoming engines and the bearings they have and the cranks they have?

thanks
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  #8  
Old 12-04-2014, 06:10 PM
jrs14855 jrs14855 is offline
 
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Default Bearings

I cross referenced the parts book for the 0 235 bearings. This is only and E series issue and only the ones I listed have the 0 235 bearings. It is easy to pick out in the parts book because the 0 235 nose bearing is four piece vs two piece on all others.
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  #9  
Old 12-04-2014, 06:20 PM
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Saville Saville is offline
 
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Quote:
Originally Posted by jrs14855 View Post
I cross referenced the parts book for the 0 235 bearings. This is only and E series issue and only the ones I listed have the 0 235 bearings. It is easy to pick out in the parts book because the 0 235 nose bearing is four piece vs two piece on all others.
Is this parts book readily available? Can you supply a name and/or ID number? I'd really like to get a reference for things like this.

thanks!
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  #10  
Old 12-04-2014, 06:34 PM
jrs14855 jrs14855 is offline
 
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Default parts manual

They are available from Lycoming or Lycoming dealer/distributor. Very pricey.
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