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  #1  
Old 10-12-2017, 10:13 AM
447BB 447BB is offline
 
Join Date: Sep 2017
Location: Savannah, GA
Posts: 5
Default WTB Lycoming O-320

Looking for a mid-time O-320 or O-360 engine for an RV7. Want 160-180 hp. Will likely run a fixed pitch prop, or use the IVO in-flight adjustable unit that was installed with the original Subaru powered setup.
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  #2  
Old 10-12-2017, 10:27 AM
Timberwolf Timberwolf is offline
 
Join Date: Nov 2016
Location: Navarre, FL
Posts: 119
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Might check into the ivo. Last I knew this was not recommended due to the power pulses. As in it will shed a blade and could kill you. Also, does the Subaru turn the opposite direction?
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  #3  
Old 10-12-2017, 11:02 AM
447BB 447BB is offline
 
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Do you have a reference for problems with the IVO?
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  #4  
Old 10-12-2017, 11:42 AM
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deej deej is offline
 
Join Date: Jan 2005
Location: Brunswick, ME
Posts: 272
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IVO has stated not to use their props on a direct drive Lyc type engine. I verified this with them a few years ago as I wanted to do the same thing, use my IVO Magnum on a 150 hp Lyc O-320.

I would recommend that you contact them directly to verify: http://ivoprop.com/
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  #5  
Old 10-12-2017, 01:18 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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It is also tribal knowledge within the home building community, to those that have been involved for quite a while.

IVO attempted to introduce and market his prop design for use on lycoming engines ~25 years ago or so. There were a lot of failures and some design changes made in an attempt to make it work but they never did.
A 4 cyl Lycoming has far to strong of power pulse cycling for the prop to endure.

They work fine on smaller displacement engines or engines that have PSRU's that act to damp the power pulses of the engine.
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  #6  
Old Today, 01:21 PM
447BB 447BB is offline
 
Join Date: Sep 2017
Location: Savannah, GA
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Default confirmed IVO not recommended

Spoke with Ron at IVO Propellers. He confirmed that they no longer want their props installed on Lycoming engines. There apparently are some flying, but the installation is not recommended.

So now I am very interested in suggestions, particularly regarding the merits of Catto and Whirlwind with O-320 at 160+ hp.
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  #7  
Old Today, 01:42 PM
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deej deej is offline
 
Join Date: Jan 2005
Location: Brunswick, ME
Posts: 272
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I've been keeping my eye on this company:

http://www.axsport.co.za/

About $6k USD for an electric variable pitch prop for a Lyc, but they haven't released it yet.

Another option is http://www.gt-propellers.com/ for about $10k.
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