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  #1  
Old 11-08-2019, 09:22 PM
Tharpo Tharpo is offline
 
Join Date: Dec 2010
Location: Hernando, Ms.
Posts: 38
Default Motor mount question

Looking at an older O-320 that looks like it is gonna take a straight mount.Has anyone used an engine like this on a 4? Is there any reason not to? I'm assuming Vans would would make it if it would work ok.
Thanks
Tom H.
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  #2  
Old 11-08-2019, 11:41 PM
Russ McCutcheon's Avatar
Russ McCutcheon Russ McCutcheon is offline
 
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Location: Vancouver, WA USA
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Quote:
Originally Posted by Tharpo View Post
Looking at an older O-320 that looks like it is gonna take a straight mount.Has anyone used an engine like this on a 4? Is there any reason not to? I'm assuming Vans would would make it if it would work ok.
Thanks
Tom H.
Sounds like a conical mount, just delivered an RV-4 conical engine mount to Vanís yesterday so yes if what youíre asking about is indeed a conical engine it can be used on an RV-4 assuming the rest of the engine conforms.
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  #3  
Old 11-09-2019, 11:03 AM
Tharpo Tharpo is offline
 
Join Date: Dec 2010
Location: Hernando, Ms.
Posts: 38
Default Mount

Thanks Russ
I guess I should have mentioned that there are no letters following the O-320 designation on the data plate. Is that a clue as to its age? I think I was told that, or would that be an indicator of anything that might make me want to pass it up?
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  #4  
Old 11-09-2019, 12:19 PM
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Russ McCutcheon Russ McCutcheon is offline
 
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Quote:
Originally Posted by Tharpo View Post
Thanks Russ
I guess I should have mentioned that there are no letters following the O-320 designation on the data plate. Is that a clue as to its age? I think I was told that, or would that be an indicator of anything that might make me want to pass it up?
I have no idea about that, maybe someone else will answer this one.
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  #5  
Old 11-09-2019, 04:09 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
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Default Lycoming

No letters is one of the very early 0 320 engines. No cylinder hold down plates under the nuts, so not eligible for high compression, 150 hp max. I think adding the plates requires changing all the studs but am not certain about this. In any event you have a real antique engine, somewhere in the 1954-55 range.
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  #6  
Old 11-11-2019, 03:08 PM
Tharpo Tharpo is offline
 
Join Date: Dec 2010
Location: Hernando, Ms.
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Default Mount

Thanks Lycoming
Went to look again this AM. Passed on it. Looking again.
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  #7  
Old Yesterday, 09:13 AM
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daddyman daddyman is online now
 
Join Date: Jan 2014
Location: Fredericksburg, Virginia
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Default Straight mount

Quote:
Originally Posted by Tharpo View Post
Looking at an older O-320 that looks like it is gonna take a straight mount.Has anyone used an engine like this on a 4? Is there any reason not to? I'm assuming Vans would would make it if it would work ok.
Thanks
Tom H.
Tom,
I have an 1996 -4. About 5 years ago I needed to change the mount bushings because they were deteriorated due to age. It was a straight-forward medium sized job.
Mine has an IO-320.

If you are asking about the mounts themselves, they are fine.

I know most folk use conical mounts, but straight mounts are just fine.
Daddyman
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  #8  
Old Yesterday, 09:58 AM
rag rag is offline
 
Join Date: Feb 2012
Location: Holmen, WI
Posts: 36
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I ran a conical mount (also called a straight mount) O320 and Catto prop for many years on my RV4. I replaced the cheap rubber conical mount inserts with Lord conical mount inserts that are "clocked" for engine sag and vibration. I upgraded to a O360 and a dynafocal mount with a Catto prop about 1-1/2 years ago. The dynafocal mount is noticeably smoother. So much better that I would not use a conical mount if I were to build another RV.
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