Jump to content

Why avoid Counterweighted Lycomings?


Recommended Posts

In the Cozy IV plans, chapter 23, page one, the 'Engine Selection' section talks about the recommended Lycoming engines. I am curious why there is advice against models with the '6th and 8th order counterweights'. Is there a problem with these engines that make them unsuitable for the Cozy?



LongEZ #159

Finishing & Engine install

Blogged at: http://www.briansplane.com

Link to comment
Share on other sites

Here's what the Lycomoing rep at Oshkosh told me:


The 6th and 8th order counterweights are included on some constant speed prop applications to minimized the harmonic interactions between the prop and the engine. These counterweights must be tuned, i.e. installed very correctly. Else, they can get out of whack a bit and exacerbate the problem.


Otherwise, they simply add weight.


I have an IO-360 with the 6th and 8th order counterweights. I asked if I should remove them altogether. The Lyc rep said no, leave them in there.

Wayne Hicks

Cozy IV Plans #678


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information