Mailing List flyrotary@lancaironline.net Message #44985
From: Bill Eslick <wgeslick@gmail.com>
Subject: Re: [FlyRotary] Looking for a rear counterweight
Date: Thu, 29 Jan 2009 19:56:24 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Thanks for the info.  I have the correct rear weight now in hand, and will use the matching front weight.  I am putting the '91 higher compression rotors back into my '88 engine.  Porting will have to wait til next time.  The engine I bought turned out (much to the seller's suprise) NOT to be ported.  Live and learn.

Bill Eslick

On Tue, Jan 27, 2009 at 3:21 AM, cbeazley <cbeazley@innovista.net> wrote:
Hi Bill;
By the book, you want the front and rear counterweights to match the generation of the rotors ->
86-88 = Series4 (S4),
89-92= S5,
93-95= S6,  S5 and S6 are supposedly the same.

rear CW - a few quick searches will turn up more - going rate ~$50-60.  Dealer probably 2.5 times that.
http://www.rx7club.com/showthread.php?p=8911374

front CW:
The S4 and S5 front CW are different although they look very similar.
Cary

PS - more than a few engines have been assembled without being told this - and they ran just fine.  Although, best to try to match.
You should have nothing else to worry about your assembly.  Are you going to give it a good street port?

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