Mailing List flyrotary@lancaironline.net Message #26833
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: counterweights
Date: Tue, 4 Oct 2005 22:10:37 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
To throw a wrench in the works, I was reading about the subject on the RX-7 forum, and one guy claims that has weighed the counter weights and finds that all engines from 86-95 have the same counter weights!!  But I want to believe it because it would be easy.
 
I know that Mazda has different part numbers but I suppose they could still all be the same... 
 
Hi Dave,
 
I believe the term is "wishful thinking" :-)  They have to be different for different weight rotors.  
 
I can probably lay my hands on a front counterweight for an 86-88 and 89-91, and I MIGHT (big might) have a rear counterweight in the attic for an 89-91.  I've been meaning to look, since I've wondered about this several times.  I'll try to check on both of these tomorrow if you don't get a better answer.  
 
And the worst part is that there was a pair of 9.7:1 rotors on e-bay a while back and I flaked and forgot to put in a bit...  they went for $120 for the pair, but new ones are $600 each - ouch! 
 
Ouch is right.  Actually, I've picked up a few 9.7 rotors over the last year, but have also scrapped a couple from Ebay.  Some moron just threw two rotors in a box, with one layer of bubble wrap, then shipped it.  They were beat to hell, and I never got anything out of the guy.  If you keep up with the amount you spend for used rotors you can't actually use, then it might not be that much more expensive to buy new :-( 
 
Rusty
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