Return-Path: Sender: (Marvin Kaye) To: flyrotary@lancaironline.net Date: Sun, 23 Nov 2003 11:50:31 -0500 Message-ID: X-Original-Return-Path: Received: from fed1mtao04.cox.net ([68.6.19.241] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2762984 for flyrotary@lancaironline.net; Sun, 23 Nov 2003 09:24:35 -0500 Received: from smtp.west.cox.net ([172.18.180.57]) by fed1mtao04.cox.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with SMTP id <20031123142434.MWUU3905.fed1mtao04.cox.net@smtp.west.cox.net> for ; Sun, 23 Nov 2003 09:24:34 -0500 From: Dale Rogers X-Original-To: "Rotary motors in aircraft" Subject: Yet more on "Need Help ..." X-Original-Date: Sun, 23 Nov 2003 9:24:26 -0500 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=____1069597466572_'eCWw1nnr5" X-Original-Message-Id: <20031123142434.MWUU3905.fed1mtao04.cox.net@smtp.west.cox.net> This is a multi-part message in MIME format. ------=____1069597466572_'eCWw1nnr5 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi All, Thank you so much for the information so far. Mercy, I'm going to have to write up a check list before my next visit to a wrecking yard. Rusty wrote: > >I would probably skip the pre-86. The 87 is fine, as is the > >89. The 89-91 had lighter rotors, and higher compression, though it > >won't matter that much. The bigger question would be whether either > >of these was a turbo engine. It would also be nice to know why the > >cars were in the yard. For example, a totaled rear end of the car > >would probably indicate that the engine was OK at the time. A good > >body would probably mean the engine was toast. Either way, you'd > >want to rebuild it, but it will likely be cheaper if the engine was > >good when it was scrapped. I should have taken the time to have a closer look at the rest of each car. In all three cases, the front ends had no particular damage (other than possible "parking-lot rash"), and I forgot to look for whether or not any had an auto trans. I may have to pay more in the end, but I think I may let this one pass by. There may be another of us in the Phoenix area - the '91 already had the engine sold when I got there. But he'd already told me that he'd want "a lot more" money for it than the '87. I'm going up to Prescott next week, and there are a lot of wrecking yards along the way. So I'll check up there too. Ken Welter wrote: > I disagree skipping the pre-86 as they are good engines. > They have 3mm apex seals and the o rings are in the aluminum rotor > housing so you don't have the problem of the ring groove rusting and > braking away, also the side and center housings are interchangeable > with the 12A which are a dime a dozen in the case you need one > someday. > There are two types of pre-86 13B's, a 4 port with carb and a 6 port > with injection and the porting is better in the 12A center housing > than in the 6 port so it would be an advantage to pull a switch if > you had a 12A center housing. Well, that's a whole lot more stuff to consider. I'm aware that 3mm seals are supposed to better; and machining the newer rotors for a larger seal would add to the cost (even if only time, if that turns out to be within the capabilities of my equipment.) Realistically, if I'm running 50/50 coolant, how likely is it that the o-ring groove will rust out? Or are you talking about what someone else may have already done to the engine? One of the reasons I asked for "an '86 or later" was that they'd all have FI. I don't want to run carburation. I know, I'm going to have to get, or make, a different intake manifold anyway, but I'd rather adapt the stock throttle body than have to buy a whole new one. Cost is definitely a factor at this point. The $350 price was a major attraction. But that might still be too high, if all it turns out to be is a rebuildable (?) core. Thank you for the help so far, and please keep asking those questions. I obviously need to know more questions to ask, myself. With warm regard, Dale R. ------=____1069597466572_'eCWw1nnr5 Content-Type: text/html; name="reply" Content-Disposition: inline; filename="reply" [FlyRotary] Re: Need quick help - found 3 different 13
 but I just found a place that has three RX-7s - a
pre-'86, an '87 and a post-'89.  I can get the 87 engine (complete with ECU,
he says) for $350 USD.  I didn't ask a price for the newer unit.

    Is there anything in particular that would make the post-'89 more useful
than the '87? 

Dale R.
 
I would probably skip the pre-86.  The 87 is fine, as is the 89.  The 89-91 had lighter rotors, and higher compression, though it won't matter that much.  The bigger question would be whether either of these was a turbo engine.  It would also be nice to know why the cars were in the yard.  For example, a totaled rear end of the car would probably indicate that the engine was OK at the time.  A good body would probably mean the engine was toast.  Either way, you'd want to rebuild it, but it will likely be cheaper if the engine was good when it was scrapped. 
 
Give us more info, and we can help you make a better decision.  Good luck.
Rusty
 

  I disagree skipping the pre-86 as they are good engines.
 They have 3mm apex seals and the o rings are in the aluminum rotor housing so you don't have the problem of the ring groove rusting and braking away, also the side and center housings are interchangeable with the 12A which are a dime a dozen in the case you need one someday.
 There are two types of pre-86 13B's, a 4 port with carb and a 6 port with injection and the porting is better in the 12A center housing than in the 6 port so it would be an advantage to pull a switch if you had a 12A center housing.

 Ken
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