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Date: Tue, 07 Feb 2006 18:34:26 -0700
From: Bill Dube <william.p.dube@noaa.gov>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Why?? Re: [FlyRotary] RX-8
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Here is what I posted to the other list:

 > I bought one of Rupert's RX-8 engines (6-port) on Ebay about 6  months
 > ago. At the time, the US dollar was a bit stronger, so the price  was
 > $1800 USD. Now it is closer to $1900 USD.
 >
 > My engine arrived exactly as pictured. Complete with engine  harness,
 > injectors, fuel rails, intake manifold, throttle body,  alternator, and
 > sensors. Oil cooler lines are present, but bent close to the  engine  
 > for
 > shipping.
 >
 > It arrived nicely padded and strapped on a pallet about 2  months  > 
after I
 > bought it. Shipping was about $300 to Denver. Paperwork fees  were  > 
about
 > $200.
 >
 > I have not run the engine yet, but it seems just fine from what  I can
 > tell by inspection. I put a borescope in the ports. The rotors,  seals,
 > and walls look fine. No scoring or hot spots were apparent.  Seems to
 > have great compression turning by hand. I would take a very  rough  > 
guess
 > at 20,000 miles, judging from the minor carbon on the rotor  faces and
 > exhaust ports.
 >
 > These engines have never been in a car. They were used by Mazda  for  
 > some
 > sort of dyno testing. I suspect emissions testing, but that is  just a
 > wild guess. The clutch and pressure plate on mine had zero wear.
 >
 > I considered this engine from Rupert a super good deal. When I   > 
bought it
 > for such a low price, I knew that I would still be way ahead  even if I
 > had to rebuild it. The fact that it is in such good condition  that I
 > won't likely have to do anything internally was a bonus, from my
 > perspective.
 >
 > Rupert is a good guy to deal with. Very helpful and a square  dealer.
 >
 > Bill Dube'

Ed Anderson wrote:

> That's certainly interesting, Randy,  in that the 6 port and 4 port 
> Rx-8 engine both use identical internal parts.  True the induction 
> system and port openings on the castings is different due to the 
> number of ports - similar to the difference between the  older 13B six 
> port and 4 port turbo engines.
>
> While the 6 port will reportedly produce higher HP, its only when you 
> get up into the 8500+ rpm range that is true.  Then the better high 
> rpm breathing of the 6 port induction system gives it an edge in 
> producing power. However, I know of no one who has exceeded 7500 rpm 
> in aircraft application at this point.  Tracy Crook as probably a 
> couple hundred hours on a  4 port .  I believe his conclusion was that 
> the complexity of the six port intake Vs its potential adaptation for 
> aircraft use made the 4 port preferable.
>
> In any case, hard to understand why one engine would be junk when it 
> shares the same design and parts as the other engine - sure would like 
> to know some particulars about it.
>
> Ed
>
>
> ----- Original Message ----- From: "randy echtinaw" <rjechtinaw@ia4u.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Tuesday, February 07, 2006 7:17 PM
> Subject: [FlyRotary] RX-8
>
>
>> Gentlemen,
>>    I have the opportunity to purchase a 4 port or a 6 port RX-8  
>> engine. I thought I wanted a 4 port because I thought it would be  
>> easier to muffel. I just heard a "rumor" that the 4 port is junk and  
>> go with the 6 port. I need 220-230 hp using the 2.85 PSRU, no turbo.  
>> I would consider P-porting if absolutely necessary to get the HP.  
>> Obviously, I know very little about engines and want to start with  
>> the best I can get so, considering my needs which one do I want?
>> Thank you,
>> Randy
>>
>> -- 
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>>
>
>
>
> -- 
> Homepage:  http://www.flyrotary.com/
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>