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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-974148@logan.com>
Subject: Why?? Re: [FlyRotary] RX-8
Date: Tue, 7 Feb 2006 20:19:10 -0500
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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
>
> --
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