Received-SPF: none
 receiver=logan.com; client-ip=140.172.240.2; envelope-from=bdube@al.noaa.gov
Message-Id: <6.2.1.2.0.20050613143630.042fd580@mailsrvr.al.noaa.gov>
Date: Mon, 13 Jun 2005 14:51:24 -0600
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Bill Dube <bdube@al.noaa.gov>
Subject: Re: [FlyRotary] Re: More RX-8 Manifold Thoughts
In-Reply-To: <list-1000216@logan.com>
References: <list-1000216@logan.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed


>
>Bill, if you're going to eliminate all the 'stuff' and the port will 
>always be open, why not remove the wall between the side ports and make 
>them one?

         Without any doubt, I know that the stock intake makes 247 HP with 
all the valves wide open. Since I already have a design that I know works, 
I'm planning to make my replacement intake identical to the stock intake, 
but without the valves. Of course, I plan to make the turns a bit tighter 
to move the runners closer to the top of the cases (to clear the top of the 
cowling.)

         The stock intake has a valve that joins the two primary runners at 
~12.5 inches when open, and ~19 inches when closed. Since they went through 
all this trouble, this tells me that it is very important to keep them 
separate, then join them at 12.5 inches, if I want to make 247 HP.

         There are two ports below the secondary ports (the 5th and sixth 
port, I suppose) that are valved off at idle and then are combined with the 
primary ports at the 12.5 inch point. This is one more clue that I should 
keep all the "primary" timed ports separate for 12.5 inches.


Bill Dube'