Received-SPF: pass
 receiver=logan.com; client-ip=205.152.59.67; envelope-from=sqpilot@bellsouth.net
Message-ID: <000701c4e2ba$7338e740$bf2cd6d1@paul52u7f5qyav>
From: "Paul" <sqpilot@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-568027@logan.com>
Subject: Re: [FlyRotary] Re: Short intake manifolds
Date: Wed, 15 Dec 2004 09:26:25 -0600
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit

Hi, Tom....I saved a few posts that addressed the problem you were referring 
to. The folks at Mistral also went into a lot of detail about it. Problem 
is, they were talking about the LONG intake runners, and having the 
injectors at the far end, away from the engine. Power pulses problems, 
incorrect fuel mixtures, etc.
     I am not going to try the short manifold, (since I received one with 
the bolt-on fuel/ignition package that I purchased from Atkins Rotary), and 
see how it works. I understand Dave Atkins has been using his for quite some 
time, with a lot of cross-country trips under his belt.
    Also, hearing Al's comments helps as well.  What the heck....I built an 
experimental, so I guess it's expected I have the need to experiment a 
little. Thanks for the input, Tom.  Paul Conner

----- Original Message ----- 
From: "Tom" <tomtugan@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, December 14, 2004 11:36 PM
Subject: [FlyRotary] Re: Short intake manifolds


> Paul,
> There was a discussion here a few weeks ago regarding 'back pulses' in the
> intake manifold.  Sorry, that may not be the correct term.   IIRC, seems a
> short manifold  may have issues, one being fuel droplets being expelled 
> the
> opposite direction.   Let me suggest the potential for it to pool in your
> 'outer chamber' and another potential for a backfire to ignite it. 
> Hopefully
> that is blatantly wrong so those who know will step in and straighten it 
> out.
> You can tell by my terminology that I don't talk motors much.  Also, seems 
> I
> read many years ago that the one reason aircraft carburetors are hung 
> below the
> motor is so any fuel remnants would fall out and evaporate and not pool,
> lessening chances that a backfire would have something to ignite.  This, 
> just
> idle chat.
>
> Tom
>
>
> --- Paul <sqpilot@bellsouth.net> wrote:
>>  My question is....With the
>> short manifold putting the TWM throttlebody over the top of the exhaust, 
>> has
>> Dave had any problems with fuel dripping out of the throttlebody after
>> engine shutdown?  Also, did he put any kind of heat barrier between the
>> exhaust manifold and the throttlebody?
>
>
>
> __________________________________
> Do you Yahoo!?
> Send holiday email and support a worthy cause. Do good.
> http://celebrity.mail.yahoo.com
>
>>>  Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>