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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?
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