REFLECTOR: After two years of prep.

[Douglas Holub]

I tried for weeks to get my IOX-360 to idle below 1000 RPMs without success. 
I even re-calibrated the fuel injection.  I finally discovered that my 
sniffle valve wasn't installed. But it wasn't plugged (thank God). The hole 
for the sniffle valve in the plenum wouldn't let the throttle body restrict 
air intake enough to idle slowly.

I elected not to install the sniffle valve. I just made the hole in the 
plenum smaller by installing a pipe fitting. I can still idle at 750 RPMs, 
and I don't need to worry about the sniffle valve getting stuck and blowing 
up my engine.

Doug Holub

----- Original Message ----- 
From: "David Ullman" <ullman at robustdecisions.com>
To: <reflector at tvbf.org>
Sent: Wednesday, August 03, 2011 9:14 AM
Subject: Re: REFLECTOR: After two years of prep.


> My Velocity will be done on Tuesday.  That is my response to the 
> "question".
> I have been saying it for about five years.
>
> My latest setback came on engine first start last month which resulted in 
> me
> tearing the engine down again (I built it up the first time from a timed 
> out
> engine,  with adult supervision)  I broke it because I didn't have a
> "Sniffle Valve".  No, I didnt make that up!
>
> Its what you don't know that can hurt you and there is a lot I still don't
> know about Lycoming engines and Velocity airplanes.  This is true even
> though I have a PhD in Mechanical Engineering and a Masters in 
> aeronautics.
> My ignorance about airplanes and engines continues to amaze me.
>
> It seems that on fuel injected engines, it is fairly easy to pump too much
> fuel into the injectors.  In fact, if you leave on the electric fuel pump
> and have the mixture not pulled to the fuel shut off position, you can 
> pump
> the entire tank into the engine. The fuel then flows through the open 
> intake
> valves into the intake manifold and even into the throttle body or, if the
> intake valves are open, into the cylinder flushing out any oil in the 
> bottom
> of the cylinder.  I did that and scared two cylinders.  I come to find out
> that in the bottom of the manifold is a pipe plug (at least there was on 
> my
> engine) and this is where the Sniffle Valve goes.  It lets gas drip out, 
> but
> closes as soon as there is manifold pressure below ambient.  No one told 
> me
> this before and many pairs of competent eyes have looked at my work.
>
> I still fail to understand the crudity of the design work on the Lycoming.
> There is no way you can flood a car engine to the point of ruining it.
>
> Anyway, it is all back together and I will start it again this week.  Now 
> I
> wonder if I left off the Fapodoodle or the Quarnitip or Framistanze or 
> ....?
>
>
> David G. Ullman
> ullman at robustdecisions.com
> 541-754-3609
>
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