REFLECTOR: After eight years of prep.

[Alex Balic]

Had a similar story with a different engine- I was using my trusty (not)
Blue Mountain EFIS One to monitor my Subaru engine while I was getting it
tuned- the BMA was showing low coolant temps despite being calibrated twice-
allowed the engine to over heat at 185 deg indicated and cost me a head
gasket/associated teardown/machining and re-build- and I am not one of those
builders with a ton of time on my hands, so that process took me about 4
months start to finish- Got a Skyview in there now...

 

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Peter Braswell
Sent: Wednesday, August 03, 2011 8:47 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: After two years of prep.

 

David,

Thanks so much for sharing your story. I guess misery loves company because
now I don't feel so bad having ruined my canard. 

 

Peter


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On Wed, Aug 3, 2011 at 9:14 AM, David Ullman <ullman at robustdecisions.com>
wrote:

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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