REFLECTOR: Hot Starts

[Bob Jackson]

Craig,

We use Full Rich mixture when throttle 'pumping' a hot start.  The engine
still needs fuel to start, and it's the rare case where we feel like we've
flooded it.  550's may be different, but even in a hot start situation it
seems to be more due to too little, rather than too much fuel, if it won't
start.  Even for a normal Hot Start, we still do a 'half prime' with the
Boost Pump before turning the engine and that usually does it.  We only
resort to 'pumping' if this doesn't work.  

Bob

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Craig and Denise Woolston
Sent: Wednesday, February 11, 2009 7:56 AM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Hot Starts

Bob-

  What mixture setting do use when you "pump" the throttle?  When hot
starting our 550, we typically put 1/4 throttle, mixture cut off then as we
crank we feed the mixture in "very" slowly.

  We too have tried the high boost, mixture cutoff, run for 60secs and alls
that seems to do is flood the engine.  So then we have to crack for a long
time with throttle full, mixture cutoff.

  Just like Scott said, if you get the first hand dance correct it will
start fine, screw it up and then you are "that poor bastard out there
flogging the starter to death"...

Craig


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Bob Jackson
Sent: Tuesday, February 10, 2009 3:18 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Hot Starts

The hot start technique we use for our custom turbocharged IO-550N may not
be of the 'best form' but it works every time -- we 'pump' the throttle like
you would on a car, with a lot more time spent toward full open (than would
normally feel comfortable on the ground) -- and it always starts quickly.
You just must be ready to pull the throttle back to idle quickly.

They say you can run the Boost Pump on High for 30-60 seconds to recirculate
and cool the fuel and induction plumbing, but on our engine that just pumps
fuel overboard (via the cylinder intake drains) and doesn't seem to make it
much easier to start.

Bob Jackson
Custom Turbo IO-550N
N2XF


_______________________________________________
To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
No virus found in this incoming message.
Checked by AVG - www.avg.com 
Version: 8.0.233 / Virus Database: 270.10.17/1933 - Release Date: 02/03/09
17:48:00