REFLECTOR: Primer Works

[Laurence Coen]

Hiroo,

Glad to hear that your starting problem is solved.  As to your reported 
numbers the IAS isn't very meaningful without the pressure altitude and OAT 
to correct to TAS.  Your RPM and MAP numbers would indicate a very high 
power setting near 90%.  At that power setting your fuel flow would closer 
to 14 GPH than 7 GPH.  Your CHT numbers are consistent with a high power 
setting.  My numbers at 8000 feet density altitude, 2600 RPM, 20 inhg, 8.9 
GPH, TAS 172 Knts, OAT 12C.  Hottest CHT #1 291F, coolest #5 216F.  My climb 
power setting is 2600 RPM/25 MAP with a fuel flow around 14 GPH.

Larry Coen
N136LC SE/RG Franklin/IVO
  ----- Original Message ----- 
  From: Hiroo Umeno
  To: Velocity Aircraft Owners and Builders list
  Sent: Sunday, September 24, 2006 11:04 PM
  Subject: REFLECTOR: Primer Works


  Today, I finished the installation of the primer.

  Essentially, it is as suggested in this forum.  I used an elbow, tapped 
with 1/4-20 thread, brass screw with frange trimmed with 1/32" hole drilled 
throuugh its shank as the nozzle.  Hard line to the front of the induction 
pipe (beyond the high-temp areas around the exhaust), then flexible hose to 
the manifold on the firewall, which T's the feeder from the solenoid.  My 
current start procedure goes like this.

  Master - ON
  Mags - Both
  Mixture - Full Rich
  Boost - ON (Shows fuel flow.  Wait until flow settles down to 0)
  Throttol - Open 1/4"
  Primer - ON (2 - 4 sec as needed.  Flow will show 1.2GPH or so)
  Clear Prop!
  Crank.

  Using this procedure, the engine started within 5 seconds or so of 
cranking.  It at first started firing intermittent before settling into a 
nice regular run.

  Thanks, all for the suggestions on the primer.

  On yesterday's flight, I took the plane up to 147Kts indicated straight 
and level, 4500ft, 2710rpm, 24.3MAP, fuel flow showing 7.0GPH.  Oil at 
197degF, Hottest cylinder #6 running 344, coolest #2 running 308.

  Do these seem reasonable?  The plane does not have wheel pants, surfaces 
are rough, wing-bolt holes uncoversd, cowl gaps not sealed, etc.  It is in a 
pretty dirty configuration right now.



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