Posted for "Frederick Moreno" <fredmoreno@optusnet.com.au>:

 George:
 
 
 
 I believe you.  We were definitely detonation challenged!
 
 
 
 I can only report what we recorded and I subsequently committed to
 memory, my note book being long gone.  There may be a brain fade
 problem, not unlikely given my advancing age.  :-(
 
 
 
 It was clear that about 30 gph (or whatever we were working toward) was
 not enough.  The engine was a Lycoming, not a Continental, but I'm not
 sure that makes a hill of beans difference.  I leave it to others to
 comment.
 
 
 
 I would ask Brent to chime in if he remembers differently, particularly
 details of temperature, manifold pressure, and compression ratio.
 
 
 
Forgetful Fred?
 
 
 
 -----Original Message-----
From: George Braly [mailto:gwbraly@gami.com]
 Sent: Tuesday, 25 April 2006 7:49 AM
 Subject: RE: [LML] Compression, boost, and detonation
 
 
 
Fred,
 
 
 
 That is a fascinating description of that flight.
 
 
 
 Based on having run a similar engine with 8.5:1  (TSIO-550) on a test
 stand with internal cylinder pressure transducers,  I would predict that
 it would be difficult to avoid detonation under your flight conditions
 and at 320 Hp at any fuel flow less than about 0.66 to 0.68 BSFC.  That
 is about  35 to 37 gph.
 
 
 
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