In a message dated 1/4/2008 7:33:25 A.M. Central Standard Time,
douglasbrunner@earthlink.net writes:
I have been thinking a little bit about this issue. I would like to
add my 2 cents
and see what others (particularly Adkinson and Braly) have to say
about this issue.
Doug,
Go here:
and read Ignition Dynamics I, II & III.
20 or 25 Degrees BTDC (depending on compression ratio) provides a
reasonable compromise for standard flying at 75% (plus or minus a
bit). The timing makes a bigger difference at higher altitudes
where NA engines are operating at reduced power enforced by lack of MAP.
The EI also makes a big difference in starting and high power operations - like
take off.
If the PRISM system ever becomes available, it will have an electronic
ignition.
Scott Krueger
AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
Pilot
not TSO'd, Certificated score only >
70%.