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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Re: Electronic Ignition
X-Original-Date: Tue, 18 Oct 2005 13:48:05 -0500
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Heck, Scott, I use WOT at ALL altitudes!  I guess we have the same=20
disease. <hehehehe>

Walter


On Oct 18, 2005, at 12:45 PM, Sky2high@aol.com wrote:


In a message dated 10/18/2005 9:22:03 A.M. Central Standard Time,=20
rsmiley@centurytel.net writes:
> Walter, I do not know anything about internal pressures. Not my=20
> expertise so I must depend upon others.=A0 I plan to use full power on=20=

> takeoff. Once I am 500 agl is reached, reduce power for lower altitude=20=

> flying and climbout and incrementally increase power as=A0 altitude=20
> increases. Maintaining a constant=A0reasonable manifold pressure might=20=

> be a likely scenario. =A0Full throttle at=A0 14,000 ft. is equivalent =
to=20
> 75% power at 7,500 ft. of the original configuration.=A0 This is=20
> according to Ken at Lycon.Walter, Bob,
=A0
That's an interesting claim by Lycon.=A0 MAP not to be confused with=20
compression ratio.=A0 Because of the high compression pistons, your LSE=20=

base timing=A0should be set to provide=A0much less spark advance.=A0 At =
high=20
power settings (high MAP), the spark will be=A0advanced to about 20=20
degrees BTDC.=A0 Below 75% power (whatever that means), or more likely=20=

below 23 or so inches of MAP,=A0the spark will be advanced beyond 25=20
degrees.=A0 It is=A0only at a relatively low MAP that more=20
interesting=A0spark advance occurs.
=A0
Bob, if you have included the LSE display, you will be able to note the=20=

timing under various MAP/RPM combinations.=A0 Perhaps Walter or George=20=

can explain the significance of the high compression ratio (10.5:1) at=20=

different MAP/RPM and spark timing scenarios with respect to cylinder=20
pressures.
=A0
I climb quite differently than your proposal.=A0 WOT, 2600 RPM, constant=20=

speed (about 135 KIAS) and adjust the mixture to maintain EGTs near to=20=

takeoff value - 100 to 120 ROP.=A0 =A0I run full throttle at any =
altitude=20
that causes the ram air enhanced MAP to drop below 25" (approximately=20
above 6500 MSL) and 2500 RPM.=A0 Of course, WOT is used during cross=20
country=A0races at any altitude.
=A0
Scott Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)




--Apple-Mail-4-1030229963
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Heck, Scott, I use WOT at ALL altitudes!  I guess we have the same
disease. <<hehehehe>


Walter



On Oct 18, 2005, at 12:45 PM, Sky2high@aol.com wrote:



<fontfamily><param>Arial</param><smaller>In a message dated 10/18/2005
9:22:03 A.M. Central Standard Time, rsmiley@centurytel.net =
writes:</smaller></fontfamily>

<excerpt><fontfamily><param>Arial</param><smaller>Walter, I do not
know anything about internal pressures. Not my expertise so I must
depend upon others.=A0 I plan to use full power on takeoff. Once I am
500 agl is reached, reduce power for lower altitude flying and
climbout and incrementally increase power as=A0 altitude increases.
Maintaining a constant=A0reasonable manifold pressure might be a likely
scenario. =A0Full throttle at=A0 14,000 ft. is equivalent to 75% power =
at
7,500 ft. of the original configuration.=A0 This is according to Ken at
Lycon.Walter, Bob,</smaller></fontfamily>

=
</excerpt><fontfamily><param>Arial</param><smaller>=A0</smaller></fontfami=
ly>

<fontfamily><param>Arial</param><smaller>That's an interesting claim
by Lycon.=A0 MAP not to be confused with compression ratio.=A0 Because =
of
the high compression pistons, your LSE base timing=A0should be set to
provide=A0much less spark advance.=A0 At high power settings (high MAP),
the spark will be=A0advanced to about 20 degrees BTDC.=A0 Below 75% =
power
(whatever that means), or more likely below 23 or so inches of
MAP,=A0the spark will be advanced beyond 25 degrees.=A0 It is=A0only at =
a
relatively low MAP that more interesting=A0spark advance =
occurs.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Bob, if you have included the
LSE display, you will be able to note the timing under various MAP/RPM
combinations.=A0 Perhaps Walter or George can explain the significance
of the high compression ratio (10.5:1) at different MAP/RPM and spark
timing scenarios with respect to cylinder =
pressures.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>I climb quite differently
than your proposal.=A0 WOT, 2600 RPM, constant speed (about 135 KIAS)
and adjust the mixture to maintain EGTs near to takeoff value - 100 to
120 ROP.=A0 =A0I run full throttle at any altitude that causes the ram =
air
enhanced MAP to drop below 25" (approximately above 6500 MSL) and 2500
RPM.=A0 Of course, WOT is used during cross country=A0races at any
altitude.</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>=A0</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Scott Krueger AKA =
Grayhawk</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Lancair N92EX IO320 SB =
89/96</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Aurora, IL =
(KARR)</smaller></fontfamily>





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