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Subject: RE: [LML] HELP! Lightspeed ignition problem
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Fred, you didn't say that you have checked and double checked the gap
between the magnets and the pickups (guessing the direct crank fired model).
That can vary a little with the load on the prop, as the crank moves
axially, and can cause intermittent operations.
You can push and pull on the prop and check the gap at both extremes, and
make sure it stays within specs.
John Huft
RV spy
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Frederick Moreno
Sent: Wednesday, September 09, 2009 6:25 AM
To: lml@lancaironline.net
Subject: [LML] HELP! Lightspeed ignition problem
Major hair loss and frustration arising from an intermittent, persistent,
and worsening problem with my Lightspeed ignition on my IO-550. (Magneto on
second system.) Any help or guesses would be greatly appreciated.
The Problem: bad missing on run up when running Lightspeed only. Missing in
No. 1 cylinder, when it occurred, which is irregular.
Here is where it gets weird: It only happens when the plenum and cowl are
on. Plenum off: no problem, Plenum on, sometimes a problem. Today no
problem. Put plenum and top cowl on: big problem, lots of missing on no. 1
cylinder (not number 2) as evidenced by rapidly rising EGT during the
missing.
That would seem to suggest cooling air flow is wiggling something around.
If so, we have not found it yet.
What we have tried:
. Switched ignition coil for 1-2, put in new.
. Switched plug lines between 1-2
. Switched spark plugs.
. Substituted new high tension line for cyl 1. Seemed to help
until we put the cowl back on. Problem resumed.
. Ran timing light (cowl off) on all spark plugs, got good clean
signals, but then there was no missing with the cowl off. We may want to
try again with cowl on and run the timing light wires out somehow.
. Checked timing against spec, got good steady consistent signals
from the timing light, but again, this was cowl and plenum off.
. Rerouted all primary and secondary leads with separation from each
other and from ground surfaces.
. Checked all possible places where wires might rub or wiggle due
to cooling air blast when cowl is on. Secured all lines with lots of tie
wraps to prevent wind driven wiggles.
. Rerouted all suspicious secondary lines keeping them well clear of
everything.
. Tied all lines down to restrict possibility of wires flopping
around under the cooling air blast when cowl is on.
Right now, the only really definitive data is:
. Missing only occurs when cowl and plenum are on.
. Missing is in cylinder 1, NOT 1 and 2 at the same time. That
suggests a secondary wire fault, but substitutions yielded no improvements.
. All plugs are new (fewer than 5 hours) and appear clean and new
There is only one thing we have not tried (we think): My Lightspeed box is
mounted on the front of the firewall, inside of a fibreglass box to which is
routed a 1 inch SCAT line that directs cooling air from above the engine
into the box and into the little cooling air port that Klaus puts into his
six cylinder ignition systems. Theory: cowl on, lots of air flow, something
is happening inside the box that somehow affects cyl 1 (but not two, which
is a mental puzzle as there is only one primary line from the box to the
coil for cyls 1-2). We will try again tomorrow with the cooling air blast
tube connected and then disconnected and see if we can find any change, and
then it is time to dig into the box.
We are really grasping at straws here, and have a pile of straws several
feet high that yielded no results. Any suggestions or speculations welcome.
We may have to hire a mechanic with psychic powers.
Frustrated Fred
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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Fred, you didn’t say that you have checked and =
double
checked the gap between the magnets and the pickups (guessing the direct =
crank
fired model). That can vary a little with the load on the prop, as the =
crank
moves axially, and can cause intermittent =
operations.<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You can push and pull on the prop and check the gap at =
both
extremes, and make sure it stays within specs.<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John Huft<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>RV spy<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'>
<p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Lancair =
Mailing
List [mailto:lml@lancaironline.net] <b>On Behalf Of </b>Frederick =
Moreno<br>
<b>Sent:</b> Wednesday, September 09, 2009 6:25 AM<br>
<b>To:</b> lml@lancaironline.net<br>
<b>Subject:</b> [LML] HELP! Lightspeed ignition =
problem<o:p></o:p></span></p>
</div>
</div>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal><span lang=3DEN-AU>Major hair loss and frustration =
arising
from an intermittent, persistent, and worsening problem with my =
Lightspeed
ignition on my IO-550. (Magneto on second system.) Any =
help
or guesses would be greatly appreciated. <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU>The Problem: bad missing on run =
up when
running Lightspeed only. Missing in No. 1 cylinder, when it =
occurred,
which is irregular. <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU>Here is where it gets weird: It =
only
happens when the plenum and cowl are on. Plenum off: no =
problem,
Plenum on, sometimes a problem. Today no problem. Put plenum =
and
top cowl on: big problem, lots of missing on no. 1 cylinder (not number =
2) as
evidenced by rapidly rising EGT during the missing. =
<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU>That would seem to suggest =
cooling air flow
is wiggling something around. If so, we have not found it yet. =
<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU>What we have tried: =
<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Switched ignition coil =
for 1-2,
put in new. <o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Switched plug lines =
between 1-2<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Switched spark plugs. =
<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Substituted new high =
tension
line for cyl 1. Seemed to help until we put the cowl back =
on.
Problem resumed.<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Ran timing light (cowl =
off) on
all spark plugs, got good clean signals, but then there was no =
missing
with the cowl off. We may want to try again with cowl on and =
run
the timing light wires out somehow. <o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Checked timing against =
spec,
got good steady consistent signals from the timing light, but again, =
this was
cowl and plenum off.<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Rerouted all primary =
and
secondary leads with separation from each other and from ground =
surfaces.
<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Checked all =
possible
places where wires might rub or wiggle due to cooling air blast =
when cowl
is on. Secured all lines with lots of tie wraps to prevent wind =
driven
wiggles.<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Rerouted all =
suspicious
secondary lines keeping them well clear of =
everything.<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 =
level1 lfo2'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Tied all lines down to =
restrict
possibility of wires flopping around under the cooling air blast when =
cowl is
on. <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU>Right now, the only really =
definitive data
is:<o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l1 =
level1 lfo4'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Missing only occurs =
when cowl
and plenum are on. <o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l1 =
level1 lfo4'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>Missing is in =
cylinder 1,
NOT 1 and 2 at the same time. That suggests a secondary wire =
fault,
but substitutions yielded no improvements. <o:p></o:p></span></p>
<p class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l1 =
level1 lfo4'><![if !supportLists]><span
lang=3DEN-AU style=3D'font-family:Symbol'><span =
style=3D'mso-list:Ignore'>·<span
style=3D'font:7.0pt "Times New =
Roman"'>
</span></span></span><![endif]><span lang=3DEN-AU>All plugs are new =
(fewer than 5
hours) and appear clean and new <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU> <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU>There is only one thing we have =
not tried
(we think): My Lightspeed box is mounted on the front of the firewall, =
inside
of a fibreglass box to which is routed a 1 inch SCAT line that directs =
cooling
air from above the engine into the box and into the little cooling air
port that Klaus puts into his six cylinder ignition systems.
Theory: cowl on, lots of air flow, something is happening inside the box =
that
somehow affects cyl 1 (but not two, which is a mental puzzle as there is =
only
one primary line from the box to the coil for cyls 1-2). We will =
try
again tomorrow with the cooling air blast tube connected and then =
disconnected
and see if we can find any change, and then it is time to dig into the =
box. <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU>We are really grasping at straws =
here, and
have a pile of straws several feet high that yielded no results. =
Any
suggestions or speculations welcome. We may have to hire a =
mechanic with
psychic powers. <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU>Frustrated =
Fred<o:p></o:p></span></p>
<p class=3DMsoNormal style=3D'margin-left:.25in'><span =
lang=3DEN-AU><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-AU><o:p> </o:p></span></p>
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