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I agree, a lot of electrons going through there, and the red plastic rubbing
block on the modern points has its limit.Points are fine on a 4-cylinder
engine, if all is kept in order, but a 6-cylinder at those revs is pretty much
at the limit; it has to do with coil saturation time, the amount of time that
the points are closed.There's a limit to how fast the points can be made to
open and close, just like a cam/valve action, and the modern optical & magnetic
units are instantaneous and allow max saturation time for a good spark.A
6-cylinder @ those revs would likely benefit from a modern unit.Glen
-----Original Message-----
From: Bill Tobin via Fot <fot@autox.team.net>
To: fot <fot@autox.team.net>
Sent: Mon, Sep 9, 2019 1:18 pm
Subject: Re: [Fot] Ignition coil for 6 cylinder with points (racing)
Jason, sounds like you have too much current going through the points. Maybe
try an external ballast resistor. (Ask me how I learned this!). Why not go
Pertronix or other pointless distributors? KISS. But always carry a spare!
Cheers, Bill
On 9/9/2019 11:07 AM, Jason Sukey via Fot wrote:
Had a wonderful time at the Glen, still chasing some gremlins, but getting
closer!
I've been struggling with points on my GT6, before I throw them away and buy
a 123tune dizzy, I'd like to survey the other 6 cylinder guys to see if anyone
has found a good setup that works with points.
My engine is about 12.5:1 compression, typically shifting just under 7000
rpm, but will rev to 7300 rpm depending on the situation.?? Lucas 25D6 dizzy
built by Advanced Distributors. NGK BP8ES plugs, .028" gap. Points are the ones
with the red plastic that come in the green "lucas" box, gapped to .015"
The problem:?? I keep melting the plastic block on the points causing the
point gap to close up to zero.?? At the suggestion of Jeff at Advanced
Distributors, I replaced the 1.5 ohm coil with a 3.0 ohm coil (no ballast
resistor).?? With the 3.0 ohm coil, the points??seem to last, but the car won't
rev past 5000 rpm.
With the hotter 1.5 ohm coil, the car runs really strong, and as long as I
don't let the engine idle for very long, the points will last a couple
sessions.?? I've been thru three sets of points, tried two different condensers
all with similar results.
The tow crew at Watkins Glen is very efficient, I pulled off behind the armco
on the pace lap and was still able to watch all but the first two laps of the
all Triumph feature from the stands!
Jason Sukey
_______________________________________________fot@autox.team.nethttp://www.fot-racing.comDonate:
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<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"2">I agree, a lot of electrons going through there, and=
the red plastic rubbing block on the modern points has its limit.</font></=
div>
<div><font size=3D"2">Points are fine on a 4-cylinder engine, if all is kep=
t in order, but a 6-cylinder at those revs is pretty much at the limit; it =
has to do with coil saturation time, the amount of time that the points are=
closed.</font></div>
<div><font size=3D"2">There's a limit to how fast the points can be made to=
open and close, just like a cam/valve action, and the modern optical &=
magnetic units are instantaneous and allow max saturation time for a good =
spark.</font></div>
<div><font size=3D"2">A 6-cylinder @ those revs would likely benefit from a=
modern unit.</font></div>
<div><font size=3D"2">Glen</font><br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Bill Tobin via Fot <fot@autox.team.net><br>
To: fot <fot@autox.team.net><br>
Sent: Mon, Sep 9, 2019 1:18 pm<br>
Subject: Re: [Fot] Ignition coil for 6 cylinder with points (racing)<br>
<br>
<div id=3D"yiv0240578459">
<div>
=20
<div>Jason, sounds like you have too much current going through the
points. Maybe try an external ballast resistor. (Ask me how I
learned this!).</div>
=20
<div>Why not go Pertronix or other pointless distributors? KISS. But
always carry a spare!<br clear=3D"none">
</div>
=20
<div>Cheers, Bill<br clear=3D"none">
</div>
=20
<div class=3D"yiv0240578459yqt6281591226" id=3D"yiv0240578459yqtfd86075">
<div class=3D"yiv0240578459moz-cite-prefix">On 9/9/2019 11:07 AM, Jason Suk=
ey via
Fot wrote:<br clear=3D"none">
</div>
<blockquote type=3D"cite">
</blockquote></div>
</div>
<div class=3D"yiv0240578459yqt6281591226" id=3D"yiv0240578459yqtfd75349"></=
div>
<div>
<div class=3D"yiv0240578459yqt6281591226" id=3D"yiv0240578459yqtfd63555">
<div dir=3D"ltr">Had a wonderful time at the Glen, still chasing
some gremlins, but getting closer!
=20
<div><br clear=3D"none">
</div>
=20
<div>I've been struggling with points on my GT6, before I throw
them away and buy a 123tune dizzy, I'd like to survey the
other 6 cylinder guys to see if anyone has found a good setup
that works with points.</div>
=20
<div><br clear=3D"none">
</div>
=20
<div>My engine is about 12.5:1 compression, typically shifting
just under 7000 rpm, but will rev to 7300 rpm depending on the
situation.?? Lucas 25D6 dizzy built by Advanced Distributors.</di=
v>
=20
<div>NGK BP8ES plugs, .028" gap.</div>
=20
<div>Points are the ones with the red plastic that come in the
green "lucas" box, gapped to .015"</div>
=20
<div><br clear=3D"none">
</div>
=20
<div>The problem:?? I keep melting the plastic block on the
points causing the point gap to close up to zero.?? At the
suggestion of Jeff at Advanced Distributors, I replaced the
1.5 ohm coil with a 3.0 ohm coil (no ballast resistor).?? With
the 3.0 ohm coil, the points??seem to last, but the car won't
rev past 5000 rpm.</div>
=20
<div><br clear=3D"none">
</div>
=20
<div>With the hotter 1.5 ohm coil, the car runs really strong,
and as long as I don't let the engine idle for very long, the
points will last a couple sessions.?? I've been thru three sets
of points, tried two different condensers all with similar
results.</div>
=20
<div><br clear=3D"none">
</div>
=20
<div>The tow crew at Watkins Glen is very efficient, I pulled
off behind the armco on the pace lap and was still able to
watch all but the first two laps of the all Triumph feature
from the stands!</div>
=20
<div><br clear=3D"none">
</div>
=20
<div>Jason Sukey</div>
=20
<div><br clear=3D"none">
</div>
</div>
<br clear=3D"none">
<fieldset class=3D"yiv0240578459mimeAttachmentHeader"></fieldset>
</div>
<pre class=3D"yiv0240578459moz-quote-pre">
<div class=3D"yiv0240578459yqt6281591226" id=3D"yiv0240578459yqtfd76668">__=
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<div class=3D"yiv0240578459yqt6281591226" id=3D"yiv0240578459yqtfd45160">
</div>
</pre>
<div class=3D"yiv0240578459yqt6281591226" id=3D"yiv0240578459yqtfd47683">
=20
</div>
</div>
</div>
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_______________________________________________
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