Subject: [Spridgets] To ballast or not - Bugeye with 1275, neg. ground

From: Walt Swift via Spridgets <[email-masked]>
Date: Mon, 4 May 2015 10:36:41 +0000 (UTC)

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I'm finishing on the restoration of my Bugeye with modifications. =C2=A0It =
has a 1275 cc engine, negative ground system with a new alternator and Cran=
e ignition (XR700). =C2=A0The coil is stamped=C2=A0BYS 11P12 - apparently a=
 Lucas DLB101equivalent. The resistance across the +/- terminals of the coi=
l with no connections is about 3.4 ohms. =C2=A0The circuit is at present wi=
thout any ballast resistor. =C2=A0I'm trying to figure out whether I need t=
o add a ballast resistor. =C2=A0I've read somewhere that for a coil with th=
is low a resistance, the running voltage will be excessive (to what?). =C2=
=A0I see no ballasts in spridget wiring diagrams before about 1975.
Any advice/insight would be very much appreciated.
Walt - (nearly ready for first light & smoke)=C2=A0
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:He=
lveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;fo=
nt-size:16px"><div id=3D"yui_3_16_0_1_1430734736218_7912" dir=3D"ltr">I'm f=
inishing on the restoration of my Bugeye with modifications. &nbsp;It has a=
 1275 cc engine, negative ground system with a new alternator and Crane ign=
ition (XR700). &nbsp;The coil is stamped&nbsp;<span style=3D"font-family: V=
erdana; font-size: 12px;" class=3D"" id=3D"yui_3_16_0_1_1430734736218_8156"=
>BYS 11P12 - apparently a Lucas DLB101equivalent. The resistance across the=
 +/- terminals of the coil with no connections is about 3.4 ohms. &nbsp;The=
 circuit is at present without any ballast resistor. &nbsp;I'm trying to fi=
gure out whether I need to add a ballast resistor. &nbsp;I've read somewher=
e that for a coil with this low a resistance, the running voltage will be e=
xcessive (to what?). &nbsp;I see no ballasts in spridget wiring diagrams be=
fore about 1975.</span></div><div id=3D"yui_3_16_0_1_1430734736218_7912" di=
r=3D"ltr"><span style=3D"font-family: Verdana; font-size: 12px;" class=3D""=
><br></span></div><div id=3D"yui_3_16_0_1_1430734736218_7912" dir=3D"ltr"><=
span style=3D"font-family: Verdana; font-size: 12px;" class=3D"" id=3D"yui_=
3_16_0_1_1430734736218_8231">Any advice/insight would be very much apprecia=
ted.</span></div><div id=3D"yui_3_16_0_1_1430734736218_7912" dir=3D"ltr"><s=
pan style=3D"font-family: Verdana; font-size: 12px;" class=3D""><br></span>=
</div><div id=3D"yui_3_16_0_1_1430734736218_7912" dir=3D"ltr"><span style=
=3D"font-family: Verdana; font-size: 12px;" class=3D"" id=3D"yui_3_16_0_1_1=
430734736218_8246">Walt - (nearly ready for first light &amp; smoke)</span>=
</div><div id=3D"yui_3_16_0_1_1430734736218_7912" dir=3D"ltr" class=3D"" st=
yle=3D"">&nbsp;</div></div></body></html>
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[email-masked]

Archive: http://www.team.net/archive

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From: Kevin Valentine via Spridgets <[email-masked]>
Date: Mon, 4 May 2015 07:33:38 -0400

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Walt,

A standard internally ballasted coil is usually about 3 Ohms.  This would
be a coil that needs no external ballast resistor.  You may consider using
a coil recommended by the electronic ignition manufacturer.

More info....  Here's a short thread pertaining to your question ;)

http://www.theminiforum.co.uk/forums/topic/228835-coil-ohm-reading-quick-question/

Kevin V.
Tuscarora, Pa

On Mon, May 4, 2015 at 6:36 AM, Walt Swift via Spridgets <
[email-masked]> wrote:

> I'm finishing on the restoration of my Bugeye with modifications.  It has
> a 1275 cc engine, negative ground system with a new alternator and Crane
> ignition (XR700).  The coil is stamped BYS 11P12 - apparently a Lucas
> DLB101equivalent. The resistance across the +/- terminals of the coil with
> no connections is about 3.4 ohms.  The circuit is at present without any
> ballast resistor.  I'm trying to figure out whether I need to add a ballast
> resistor.  I've read somewhere that for a coil with this low a resistance,
> the running voltage will be excessive (to what?).  I see no ballasts in
> spridget wiring diagrams before about 1975.
>
> Walt - (nearly ready for first light & smoke)
>
>
> ------------------------
>
> [email-masked]
>
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> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/spridgets/[email-masked]
>
>

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<div dir=3D"ltr">Walt,<div><br></div><div><font color=3D"#282828" face=3D"h=
elvetica, arial, sans-serif"><span style=3D"font-size:14px;line-height:22.3=
999996185303px">A standard=C2=A0</span></font><span style=3D"color:rgb(40,4=
0,40);font-family:helvetica,arial,sans-serif;font-size:14px;line-height:22.=
3999996185303px">internally ballasted</span><span style=3D"font-size:14px;l=
ine-height:22.3999996185303px;color:rgb(40,40,40);font-family:helvetica,ari=
al,sans-serif">=C2=A0coil is usually about 3 Ohms.=C2=A0</span><font color=
=3D"#282828" face=3D"helvetica, arial, sans-serif"><span style=3D"font-size=
:14px;line-height:22.3999996185303px">=C2=A0This would be a coil that needs=
 no external ballast resistor.=C2=A0 You may consider using a coil=C2=A0rec=
ommended=C2=A0by the electronic ignition=C2=A0manufacturer.=C2=A0</span></f=
ont></div><div><div><br></div><div>More info....=C2=A0 Here&#39;s a short t=
hread pertaining to your question ;)</div><div><br></div><div><a href=3D"ht=
tp://www.theminiforum.co.uk/forums/topic/228835-coil-ohm-reading-quick-ques=
tion/">http://www.theminiforum.co.uk/forums/topic/228835-coil-ohm-reading-q=
uick-question/</a><br></div><div><br></div><div>Kevin V.</div><div>Tuscaror=
a, Pa</div><div><br></div><div><br></div></div></div><div class=3D"gmail_ex=
tra"><br><div class=3D"gmail_quote">On Mon, May 4, 2015 at 6:36 AM, Walt Sw=
ift via Spridgets <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]=
eam.net" target=3D"_blank">[email-masked]</a>&gt;</span> wrote:<b=
r><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex"><div><div style=3D"color:#000;background-c=
olor:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida G=
rande,sans-serif;font-size:16px"><div dir=3D"ltr">I&#39;m finishing on the =
restoration of my Bugeye with modifications.=C2=A0 It has a 1275 cc engine,=
 negative ground system with a new alternator and Crane ignition (XR700).=
=C2=A0 The coil is stamped=C2=A0<span style=3D"font-family:Verdana;font-siz=
e:12px">BYS 11P12 - apparently a Lucas DLB101equivalent. The resistance acr=
oss the +/- terminals of the coil with no connections is about 3.4 ohms.=C2=
=A0 The circuit is at present without any ballast resistor.=C2=A0 I&#39;m t=
rying to figure out whether I need to add a ballast resistor.=C2=A0 I&#39;v=
e read somewhere that for a coil with this low a resistance, the running vo=
ltage will be excessive (to what?).=C2=A0 I see no ballasts in spridget wir=
ing diagrams before about 1975.</span></div><div dir=3D"ltr"><span style=3D=
"font-family:Verdana;font-size:12px"><br></span></div><div dir=3D"ltr"><spa=
n style=3D"font-family:Verdana;font-size:12px">Any advice/insight would be =
very much appreciated.</span></div><div dir=3D"ltr"><span style=3D"font-fam=
ily:Verdana;font-size:12px"><br></span></div><div dir=3D"ltr"><span style=
=3D"font-family:Verdana;font-size:12px">Walt - (nearly ready for first ligh=
t &amp; smoke)</span></div><div dir=3D"ltr">=C2=A0</div></div></div><br>---=
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<br></blockquote></div><br></div>

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