Subject: [Mgs] Coil resistance for Lucas 25D

From: William Killeffer <[email-masked]>
Date: Sun, 25 Feb 2024 16:20:00 -0500

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Hello everyone,

My car's a 1974 MGB with an 18GK engine and twin HS4 carbs. I've been runnin=
g a Pertronix distributor with its matching coil for awhile, but just got th=
e car's 25D back from Jeff at Advance, and it looks better than what it prob=
ably did when it was new. I'm going to go back to using points and condenser=
 with the rebuilt distributor.=20

I still have the factory Lucas coil that came with the car when I first obta=
ined it. I checked the resistance to see if it was still useful, and here's w=
hat I found:

With a small handheld analog meter, it registered around 6700ohm across the s=
econdary, and the little meter's not capable of giving a reading for the pri=
mary.

On the new-to-me Sears Engine Analyzer, the primary shows 5.6ohm and the sec=
ondary shows 5100ohm.

Either way, that looks too high given some of the other numbers I've seen. I=
 haven't checked the Pertronix coil, but will before trying to use it.

Am I right in believing this original coil shouldn't be used?

Thank you,
-Bill
Sent from my iPhone=

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><span style=3D"caret-color: rgb(20, 20, 20)=
; color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helvetica=
 Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&q=
uot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text-size=
-adjust: 100%; background-color: rgb(254, 254, 254);">Hello everyone,</span>=
<br style=3D"box-sizing: border-box; margin-top: 0px; caret-color: rgb(20, 2=
0, 20); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Hel=
vetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira S=
ans&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text=
-size-adjust: 100%;"><br style=3D"box-sizing: border-box; caret-color: rgb(2=
0, 20, 20); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot=
;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fi=
ra Sans&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-=
text-size-adjust: 100%;"><span style=3D"caret-color: rgb(20, 20, 20); color:=
 rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helvetica Neue&qu=
ot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&quot;, &q=
uot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text-size-adjust:=
 100%; background-color: rgb(254, 254, 254);">My car's a 1974 MGB with an 18=
GK engine and twin HS4 carbs. I've been running a Pertronix distributor with=
 its matching coil for awhile, but just got the car's 25D back from Jeff at A=
dvance, and it looks better than what it probably did when it was new. I'm g=
oing to go back to using points and condenser with the rebuilt distributor.&=
nbsp;</span><br style=3D"box-sizing: border-box; caret-color: rgb(20, 20, 20=
); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helvetic=
a Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&=
quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text-siz=
e-adjust: 100%;"><br style=3D"box-sizing: border-box; caret-color: rgb(20, 2=
0, 20); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Hel=
vetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira S=
ans&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text=
-size-adjust: 100%;"><span style=3D"caret-color: rgb(20, 20, 20); color: rgb=
(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helvetica Neue&quot;,=
 Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&quot;, &quot;=
Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text-size-adjust: 100=
%; background-color: rgb(254, 254, 254);">I still have the factory Lucas coi=
l that came with the car when I first obtained it. I checked the resistance t=
o see if it was still useful, and here's what I found:</span><br style=3D"bo=
x-sizing: border-box; caret-color: rgb(20, 20, 20); color: rgb(20, 20, 20); f=
ont-family: &quot;Segoe UI&quot;, &quot;Helvetica Neue&quot;, Helvetica, Rob=
oto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&quot;, &quot;Droid Sans&quot=
;, sans-serif; font-size: 15px; -webkit-text-size-adjust: 100%;"><br style=3D=
"box-sizing: border-box; caret-color: rgb(20, 20, 20); color: rgb(20, 20, 20=
); font-family: &quot;Segoe UI&quot;, &quot;Helvetica Neue&quot;, Helvetica,=
 Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&quot;, &quot;Droid Sans&=
quot;, sans-serif; font-size: 15px; -webkit-text-size-adjust: 100%;"><span s=
tyle=3D"caret-color: rgb(20, 20, 20); color: rgb(20, 20, 20); font-family: &=
quot;Segoe UI&quot;, &quot;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, U=
buntu, Cantarell, &quot;Fira Sans&quot;, &quot;Droid Sans&quot;, sans-serif;=
 font-size: 15px; -webkit-text-size-adjust: 100%; background-color: rgb(254,=
 254, 254);">With a small handheld analog meter, it registered around 6700oh=
m across the secondary, and the little meter's not capable of giving a readi=
ng for the primary.</span><br style=3D"box-sizing: border-box; caret-color: r=
gb(20, 20, 20); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &=
quot;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &qu=
ot;Fira Sans&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -we=
bkit-text-size-adjust: 100%;"><br style=3D"box-sizing: border-box; caret-col=
or: rgb(20, 20, 20); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quo=
t;, &quot;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell=
, &quot;Fira Sans&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px=
; -webkit-text-size-adjust: 100%;"><span style=3D"caret-color: rgb(20, 20, 2=
0); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helveti=
ca Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans=
&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text-si=
ze-adjust: 100%; background-color: rgb(254, 254, 254);">On the new-to-me Sea=
rs Engine Analyzer, the primary shows 5.6ohm and the secondary shows 5100ohm=
.</span><br style=3D"box-sizing: border-box; caret-color: rgb(20, 20, 20); c=
olor: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helvetica Ne=
ue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&quot=
;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text-size-ad=
just: 100%;"><br style=3D"box-sizing: border-box; caret-color: rgb(20, 20, 2=
0); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helveti=
ca Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans=
&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text-si=
ze-adjust: 100%;"><span style=3D"caret-color: rgb(20, 20, 20); color: rgb(20=
, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helvetica Neue&quot;, He=
lvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&quot;, &quot;Dro=
id Sans&quot;, sans-serif; font-size: 15px; -webkit-text-size-adjust: 100%; b=
ackground-color: rgb(254, 254, 254);">Either way, that looks too high given s=
ome of the other numbers I've seen. I haven't checked the Pertronix coil, bu=
t will before trying to use it.</span><br style=3D"box-sizing: border-box; c=
aret-color: rgb(20, 20, 20); color: rgb(20, 20, 20); font-family: &quot;Sego=
e UI&quot;, &quot;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, C=
antarell, &quot;Fira Sans&quot;, &quot;Droid Sans&quot;, sans-serif; font-si=
ze: 15px; -webkit-text-size-adjust: 100%;"><br style=3D"box-sizing: border-b=
ox; caret-color: rgb(20, 20, 20); color: rgb(20, 20, 20); font-family: &quot=
;Segoe UI&quot;, &quot;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubun=
tu, Cantarell, &quot;Fira Sans&quot;, &quot;Droid Sans&quot;, sans-serif; fo=
nt-size: 15px; -webkit-text-size-adjust: 100%;"><span style=3D"caret-color: r=
gb(20, 20, 20); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &=
quot;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &qu=
ot;Fira Sans&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -we=
bkit-text-size-adjust: 100%; background-color: rgb(254, 254, 254);">Am I rig=
ht in believing this original coil shouldn't be used?</span><br style=3D"box=
-sizing: border-box; caret-color: rgb(20, 20, 20); color: rgb(20, 20, 20); f=
ont-family: &quot;Segoe UI&quot;, &quot;Helvetica Neue&quot;, Helvetica, Rob=
oto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&quot;, &quot;Droid Sans&quot=
;, sans-serif; font-size: 15px; -webkit-text-size-adjust: 100%;"><br style=3D=
"box-sizing: border-box; caret-color: rgb(20, 20, 20); color: rgb(20, 20, 20=
); font-family: &quot;Segoe UI&quot;, &quot;Helvetica Neue&quot;, Helvetica,=
 Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans&quot;, &quot;Droid Sans&=
quot;, sans-serif; font-size: 15px; -webkit-text-size-adjust: 100%;"><span s=
tyle=3D"caret-color: rgb(20, 20, 20); color: rgb(20, 20, 20); font-family: &=
quot;Segoe UI&quot;, &quot;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, U=
buntu, Cantarell, &quot;Fira Sans&quot;, &quot;Droid Sans&quot;, sans-serif;=
 font-size: 15px; -webkit-text-size-adjust: 100%; background-color: rgb(254,=
 254, 254);">Thank you,</span><br style=3D"box-sizing: border-box; caret-col=
or: rgb(20, 20, 20); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quo=
t;, &quot;Helvetica Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell=
, &quot;Fira Sans&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px=
; -webkit-text-size-adjust: 100%;"><span style=3D"caret-color: rgb(20, 20, 2=
0); color: rgb(20, 20, 20); font-family: &quot;Segoe UI&quot;, &quot;Helveti=
ca Neue&quot;, Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Fira Sans=
&quot;, &quot;Droid Sans&quot;, sans-serif; font-size: 15px; -webkit-text-si=
ze-adjust: 100%; background-color: rgb(254, 254, 254);">-Bill</span><br id=3D=
"lineBreakAtBeginningOfSignature"><div dir=3D"ltr">Sent from my iPhone</div>=
</body></html>=

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