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Tony, you might not be familiar with the 123 ignition dizzys, but they
recommend 1 ohm or greater- no worries on that.
Jason
On Sep 19, 2015 7:52 PM, "Anthony Rhodes" <spamiam@comcast.net> wrote:
> 1.5 ohm coils are typically used with a ballast resistor to make the
> overall resistance about 3 ohms except when starting the engine. A total
> resistance of less than 3 ohms may damage an electronic distributor
> switching unit unless it is specifically designed for low resistance coils.
>
>
> I think that some racing applications, particularly 8 cylinder engines may
> use a lower resistance ballast, or none at all. But at low revs like 2500
> on a 4-cly, the peak current is too high for points and the usual
> electronic distributor.
>
> -Tony
>
> Sent from my iPhone
>
> On Sep 19, 2015, at 2:45 PM, Jason Sukey <jsukey@gmail.com> wrote:
>
> I don't have all the specs on me at the moment, but from memory, the
> "hotter" red coil has a primary resistance of about 1.5 ohm, and the
> "colder" coil had a primary resistance of 3 or 3.5 ohm. My understanding
> is this is the typical situation where the lesser coil can't develop enough
> voltage at high rpm when the charge time is the shortest, thus needing the
> increased voltage of the lower resistance coil.
> Jason
> On Sep 19, 2015 2:35 PM, "Anthony Rhodes" <spamiam@comcast.net> wrote:
>
>> That is can interesting question of why one coil was failing at high RPM
>> while the other didn't.
>>
>> Assuming both are in proper operating condition, then I would expect that
>> the one that can't sustain high RPM has a lot more inductance than the one
>> that worked ok
>>
>> As a matter of fact, the "high voltage" coils probably get that extra
>> oomph by having higher inductance. The price you pay for high inductance
>> is that it takes longer to "charge" the magnetic field of the coil. So,
>> there is a steeper drop off of output voltage vs RPM.
>>
>> Do you have the specs on the two coils? Btw the resistance of the
>> secondary windings also has an influence. So does the resistance of the
>> primary windings though I am assuming both are 3 ohm.
>>
>> -Tony
>>
>> Sent from my iPhone
>>
>> > On Sep 19, 2015, at 1:00 PM, triumphs-request@autox.team.net wrote:
>> >
>> > Message: 1
>> > Date: Fri, 18 Sep 2015 14:26:04 -0400
>> > From: Jason Sukey <jsukey@gmail.com>
>> > To: auprichard@uprichard.net, triumphs@autox.team.net
>> > Subject: Re: [TR] TR3 coil question
>> > Message-ID:
>> > <CAMmo4o-UUO+VMFaKgUCjZiOEQHs1zfsV6fArUq9C+eKQ8s-Mzw@mail.gmail.com>
>> > Content-Type: text/plain; charset="utf-8"
>> >
>> > Andrew,
>> > Not TR3 related, but I've had to play around with coils on my
>> modified
>> > GT6 using the 123 distributor (USB tune model). After a lot of
>> fiddling, I
>> > found that with the recommended Bosch "blue" coil, it would "go flat" at
>> > high rpms when I was accelerating hard. (this is compared to points
>> dizzy
>> > with a hot coil).
>> > I ended up with the Bosch "red" coil (made in Brazil model, I'm told the
>> > made in Mexico version is of lesser quality). This solved my problems
>> and
>> > it once again is happy to pull strong up to 7,000 RPM's.
>> >
>> > My theory is that the lower voltage "Blue" coil is fine for stock
>> > applications, but isn't enough for higher performance use.
>> >
>> > Jason
>>
>
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<p dir=3D"ltr">Tony, you might not be familiar with the 123 ignition dizzys=
, but they recommend 1 ohm or greater- no worries on that.</p>
<p dir=3D"ltr">Jason</p>
<div class=3D"gmail_quote">On Sep 19, 2015 7:52 PM, "Anthony Rhodes&qu=
ot; <<a href=3D"mailto:spamiam@comcast.net";>spamiam@comcast.net</a>> =
wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"a=
uto"><div>1.5 ohm coils are typically used with a ballast resistor to make =
the overall resistance about 3 ohms except when starting the engine.=C2=A0 =
A total resistance of less than 3 ohms may damage an electronic distributor=
switching unit unless it is specifically designed for low resistance coils=
. =C2=A0</div><div><br></div><div>I think that some racing applications, pa=
rticularly 8 cylinder engines may use a lower resistance ballast, or none a=
t all.=C2=A0 But at low revs like 2500 on a 4-cly, the peak current is too =
high for points and the usual electronic distributor. =C2=A0</div><div><br>=
</div><div>-Tony<br><br>Sent from my iPhone</div><div><br>On Sep 19, 2015, =
at 2:45 PM, Jason Sukey <<a href=3D"mailto:jsukey@gmail.com"; target=3D"_=
blank">jsukey@gmail.com</a>> wrote:<br><br></div><blockquote type=3D"cit=
e"><div><p dir=3D"ltr">I don't have all the specs on me at the moment, =
but from memory, the "hotter" red coil has a primary resistance o=
f about 1.5 ohm, and the "colder" coil had a primary resistance o=
f 3 or 3.5 ohm.=C2=A0 My understanding is this is the typical situation whe=
re the lesser coil can't develop enough voltage at high rpm when the ch=
arge time is the shortest, thus needing the increased voltage of the lower =
resistance coil.<br>
Jason</p>
<div class=3D"gmail_quote">On Sep 19, 2015 2:35 PM, "Anthony Rhodes&qu=
ot; <<a href=3D"mailto:spamiam@comcast.net"; target=3D"_blank">spamiam@co=
mcast.net</a>> wrote:<br type=3D"attribution"><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:=
1ex">That is can interesting question of why one coil was failing at high R=
PM while the other didn't.<br>
<br>
Assuming both are in proper operating condition, then I would expect that t=
he one that can't sustain high RPM has a lot more inductance than the o=
ne that worked ok<br>
<br>
As a matter of fact, the "high voltage" coils probably get that e=
xtra oomph by having higher inductance.=C2=A0 The price you pay for high in=
ductance is that it takes longer to "charge" the magnetic field o=
f the coil.=C2=A0 So, there is a steeper drop off of output voltage vs RPM.=
<br>
<br>
Do you have the specs on the two coils?=C2=A0 Btw the resistance of the sec=
ondary windings also has an influence.=C2=A0 So does the resistance of the =
primary windings though I am assuming both are 3 ohm.<br>
<br>
-Tony<br>
<br>
Sent from my iPhone<br>
<br>
> On Sep 19, 2015, at 1:00 PM, <a href=3D"mailto:triumphs-request@autox.=
team.net" target=3D"_blank">triumphs-request@autox.team.net</a> wrote:<br>
><br>
> Message: 1<br>
> Date: Fri, 18 Sep 2015 14:26:04 -0400<br>
> From: Jason Sukey <<a href=3D"mailto:jsukey@gmail.com"; target=3D"_b=
lank">jsukey@gmail.com</a>><br>
> To: <a href=3D"mailto:auprichard@uprichard.net"; target=3D"_blank">aupr=
ichard@uprichard.net</a>, <a href=3D"mailto:triumphs@autox.team.net"; target=
=3D"_blank">triumphs@autox.team.net</a><br>
> Subject: Re: [TR] TR3 coil question<br>
> Message-ID:<br>
>=C2=A0 =C2=A0 <<a href=3D"mailto:CAMmo4o-UUO%2BVMFaKgUCjZiOEQHs1zfsV=
6fArUq9C%2BeKQ8s-Mzw@mail.gmail.com" target=3D"_blank">CAMmo4o-UUO+VMFaKgUC=
jZiOEQHs1zfsV6fArUq9C+eKQ8s-Mzw@mail.gmail.com</a>><br>
> Content-Type: text/plain; charset=3D"utf-8"<br>
><br>
> Andrew,<br>
>=C2=A0 =C2=A0 Not TR3 related, but I've had to play around with coi=
ls on my modified<br>
> GT6 using the 123 distributor (USB tune model).=C2=A0 After a lot of f=
iddling, I<br>
> found that with the recommended Bosch "blue" coil, it would =
"go flat" at<br>
> high rpms when I was accelerating hard.=C2=A0 (this is compared to poi=
nts dizzy<br>
> with a hot coil).<br>
> I ended up with the Bosch "red" coil (made in Brazil model, =
I'm told the<br>
> made in Mexico version is of lesser quality).=C2=A0 This solved my pro=
blems and<br>
> it once again is happy to pull strong up to 7,000 RPM's.<br>
><br>
> My theory is that the lower voltage "Blue" coil is fine for =
stock<br>
> applications, but isn't enough for higher performance use.<br>
><br>
> Jason<br>
</blockquote></div>
</div></blockquote></div></blockquote></div>
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