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This is classic motor/generator stuff.=C2=A0 The primary difference betwee=
n a motor and a generator is the direction of power flow.=C2=A0 Put electri=
c power in, get rotation out you have a motor.=C2=A0 Put rotational energy =
in, get electricity out you have a generator.
What happens here is the fan acts as a motor most of the time but when you =
switch off the electric power goes away and the fan motor, being turned by =
the fan blades, becomes a generator until such time the fan slows enough th=
at the output voltage is too low to support the ignition coil.
If you find this annoying, the easy fix is to add a relay that is powered f=
rom the white wire and run power to the contacts from the brown wire.
=20
Dave=20
=20
=20
-----Original Message-----
From: Alex & Janet Thomson <aljlthomson@charter.net>
To: 'Jim Henningsen' <trguy75@gmail.com>; 'triumphs' <Triumphs@autox.team.n=
et>
Sent: Tue, Feb 26, 2019 7:08 pm
Subject: Re: [TR] TR4 engine question
Any chance that the coil is receiving a back feed from somewhere, after the
ignition switch is shut off? Maybe not a full 12 v but just enough to creat=
e
a weak spark?
Alex Thomson
-----Original Message-----
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Jim
Henningsen
Sent: Monday, February 25, 2019 8:29 PM
To: 'triumphs'
Subject: [TR] TR4 engine question
Fresh TR4 engine that does that "dieseling" thing after you turn off the
key.=C2=A0 It like it tries to keep running but with a cough and then stops=
.=C2=A0 The
TR6 has an anti-run on valve to help with that.=C2=A0 What do I treat on a =
TR4
motor?=C2=A0 P.S.=C2=A0 So proud that after 8 years putting my 4 back toget=
her stock,
I won first place in the sports car group at the AACC winter national.=C2=
=A0=20
Thanks
Jim Henningsen
Ocala, FL
61 TR3A
62 TR4
75 TR6
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e
sey@cs.com
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<font color=3D'black' size=3D'3' face=3D'Arial, Helvetica, sans-serif'>
<div> <font size=3D"3">This is classic motor/generator stuff. The pri=
mary difference between a motor and a generator is the direction of power f=
low. Put electric power in, get rotation out you have a motor. =
Put rotational energy in, get electricity out you have a generator.</font><=
/div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">What happens here is the fan acts as a motor most of =
the time but when you switch off the electric power goes away and the fan m=
otor, being turned by the fan blades, becomes a generator until such time t=
he fan slows enough that the output voltage is too low to support the ignit=
ion coil.</font></div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">If you find this annoying, the easy fix is to add a r=
elay that is powered from the white wire and run power to the contacts from=
the brown wire.</font><br>
</div>
<div> <br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Alex & Janet Thomson <aljlthomson@charter.net><br>
To: 'Jim Henningsen' <trguy75@gmail.com>; 'triumphs' <Triumphs@aut=
ox.team.net><br>
Sent: Tue, Feb 26, 2019 7:08 pm<br>
Subject: Re: [TR] TR4 engine question<br>
<br>
<div dir=3D"ltr">Any chance that the coil is receiving a back feed from som=
ewhere, after the<br clear=3D"none">ignition switch is shut off? Maybe not =
a full 12 v but just enough to create<br clear=3D"none">a weak spark?<br cl=
ear=3D"none"><br clear=3D"none">Alex Thomson<br clear=3D"none"><br clear=3D=
"none">-----Original Message-----<br clear=3D"none">From: Triumphs [mailto:=
<a shape=3D"rect" ymailto=3D"mailto:triumphs-bounces@autox.team.net"; rel=3D=
"noopener noreferrer" removedlink__c63fc553-1191-4df6-93da-cf81d7631376__hr=
ef=3D"mailto:triumphs-bounces@autox.team.net";>triumphs-bounces@autox.team.n=
et</a>] On Behalf Of Jim<br clear=3D"none">Henningsen<br clear=3D"none">Sen=
t: Monday, February 25, 2019 8:29 PM<br clear=3D"none">To: 'triumphs'<br cl=
ear=3D"none">Subject: [TR] TR4 engine question<br clear=3D"none"><br clear=
=3D"none">Fresh TR4 engine that does that "dieseling" thing after you turn =
off the<br clear=3D"none">key. It like it tries to keep running but w=
ith a cough and then stops. The<br clear=3D"none">TR6 has an anti-run=
on valve to help with that. What do I treat on a TR4<br clear=3D"non=
e">motor? P.S. So proud that after 8 years putting my 4 back to=
gether stock,<br clear=3D"none">I won first place in the sports car group a=
t the AACC winter national. <br clear=3D"none">Thanks<br clear=3D"non=
e">Jim Henningsen<br clear=3D"none">Ocala, FL<br clear=3D"none"><br clear=
=3D"none">61 TR3A<br clear=3D"none">62 TR4<br clear=3D"none">75 TR6<br clea=
r=3D"none"><br clear=3D"none"><br clear=3D"none"><br clear=3D"none">** <a s=
hape=3D"rect" ymailto=3D"mailto:triumphs@autox.team.net"; rel=3D"noopener no=
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:triumphs@autox.team.net">triumphs@autox.team.net</a> **<br clear=3D"none">=
<br clear=3D"none">Donate: <a shape=3D"rect" target=3D"_blank" rel=3D"noope=
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</font>
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