[TR] TR4 engine question

[DAVID MASSEY]

 This is classic motor/generator stuff.  The primary difference between a motor and a generator is the direction of power flow.  Put electric power in, get rotation out you have a motor.  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 that 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 from the white wire and run power to the contacts from the brown wire.
 
Dave 

 
 
-----Original Message-----
From: Alex & Janet Thomson <aljlthomson at charter.net>
To: 'Jim Henningsen' <trguy75 at gmail.com>; 'triumphs' <Triumphs at autox.team.net>
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 create
a weak spark?

Alex Thomson

-----Original Message-----
From: Triumphs [mailto:triumphs-bounces at 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.  It like it tries to keep running but with a cough and then stops.  The
TR6 has an anti-run on valve to help with that.  What do I treat on a TR4
motor?  P.S.  So proud that after 8 years putting my 4 back together stock,
I won first place in the sports car group at the AACC winter national.  
Thanks
Jim Henningsen
Ocala, FL

61 TR3A
62 TR4
75 TR6



** triumphs at autox.team.net **

Donate: http://www.team.net/donate.html
Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

Unsubscribe/Manage:
http://autox.team.net/mailman/options/triumphs/aljlthomson@charter.net

** triumphs at autox.team.net **

Donate: http://www.team.net/donate.html
Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/dave1massey@cs.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/triumphs/attachments/20190227/aa6b484c/attachment.html>