Kent 1600 Xflow Engine runaway - LotusTalk - The Lotus Cars Community
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 10-16-2014, 09:41 AM Thread Starter
Registered User
 
Join Date: Oct 2014
Posts: 3
Kent 1600 Xflow Engine runaway

Hi,

Was helping a buddy time his engine so we set it at fast idle and did our stuff. Long story short, when it was time to shut the engine off (after running for about 20? minutes - thermofan had kicked in), it wouldn't. Ignition was off, killswitch was hot, engine still ran. Not dieseling, either - it never missed a beat from when the ignition switch was on and killswitch was cold. Here's the kicker - disconnected battery negative (ground) terminal.....and it still ran.

Checked the generic Westfield wiring diagram and I was thinking: could the alternator somehow have kept supplying juice to the coil? Because pulling one of the coil leads (I never got to see which one) was the only thing that killed it.

Since this is going the be an AutoX car, this condition could have serious track consequences. Anyone ever had anything like this before? If not, anyone out there with a guess?

Thanks in advance,
MR2
mister22u is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 10-16-2014, 10:18 AM
Registered User
 
TedR's Avatar
 
Join Date: Jun 2005
Location: Oregon
Posts: 854
The alternator can keep the engine running without the battery.

Sounds like it is time to start diagnosing with a multimeter. Start at the coil where you know it stayed hot and work back. My guess is the ignition switch has a short.
TedR is offline  
post #3 of 6 (permalink) Old 10-16-2014, 10:21 AM
Registered User
 
LiveToDrive's Avatar
 
Join Date: Nov 2012
Location: Alta Loma, CA
Posts: 956
Can I ask where you are located? I'm looking to build a Kent 1600 xflow myself, but here in SoCal I don't know any shops familiar with the engine.
LiveToDrive is offline  
 
post #4 of 6 (permalink) Old 10-16-2014, 06:45 PM Thread Starter
Registered User
 
Join Date: Oct 2014
Posts: 3
Tucson, AZ
mister22u is offline  
post #5 of 6 (permalink) Old 10-16-2014, 06:51 PM Thread Starter
Registered User
 
Join Date: Oct 2014
Posts: 3
Quote:
My guess is the ignition switch has a short.
Thanks for the suggestion. We'll certainly look at the ignition switch.
mister22u is offline  
post #6 of 6 (permalink) Old 10-17-2014, 05:55 PM
Registered User
 
Join Date: Jun 2009
Location: Toronto, Ontario, Canada
Posts: 935
re: Engine running without battery

Have to disconnect battery and do any or all of the above:

1. Disconnect the alternator, completely. that is why some racing kill switches have 2 connectors, battery and alternator.

2. Ground alternator excitation field (stops alternator from making electricity, also).

3. Disconnect ignition low tension side, via relay or otherwise.

Alternator will run the motor without battery, which in turn will spin and run the alternator! Connecting alternator and battery on the same side of single pole kill switch creates a nasty DC feedback through the alternator and reverse polarity on all your electrical components.... In other words, singel pole switches are for guys running batteries with no alternator.

Anton
ageshelin is offline  
Sponsored Links
Advertisement
 
Reply

  LotusTalk - The Lotus Cars Community > Lotus Discussions > Lotus Inspired Cars or Cars with Lotus DNA

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the LotusTalk - The Lotus Cars Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome