Improving performance of oem cop ignition coils - ClubLexus - Lexus Forum Discussion


LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Improving performance of oem cop ignition coils

Reply
 
 
 
Thread Tools Search this Thread
Old 10-22-17, 11:20 AM   #1
YODAONE
Lead Lap
Thread Starter
 
Join Date: Nov 2014
Location: CALIFORNIA
Posts: 659
Thanks: 0
Thanked 44 Times in 34 Posts
Default Improving performance of oem cop ignition coils

The COP (coil on plug) ignition coils on 1998-2000 LS400 reside atop 185- 200 F Aluminum valve cover which radiates heat onto and into these components and wiring.

Electronics perform more efficiently and last longer when not operating continuously at elevated temperatures .such as on top of a hot engine.

The wiring harness loom side plastic connector shells do not like such elevated temperatures either....each time it becomes necessary to disconnect a component connector I am confronted with replacing the connector shell.

Accordingly, in order to finish the work in one session, I plan ahead and order connector shells before disconnecting particular components.

All of the COP wire harness side connectors are brittle and have lost their locking tabs because they are cooking atop hot valve covers...

To Toyota's credit, these connectors are readily available...but the 1990-1994 LS400's used rubber shrouds over many of their engine bay connectors and work like new

So, it seems logical that insulating these 8 coils from direct engine heat will yield benefits in increased coil performance.and efficiency resulting from lower operating temperature...such as lower coil resistance...Side profile of right valve cover with COP. My guess is the valve cove triangle shaped ridge on right is deflect rising exhaust heat away from coils.
Top profile of the valve cover...Polishing the Aluminum cover would reduce surface area thus amount of radiated heat...
While it would also improve the appearance, not sure impact on engine cooling...


Another way is towards thermal management is to insulated the valve cover COP valley to block radiated heat from reaching the coils. Raw sample of DEI
Performance Products 3/16" heat barrier shown.


Another image depicting DEI heat barrier at bottom of coil valley. DEI's material incorporates 600 F high tack pressure sensitive adhesive... A single piece would easily be patterned to fit the entire valley.

bottom of valley has tapped bosses for mounting coils which are about 3/8" high so plently of space below coils.

DEI Heat Barrier Composite composition
YODAONE is offline   Reply With Quote
Old 10-22-17, 06:29 PM   #2
dicer
Lexus Champion
 
Join Date: Jul 2010
Location: wa
Posts: 4,176
Thanked 47 Times in 45 Posts
Default

Use coils mounted else where and in a cool location, and run good old wires to the plugs. I bet a place like MSD would have something.
dicer is offline   Reply With Quote
Old 10-22-17, 06:52 PM   #3
YODAONE
Lead Lap
Thread Starter
 
Join Date: Nov 2014
Location: CALIFORNIA
Posts: 659
Thanks: 0
Thanked 44 Times in 34 Posts
Default

Quote:
Originally Posted by dicer View Post
Use coils mounted else where and in a cool location, and run good old wires to the plugs. I bet a place like MSD would have something.
Now that is a project for another day, meanwhile am spending $10 for thermal insulating material that presents incremental improvement within the framework of the existing ignition system
YODAONE is offline   Reply With Quote
Old 10-23-17, 11:05 PM   #4
Losiracer2
Lead Lap
 
Losiracer2's Avatar
 
Join Date: Sep 2008
Location: Canton, MI
Posts: 437
Thanked 25 Times in 24 Posts
Default

how expensive are each one of those coils to replace if they go bad? It makes me glad that I have the older 97 model which uses two main coils in front w/ caps and rotors.
Losiracer2 is offline   Reply With Quote
Old 10-24-17, 06:40 AM   #5
YODAONE
Lead Lap
Thread Starter
 
Join Date: Nov 2014
Location: CALIFORNIA
Posts: 659
Thanks: 0
Thanked 44 Times in 34 Posts
Default

Quote:
Originally Posted by Losiracer2 View Post
how expensive are each one of those coils to replace if they go bad? It makes me glad that I have the older 97 model which uses two main coils in front w/ caps and rotors.
Not inexpensive but better, more consistent performance than rotorrs, caps, spark plug wires...which degrade through use and time
YODAONE is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
CA JDM Fenders & USDM Front bumper LXLUTHR 2Gen GS430 / 400/ 300 Classifieds (98-05) 6 11-09-17 03:36 PM
Replacing sub with Fogate P3 MikeFoxx LS - 3rd Gen (2001-2006) 6 10-23-17 10:23 AM
2006 LEXUS RX330 Ball Joint replacement w/o touch axle 5W40 RX - 2nd Gen (2004-2009) 0 10-22-17 10:16 PM
Ls400 ignition coil upgrades YODAONE LS - 1st and 2nd Gen (1990-2000) 10 11-17-15 10:45 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -7. The time now is 11:36 PM.


Copyright © 2000-2017 Internet Brands, Inc. All Rights Reserved We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: