Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 08-16-2007, 02:39 PM
CN Spots's Avatar
CN Spots CN Spots is offline
Senior User
 
Join Date: Apr 2006
Location: NW Mississippi
Posts: 403
CN Spots is starting off with a positive reputation.
What spark plug gap for a modified FE?

Ok, say you've just hot rodded your big honkin 390. New cam, pistons, intake, carb... the works. Now you need to gap your spark plugs -but with all of the mods, what do you do? Set them to stock or is there a formula to account for performance enhancements? What I've read indicates using a cooler plug and tighter gap for higher compression but as to how cool and how tight is left up to the individual via best guess. I can't help but think that there's a better way... Thoughts?



spots
Reply With Quote
  #2  
Old 08-16-2007, 04:22 PM
Redmanbob's Avatar
Redmanbob Redmanbob is offline
Postmaster
 
Join Date: Oct 2005
Location: Mddl A MexCans
Posts: 3,770
Redmanbob is gaining momentum as a positive member of FTE.Redmanbob is gaining momentum as a positive member of FTE.
.035 if the brain still works.. kind of depends on your setup too though.(HO ignition?)
__________________
66 F100 352FE / Cruiso
71 F250 360FE /C6
CRATE = Cant Really Appreciate The Engine..
Reply With Quote
  #3  
Old 08-16-2007, 07:21 PM
dffay dffay is offline
Elder User
 
Join Date: Dec 2003
Location: New Mexico
Posts: 531
dffay is starting off with a positive reputation.
I think with electronic ignition, one can get away with a larger gap--like up to .050 or more. The tech-line of the distributor manufacturer--if you changed to one--might be helpful.
Reply With Quote
  #4  
Old 08-16-2007, 10:36 PM
CN Spots's Avatar
CN Spots CN Spots is offline
Senior User
 
Join Date: Apr 2006
Location: NW Mississippi
Posts: 403
CN Spots is starting off with a positive reputation.
Crane Electronic conversion but everything else is stock.


Should a compression increase (9.5) be taken into consideration?
Reply With Quote
  #5  
Old 08-17-2007, 10:50 AM
FalconStng FalconStng is offline
Elder User
 
Join Date: Feb 2005
Posts: 669
FalconStng is starting off with a positive reputation.
The gap that you can run is really decided by the ignition system you have. As a general rule, you're .035 for a stock points/coil system. If you're got an electronic ignition then usually you've got a hotter coil and should gap the spark plugs wider. The are several crane conversions. If you've got the xri and you're running a stock coil then .035.

Good Luck

Tracy
Reply With Quote
  #6  
Old 08-17-2007, 03:57 PM
PerfDistIgnition PerfDistIgnition is online now
FTE Sponsor
 
Join Date: Aug 2006
Posts: 751
PerfDistIgnition is starting off with a positive reputation.
Quote:
Originally Posted by CN Spots
Ok, say you've just hot rodded your big honkin 390. New cam, pistons, intake, carb... the works. Now you need to gap your spark plugs -but with all of the mods, what do you do? Set them to stock or is there a formula to account for performance enhancements? What I've read indicates using a cooler plug and tighter gap for higher compression but as to how cool and how tight is left up to the individual via best guess. I can't help but think that there's a better way... Thoughts?



spots
Use a smaller gap when running a stock ignition coil & module with a high compression motor, .035"-.040".

However, if you go to a performance igntion system which is strong enough, you can open up your gaps wider, which burns your fuel more completely-usually .050" to .055".

If you decide to get a new distributor, consider our custom curved Duraspark Distributor built with our new Full Length Oil Impregnated Bronze Bushing. The full length bushing improves timing stability and spark scatter. If stock appearance is not an issue, take a look at our one piece D.U.I. Distributor. Whether you choose the Duraspark or the D.U.I., we curve each on a distributor machine based on your engine combination. Please see them at:

http://www.performancedistributors.c...stributors.htm

Also, there is now an excellent installation article on the D.U.I. Distributor on the Ford-Trucks.com site at:


http://www.ford-trucks.com/article/idx/0/358/article/DUI_Ignition_Installation_In_A_Ford_351W_V8.html


Speaking of wider plug gaps, we have recently developed the 18 Volt Mini-V.I.P.-(Voltage Intensive Power) step-up regulator that can be ran with our D.U.I. Distributor. It allows you to run a .070" plug gap! Of course, with this kind of spark, you can run a richer fuel mixture, making more power.

http://www.performancedistributors.com/new.htm
__________________
FTE Sponsor
Performance Distributors
www.PerformanceDistributors.com
Reply With Quote
Old 08-17-2007, 03:57 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
how to determined gap RIKIL Performance & General Engine Building 6 12-15-2014 03:34 AM
Gapping Birdman_7137 1967 - 1972 F-100 & Larger F-Series Trucks 1 06-01-2013 12:34 AM
Spark plugs for HEI conversion, need bigger gap ClatonK Performance & General Engine Building 6 03-08-2007 08:48 PM
Spark Plug Gap TN Hillbilly 1999 - 2003 7.3L Power Stroke Diesel 24 12-25-2004 11:59 AM
97 exp spark plug gap atl Explorer, Sport Trac, Mountaineer & Aviator 2 06-27-2003 12:45 PM


Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)

Tags
352, 360, duraspark, electronic, engine, fe, ford, gap, gaps, ignition, motor, plug, plugs, spark, troubleshooting, type

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 04:55 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup