Go Back   EcoModder Forum > EcoModding > DIY / How-to
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-14-2012, 12:07 AM   #1 (permalink)
EcoModding Lurker
 
Join Date: Apr 2011
Location: Waterloo, IL
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
The best spark plug

I have a a 2002 Ford Focus ZX3 w/ 185k on it. What do you guys think is the best spark plug for it. Has anybody tried those max comp spark plugs?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 08-14-2012, 01:39 PM   #2 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,517 Times in 1,120 Posts
...if you have FUEL ECONOMY in mind, a set of OEM iridium plugs gapped slightly wider than spec is preferred; but, if you're after POWER, a fresh set of "colder" copper-core plugs, gapped somewhat narrower than spec, is better.
  Reply With Quote
Old 10-20-2012, 09:09 PM   #3 (permalink)
EcoModding Alien Observer
 
suspectnumber961's Avatar
 
Join Date: Mar 2008
Location: I flitter here and there
Posts: 547

highcountryexplorer - '86 Nissan 720 KC 4x4 ST with fiberglass cap
90 day: 21.78 mpg (US)

Elroy - '03 Ford Focus ZX3 w/Zetec DOHC engine
90 day: 32.89 mpg (US)
Thanks: 6
Thanked 78 Times in 65 Posts
I've had good luck with some Autolite double plats...will be trying E3s eventually.
__________________
Carry on humans...we are extremely proud of you. ..................

Forty-six percent of Americans believe in the creationist view that God created humans in their present form at one time within the last 10,000 years. GALLUP POLL
  Reply With Quote
Old 10-21-2012, 02:46 AM   #4 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 6,876
Thanks: 0
Thanked 687 Times in 608 Posts
I like Bosch spark plugs more than any other.
  Reply With Quote
Old 10-21-2012, 01:13 PM   #5 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,517 Times in 1,120 Posts
FWIW, E3's only seem to be "effective" in the older, carburetted engines, and "not so" much better in the newer, injected engines.

Last edited by gone-ot; 10-21-2012 at 08:38 PM..
  Reply With Quote
Old 10-21-2012, 04:02 PM   #6 (permalink)
Master EcoModder
 
Join Date: May 2012
Location: Indiana
Posts: 1,411

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 40.81 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 124.7 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
90 day: 21.48 mpg (US)
Thanks: 137
Thanked 300 Times in 205 Posts
I prefer ngk platinums.
__________________




  Reply With Quote
Old 11-11-2012, 01:47 AM   #7 (permalink)
Your car looks ridiculous
 
Join Date: Jul 2012
Location: Northern California
Posts: 96

The Fantastic Festiva - '90 Ford Festiva L
90 day: 43.16 mpg (US)

A Civic Duty - '96 Honda Civic LX
90 day: 34.9 mpg (US)

Ranger Danger - '96 Ford Ranger XL
90 day: 17.42 mpg (US)
Thanks: 23
Thanked 5 Times in 4 Posts
I've heard of racers gapping spark plugs narrower to eek out a few horsepower. But why would a wider spark plug gap increase fuel economy?

Quote:
Originally Posted by Old Tele man View Post
...if you have FUEL ECONOMY in mind, a set of OEM iridium plugs gapped slightly wider than spec is preferred; but, if you're after POWER, a fresh set of "colder" copper-core plugs, gapped somewhat narrower than spec, is better.
  Reply With Quote
Old 11-11-2012, 10:29 AM   #8 (permalink)
EcoModding Lurker
 
Join Date: Oct 2012
Location: muskoka
Posts: 80

Speedy Gonzales - '11 Ford Fiesta SES
Thanks: 7
Thanked 10 Times in 6 Posts
And wider gap would MAYBE decrease spark strength...but with a longer spark, you're likely to ignite the mixture more reliably...

I think power and economy go hand in hand...If you can make more power, your engine is running more efficiently, and more efficiently, we'll....

I run copper plugs in my SVT with a slightly bigger gap. Ford coils are good and strong and can handle the extra gap.
Copper is a better conductor than all those rare metals...but wears faster.
Iridium is designed for long plug life, and are not the best electrical conductor.
__________________

  Reply With Quote
The Following User Says Thank You to wungun For This Useful Post:
AaronMartinSole (11-11-2012)
Old 11-11-2012, 01:39 PM   #9 (permalink)
Master EcoModder
 
Join Date: Jan 2012
Location: United States
Posts: 1,253

spyder2 - '00 Toyota MR2 Spyder
Thanks: 77
Thanked 204 Times in 152 Posts
A wider gap igniting the mixture more reliably? That seems odd, a wider gap reduces arc intensity, and since the electric field is weaker as the plug gets old perhaps or something, the spark would not be as reliable.
  Reply With Quote
Old 11-11-2012, 01:39 PM   #10 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,517 Times in 1,120 Posts
wungun nailed the answers.

A wider gap increases the arc LENGTH (and thus AREA) within the A/F mixture between the electrodes, which provides better 'chance' of ignition of lean A/F mixtures which are often NOT easy to ignite--it's called increased "probability of ignition"--the difference in probability between a single-bullet and a shotgun-blast "hitting" the bullseye center of a target.

A narrower gap decreases the arc LENGTH in favor of a slightly HOTTER and LONGER arc duration, but assumes the A/F is always rich-enough to ignite easily.


Last edited by gone-ot; 11-11-2012 at 01:53 PM..
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com