Spark plugs really matter?
#21
03-12-2009, 02:14 PM
^^^ Yeah I read something like that, too. The article I read showed a very small gain in performance and mpg...like fractions. Basically, not worth the effort unless you need every single bit out of your engine. I think I may try the Champions next time just to compare them to the Autolites, even though I have no complaints as of yet.
#22
03-12-2009, 03:17 PM
Legend
#24
03-12-2009, 03:21 PM
Legend
#25
03-12-2009, 03:53 PM
Bosch +2 & +4 are a poor design, I would never install a set. Nothing wrong with the Bosch plats.
Most important thing, make sure the cap/rotor are fresh, wires are good, routed correctly and the plugs are indexed. Any plug Ive ever installed in my Indy, Ive always indexed them. I found both the NGK and Champion the idle was rougher than with either the Bosch plats or Autolite coppers.
I had Bosch Plats in my bone stock 5.9, with bolt ons only, no power adder when it ran a 13.99 et.(Oct/01). Autolite 3923 coppers for the 12.91 et.(0ct/05)
Without indexing the plugs, any comparisons are useless IMHO.
Most important thing, make sure the cap/rotor are fresh, wires are good, routed correctly and the plugs are indexed. Any plug Ive ever installed in my Indy, Ive always indexed them. I found both the NGK and Champion the idle was rougher than with either the Bosch plats or Autolite coppers.
I had Bosch Plats in my bone stock 5.9, with bolt ons only, no power adder when it ran a 13.99 et.(Oct/01). Autolite 3923 coppers for the 12.91 et.(0ct/05)
Without indexing the plugs, any comparisons are useless IMHO.
#26
03-12-2009, 04:00 PM
Legend
#27
03-12-2009, 04:11 PM
Professional
#29
03-12-2009, 04:59 PM
Legend
#30
03-12-2009, 05:03 PM