I replaced my plugs with Denso IK20 Iridium plugs and it fixed everything. Famous last words...These I found out after the purchase don't last long. What do you suggest I replace these with?Better view would include the porcelain insulator too, also perhaps take the picture in sunlight. Regarding the Autolites, I used them for a while in our AEB, had no complaints, but later changed back to the fine-wire OE type.
The spark plugs play only a teenie part in controlling the combustion chamber temperature. The chamber's aluminum surface, and the valve seats, are what conducts heat to the coolant. Saying that a spark plug is "colder" or "hotter" than another refers to how well heat is conducted from the porcelain insulator to the metal shell of the plug.The F6DTC is one heat range colder than stock...not recommended unless you are chipped and have a need to get excess heat out of the combustion chamber. (Copper conducts heat better than Platinum, btw)
That's not true. The spark only happens at the edge of the electrode anyway; it does not occur over the entire surface. And the size of the spark has to do with the amount of current, not the size of the electrode.Also with copper plugs the electrode is bigger so a fatter spark
Thanks for that. I'm thinking they don't put the "Hidden unadjustable gap" in the electrode halfway down the ceramic on those NGK PFR6Q?OE plug is NGK PFR6Q I believe, but not cheap ($11.60 each at autohausaz.com where I get most maintenance things). But they outlast standard plugs by many times, to around 100K miles or more depending on use.
Cruise control: on early Passats that's a vacuum-actuated system, with a notoriously faulty control module, but other weak links exist.
The octane boosters usually mention "points" by which it boosts the octane, which each point is 0.1 octane. So if you had 8 pts octane booster that was added to 87 fuel, it would only be 87.8. :icon_eek:This is true. Went to AZ, Regular gas was 0.50c cheaper than premium. Bought octain booster for $1.99. Save $7. Think these plugs are good for this engine?