25 Do "Split Fire" (= name of a plug sold in the US, not a type of plug) plugs live up to their advertised claims?
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This article is from the VW Performance FAQ, by with numerous contributions by Jan Vandenbrande others.
25 Do "Split Fire" (= name of a plug sold in the US, not a type of plug) plugs live up to their advertised claims?
A:Responses from the net & tests by TT indicate: NO, they
are actually worse than the recommended Bosch plugs. Note
that VW recommends the use of tri- cathode Bosch plugs
for some of their cars...so this split-fire idea is
rather "old". Apparently it's covered with Techtonics
"Amazing Dyno Stories: Parts to get and parts to forget".
There's an article in the August 1994 issue of EC where
they talk about ignition systems and specialty spark
plugs. They interviewed Dr. Chris Jacobs of Jacobs
Electronics. The gist of the article is that, cars with
weak ignition systems get the most benifit form these
special spark plugs (SplitFire, V-groove, etc.) However,
the same cars perform better with stock plugs and an
improved ignition system than with the specialty plugs
and the stock system. [Ed's Note] Most newer VWs have a
pretty efficient ignition system, and may see little or
no benefit from such plugs or an enhanced ignition system
by Jacobs.
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