Are Denso spark plugs better than NGKs?
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Are Denso spark plugs better than NGKs?
I've been thinking about going to some Iridium plugs so I can change my plugs once and not have to worry about them again for a long time, and it looks like Denso and NGK make the best ones out there.
I've heard that Denso plugs are the "best in the world," but the thin 0.4 mm electrode can supposedly wear out quicker than the 0.6 mm electrode used on the NGK, so the NGK will theoretically last a lot longer (one of the characteristics I'm looking for besides good performance). And I wonder if the AC Delco Iridium plug is any good...
I don't really care about cost, and I know the NGK TR55 is the preferred plug on this site, but I'd like to know which Iridium plug is really the best. And what about Web sites where there's scientific testing of spark plugs, and not just testimonials like "I've always used Acme plugs and never had a problem..."
I've heard that Denso plugs are the "best in the world," but the thin 0.4 mm electrode can supposedly wear out quicker than the 0.6 mm electrode used on the NGK, so the NGK will theoretically last a lot longer (one of the characteristics I'm looking for besides good performance). And I wonder if the AC Delco Iridium plug is any good...
I don't really care about cost, and I know the NGK TR55 is the preferred plug on this site, but I'd like to know which Iridium plug is really the best. And what about Web sites where there's scientific testing of spark plugs, and not just testimonials like "I've always used Acme plugs and never had a problem..."
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I was just checking the fitment charts and it looks like NGK doesn't have an Iridium plug recommended for the '99 LS1, but Denso and AC Delco do. NGK specifies the "Laser Platinum PZTR5A-15" for my LS1, but they show no Iridium equivalent. What's up with that?
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Originally Posted by Hank Hill
I was just checking the fitment charts and it looks like NGK doesn't have an Iridium plug recommended for the '99 LS1, but Denso and AC Delco do. NGK specifies the "Laser Platinum PZTR5A-15" for my LS1, but they show no Iridium equivalent. What's up with that?
Last edited by lerajie; 01-22-2004 at 12:47 PM.
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Originally Posted by Ferocity02
Dyno numbers? I difference would be minimal, fraction of a horsepower at the most. The differences are mainly in lifespan and gaps, different gaps for F/I, N/A and N20 and what not.
Unless you are going to a bad set to a new set.