08-18-2005 | #1 |
Join Date: Jul 2005
Location: Auburn, Washington
Posts: 586
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LT5 Spark Plugs
What spark plugs are you guys running? My lightly modified LT5 runs very well on the GM specified AC Delco 41-913's. I recently tried a set of Rapidfire #5's and I'm having some problems with detonation. I think the plug's heat range is too hot, so I'm going to try a set of Autolite double platinums, for no other reason than availability and price ($4 apiece versus $10 apiece for the AC Delco 41-913's).
My research indicates that the Rapidfire #5 will work, if you start the engine and don't warm it up before driving, and if you do not drive it aggressively. Anybody here fit that criteria? I also understand that the Rapidfire #9's might work better. Comments?
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Nick ZR-1 Net Registry Founding Member #32 - lapsed... |
08-18-2005 | #2 |
Join Date: Feb 2004
Location: Ma
Posts: 404
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Nick, I'm currently running the colder of the rapid fire plugs. I get some hesitation, especially when the car isn't completely warmed up. Mark Haibeck said that the rapid fires are known to cause that problem and recommended the NGK TR7IX Iridium. I ordered a set and then realized that they are a tapered seat, and having a 1990, I would have to do the over torque thing. I'm still on the fence about whether or not to do it so I can't tell you if they made an improvement.
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1990 ZR1 #2574 Medium Quasar Blue Metallic 1 of 19 |
08-18-2005 | #3 |
Join Date: Feb 2004
Location: Aurora, IL
Posts: 309
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NGK Plugs ROCK! I have never heard anything bad about them I have a friend that has them in his Firebird and loves them, I plan on putting them in my car when its time. as for the rapidfire plugs I have not heard anything good on them.
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-Shaun 1991 Charcoal Metallic ZR1 #730 [URL="http://www.cardomain.com/ride/2649606"]http://www.cardomain.com/ride/2649606[/URL] [URL="http://community.webshots.com/user/shaun91zr1"][/URL] [IMG]http://img.photobucket.com/albums/v211/RiceEatingZR1/Forum%20Sig/Sig1.gif[/IMG] |
08-19-2005 | #4 |
Join Date: Jul 2005
Location: Auburn, Washington
Posts: 586
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UPDATE.
Installed the Autolite double platinums last night, in stock heat range. Car runs fabulous. No detonation and coolant temps lowered slightly. Its nice having my ZR-1 back again!
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Nick ZR-1 Net Registry Founding Member #32 - lapsed... |
08-23-2005 | #5 |
Join Date: Aug 2005
Location: NY
Posts: 143
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Good to here your car is running well again.
I use splitfire plugs without any problems.
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Mike 427 cu in LT5 [URL="http://zr1mk.weebly.com"]http://zr1mk.weebly.com[/URL] |
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