Spark plug reccomendation please.
Thread Starter
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
Spark plug reccomendation please.
I have always liked Autolite plugs. I use them in my L98, Honda, truck (Olds 425 ), Jimmy and my lawnmower. I have tried so many brands and have had the best luck with Autolite for performance. I tried platinum and didn't like them. So I think I am going to try the Autolite 106 plugs in my LT4. Any thoughts or suggestions?
Thanks,
Thanks,
Instructor
Joined: Mar 2004
Posts: 114
Likes: 0
Re: Spark plug reccomendation please. (VAHROOM)
I just replaced my stock AC Delco's for Bosch Platinums... don't know much about long term use but it sure made a difference when I first started the Vette up!!! :smash: :reddevil
Drifting
Joined: Nov 2002
Posts: 1,365
Likes: 3
From: Huntsville AL
Re: Spark plug reccomendation please. (VAHROOM)
Here's my personal experience.
I replaced the original plugs and wires at 37k miles. I put in AC Delco Rapidfire #14, a single platinum plug, and Taylor 8mm Sprio Pro wires. Car ran better than it did before (original plugs were all missing their platinum pucks), but still felt a little rough. And for the last 6 months I've been fighting a high rpm vibration which may or may not be ignition related. So a couple of weeks ago, I pulled the Rapidfires and replaced with NGK TR55 copper plugs. Still running a little rough, still has the vibration. Now I am going to order Delco wires and the stock 41-906 Delco double platinum plugs and return the ignition system to stock. Every mechanic that has looked at the car told me to put the stock platinum plugs back in it; that's what the opti spark and computer were designed to operate with.
So after I do that, I'll let you know how the car runs and if it solves my vibration problem.
I'd just stick with OE stuff if it were me, especially if it's running good with the stock setup now.
I replaced the original plugs and wires at 37k miles. I put in AC Delco Rapidfire #14, a single platinum plug, and Taylor 8mm Sprio Pro wires. Car ran better than it did before (original plugs were all missing their platinum pucks), but still felt a little rough. And for the last 6 months I've been fighting a high rpm vibration which may or may not be ignition related. So a couple of weeks ago, I pulled the Rapidfires and replaced with NGK TR55 copper plugs. Still running a little rough, still has the vibration. Now I am going to order Delco wires and the stock 41-906 Delco double platinum plugs and return the ignition system to stock. Every mechanic that has looked at the car told me to put the stock platinum plugs back in it; that's what the opti spark and computer were designed to operate with.
So after I do that, I'll let you know how the car runs and if it solves my vibration problem.
I'd just stick with OE stuff if it were me, especially if it's running good with the stock setup now.
Drifting
Joined: Oct 2003
Posts: 1,594
Likes: 0
From: CALGARY ab
Re: Spark plug reccomendation please. (dan85vette)
I just replaced my stock AC Delco's for Bosch Platinums... don't know much about long term use but it sure made a difference when I first started the Vette up!!! :smash: :reddevil
Instructor
Joined: Mar 2004
Posts: 116
Likes: 3
From: Knee deep in Amish PA
Re: Spark plug reccomendation please. (Red_Vette_93)
People that say changing the battery is PITA, have never changed the plugs!!
I think thats all I'm say about that :lol: Good luck!!!
BTW, I have Bosch plat. +2's in my LT1. Much better idle and a little power gain. Recommended!! :thumbs:
[Modified by CorvetteClug, 6:59 PM 3/18/2004]
I think thats all I'm say about that :lol: Good luck!!!
BTW, I have Bosch plat. +2's in my LT1. Much better idle and a little power gain. Recommended!! :thumbs:
[Modified by CorvetteClug, 6:59 PM 3/18/2004]
Pro
Joined: Apr 2002
Posts: 605
Likes: 0
From: Outer Banks NC FIRST IN FLIGHT
Re: Spark plug reccomendation please. (Red_Vette_93)
just a quick question, I have a 1993 LT1 & I was curious as to how hard it is to replace the plugs? Do you have to go thru the wheel wells?
I have the Bosch platium +4's I have had great results with them, better idle and at least 2 mpg. increase. I also changed out my stock wires for Moroso 8mm blues. My car runs great.
Thread Starter
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
Re: Spark plug reccomendation please. (VAHROOM)
I guess I should have asked whether any one had tried Autolite 106 plugs. I can't care about logevity. I want a good performing plug that works well in a modified LT4. I think I will try them and post results.
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Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Re: Spark plug reccomendation please. (VAHROOM)
I recomend NGK TR55IX (Iridium) plugs. I wouldn't use the AC Delco Professional Platinum Plugs as the pucks can come off and leave you with a huge gap and a lousy running engine.
Hey Hammer, If your vibration is in the 3000-5500 rpm range, it might not be an ignition problem but a balance problem.
Hey Hammer, If your vibration is in the 3000-5500 rpm range, it might not be an ignition problem but a balance problem.
Drifting
Joined: Nov 2002
Posts: 1,365
Likes: 3
From: Huntsville AL
Re: Spark plug reccomendation please. (Strick)
Hey Hammer, If your vibration is in the 3000-5500 rpm range, it might not be an ignition problem but a balance problem.
Read this http://forums.corvetteforum.com/zerothread?id=778380
Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Re: Spark plug reccomendation please. (HammerDown)
Hey Hammer, If your vibration is in the 3000-5500 rpm range, it might not be an ignition problem but a balance problem.
Yes, definitely.
Read this http://forums.corvetteforum.com/zerothread?id=778380
Yes, definitely.
Read this http://forums.corvetteforum.com/zerothread?id=778380
Sorry for the hi jack.
Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Re: Spark plug reccomendation please. (VAHROOM)
[QUOTE]Actually I have NGK's in there right now. Just looking for that extra little bit.QUOTE]
You have the Iridiums and you want more? I don't think you'll get too much more from a plug.
You have the Iridiums and you want more? I don't think you'll get too much more from a plug.
Drifting
Joined: Nov 2002
Posts: 1,365
Likes: 3
From: Huntsville AL
Re: Spark plug reccomendation please. (Strick)
I agree with Strick.
If your engine is running fine, no missing, no vibration LEAVE IT ALONE!
You will not gain any, let me repeat, ANY, horsepower from different spark plugs, unless the ones that are in there are bad.
If your engine is running fine, no missing, no vibration LEAVE IT ALONE!
You will not gain any, let me repeat, ANY, horsepower from different spark plugs, unless the ones that are in there are bad.
Drifting
Joined: Nov 2002
Posts: 1,365
Likes: 3
From: Huntsville AL
Re: Spark plug reccomendation please. (Strick)
Hey Hammer, If your vibration is in the 3000-5500 rpm range, it might not be an ignition problem but a balance problem.
Yes, definitely.
Read this http://forums.corvetteforum.com/zerothread?id=778380
Well, what did the tranny shop find? There is a measurement to check on the dual mass flywheel. It's in the Helms Service Manual which all Vette owners should have. If that measurement is excessive, you have to replace the dual mass.
Sorry for the hi jack.
Yes, definitely.
Read this http://forums.corvetteforum.com/zerothread?id=778380
Well, what did the tranny shop find? There is a measurement to check on the dual mass flywheel. It's in the Helms Service Manual which all Vette owners should have. If that measurement is excessive, you have to replace the dual mass.
Sorry for the hi jack.
Today in the parking lot at work, I let the car idle with the clutch out and tranny in neutral. Not a sound. I cycled the clutch pedal several times to see if I could induce a noise. Nothing. Now, if I slowly bring the rpms up, say above 2000, I start getting more racket, but I think this is just normal ZF noise. Anyway, if the throwout bearing is as floppy as he says it is, wouldn't it be making noise all the time, no matter what I do?
I think we just hi-jacked the thread. :leaving:
Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Re: Spark plug reccomendation please. (HammerDown)
Hammer, The throw out bearing is different than most throw out bearings in that it pulls on the clutch instead of pushing. There is a spring clip that holds the bearing in place while you install the clutch. Once installed that spring really doesn't do much. Maybe it came loose. I wish you had a Helms Service Manual for your year Vette. It has all the pictures and diagrams that makes this easier to understand. I just replaced my clutch and flywheel, learned a lot about our set up, but it is different from most. Once he takes the clutch off, have him measure the distance the rear plane of the dual mass will rotate without the front plane moving. The max distance is 35mm or 1.378in. If he looks at you kinda funny, he probably needs to learn about this unique flywheel (Helms Service Manual)
Racer
Joined: Nov 2002
Posts: 478
Likes: 0
From: langhorne
Re: Spark plug reccomendation please. (HammerDown)
I agree with Strick.
If your engine is running fine, no missing, no vibration LEAVE IT ALONE!
You will not gain any, let me repeat, ANY, horsepower from different spark plugs, unless the ones that are in there are bad.
If your engine is running fine, no missing, no vibration LEAVE IT ALONE!
You will not gain any, let me repeat, ANY, horsepower from different spark plugs, unless the ones that are in there are bad.
[Modified by Gar, 9:47 PM 3/18/2004]
Thread Starter
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
Re: Spark plug reccomendation please. (Strick)
I guess I am "testadura". Italian for hardhead. I had NGK Platinums in a Samurai and my performance and fuel economy dropped by 10% or more. I realize a built LT4 and a 1300cc import engine are a little different to say the least. I still want to try them this weekend. I will report any performance gains (even if it is all in my hard head). Thank you all for the help. I really mean that.
[Modified by VAHROOM, 9:51 PM 3/18/2004]
[Modified by VAHROOM, 9:51 PM 3/18/2004]
Le Mans Master
Joined: May 2003
Posts: 5,203
Likes: 0
From: Las Vegas Nevada
Re: Spark plug reccomendation please. (HammerDown)
Hammer, have you looked elsewhere for you vibes...That dosent sound ingition relatied to me. A good place to look is the tensioner pulley. They dont last forever. My self destructed and ruined my AC compressor.
I ignored the vibration.
:nonod:
I ignored the vibration.
:nonod: