Hi I was wondering what the majority of you were using for spark plugs with your 3800 s/c engines? I am going to be running a 3.4 pulley and a cam with some mild porting and true duals.
I switched to the iridium NGK tr6 plugs in my car but haven't had nice enough weather to test them out. Im curious if anyone has an opinion on them who has actual experience with them. Dave
The XP103's I run are Iridium. I was having either blow out or quenching problems with the AR103's at over 20psi. I put the XP's in gaped at .025 and haven't had a problem since.
The XP103's I run are Iridium. I was having either blow out or quenching problems with the AR103's at over 20psi. I put the XP's in gaped at .025 and haven't had a problem since.
really? I wanted to run the iridium plugs but I have heard that people have had issues with the engine not running properly so I kind of gave up on the idea. Maybe I will try my luck with them. Maybe the wider gap was causing the issue they were having.
The XP103's I run are Iridium. I was having either blow out or quenching problems with the AR103's at over 20psi. I put the XP's in gaped at .025 and haven't had a problem since.
Justin....Thanks. Good to know. I was always told to not touch the gap on the iridium plugs as the tip may become damaged, but that may have been on the early ones that BMW and Mercedes used about 10 years ago. I added them to my car to see if it helps with the meth. I tried the TR7ix in Charlie's car (the ultimate car buildoff) due to the blower being very close to being maxed out. I figure that would be a good car to experiment with them.
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Originally posted by fieroaddicted:
really? I wanted to run the iridium plugs but I have heard that people have had issues with the engine not running properly so I kind of gave up on the idea. Maybe I will try my luck with them. Maybe the wider gap was causing the issue they were having.
I think you may be referring to platinum plugs. They tend to run hotter and will increase the chance of KR and typically cause misfiring issues on engines not designed for them.
I think you may be referring to platinum plugs. They tend to run hotter and will increase the chance of KR and typically cause misfiring issues on engines not designed for them.
I think you are right. I believe it was the platinum plugs i was thinking of. Thanks everyone for your input! troy
I run NGK's. Let me look up the number. I had a thread asking the same and found out you need close the gap down. I have them set at . I cant find the receipt at the moment. The are copper and I gapped them at .047, which I found out the hard way is the way to go Sinister recommends the gap be at . 045 to .055. I had mine at 60 and had problems. I think I will take them out and regap them at 45.
[This message has been edited by solotwo (edited 10-11-2013).]
Just like rustangsbware said, seems like many use autolite 104 plugs (including me) with no problems. Gap to about .045. No need to re-invent the wheel here as 6 plugs cost a total of about $12 bucks,
------------------ 84/87 NB, 3800SC, E-85, VS Cam, 2.8 Pulley, 4T65E-HD, HP Tuners, AEM Wideband, Regal GS Gauges, S-10 Brake Booster. 1/4 mile -11.85 at 114mph
[This message has been edited by DimeMachine (edited 10-11-2013).]
