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3800 s/c ... what spark plug to run? by fieroaddicted
Started on: 12-29-2012 04:47 PM
Replies: 15 (857 views)
Last post by: DimeMachine on 10-11-2013 12:19 PM
fieroaddicted
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Report this Post12-29-2012 04:47 PM Click Here to See the Profile for fieroaddictedClick Here to Email fieroaddictedSend a Private Message to fieroaddictedEdit/Delete MessageReply w/QuoteDirect Link to This Post
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.
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Report this Post12-29-2012 05:29 PM Click Here to See the Profile for Fiero GSClick Here to Email Fiero GSSend a Private Message to Fiero GSEdit/Delete MessageReply w/QuoteDirect Link to This Post
I use Autolite 104 spark plugs in my VS cammed Regal GS. 104's would be a good choice with a 3.4 pulley.

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1985 Fiero GT 3.1 with 4 speed 15.93@85.7 MPH
1999 Regal GS L36 VS CAM Intercooled / E85 12.96@ 108 street tires

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Justinbart
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Report this Post12-29-2012 05:35 PM Click Here to See the Profile for JustinbartSend a Private Message to JustinbartEdit/Delete MessageReply w/QuoteDirect Link to This Post
autolite AR104 seems to be ticket for the 3800sc.

I run autolite XP103 my self.

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Turbo 3800 E85 F23 5spd spec5
11.17@132.6

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fieroaddicted
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Report this Post12-29-2012 06:11 PM Click Here to See the Profile for fieroaddictedClick Here to Email fieroaddictedSend a Private Message to fieroaddictedEdit/Delete MessageReply w/QuoteDirect Link to This Post
great thanks guys! I appreciate it!
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jb1
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Report this Post12-30-2012 04:09 PM Click Here to See the Profile for jb1Click Here to Email jb1Send a Private Message to jb1Edit/Delete MessageReply w/QuoteDirect Link to This Post
I have always ran NGK tr6 or tr7.
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fieroaddicted
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Report this Post12-30-2012 04:37 PM Click Here to See the Profile for fieroaddictedClick Here to Email fieroaddictedSend a Private Message to fieroaddictedEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
I have always ran NGK tr6 or tr7.


Thanks!
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bmwguru
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Report this Post12-30-2012 05:35 PM Click Here to See the Profile for bmwguruClick Here to visit bmwguru's HomePageClick Here to Email bmwguruSend a Private Message to bmwguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
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.
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Report this Post12-30-2012 05:55 PM Click Here to See the Profile for JustinbartSend a Private Message to JustinbartEdit/Delete MessageReply w/QuoteDirect Link to This Post
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.

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Turbo 3800 E85 F23 5spd spec5
11.17@132.6

[This message has been edited by Justinbart (edited 12-30-2012).]

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fieroaddicted
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Report this Post12-30-2012 08:30 PM Click Here to See the Profile for fieroaddictedClick Here to Email fieroaddictedSend a Private Message to fieroaddictedEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
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.
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bmwguru
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Report this Post12-31-2012 05:00 AM Click Here to See the Profile for bmwguruClick Here to visit bmwguru's HomePageClick Here to Email bmwguruSend a Private Message to bmwguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Justinbart:

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.

 
quote
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.
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MstangsBware
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Report this Post12-31-2012 05:31 AM Click Here to See the Profile for MstangsBwareClick Here to Email MstangsBwareSend a Private Message to MstangsBwareEdit/Delete MessageReply w/QuoteDirect Link to This Post
AL104s at ur MOD level and 103s when dropping down pullies and adding more MODs..
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fieroaddicted
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Report this Post12-31-2012 11:51 AM Click Here to See the Profile for fieroaddictedClick Here to Email fieroaddictedSend a Private Message to fieroaddictedEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
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!
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Report this Post10-09-2013 07:37 AM Click Here to See the Profile for NightMare CruiserSend a Private Message to NightMare CruiserEdit/Delete MessageReply w/QuoteDirect Link to This Post
Will these work or are they too cold?

http://www.autozone.com/aut...entifier=444815_0_0_

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It's a CAR, now drive it!!
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Coming Soon 3800 swap: Fierox: Mounts

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NightMare Cruiser
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Report this Post10-10-2013 07:31 AM Click Here to See the Profile for NightMare CruiserSend a Private Message to NightMare CruiserEdit/Delete MessageReply w/QuoteDirect Link to This Post
Anyone?
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solotwo
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Report this Post10-11-2013 12:05 AM Click Here to See the Profile for solotwoSend a Private Message to solotwoEdit/Delete MessageReply w/QuoteDirect Link to This Post
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).]

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DimeMachine
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Report this Post10-11-2013 12:19 PM Click Here to See the Profile for DimeMachineSend a Private Message to DimeMachineEdit/Delete MessageReply w/QuoteDirect Link to This Post
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,

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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).]

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