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05-12-2013, 02:37 PM
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CC Member
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Join Date: Mar 2003
Location: Garden City Long Island,
NY
Cobra Make, Engine: SUPERFORMANCE #2258 402 S/R -ROUSH
Posts: 153
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Not Ranked
Problem with my Roush 402 S/R
Hi Guys Having problem with plugs foiling up Heavy carbon. I don't much history with this engine only 100 miles or so on new plugs E3s . Went to cruise night on Friday night in rush hour, i was in stop and go traffic 30 minutes away from my home. When finally got to show it sounded like running 3 or 4 cly. only. when left i was able to drive it hard and some what clear up problem. check all the normal thing choke, air-filter etc. looking information what plugs you guys are using gap? timing? car has MSD ing. 6al unit in it.
__________________
Kenny
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05-12-2013, 02:57 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,452
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Not Ranked
There's nothing magical about a spark plug. It either works or it doesn't. Use a standard copper core Autolite plug, as recommended for your heads.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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05-12-2013, 03:41 PM
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CC Member
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Join Date: Mar 2003
Location: Garden City Long Island,
NY
Cobra Make, Engine: SUPERFORMANCE #2258 402 S/R -ROUSH
Posts: 153
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Not Ranked
what autolite # and gap?
__________________
Kenny
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05-12-2013, 04:30 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,452
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Not Ranked
It all depends on what heads you have. Look in the book for the heads, and see what plugs they recommend. Then cross reference for the Autolite plugs.
I'd probably start with a 0.035" gap and adjust from there.
I have Dart Pro-1 heads. i use a Autolite 3924 plug, gapped to 0.035". That seems to work well.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
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05-12-2013, 05:28 PM
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CC Member
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Join Date: Dec 2001
Cobra Make, Engine: BDR
Posts: 536
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Not Ranked
Looking in my old parts catalog for Roush, they recommend either Accel 276 or champion RV12C.
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05-12-2013, 06:09 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
It's the E3 plugs. Throw them in the garage and buy standard Autolite or Champion..
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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05-12-2013, 06:48 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
I use the E3 plugs and really like them. It seems to run better. I think it is that you don't have to gap the E3's, but not exactly sure why.
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05-12-2013, 09:11 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
Quote:
Originally Posted by bobcowan
It all depends on what heads you have. Look in the book for the heads, and see what plugs they recommend. Then cross reference for the Autolite plugs.
I'd probably start with a 0.035" gap and adjust from there.
I have Dart Pro-1 heads. i use a Autolite 3924 plug, gapped to 0.035". That seems to work well.
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I'm running the Autolite 3924 plugs in my Roush 402. What do your plugs look like? There was a problem with the intake gaskets failing on the Roush 402s (happened to my motor).
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
Last edited by Got the Bug; 05-12-2013 at 10:33 PM..
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05-12-2013, 10:23 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,592
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Not Ranked
If you have an MSD box, then I believe you gap your plugs at .045 or .010 larger than the recommended gap w/o an MSD.
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05-13-2013, 06:22 AM
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CC Member
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Join Date: Feb 2008
Location: Rochester,
NY
Cobra Make, Engine: Superformance
Posts: 194
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Not Ranked
Kenny,
I have a Roush 402 in #2259 and probably have the same engine setup since cars are both about the same age.
Mine came from Roush with Autolite 605 and .040 gap. I've been using that setup for all plug changes and plugs look good when removed.
There are a lot of plugs ans gaps but for right now, I'll stick with what seems to work.
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