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Thread: .054 Spark Plug Gap Missfire
04-12-2010, 12:26 AM #1
.054 Spark Plug Gap Missfire
I just did the spark plugs and i have always ran the gap at .045, well i did them this time at .054 and theres a miss when the engine is in load. Most of the people here runs them at factory gap but i guess mine dosent like it, this isnt normal is it. Is it because im running a higher compression 10.1?
04-12-2010, 01:13 AM #2
.45 or bust on N/A car
04-12-2010, 09:59 AM #3
I had a similar problem. I had plugs that were gapped at .54, and I had a real bad misfire in the higher RPM's. I gapped em down to about .37 and it fixed them! With an N/A car you might not need to gap them that small. .45 for an N/A car sounds about right.
HomerLincoln Aviator Longblock (NOW BUILT @ 10.5:1) | P1-SC Procharger | Front-Mount Intercooler | BBK Twin 65MM Throttle Body | gReddy Blowoff Valve | 42LB Injectors | Lightning 90MM Blow-Thru MAF | Morpheus 4" Powerpipe | Morpheus Blower-Brace | BBK O/R X Pipe | Mac Cat-Back | Y2K 00R Rims | Tremec 6-Speed | Pro-5.0 T-56 Shifter with 5-speed knob | Aluminum Driveshaft | Fidanza 11" aluminum flywheel | SPEC III clutch | Kauffmann Motorsports Tune | AEM Failsafe Wideband Gauge | Auto-Meter Triple A-Pillar Fuel PSI/Boost/Oil PSI gauges |
04-12-2010, 10:22 AM #4
04-12-2010, 11:53 AM #5
04-12-2010, 12:29 PM #6
Autolite 754s, .54" gap with 10.8 to 1 here, no problems.
04-12-2010, 01:58 PM #7
04-12-2010, 11:15 PM #8
.040 i think is a good gap for nitrous, how much are you spraying?
04-13-2010, 01:08 AM #9
I am not spraying yet..but I will only be spraying a 75-shot, if that. Because I am still on a stock shortblock, so after the carb and spray I'll be at 460-475ish to the wheels.
On the new shortblock.. 100-150 and will gap them closer for that.
I have the nitrous kit just chillin in my room, waiting for my carb'd swap to get done so I can put it in!
04-13-2010, 02:05 AM #10
You definately have to make a thread of you carb swap, not many people go with that route but its going to be interesting!
04-14-2010, 02:02 PM #11
Steeda UD Pulleys, IMRC Deletes, JLT Cold Air intake
- Join Date
- January 2010
Dyno Tuned, SCTSF3, Ford Racing 9mm wires, Full-length Subframe connectors, FRPP 4.10 gears, MGW Shortthrow shifter, Spec Stg.2 clutch, Bassani O/R x-pipe, MT Street ETS, NX 100 wet shot.
04-14-2010, 05:06 PM #12
Nitrous is one thing that you really have to know what your doing. its very tricky!
04-15-2010, 12:04 AM #13
- Join Date
- February 2009
- Largo Florida
a couple of the Die hard guys here ( na svt and Quad) say .054, I've never ran any Stang with a gap that Big even with an MSD box, I'm at .048 now!