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03-01-2004, 10:42 PM | #1 |
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Plug Gap
Just wanted to see what i should be gapping my plugs at. Its a pretty much stock motor out of a 95 gt and its been converted to carb using a performer rpm air gap manifold and a demon carb.
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03-01-2004, 10:51 PM | #2 |
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.054 is a good starting point.
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03-02-2004, 12:04 AM | #3 |
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Yeah that should be fine. I know off hand that fox body 5.0's have a recommended gap of .050 I believe.
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03-02-2004, 09:46 AM | #4 |
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The factory gap is .044, dont go over .050 unless you have an aftermarket ignition system.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
03-02-2004, 09:48 AM | #5 | |
or '331 LX Eric'
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Quote:
E
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1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60' |
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03-02-2004, 04:56 PM | #6 |
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Factory gap is 0.054 inches.
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Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites |
03-02-2004, 09:52 PM | #7 |
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isn't factory gap .054?
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1990 GT,stock T-5,K&N w/o air silencer,March underdrives,FMS wires,timing@14*,PA Perf 130amp alt,Steeda Tri-Ax Shifter,Steeda adj quadrant/clutch cable/firewall adj,Centerforce II clutch,o/r x-pipe,Magnaflow SS catback,g-load brace, subframes,Bilstein struts/shocks,Autometer gauges, 136k and running strong! |
03-03-2004, 11:43 AM | #8 |
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Please excuse my retarded post stock plug gap is .054.
I meant to say dont go over .060 without an aftermarket ignition.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
03-03-2004, 12:06 PM | #9 | |
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Quote:
FMS 9mm wires autolite plugs @ .054 msd blaster coil msd cap/rotor how much can i increase the gap? will be installing an msd6a soon, how much can i increase the gap after the ignition is in?
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1990 GT,stock T-5,K&N w/o air silencer,March underdrives,FMS wires,timing@14*,PA Perf 130amp alt,Steeda Tri-Ax Shifter,Steeda adj quadrant/clutch cable/firewall adj,Centerforce II clutch,o/r x-pipe,Magnaflow SS catback,g-load brace, subframes,Bilstein struts/shocks,Autometer gauges, 136k and running strong! |
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03-03-2004, 12:08 PM | #10 |
or '331 LX Eric'
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There's no need to increase the gap past .054". With a healthy inginition system and proper timing you should be getting a complete burn without any issues.
E
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1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60' |
03-03-2004, 01:10 PM | #11 |
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In one of my 5.0 tuner books they picked up 8rwhp on a stock engine with an ignition system and increasing plug gap to .060
They picked up like 10rwhp with an aftermarket ignition and a plug gap of .060 on a modified motor. Both compared to the stock ignition. I wouldnt doubt if they messed with the timing to achieve those numbers I have my plug gap set at .060 and I shift @ 6000rpms without any issues.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
03-03-2004, 01:54 PM | #12 | |
or '331 LX Eric'
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Quote:
That sounds like F&F talk to me. Maybe more of the gain was attributable to the aftermarket ignition system? Of course, I thought the stocker was fine for minor bolt-ons. E |
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03-03-2004, 04:35 PM | #13 |
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Yeah the .060 in conjunction with the ignition system is what attributed to the HP gain.
The stock ignition is fine for a modified 5.0 but there is power to be had by increasing plug gap with an aftermarket ignition. They didnt see much of a gain until they increased the plug gap so I guess what they were saying is you have to increase spark plug gap to take advantage of your after market ignition.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
03-03-2004, 04:46 PM | #14 |
or '331 LX Eric'
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Cool. Thanks for the info.
E |
03-03-2004, 10:01 PM | #15 |
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I've also heard of filing back the ground electrode on the plug to be even with the + electrode to unshroud the spark for more initial burn area, just a thought - seemed to work on my friend's SAAB turbo but i have nothing to back it up
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2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock) |
03-04-2004, 03:29 PM | #16 |
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Better ignition system = more gap
blown application = less gap better ignition with a blown app = somewhere in the middle?
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