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11-04-2009, 09:35 PM
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#1 |
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Registered User
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Join Date: Dec 2006
Location: Granite Quarry, N.C.
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Indexing spark plugs????
I was talking to one of my team leaders at work today & said he was going home to tune up his new (6 races) drag car engine. He asked me if I've ever indexed my plugs. He said he just got off the phone with the guy that built his engine & the guy told him to index the plugs, it would make a difference in how the engine ran & power(15-30hp)!! Told him you would see it on an engine dyno but probably not on a chassis dyno, but said it would definately affect performance of the motor. He said it had shims on the plugs when he took them out to change them. Now, his engine is a chevy 383, Rossler power glide, solid roller cam, 14:1 comp, CNC ported Dart Pro-1's....high dollar engine & tranny. Car goes 6.0 's 1/8th(with throttle stop) in a 91 LX. My question is.... have any of you ever tried this?? Is there really power to be gained by indexing?? Is it worth the time & effort?? What would the effects be on a S/C car??
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ProCharger P1SC @ 9 PSI-Converted to a draw through meter,3 Core Intercooler, Gear, BBK O/R, Borla XR Pro's, #42's, L 90mm, Rear upper & lowers, Subframes, FRPP Alum Drive Shaft, lots of other stuff...  Tuned by Dan @ Pro-Dyno. 449 RWHP/400 RWTQ...Built motor & a D1 coming soon.....
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11-04-2009, 11:27 PM
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#2 |
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Location: Warren Pennsylvania
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I wouldnt think it would matter in the 4v motor.. I always did it in my 5.0's and it did show gains, not much but some. Indexing the plug on a modified 5hp briggs shows significant gains.
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1997 Cobra w/ 4.10s 1990 Mustang GT 5.0, 5 speed, GT40Ps, 1.5 Kenne Bell'ed 1990 Mustang LX Coupe 5.0, 5 speed, some bolt ons and tube front end with coilovers 1994 F150 4x4, 5.0, 5 speed, lifted, 33's, and a 1972 Honda CB350 Four |
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11-05-2009, 12:09 AM
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#4 | |
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Location: palmdale,california
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Quote:
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comp orange 04 cobra, agent 47 sla, cai, 2.93 pulley, tune and cat-back, teksid block, 450rwhp. Running open track events all year round in socal including in 110 degree weather without going into limp mode. This is a street driven cobra that also does 117 in the 1/4 mile on street tires. |
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11-05-2009, 01:11 AM
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#6 |
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Location: San Jose, CA
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I don't understand how indexing would work on my 03 Cobra heads. The spark plug is in the center of the combustion chamber so it really shouldn't matter which way the electrode points.
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Mark Olson 96 Cobra: KB 1.7L, IMRC Delete, Volant CAI, 90mm Lightning MAF, 42lb injectors, T56, Steeda clutch adjuster, GT500 twin disk clutch & flywheel, Pro 5.0 shifter, PLX M300 WB O2 sensor, Xcal2 w/ Pro-racer package, Flowmasters, Griggs subframe connectors. |
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11-05-2009, 12:28 PM
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#8 | |
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Registered User
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Quote:
yeah where would you even index the plug on the 4v motor?
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1997 Cobra w/ 4.10s 1990 Mustang GT 5.0, 5 speed, GT40Ps, 1.5 Kenne Bell'ed 1990 Mustang LX Coupe 5.0, 5 speed, some bolt ons and tube front end with coilovers 1994 F150 4x4, 5.0, 5 speed, lifted, 33's, and a 1972 Honda CB350 Four |
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11-05-2009, 02:45 PM
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#9 | |
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Location: Queens, NyC
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Quote:
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1998 Cobra vert 32v Mustangs; turning normal, everyday people into mechanics since 1996. |
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11-05-2009, 03:39 PM
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#10 |
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Registered User
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Location: Abingdon, Md.
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I wouldn't think there is much to gain on the 4v but it should pick up something on the 5.0. 30 hp is quite a stretch though IMO.
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2005 F250 Super Duty Harley Davidson True Blue 1997 SVT Cobra Pacific Green 1995 5.0 GT Dark Forest Green If you aren't living on the edge, you're takin' up too much space! |
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