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11-04-2009, 08:35 PM
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#1 |
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Registered User
Trader Feedback: (3)
Join Date: Dec 2006
Location: Granite Quarry, N.C.
Posts: 199
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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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10:1 forged short block. Aviator heads w/3 angle valve job, Mach 1 intake, Stegmier ported TB, 96 Cobra cams, ProCharger D1SC/3.4 pully, GI Joe 8 rib Conversion,#60's, full exhaust, heavily modified suspension, Spec stg 3, plenty of fuel,..almost ready to be fired up!!! 
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11-04-2009, 10:27 PM
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#2 |
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Registered User
Trader Feedback: (10)
Join Date: Nov 2004
Location: Warren Pennsylvania
Posts: 462
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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 and bolt ons 1990 Mustang GT 5.0, 5 speed, GT40s, 1.72rr's, B-cam, 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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11-04-2009, 11:09 PM
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#4 | |
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Registered User
Trader Feedback: (2)
Join Date: Jul 2004
Location: palmdale,california
Posts: 306
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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, 12:11 AM
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#6 |
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Registered User
Trader Feedback: (7)
Join Date: Apr 2006
Location: San Jose, CA
Posts: 1,129
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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.
__________________
Mark Olson 96 Cobra: KB 1.7L, IMRC Delete, Volant CAI, 90mm Lightning MAF, 42lb injectors, T56, Steeda clutch adjuster, Custom 11" metal puck clutch, 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, 11:28 AM
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#8 | |
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Registered User
Trader Feedback: (10)
Join Date: Nov 2004
Location: Warren Pennsylvania
Posts: 462
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Quote:
yeah where would you even index the plug on the 4v motor?
__________________
1997 Cobra w/ 4.10s and bolt ons 1990 Mustang GT 5.0, 5 speed, GT40s, 1.72rr's, B-cam, 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, 01:45 PM
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#9 | |
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Registered User
Trader Feedback: (9)
Join Date: Sep 2000
Location: Queens, NyC
Posts: 5,359
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Quote:
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1998 Cobra vert- H/C/I, 3" ex, T56, 4.56 America; We're only tough with tax payers. |
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11-05-2009, 02:39 PM
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#10 |
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Registered User
Trader Feedback: (32)
Join Date: Nov 2003
Location: Abingdon, Md.
Posts: 2,856
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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.
__________________
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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