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Frequency of spark plug changing?? #977286 04/21/11 08:46 AM 04/21/11 08:46 AM
Joined: Jan 2007 Posts: 1,169 MI 6 68shifter OP super stock
68shifter OP super stock 6 Joined: Jan 2007 Posts: 1,169 MI	Just curious how frequent everyone changes their plugs. At $75 a set they're not quite as easy to just pitch after 8-10 runs like I used to. I'm thinking in general a 10-11 sec car on race fuel blah blah blah. Just curious of everyone elses practices? Thanks. 68' Barracuda (4 speed) 64' Savoy (4 speed) 65' Satellite (girl tranny)

Re: Frequency of spark plug changing?? [Re: 68shifter] #977287 04/21/11 09:00 AM 04/21/11 09:00 AM
Joined: Jan 2003 Posts: 26,016 United Socialist States of Ame... T tboomer Too Many Posts
tboomer Too Many Posts T Joined: Jan 2003 Posts: 26,016 United Socialist States of Ame...	Where's Eric?? Need your rear end checked out? Contact Grizzly!!

Re: Frequency of spark plug changing?? [Re: tboomer] #977288 04/21/11 09:14 AM 04/21/11 09:14 AM
Joined: Jul 2010 Posts: 1,491 Oologah, Oklahoma Big Squeeze pro stock
Big Squeeze pro stock Joined: Jul 2010 Posts: 1,491 Oologah, Oklahoma	If the A/F ratio at idle, part throttle, and WOT is dialed in, it's a waste of money to throw them away after 10 runs.........I run mine all season......On Chad Henderson's car, Monte put 23 consecutive passes on the car, running 4.60's-4.80's and never even had the plugs out...... If you can't handle the truth, you're living a lie.......

Re: Frequency of spark plug changing?? [Re: 68shifter] #977289 04/21/11 09:21 AM 04/21/11 09:21 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Maybe every 2 or 3 years... depends if I feel like it

Re: Frequency of spark plug changing?? [Re: MR_P_BODY] #977290 04/21/11 09:43 AM 04/21/11 09:43 AM
Joined: Nov 2003 Posts: 2,273 Greenville, South Carolina BBLM23 top fuel
BBLM23 top fuel Joined: Nov 2003 Posts: 2,273 Greenville, South Carolina	Quote: Maybe every 2 or 3 years... depends if I feel like it Walter 1969 Dart Swinger w/ARC Pump Gas 493 B1/BS 10.18 at 130mph Racing Pro in street trim. 1981 Aries ARC 548 B1 8.88 at 147mph (footbraking) 1996 Ram 2500 V10 16.52 at 80mph 1981 Reliant 400

Re: Frequency of spark plug changing?? [Re: BBLM23] #977291 04/21/11 10:22 AM 04/21/11 10:22 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Once a year. I'll blast them off to get a fresh read if I have made any changes that may effect the AF ratio. I do pull them every 20 runs or so, just to look at them and I usually run a comp test while they are out. I'll yank the valve covers at the same time just to inspect the valve train. Probably over-kill, but it keeps me in my comfort zone Fastest 300

Re: Frequency of spark plug changing?? [Re: Crizila] #977292 04/21/11 10:44 AM 04/21/11 10:44 AM
Joined: Jan 2007 Posts: 1,169 MI 6 68shifter OP super stock
68shifter OP super stock 6 Joined: Jan 2007 Posts: 1,169 MI	Wow, guess I am set on plugs for life then. I've never had any that were suspect or gained or lost et and always an appropriate tan color, no AF monitoring stuff but not concerned. Don't know when/where I heard the routine I've been using just assumed it was standard practice. Be a little nicer too since changing plugs in a bb a-body sucks. Thanks. 68' Barracuda (4 speed) 64' Savoy (4 speed) 65' Satellite (girl tranny)

Re: Frequency of spark plug changing?? [Re: 68shifter] #977293 04/21/11 11:12 AM 04/21/11 11:12 AM
Joined: Jan 2003 Posts: 16,932 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,932 NC	Years ago I used to put new ones in at the beginning of each year. Then I realized there was nothing wrong with them and now I do it every two years (~300 passes), and save those plugs for emergency spares. I think a set of 8 costs $25-30. 1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1

Re: Frequency of spark plug changing?? [Re: 440Jim] #977294 04/21/11 12:19 PM 04/21/11 12:19 PM
Joined: Jan 2003 Posts: 4,285 Ohio 6 64dodge572 master
64dodge572 master 6 Joined: Jan 2003 Posts: 4,285 Ohio	With todays MSD/electronic ignition systems, plugs are good for several years and 100's of runs. I have found an electrode burnt off on my old 572 Hemi will no obvious ill effects. I found it when running the valves, as you have to pull the plugs to get the valve covers off. Wayne

Re: Frequency of spark plug changing?? [Re: 64dodge572] #977295 04/21/11 12:27 PM 04/21/11 12:27 PM
Joined: Jul 2008 Posts: 30,502 Florida STAYcation dOc … The village idiot's idiot
dOc … The village idiot's idiot Joined: Jul 2008 Posts: 30,502 Florida STAYcation	You are gonna me ... In my 440 in my 62 ..... the J-11Y's that are in that were put in a 383 ....... ..... back in 1979 !

Re: Frequency of spark plug changing?? [Re: tboomer] #977296 04/21/11 02:51 PM 04/21/11 02:51 PM
Joined: Jul 2010 Posts: 2,422 Pittsburgh PA Eric top fuel
Eric top fuel Joined: Jul 2010 Posts: 2,422 Pittsburgh PA	Quote: Where's Eric?? You guys can send me your one year old plugs for the box in my trailer... ...actually at the 10k's at Norwalk I had a miss with the new NGK plugs I had put in...silly me...broke out the box and a set of Autolites I ran in the Duster...purred like a kitten 5.53 @ 125 1/8th on the launch control..more left in her!

Re: Frequency of spark plug changing?? [Re: 68shifter] #977297 04/21/11 03:09 PM 04/21/11 03:09 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	8 every run...it was twice that when we ran 16 plug hemis.We read those plugs every run, can't read them after one run.

Re: Frequency of spark plug changing?? [Re: dOc …] #977298 04/21/11 08:21 PM 04/21/11 08:21 PM
Joined: Jan 2007 Posts: 1,169 MI 6 68shifter OP super stock
68shifter OP super stock 6 Joined: Jan 2007 Posts: 1,169 MI	Quote: You are gonna me ... In my 440 in my 62 ..... the J-11Y's that are in that were put in a 383 ....... ..... back in 1979 ! When I started racing (age18) in 2002 my dad went nuts saying we had to find them damn J11Y's. I called all over the country for those things cuz dad said the 440 never ran so good. I switched to the superceeded number, rj12yc I think and never stopped catching crap. You old guys and j11y's 68' Barracuda (4 speed) 64' Savoy (4 speed) 65' Satellite (girl tranny)

Re: Frequency of spark plug changing?? [Re: dOc …] #977299 04/21/11 08:48 PM 04/21/11 08:48 PM
Joined: Jul 2010 Posts: 3,502 SOUTH JERSEY HEMIFRED master
HEMIFRED master Joined: Jul 2010 Posts: 3,502 SOUTH JERSEY	Quote: You are gonna me ... In my 440 in my 62 ..... the J-11Y's that are in that were put in a 383 ....... ..... back in 1979 ! I still have sets of 10Y's,11y's and 12Y's in the boxes along with some long reach N's home of the Sox and Martin Hemi Duster

Re: Frequency of spark plug changing?? [Re: 68shifter] #977300 04/21/11 09:42 PM 04/21/11 09:42 PM
Joined: Jul 2008 Posts: 30,502 Florida STAYcation dOc … The village idiot's idiot
dOc … The village idiot's idiot Joined: Jul 2008 Posts: 30,502 Florida STAYcation	Quote: You old guys and j11y's OLD guys ? .. ...whatchootalkinabout ? ... In 79 .... I was 6 years old(turning 39 next year) ...YEAH - that's the ticket ........ Those plugs sure have never missed a beat.... I had my 62 going 5400 in high gear with a 2.76 gear on I-94 in front of Metro Airport some years back. But I do remember those days when I was a Berri Bum ..and had to change plugs every week going to Milan and Telegraph..... But THEN ....... J-11Y's were only 59 cents each ...and Sunoco 260 was 30 cents per ! And Fred ......what DOESN'T he have ? ...

Re: Frequency of spark plug changing?? [Re: dOc …] #977301 04/21/11 10:43 PM 04/21/11 10:43 PM
Joined: Nov 2009 Posts: 3,410 Belpre,Ohio C CHAPPER master
CHAPPER master C Joined: Nov 2009 Posts: 3,410 Belpre,Ohio	Quote: Quote: You old guys and j11y's OLD guys ? .. ...whatchootalkinabout ? ... In 79 .... I was 6 years old(turning 39 next year) ...YEAH - that's the ticket ........ Those plugs sure have never missed a beat.... I had my 62 going 5400 in high gear with a 2.76 gear on I-94 in front of Metro Airport some years back. But I do remember those days when I was a Berri Bum ..and had to change plugs every week going to Milan and Telegraph..... But THEN ....... J-11Y's were only 59 cents each ...and Sunoco 260 was 30 cents per ! And Fred ......what DOESN'T he have ? ... Saw a shirt one time,,,I think it would fit you Doc. It said.."The OLDER I get, the faster I USED to go" If you like drag racing, support your local track.

Re: Frequency of spark plug changing?? [Re: 68shifter] #977302 04/22/11 01:00 AM 04/22/11 01:00 AM
Joined: Mar 2008 Posts: 883 Affton MO Q qwkmopardan super stock
qwkmopardan super stock Q Joined: Mar 2008 Posts: 883 Affton MO	I am still running the same plugs that were installed when engine was on the engine stand. This is the beginning of third season on this engine. I use Champions in my 915 BBM heads. You can't get cold J series plugs anymore but Champion part#587,[H8C]is a good cold plug for iron big block heads.

Re: Frequency of spark plug changing?? [Re: qwkmopardan] #977303 04/22/11 11:25 AM 04/22/11 11:25 AM
Joined: Oct 2003 Posts: 11,688 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,688 W. Kentucky	I ususally change mine every spring when I change the oil. They never look bad, so this year I just left them in.

Re: Frequency of spark plug changing?? [Re: BBLM23] #977304 04/23/11 02:29 PM 04/23/11 02:29 PM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: Quote: Maybe every 2 or 3 years... depends if I feel like it I do them as needed. I haven't had the chance to run this year so they have lasted longer. Maybe thats the secret.

Re: Frequency of spark plug changing?? #977305 04/23/11 03:54 PM 04/23/11 03:54 PM
Joined: Jul 2004 Posts: 487 D Dyno1 mopar
Dyno1 mopar D Joined: Jul 2004 Posts: 487	I was with a friend when he was dynoing his S/S Hemi, it was down on power from previous years, so when we checked the valves I looked at his plugs and asked him how old they were. They were a season old but looked good, so we changed them anyways, he picked up the 40-50 hp he was down. I change them often. Dyno

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