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Reading methonal plugs? #515338 11/03/09 04:06 PM 11/03/09 04:06 PM
Joined: Jul 2004 Posts: 1,868 Cali S.B Sub95 OP super gas
Sub95 OP super gas Joined: Jul 2004 Posts: 1,868 Cali S.B	What should a NA methonal plug look like after a pass?. Thanks

Re: Reading methonal plugs? [Re: Sub95] #515339 11/03/09 04:13 PM 11/03/09 04:13 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer master
Bob_Coomer master Joined: Nov 2003 Posts: 6,293 Rock Springs	Its hard to read a alky plug, from boarder line "rich" to boarder line "lean" the plugs look the same to me despite what EGT, or MPH says. When you find out let me know... here is a bump for ya.. I can tell you that with lots of squeeze and on alky, plug gaps doesnt like to be much wider than .035 I get the tune close, and tune for MPH the same way I do on gas. When your close it will gain about 8 deg temp from launch to cross the finish line..You gotta look down fast, cause once your off the throttle the temps will fall fast... I try to stage the car at or near 160.. [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: Reading methonal plugs? [Re: Sub95] #515340 11/03/09 10:02 PM 11/03/09 10:02 PM
Joined: Jan 2003 Posts: 10,006 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,006 Frostbitefalls MN (Rocky&Bullw...	I use NGK plugs, go by how much plating is scorched on the plug plus exhuast temp readings. I was told you like to see about 2/3 of the plating scorched at the base of the plug, or the surface that is even with the chamber wall. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: Reading methonal plugs? [Re: gregsdart] #515341 11/04/09 06:54 AM 11/04/09 06:54 AM
Joined: Oct 2005 Posts: 976 ontario canada mac56 super stock
mac56 super stock Joined: Oct 2005 Posts: 976 ontario canada	Quote: I use NGK plugs, go by how much plating is scorched on the plug plus exhuast temp readings. I was told you like to see about 2/3 of the plating scorched at the base of the plug, or the surface that is even with the chamber wall. I found that after only one run on a plug, if the plating has burnt off just down off the ground strap onto the top ring of the plug you are close. It is very hard to tell. They will tan up after a few runs if you are close. You can tell if it is rich because the plug looks washed but lean is another story even with egt gauge. I had good temp reading and leaned out. Took the porcelian right off the electrode.

Re: Reading methonal plugs? [Re: gregsdart] #515342 11/04/09 07:13 AM 11/04/09 07:13 AM
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	Quote: I use NGK plugs, go by how much plating is scorched on the plug plus exhuast temp readings. I was told you like to see about 2/3 of the plating scorched at the base of the plug, or the surface that is even with the chamber wall. NGK Have to be read after one run with the engine shutoff before the turn off. Have to use new plugs every run to be able to read them.I've read hundreds. I wanted to see 2 threads discolored.

Re: Reading methonal plugs? [Re: Challenger 1] #515343 11/04/09 11:52 AM 11/04/09 11:52 AM
Joined: Jan 2003 Posts: 10,006 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,006 Frostbitefalls MN (Rocky&Bullw...	Quote: Quote: I use NGK plugs, go by how much plating is scorched on the plug plus exhuast temp readings. I was told you like to see about 2/3 of the plating scorched at the base of the plug, or the surface that is even with the chamber wall. NGK Have to be read after one run with the engine shutoff before the turn off. Have to use new plugs every run to be able to read them.I've read hundreds. I wanted to see 2 threads discolored. I guess you are building a bit more heat! 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: Reading methonal plugs? [Re: Challenger 1] #515344 11/04/09 11:56 AM 11/04/09 11:56 AM
Joined: Apr 2005 Posts: 1,106 Quebec, Canada D Diablo super stock
Diablo super stock D Joined: Apr 2005 Posts: 1,106 Quebec, Canada	With the new engine we are using NGK's and need to change hte plugs every run to read them. We were told to have the platinum 2/3 burnt off the plug. You can tell if the timing is good also by a small burn mark going up the neck of the plug. What confuses me is what EGT i should have. Depending on who i talk to its anywhere from 1050 to 1250?????? That a big difference! What was weird about our engine was one side was reading to rich where the other side was almost to lean.

Re: Reading methonal plugs? [Re: Sub95] #515345 11/04/09 07:40 PM 11/04/09 07:40 PM
Joined: Jul 2009 Posts: 169 SW WI C cudacustoms1 member
cudacustoms1 member C Joined: Jul 2009 Posts: 169 SW WI	What are you running for a motor.If you are running a weadge head don't try the 2 tread down as agood heat.I have been there! The max setting we found would show heat all the way aroud the top of the plug. If it's starting down to the treads get some more fuel in.Again this is on weadge head. Hemi is a whole diferent deal. Then the two thread deal is good.We backed my motor to where it was 3/4 around the plug.If you use top end lube it will make it harder to read also.There is a good article on dragstuff by mike canter about reading alcohol plugs.

Re: Reading methonal plugs? [Re: cudacustoms1] #515346 11/04/09 08:58 PM 11/04/09 08:58 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	My experiance is with a blown/injected BB Chevy which is still a wedge of sorts & we always looked for two threads...

Re: Reading methonal plugs? [Re: 1_WILD_RT] #515347 11/05/09 01:27 PM 11/05/09 01:27 PM
Joined: Jan 2003 Posts: 684 St. Charles, MO. S Slingshot383 mopar
Slingshot383 mopar S Joined: Jan 2003 Posts: 684 St. Charles, MO.	If you're burning the tip of the electrode, you're lean! 1994 Undercover Chassis 125" altered stack injected big block, soon blown and injected Member of The Torque and Recoil Club

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