Re: Another plug read
[Re: mopar dave]
#2693223
08/31/19 06:22 PM
08/31/19 06:22 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
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Washington
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If the specks aren't purple and shiny it's just carbon blowing off the inside of shell. Kind of hard to see that in a picture. As to heat range, you are about right on. The other thing to look at is the fuel ring at the bottom of the porcelain. How wide is it?
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Another plug read
[Re: mopar dave]
#2693224
08/31/19 06:24 PM
08/31/19 06:24 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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Forgot to add your intial timing looks about spot on. From the angles you posted it looks like you may have a skosh (and by skosh I mean maybe, maybe 2 degrees) too much total.
On pump gas you want the total line on the ground wire close to the shell. It's hard to tell how close you are in that picture, hence my skosh remark.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Another plug read
[Re: mopar dave]
#2693362
09/01/19 08:57 AM
09/01/19 08:57 AM
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Joined: Jan 2005
Posts: 3,635 Oakland, MI
dizuster
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Oakland, MI
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Unfortunately, You can't learn much from reading a plug with multiple tunes and multiple passes on it.
Buy yourself a bunch of plugs from rockauto.com (very cheap NGK prices!), and make one pass. Click the car off at the finish line, take the plugs out, and cut one apart to see the fuel ring down at the base of the porcelain.
Driving it back, or multiple passes will give you bad information, and could just lead you in the wrong direction.
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Re: Another plug read
[Re: dizuster]
#2693383
09/01/19 10:15 AM
09/01/19 10:15 AM
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Joined: Jan 2007
Posts: 8,031 Mt Morris Michigan
mopar dave
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Mt Morris Michigan
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Ok, I was told by another racer that you need 3 passes on a new plug to get enough to read on the plug. I'm really curious to reading the heat range and timing(pic 1 and 4) of this plug as I have some brand new 7's I can throw in for next testing. As far as mixture reading, the wide band was showing rich at 12.5 thru the traps and was showing leaner with every pass with a 13.2 on the last pass being the fastest pass, so looks like I need to lean it up just a bit with a HS bleed change. Thanks guys
Last edited by mopar dave; 09/01/19 10:21 AM.
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Re: Another plug read
[Re: mopar dave]
#2693430
09/01/19 12:30 PM
09/01/19 12:30 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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If the specs are brown, it's carbon, either coming off the inside of the shell, or from the combustion chamber. If they are shiny and purple. That's detonation.
You don't need to put new plugs in every run, unless you are tuning for wide open throttle. A plug will show changes in one pass. If you can't see changes in one pass, you are way off or something else is wrong.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Another plug read
[Re: mopar dave]
#2693444
09/01/19 01:37 PM
09/01/19 01:37 PM
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Joined: Aug 2003
Posts: 43,115 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,115
Bend,OR USA
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I wonder if the race gas was affecting the AFR readings due to mixing with the pump gas better from being sloshed around from the runs, hence the time slips difference in MPH Where you monitoring the density altitude? With no jetting changes the AFR should have remain the same All Information is good
Last edited by Cab_Burge; 09/01/19 01:38 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Another plug read
[Re: mopar dave]
#2693551
09/01/19 11:27 PM
09/01/19 11:27 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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Cab, the temp dropped fast from 6pm till 9:30, 72 to 58 on last pass. Was not watching density. The cooler air with low humidity 48% helped with every run. I just cut a plug for sh!ts and giggles. 7 runs with idle time in line and on and back off trailer. The fuel ring is probably twice as wide as it should be. It should be .060-.080 wide. Looks like more than that in the picture. Also remember you have to keep everything happy, so the fuel ring may need to be .100 wide for best MPH and that's ok. But of you can get the fuel ring narrower and still keep the MPH going up or at least not losing, the better off you should be. You may be a bit rich at idle and cruise as well and again, that depends on your combination. If you can get the color on the upper end of the porcelain to lighter brown or get it off there all together it may like it. Or...with your intake/carb/air cleaner etc it may not like to be that lean Only testing will tell you. And not running a vacuum advance may mean you can't get much leaner if you aren't running a VA.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Another plug read
[Re: madscientist]
#2693585
09/02/19 09:25 AM
09/02/19 09:25 AM
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Joined: Jan 2007
Posts: 8,031 Mt Morris Michigan
mopar dave
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Mt Morris Michigan
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Going back to the track with timing bumped back up to 36*, had some new 7's on the bench, so put them in. They are a champion race style plug with cut back ground strap. See if it likes them. If it runs a little fat Dom tells me to change the HS bleeds to a 30. Looking to gain another 10th or 2, but 9's or a 10 O is not gonna happen without changing some hard parts. I thought I had a good combo of parts here to make 680-700hp, but its just not there. Dwayne spec'd the cam and its in at 105.5. Lenny freshened the 8" 5100 vert and it calcs to a 6% slip thru traps. Seems soft off the line with a 1.45 60 foot braking to 2500rpm and worse at 2000rpm. Maybe advancing the cam more would help? No vac advance. A fast curve only 30* initial and 36* total.
Last edited by mopar dave; 09/02/19 09:28 AM.
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