Re: Spark plug heat range??
[Re: hemi-itis]
#1669681
09/16/14 01:34 AM
09/16/14 01:34 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Iron heads,iron block best pass @ 10lbs was 9.907 @140 mph at 35*.
That sure sounds like a lot of timing on 10# specially with iron heads ![](/ubbthreads/images/graemlins/wave.gif)
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669683
09/16/14 02:33 PM
09/16/14 02:33 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Quote:
Quote:
Iron heads,iron block best pass @ 10lbs was 9.907 @140 mph at 35*.
That sure sounds like a lot of timing on 10# specially with iron heads
If the carbs were too fat,increasing the timing would clean the plugs up to a certain extent.Went from 32*,to 35* and then 37*.to get the plugs you see at the top of the thread. 37* the e/t & MPH fell off but the plug looked the best. I will try a set of 7's and go from there
Sounds like you better start working on the cruise A/F ratio then pull some timing ![](/ubbthreads/images/graemlins/wave.gif)
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669685
09/16/14 03:59 PM
09/16/14 03:59 PM
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Joined: Jan 2005
Posts: 3,635 Oakland, MI
dizuster
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If you REALLY want to read the plug you need to do the following...
1) Make a full pass and click it off at the finish. 2) Tow it back and pull all 8 plugs out.
Trying to read fuel from plugs that have been at anything else but WOT can be misleading.
You CAN read timing from a plug that's been idled afterwards though because the idle temp is much lower then the WOT temp, so the cadmium on the NGK's won't burn back any further.
Those plugs look like they have a touch too much timing in them, but keep in mind that the timing "mark" can be different for any given motor for any given plug range.
As an example I ran a -10 plug on my iron headed turbo car last year. 9:1 compression at 20psi. What's funny is that when it "caved" in the pistons (too much power/heat for a off the shelf slug), the timing mark was just BARELY showing on the tip (no signs of detonation either). What that tells me is if you have too cold of a plug in it, you can fool yourself into trying to read timing from the plug.
What the pictures of your plug do tell me is that you have more then enough octane for what you're running (lots of timing shown on the strap, without any detonation signs).
Not to say I ignore the plugs, but now I read the plug for signs of problems (burn too far on the electrode (excessive timing), and or signs of detonation), but mainly I tune off 1/8mph.
I try not to tune off 1/4mph because it's well above the peak TQ RPM by that point. If you keep tuning for high RPM (1/4 mile MPH), you can hurt the motor with too much timing through the mid range. If it's going to detonate... it's going to do it at peak TQ.
I approach tuning my Turbo car like this.
1) Start low on boost with conservative timing.
2) Get the fuel right.
3) Conservatively rough in the timing. Add some and watch the 1/8mph. Best 1/8mph timing minus 2~4 at this boost level. This will give you a pretty good idea how much deg/boost you need to pull out for a safe attempt at more boost.
4) Add boost and make sure that the fuel still looks good.
5) ONLY THEN add timing.
Sounds like you skipped right to step 5... lol I would take a bit of timing out of it. Tune the fuel until you get the 1/8mph optimized, then sneak the timing back in it.
In this case you've been very lucky that you have enough octane to cover the boost/compression/timing you've tried. On a more aggressive setup the tuning window can be MUCH smaller.
Good luck with the tuning, hope some of that helped you!
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Re: Spark plug heat range??
[Re: Thumperdart]
#1669689
09/19/14 11:53 AM
09/19/14 11:53 AM
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Joined: Dec 2007
Posts: 12,588 Great Neck,LI,new york
hemi-itis
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Spoke with Patrick at Pro systems,he said try the 7's with no other changes and go from there. Every thing I read points to lower timing,I need to get to a track rental!!! ![](/ubbthreads/images/graemlins/whistling.gif)
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669690
09/19/14 12:25 PM
09/19/14 12:25 PM
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Joined: May 2011
Posts: 4,489 northern,Ohio,USA
Clanton
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Quote:
Spoke with Patrick at Pro systems,he said try the 7's with no other changes and go from there. Every thing I read points to lower timing,I need to get to a track rental!!!
I hope he was able to provide more info than that!
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Re: Spark plug heat range??
[Re: Clanton]
#1669692
09/20/14 12:35 AM
09/20/14 12:35 AM
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Joined: Dec 2007
Posts: 12,588 Great Neck,LI,new york
hemi-itis
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Quote:
Quote:
Spoke with Patrick at Pro systems,he said try the 7's with no other changes and go from there. Every thing I read points to lower timing,I need to get to a track rental!!!
I hope he was able to provide more info than that!
Pat said to take some timing out and try the 7's.I don't know when I can get back to the track,so I have to hit the "spot" for some plug readings. Thanks Dizuster,your right,,,,,,kinds jumped to 5 ![](/ubbthreads/images/graemlins/laugh2.gif)
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669698
09/21/14 01:46 AM
09/21/14 01:46 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Quote:
http://www.wallaceracing.com/plug-reading-lm.html
Thanks for reminding me of those pictures ![](/ubbthreads/images/graemlins/thumbs.gif) Put the 7's in and dropped boost for pump gas and went to a car show today in Lido Beach.It was 35 miles round trip. Did not have a chance to pull any plugs,curious to see if they cleaned up in the cruze mode
I dis agree with the Wallace on the plugs... they say the timing isnt read on the ground strap... I dis agree... and if you want to see another link that shows what I'm saying I will... pretty sure most on here know or hear of 4secondsflat ![](/ubbthreads/images/graemlins/wave.gif) http://www.4secondsflat.com/Spark_plug_reading.html
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Re: Spark plug heat range??
[Re: MR_P_BODY]
#1669699
09/21/14 02:38 AM
09/21/14 02:38 AM
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Joined: Dec 2007
Posts: 12,588 Great Neck,LI,new york
hemi-itis
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Ok,,,,,,,,,,,,,so which chart is correct??????? ![](/ubbthreads/images/graemlins/confused.gif)
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Spark plug heat range??
[Re: hemi-itis]
#1669700
09/21/14 10:21 AM
09/21/14 10:21 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Ok,,,,,,,,,,,,,so which chart is correct???????
I have always done the timing on the ground strap.. I can change timing and in a few runs see the difference on the strap... but this is my OPINION but I have seen the effects EDIT This is who wrote the timing article and the pics for the Wallace site
Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. (I did a copy/paste on the name from the Wallace site ![](/ubbthreads/images/graemlins/wave.gif)
Last edited by MR_P_BODY; 09/21/14 10:25 AM.
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